reconstruction of the holocene coastal development at fulong beach in north eastern taiwan using optically stimulated luminescence osl dating abstract the fulong beach coastal area represents a unique feature in taiwan comprising a beach only a few kilometres long and dominated by medium and fine grained quartz rich sand located in the estuary of shuangsi river the area is influenced by fluvial marine and aeolian processes which led to the development of coastal parallel dune ridges and a large sand complex to the south of the river during the holocene the island of taiwan is also influenced by tectonic activity with high uplift rates and a substantial number of earthquakes each year furthermore the subtropical climate and the occurrence of monsoon precipitation as well as typhoon events induce high erosion rates in the coastal zone seventeen samples from five sites were taken for grain size analyses and for optically stimulated luminescence osl dating post ir pulsed blue osl signals were measured to determine the depositional ages of the samples a chronological model of holocene coastal evolution of fulong beach and the main controlling factors was established sediment accumulation at fulong beach was initiated around 5130 360 a under sub aquatic conditions followed by beach deposition at around 3450 240 a the deposition of aeolian sediments started at around 3020 180 a and was interrupted by three depositional hiatuses during which palaeosols formed the dune ridges yielded osl ages between 60 20 and 690 70 a which indicate stabilisation of the morphological system of fulong beach only a few hundred years ago based on the new data the holocene uplift rate is 1 9 mm y for the last 3000 years at fulong beach incorporating the effects of holocene sea level fluctuations

timing of the last interglacial in northern europe derived from optically stimulated luminescence osl dating of a terrestrial saalian eemian weichselian sedimentary sequence in ne germany abstract based on the results of palynological and geochemical analyses a sediment section near the village of vevais north eastern brandenburg is assumed to encompass a succession of saalian eemian and weichselian sediments and is expected to cover a time span from marine isotope stage mis 6 to mis 2 it is regarded as a key site for the study of the last interglacial cycle in north eastern germany palynological analyses had revealed an almost complete record of the eemian mis 5e preserved within a succession of lake marls exposed in the sediment sequence but results from numerical dating methods were still missing within this study five samples from sand layers within the profile have been analyzed using luminescence dating techniques in order to set up a geochronometrical time frame for the eemian interglacial first results from optically stimulated luminescence osl dating of quartz showed severe age underestimation of some samples with regard to their relative stratigraphical position to the eemian lake marls radionuclide analyses revealed disequilibria within the 238u decay chain and inconsistencies concerning the 40k content for most of the samples in order to overcome these dosimetric problems additional infrared stimulated luminescence irsl and post infrared yellow osl post ir yosl measurements from feldspar were conducted and a subtraction dating method was successfully applied hence it was for the first time possible to set up a time frame for the eemian interglacial inferred from luminescence dating techniques of a terrestrial sedimentary archive in north eastern germany the onset of the eemian was dated to 126 16 ka the termination and beginning transition from the eemian to the weichselian cold stage was dated to 108 9 7 8 ka these results are in excellent agreement with the marine isotope record as well as with the results of the analysis of the continuous varve record of lago grande di monticchio with a period of 17 7 0 2 ka from the onset at 127 2 1 6 ka bp for the eemian interglacial

geochronologies and environmental records of quaternary fluvial sequences in the guadalope basin northeast spain based on luminescence dating

