cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.1594/pangaea.807591
title: Table 2. 14C AMS datings for sediment core T89-24

description: Planktic foraminifera data from three cores of the Angola-Zaire margin are used to reconstruct palaeopositions of the Angola-Benguela Front (ABF) between the warm Angola Current and cold Benguela Current for the last 180,000 years. Strong northward shifts occurred in stages 4 and 3.3-3.1, but not in stages 6 and 2. The Benguela Current did not penetrate into the Gulf of Guinea. The southernmost positions, not far from the present one, were occupied in stages 5.5 and 1, but also in stage 6.3. The record of the shifts contains significant variance in the 23 ky**-1 orbital frequency band and there are indications for a strong 100-ky**-1 frequency component. There is also much variance at 15 ky1, the sum frequency of the 23-ky**-l and the absent 41-ky**-1 cycles. This cyclicity is a real feature in the records.The Benguela Current system performs a combination of two types of precessional (23 ky**-1) movements: shifts of the ABF to the south and north precede swings between more zonal and more meridional directions respectively of the Benguela Oceanic Current by 6.6 ky. The extreme positions of the ABF may be described by the 100-ky**-1 eccentricity component which is also documented in cores from Walvis Ridge and Cape Basin. Both the 23-ky and 100-ky shifts of the ABF are in phase with the meridional movements of the Subtropical Convergence zone (STC) in the southern Indian Ocean, and with advection variations in the equatorial Atlantic. The movements of the STC are probably driven by meridional displacements of the belt of westerly winds over the southern hemisphere. These caused displacements of the circumpolar fronts, the SE trades and the Benguela Current system, and made the cool advection at the equator fluctuate.The northernmost positions of the ABF coincide with strong sea-surface temperature minima in the Arabian Sea and the equatorial Pacific Ocean. These minima are probably the result of increased advection of relatively cool surface water from the south which is also caused by the northward eccentricity-driven movement of the westerlies and the associated oceanic polar fronts.
description: Supplement to: Jansen, J H Fred; Ufkes, Els; Schneider, Ralph R (1996): Late Quaternary movements of the Angola-Benguela front, SE Atlantic, and implications for advection in the equatorial Ocean. In: Wefer, G; Berger, W H; Siedler, G & Webb, D (eds.), The South Atlantic: Present and Past Circulation, Springer, Berlin, Heidelberg, 553-575
DOI: 10.1594/pangaea.921806
title: Radiocarbon measurements on tree rings of tree ZH-600797
DOI: 10.1594/pangaea.803520
title: (Table 2) Comparison of radiometric 40Ar/39Ar datings of tephra layers and biostratigraphic ages from ODP Leg 165 sites
DOI: 10.1594/pangaea.775358
title: (Table 1) K and Ar content, and age determination of ODP Holes 126-792E and 126-793B

description: Results of conventional K-Ar dating on five samples from two sites from the Izu-Bonin forearc are presented. Two samples recovered from a volcanic edifice and overlying sediments drilled on the western side of the forearc basin (Site 792) indicate a basement age of 34 Ma. This is consistent with early Oligocene biostratigraphic ages from the overlying sediments. Three samples from the basement of Hole 793B at the center of the basin are not analytically distinguishable, with a best age of 27.1 +/- 0.6 Ma. This is slightly younger than the 30-33 Ma biostratigraphic and magnetostratigraphic estimates from the overlying sediments, suggesting that alteration processes have lowered the apparent K-Ar ages. These ages suggest that syn-rift volcanism occurred in a forearc location during the middle Oligocene.
description: Supplement to: Taylor, Rex N; Mitchell, John G (1992): K-Ar dating results from whole-rock and mineral separates of the Izu-Bonin Forearc basement, Leg 126. In: Taylor, B; Fujioka, K; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 126, 677-680
DOI: 10.1594/pangaea.778941
title: Table 1 LA-ICPMS zircon U-Pb results for the Kekesai granitoids
DOI: 10.1594/pangaea.921796
title: Radiocarbon measurements on tree rings of tree ALT-B05
DOI: 10.1594/pangaea.785452
title: (Table 2) Uranium and thorium isotopic composition, activity ratios and ages of bivalvia shells in sediment core GIK14350, northern Germany