middle pleistocene to holocene coastal evolution of nw sardinia mediterranean sea italy abstract the middle pleistocene holocene sardinian stratigraphy has been revised to identify the roles played by sea and climate changes in controlling sedimentation the succession dated through optically stimulated luminescence quartz k feldspar and 14 c the most recent was grouped into eight major stratigraphic units mainly represented by coastal dunes shallow marine and alluvial systems these units range in age from mis 8 300 ka to mis1 6 ka little information is available for the period between mis 8 and 6 the available data however allow some comments on climate changes over the last 125 ka the last interglacial mis 5 is subdivided into five substages e a mis5e eemian is considered the climate optimum of this interglacial sea level was 4 6 m higher than today and climate conditions were warmer and more humid mis 5c is the second high stand peak sea level was about 1 5 m above the modern level and paleoclimatic and paleogeographic conditions were similar to the present during mis 4 at the beginning of the glacial phase a climatic deterioration occurred temperatures dropped by 6c relative to mis 5e in about 5 ka and sea level fell about 60 m this led to a progressive disruption of inland vegetation cover and to repeated valley slope denudation the sea level fall created the accommodation space for fan development in sheltered and cliffed areas where debris flows developed and filled almost completely the terminal parts of the narrow coastal valleys coves in wider areas however coastal dune fields developed contemporaneous presence of alluvial fan and dune systems is associated with the local morphology that could mitigate or amplify moist conditions within a generally arid environment during mis 3 several climate fluctuations occurred wet arid d o h events however the shallow sardinian shelf was continuously sufficiently exposed to become the source area of bioclastic sands these sands were blown inland and formed extensive dunefield systems dunes dominated the west coasts of sardinia under cold and relatively dry conditions in some areas these dunefield systems were eventually almost completely dismantled and reworked into water flow dominated alluvial fans by catastrophic rainfall events thus the local climate quickly switched from arid to humid conditions no record of the last glacial maximum deposits mis 2 was observed along the nw sardinian coast during the holocene transgression mis1 coastal dune systems developed and progressively migrated inland and temperature rose to reach the present day condition

seismogenic stress field beneath the tatun volcano group northern taiwan article i nfo the tatun volcano group tvg represents the main volcanic center in northern taiwan and based on various observations it is considered a potentially active volcano tvg has been monitored since 2003 by a seismic network that consists of eight stations equipped with three component short period and broadband seismometers in this study we use waveform data of high frequency earthquakes in order to investigate the stress field orientation beneath the tvg area the focal mechanisms of 35 selected events have been derived using p wave polarities and amplitude ratios assuming a double couple source these fault plane solutions and various subsamples derived from them were subsequently inverted for the best fitting stress tensor using a linear inversion method the results show stress homogeneity beneath tvg for depths larger than 3 km while the stress tensor is characterized by a subvertical 1 and a subhorizontal nw se trending 3 axis consistent with the regional stress field in northern taiwan on the other hand chihsinshan which is an area of vigorous hydrothermal activity exhibits a localized stress field with horizontal nw se trending 3 axis and ne sw trending horizontal 1 such an axes orientation is likely to be causing opening of microcracks and thus favour the ascent and circulation of fluids in the upper crust shear wave splitting measurements seem to confirm these results showing fast polarization directions along nne ne subparallel to the main fracture system in tvg shear wave anisotropy averages about 2 9 and is probably caused by an anisotropic volume of fluid saturated cracks within the upper 2 5 km of the crust

luminescence dating of sand loess sequences and response of mu us and otindag sand fields north china to climatic changes the sand loess transition zone in north china is sensitive to climate change and is an ideal place to investigate past environmental changes however past climate change at millennial centennial timescales in this region has not been well reconstructed because of limited numerical dating alternations of sandy loam soils with aeolian sand layers in the mu us and otindag sand fields which lie along the sand loess transition zone indicate multiple intervals of dune activity and stability this change is probably a response to variations of the east asian monsoon climate during the late quaternary the single aliquot regeneration sar optically stimulated luminescence osl dating protocol which has been successfully applied to aeolian deposits worldwide is applied to these two sand fields in this study the osl ages provide reliable constraints for reconstruction of past climate changes at suborbital timescale sections in both sand fields contain aeolian sand beds recording millennial scale episodes of dry climate and widespread dune activation including episodes at about the same time as heinrich event 5 and the younger dryas in the north atlantic region these results demonstrate the potential of aeolian sediments in semi arid north china to record millennial scale climatic events and also suggest that dry wet climate variation at the desert margin in china may be linked to climatic change elsewhere in the northern hemisphere through atmospheric circulation this article was published online on 27 november 2008 an error was subsequently identified this notice is included in the online and print versions to indicate that both have been corrected 16 december 2008 copyright 2008 john wiley sons ltd

procedures used for luminescence dating of sediments abstract an account of the procedures for thermoluminescence tl and optically stimulated luminescence osl dating of sediments used at the nordic laboratory for luminescence dating is given the topics discussed include sampling sample preparation separation of quartz and feldspars using heavy liquids dose rate estimation and methods for estimating the equivalent dose special attention is paid to the partial bleach tl technique of mejdahl 1988 which appears to give reliable results for partially bleached sediments optically stimulated luminescence dating using stimulation by infra red ir and green light has been taken up and especially added dose methods using stimulation by ir or green light have been tried with some success some sources of error are discussed including the adverse effect of shallow traps

assessing tectonic and climatic controls for late quaternary fluvial terraces in guide jianzha and xunhua basins along the yellow river on the northeastern tibetan plateau abstract this study focused on well preserved fluvial terrace sequences that span the past 100 ka in the guide jianzha and xunhua basins along the yellow river that drained the northeastern tibetan plateau new geomorphic stratigraphic sedimentologic and chronologic data from twelve depositional sequences within terraces yielded better constraints on rates of incision degradational and aggradational phases for the yellow river age control was established by sixteen osl ages on quartz grains from fluvial sediments three fluvial aggradational phases were identified between 100 and 80 ka 53 and 40 ka and 21 and 12 ka associated with terrace levels respectively at 120 to 95 61 to 45 and 25 to 15 m above river level these aggradational phases reflect multiple processes including enhanced fluvial discharge sediment availability with glaciation deglaciation and increased monsoonal precipitation the initiation of fluvial degradation was linked to mega floods released from landslide dammed lakes at ca 76 38 and 16 ka though these changes may also reflect variations in sediment load discharge relations with climate change the apparent net incision rate is 1 13 0 11 mm yr for the past 100 ka and is consistent with late cenozoic tectonic uplift rates 0 5 2 mm yr and recent gps based rates the fluvial dynamics of the upper reach of the yellow river was variably controlled by climate induced changes in discharge sediment load relations on stadial to interstadial timescales episodic mega floods from the breach of landslide dams and with net incision in the past 100 ka in response to tectonic uplift of the tibetan plateau

variability of lake michigan water level during the past 1000 years reconstructed through optical dating of a coastal strandplain post nipissing phase strandplains of the great lakes reflect late holocene water levels that are linked to climate variability glacial isostasy and changes in basin hydrology this study examines a strandplain sequence at bailey s harbor door county wisconsin along lake michigan which contains a record of water level variations during the past 1000 years following the separation of the lake michigan huron basin from the lake superior basin vibracores are used to define the current elevation of the foreshore facies in 25 preserved beach ridges optical ages for five individual beach ridges are compared with radiocarbon ages on basal peats from nine swales collected in a previous study the optical chronology yields a ridge formation preservation rate of 30 2 yr ridge similar to that of previous assessments this study further demonstrates the efficacy of optical dating for deciphering late holocene beach ridge sequences providing multidecadal resolution lake level meets or exceeds by at least 0 5 m historic metrics at c ad 1125 1225 the maximum water level after c ad 1225 is comparable with that recorded by the instrumental data there is a noticeable high lake level from c ad 1560 to 1725 dating of additional sites along lake michigan is required to establish local rates of glacio isostatic adjustment identify possible erosion of the outlets and to resolve lake level records for individual lakes following the separation of the upper great lakes currently constrained to have occurred c 2400 to 1200 years ago

pleistocene wind system in eastern austria and its impact on landscape evolution abstract during cold periods in the quaternary the intracontinental pannonian basin was part of the european periglacial zone and aeolian erosion had a profound effect in shaping the landscape geomorphologically most effective winds were channelled between the alps and carpathians and entered the pannonian basin from the nw to assess the nature of meteorological conditions producing these winds field studies were carried out in the foreland of the basin entrance in eastern austria as a result we report on the first bedrock ventifacts from austria and aeolian sand occurrence in the bohemian massif through a compilation of published data and field work the distribution of ventifacts was mapped and appears to be controlled primarily by available lithologies palaeo wind directions were identified using mesoforms of bedrock ventifacts especially flutes the acquired air flow directions are accordant with the orientation of erosional landforms on soft sediments and form a coherent system with westerly to north westerly winds in the west which turn towards the entrance of the pannonian basin in the east there are no directions referring to the direct influence of katabatic winds produced on the ice sheet instead the wind system must have been driven by synoptic scale patterns like the polar front the narrow distribution of wind directions suggests that the low altitude air flow system was relatively stable even without a funnelling topography as in the pannonian basin though the alps could have acted to deflect the winds osl data from the bohemian massif indicate aeolian sand movement during the late pleistocene the results provide data for aeolian transport studies among them for loess provenance analyses and can be used as input for climate models

thermoluminescence dating of eemian and early weichselian deposits in denmark abstract eemian and early weichselian deposits from a number of localities in denmark have been dated by thermoluminescence tl the tl ages obtained for eemian deposits are considerably younger than the accepted age of the eemian 120 130 ka possible explanations of the discrepancies are discussed including the possibility that eemian climatic conditions prevailed for a longer time than the 10 ka generally assumed the tl dates for the weichselian deposits together with stratigraphic and morphological evidence indicate the existence of an early weichselian ice advance covering the south eastern part of denmark

late holocene dune migration on the south texas sand sheet abstract there are a wide variety of vegetated eolian depositional landforms associated with the south texas sand sheet attesting to the past dominance of eolian processes mapping identified two sets of parabolic dunes elongating with winds from the southeast and the northwest parabolic dunes elongated by northwesterly winds are older than ca 200 years and may be associated with eolian depositional events ca 2700 and or 2000 years ago the latest dune migration event associated with southeasterly winds occurred ca 200 years ago and at one site is inset into northwesterly extended parabolic dunes this period of dune migration may be coincident with particularly severe drought identified in the tree ring record centered at ad 1790 when the palmer drought severity index was 4 a threshold of dune movement may have occurred ca in the 11th 15th and 20th centuries when there are two or more consecutive years with a palmer drought severity index of

a review of current research on tl dating of loess abstract the thick loess deposits of china central europe and north america are particularly suitable for the application of the thermoluminescence tl dating method because individual grains are likely to have travelled large distances and thus been well exposed to light before deposition wind blown silt grains collected close to glacial rivers in alaska have been shown to give a zero age of not more than 2 ka demonstrating the efficiency of the zeroing mechanism differences in laboratory procedures can cause differences in the tl ages reported particularly for loess over 100 ka tl ages for interstadial soils in europe are in agreement with the very few radiocarbon dates on reliable material such as charcoal on the other hand tl dates from sites in belgium and north western germany indicate that the previously accepted chronology which was based on two radiocarbon dates on humic rich sediments is incorrect the use of the last interglacial palaeosol for assessing the tl dates on loess above and below it is limited by the uncertainty in the timing of termination of soil forming processes 107 and 71 ka are the limits suggested by the astronomically derived time scale results on deposits from china north america alaska and europe are discussed in this context

applications and limitations of thermoluminescence to date quaternary sediments abstract the thermoluminescence tl method dates sediment by quantifying time dependent dosimetric properties of mineral grains sunlight exposure of the sediment during transportation and deposition or heating resets the tl clock to time zero after burial of the mineral grains ionizing radiation from the decay of radioisotopes imparts a tl signal this accumulated tl signal is proportional to the equivalent dose ed which is a measure of radiation exposure during the burial period a tl age estimate is determined from the ratio of the ed to the environmental radiation dose rate the calculation of an ed is influenced by the susceptibility of sediments to optical bleaching the emission spectra of minerals and possible long and short term fading there are three basic methods for determining an ed regeneration total and partial bleach the regeneration technique may yield under estimates because of sensitivity changes with laboratory bleaching the latter two techniques are most useful for well and partially light bleached sediments respectively a number of sediments can be dated by the tl method eolian and a variety of terrestrial sediments yield apparently accurate tl age estimates though there are possible complications associated with pedogenesis it appears that some fluvial sediment can be accurately dated by tl but little is known about the efficiency of optical bleaching for fluvial depositional systems till and glacier proximal deposits are inadequately light bleached to be dated by tl sediments deposited distal from the glacier margin which are at least partially bleached are preferred for dating future research is needed to understand better the relationship between sedimentary environments and the extent of light bleaching also studies should concentrate on dating feldspar extracts from well dated sequences to more fully ascertain the temporal limitations of the method only by understanding the interplay of sedimentology tl dosimetry and environmental radiation can the tl method be effectively applied to the myriad of depositional environments spanning the late to middle pleistocene

deconstructing aeolian landscapes abstract semi stabilized dune systems are important indicators of quaternary drought variability across central north america the south texas sand sheet stss is the southernmost relict dune system on the great plains and is exposed to higher evapotranspiration and moisture variability than similar landscapes farther north in this study a combination of surface and sub surface remote sensing is used to analyze the semi stabilized dune landscapes of the stss in order to delineate distinct aeolian sediments that can represent generations of sedimentation or particular climate conditions the combination of multi resolution analysis of a lidar dataset electromagnetic conductivity surveys and xrf scans of soil cores are shown to be useful tools for deconstructing and modeling the environmental history of the stss optically stimulated luminescence osl dating of identified surfaces suggests that the stss is older than previously thought since dune systems are excellent repositories of climate and biophysical data for a landscape and are also sensitive to changes in climate and ecology the methodology employed in this study can be used to characterize the vulnerability of other similar environments to climate change through the holocene and over the next century

the plateau method for dating partially bleached sediments by thermoluminescence abstract the plateau method for dating sediments that have been incompletely bleached prior to deposition is described by exposing aliquots of a sample to sunlight for different periods of time a range of residual values is obtained and combined with the additive dose or the regeneration technique to yield a series of paleodoses the correct paleodose is taken as that for which the longest plateau in a plot of paleodose vs temperature is obtained

late quaternary eolian sand depositional record for southwestern kansas landscape sensitivity to droughts abstract eolian deposits and landforms are ubiquitous in western kansas particularly south of the arkansas river with the presence of a stabilized dune field stratigraphic studies and associated optical dating reveal a complex depositional history for this dune field spanning the late quaternary the oldest eolian deposits from ca 16 to 12 ka completely or partially bury high terraces with ages of ca 16 and 33 ka it is unknown whether these eolian deposits reflect regional aridity and or a change in sediment availability with the transition of the arkansas river from a single channel to a braided system there is pervasive evidence for episodic eolian erosion and deposition ca 9 8 to 6 3 ka generally coincident with loess deposition on upland surfaces olson c g nettleton w d porter d a brasher b r 1997 middle holocene aeolian activity on the high plains of west central kansas holocene 7 3 255 261 and thus it is inferred to reflect regional aridity sites within the dune field show a sequence of eolian sands and weak buried soils reflecting either dune migration or sand sheet accretion at ca 1490 430 380 320 180 and 70 yr ago which correspond well with continental scale droughts in the tree ring record eolian sand in the arkansas river dune field may be derived principally with variability in fluvial activity and in climate during the late pleistocene to the middle holocene with substantial reactivation of eolian systems during decadal scale drought variability in the past 2000 yr

soil genesis optical dating and geoarchaeological evaluation of two upland alfisol pedons within the tertiary gulf coastal plain abstract much of the gulf coastal plain is mantled by sandy a and e soil horizons overlying finer grained bt horizons researchers have applied optical stimulated luminescence osl dating to a variety of depositional settings such as hillslopes and terraces in an attempt to understand depositional versus pedogenic origins of the sandy horizons and archaeological burial processes these investigations have documented a range of integrity conditions from pristine to highly bioturbated however little work has been conducted in upland summits thus we integrated field morphological descriptions constituent mass balance reconstruction and optical dating to reconstruct the timing and pedogenic pathways of two summit alfisols on the tertiary gulf coastal plain in texas investigations reveal that the sandy a and e horizons and the bt horizons in each pedon are genetically related with textural contrasts resulting from pedogenic processes optical dating revealed highly complex age structures strongly influenced by bioturbation weathering and the presence of coarse clay plus total silt particle sizes pedogenic mixing is extensive in the a and e horizons which effect apparent osl ages

deglaciation chronology sea level changes and environmental changes from holocene lake sediments of germania havn so sabine o northeast greenland abstract germania havn so is located at the outermost coast of northeastern greenland according to radiocarbon dating the lake basin was deglaciated in the early holocene around 11 000 cal yr bp at that time the lake was a marine bay but the lake was isolated soon after deglaciation at 10 600 cal yr bp the marine fauna was species poor indicating harsh conditions with a high sedimentation rate and lowered salinity due to glacial meltwater supply the pioneer vegetation around the lake was dominated by mosses and herbs deposition of relatively coarse sediments during the early holocene indicates erosion of the newly deglaciated terrain remains of the first woody plant salix herbacea appear at 7600 cal yr bp and remains of other woody plants salix arctica dryas octopetala cassiope tetragona and empetrum nigrum appear around one millennium later declining concentrations of d octopetala and the caddis fly apatania zonella in the late holocene probably imply falling summer temperatures only moderate changes in the granulometric and geochemical record during the holocene indicate relatively stable environmental settings in the lake which can probably be explained by its location at the outer coast and the buffering effect of the neighboring ocean

a luminescence dating study of the sediment stratigraphy of the lajia ruins in the upper yellow river valley china abstract pedo sedimentological fieldwork were carried out in the lajia ruins within the guanting basin along the upper yellow river valley in the eolian loess soil sections on the second river terrace in the lajia ruins we find that the land of the qijia culture 4 20 3 95 ka bp are fractured by several sets of earthquake fissures a conglomerated red clay covers the ground of the qijia culture and also fills in the earthquake fissures the clay was deposited by enormous mudflows in association with catastrophic earthquakes and rainstorms the aim of this study is to provide a luminescence chronology of the sediment stratigraphy of the lajia ruins eight samples were taken from an eolian loess soil section xialajia section in the ruins for optically stimulated luminescence osl dating the osl ages are in stratigraphic order and range from 31 94 1 99 ka to 0 76 0 02 ka combined osl and 14c ages with additional stratigraphic correlations a chronological framework is established we conclude that 1 the second terrace of the upper part of yellow river formed 35 00 ka ago which was followed by the accumulation of the eolian loess soil section and 2 the eolian loess soil section is composed of the malan loess of the late last glacial mis 2 and holocene loess soil sequences

thermoluminescence dating of sediments abstract the potential for using the thermoluminescence behaviour of sediments for dating them was first recognized by soviet scientists g v morozov and v n shelkoplyas and for over a decade their tl dates obtained from a variety of sediments have appeared in the soviet literature since 1977 tl sediment dates have been published by six additional groups using a variety of methods in this review we describe the principles of tl dating the various methods used and contrast tl dating of sediments with the now well accepted tl dating of pottery we conclude that while tl dating has the potential to solve many sedimentary problems more fundamental research needs to be carried out before such dates should be accepted a set of criteria for acceptable dates is proposed

optically stimulated luminescence dating of late holocene raised strandplain sequences adjacent to lakes michigan and superior upper peninsula michigan usa this study evaluates the accuracy of optically stimulated luminescence to date well preserved strandline sequences at manistique thompson bay lake michigan and tahquamenon and grand traverse bays lake superior that span the past 4500 yr the single aliquot regeneration sar method is applied to produce absolute ages for littoral and eolian sediments sar ages are compared against ams and conventional 14 c ages on swale organics modern littoral and eolian sediments yield sar ages b100 yr indicating near if not complete solar resetting of luminescence prior to deposition beach ridges that yield sar ages b2000 yr show general agreement with corresponding 14 c ages on swale organics significant variability in 14 c ages n2000 cal yr b p complicates comparison to sar ages at all sites however a sar age of 4280 f 390 yr uic913 on ridge77 at tahquamenon bay is consistent with regional regression from the high lake level of the nipissing ii phase ca 4500 cal yr b p sar ages indicate a decrease in ridge formation rate after 1500 yr ago likely reflecting separation of lake superior from lakes huron and michigan this study shows that sar is a credible alternative to 14 c methods for dating littoral and eolian landforms in great lakes and other coastal strandplains where 14 c methods prove problematic

extraordinary flood events and the response to monsoonal climatic change during the last 3000 years along the middle yangtze river valley china abstract well dated long term flood data series is very important in studying of hydrological response to past climatic change along the mainstream of the yangtze river five palaeoflood events recorded by slackwater deposits were identified by the sedimentological criteria and analytical results a detailed chronological framework of palaeoflood events during the late holocene was established by optically stimulated luminescence dating in combination with anthropogenic remains and with pedo stratigraphic correlations with well dated holocene loess soil profiles within the middle yangtze river basin the five palaeoflood events were dated to 2 43 0 18 ka 1 82 0 17 ka 0 94 0 07 ka 0 72 0 06 ka and 0 59 0 05 ka respectively these results are consistent with geological records at other palaeoflood sites and historical flood records along the middle yangtze river valley a regional synthesis of the palaeoflood chronology over the last 3000 years was compiled along the middle yangtze river extraordinary flood events generally seem to be correlated with late holocene climatic variability i e neoglacial cooling roman warm period dark ages cold period medieval climate anomaly and little ice age the high resolution climatic proxies from stalagmites of the dongge cave and heshang cave ice cores of the grip the total solar irradiance variations and sunspot number and enso activities suggest that these hydroclimatic events are possibly related to the weaker asia summer monsoon and the cooling climatic events as well as the stronger enso activities during the late holocene in the yangtze river valley these results provide insights into the response of hydroclimatic system to global change in the large rivers of asia

on the age of the young morainic morphology in the area ascribed to the maximum extent of the weichselian glaciation in north eastern germany abstract in this case study the first numerical ages from the area ascribed to the maximum extent of the weichselian glaciation in north eastern germany are presented the ages were derived from fluvioglacial sandur sediments of the luckenwalde area using optically stimulated luminescence dating techniques for the dating of quartz the ages reveal a primary formation of the luckenwalde outwash plain in the warthe stage of the saalian glaciation 130 150 ka and a limited reworking of the sediments mainly linked to meltwater activity during the weichselian glaciation due to the insufficient zeroing of the osl signal of the sediments the timing of that event can only be determined by a maximum age of around 35 ka nevertheless this age is in accordance with results from the beelitz outwash cone indicating an ice advance in mis 2 the results of the luminescence measurements are supported by additional stratigraphical and petrographical findings it is likely that a considerable number of landforms attributed to the weichselian glaciation are originally of saalian age only partly overridden by the weichselian glaciation but not reshaped by this process with transformation of the relief mainly linked to meltwater processes this implies a very thin probably warm based ice cover of a fast paced and short lived weichselian ice advance adapting to a pronounced saalian morphology