description: A new chemical procedure for cleaning marine carbonates was applied to remove detritus as well as metaloxide contaminations of marine shells from Eemian deposits and adjoining succession of a sediment core from Dagebüll, Schleswig- Holstein. Hence, one can significantly reduce the contamination with detrital uranium and thorium. Thermal ionisation mass spectrometry was applied to determine the uranium and thorium activities used for 230Th/U dating of these shells. At least ten samples of marine bivalves of five different core sections were analysed. Samples located below a five meter thick clay layer at 19-24 m yielded an average age of 132±18 ka. Shells located above the clays at 15-20 m depth were strongly influenced by percolating groundwaters of an open system. Therefore, a reliable dating of these samples was not possible.
description: Supplement to: Lomitschka, Michael; Frank, Norbert; Mangini, Augusto (1997): Untersuchungen zur Th/U-Datierung eemzeitlicher Muscheln aus Schleswig-Holstein = U-Th dating of eemian bivalves from Schleswig-Holstein. Meyniana, 49, 85-102
DOI: 10.1594/pangaea.807388
title: (Table 2) Radiocarbon ages of lake sediments from Boresø, East Greenland

description: This chapter provides a review of proxy data from a variety of natural archives sampled in the Wollaston Forland region, central Northeast Greenland. The data are used to describe long-term environmental and climatic changes. The focus is on reconstructing the Holocene conditions particularly in the Zackenberg area. In addition, this chapter provides an overview of the archaeological evidence for prehistoric occupation of the region. The Zackenberg area has been covered by the Greenland Ice Sheet several times during the Quaternary. At the Last Glacial Maximum (LGM, about 22,000 years BP), temperatures were much lower than at present, and only very hardy organisms may have survived in the region, even if ice-free areas existed. Marked warming at around 11,700 years BP led to ice recession, and the Zackenberg area was deglaciated in the early Holocene, prior to 10,100 years BP. Rapid early Holocene land emergence was replaced by a slight transgression in the late Holocene.During the Holocene, summer solar insolation decreased in the north. Following deglaciation of the region, summer temperatures probably peaked in the early to mid-Holocene, as indicated by the occurrence of a southern beetle species. However, the timing for the onset of the Holocene thermal maximum is rather poorly constrained because of delayed immigration of key plant species. During the thermal maximum, the mean July temperature was at least 2-3°C higher than at present. Evidence for declining summer temperatures is seen at around 5500, 4500 and 3500 years BP. The cooling culminated during the Little Ice Age that peaked about 100-200 years ago. The first plants that immigrated to the region were herbs and mosses. The first dwarf shrubs arrived in Northeast Greenland prior to 10,400 years BP, and dwarf birch arrived around 8800 years BP. The first people arrived about 4500 years BP, but the region was depopulated several times before the last people disappeared some time after 1823 AD, perhaps as a consequence of poor hunting conditions during the peak of the Little Ice Age.
description: Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150
description: Supplement to: Bennike, Ole; Sørensen, Mikkel; Fredskild, Bent; Jacobsen, Bjarne H; Böcher, Jens; Amsinck, Susanne L; Jeppesen, Erik; Andreasen, Claus; Christiansen, Hanne Hvidtfeldt; Humlum, Ole (2008): Late quaternary environmental and cultural changes in the Wollaston Forland region, Northeast Greenland. Advances in Ecological Research, 40, 45-79
DOI: 10.1594/pangaea.790818
title: (Table) Radiocarbon ages of sediment core K02 in Swamp Dahu, Nanling mountains

description: Humification, in general, is a proxy to describe the degree of decomposition of plant remains. Since the process of decomposition of died plants involves both the local climate and other conditions, so humification can be used to indicate variations of sedimentary environment or paleoclimate. A number of researches have demonstrated that the humification (generally expressed as humification degree, HD) of peat is a useful proxy indicator of past climatic changes, because peat humification is strongly influenced by microorganism activity, conditions of wetness and temperature, pH values of the soil and the type of peat-forming plants, among which the conditions of wetness and temperature are the most important ones. Up to now, almost all the relevant studies concerning the climatic implication of the HD mainly concentrate on the peat deposits, few on the lacustrine or limnological sediments (here refers to sedimentary sequence that is dominated by alternations between the lacustrine and the marshy sediments). However, a recent study points out that for the sediments of Lake Barkol in the extremely arid northeastern Xinjiang, NW China, the HD record can also provide very useful information on Holocene climatic changes. So we think the HD record of limnological sediments has great potentiality for indicating past climatic changes as well. In the paper, we try to test the using of the HD record of a limnological sequence derived in Swamp Dahu to indicate the past climatic changes in South China.
description: Supplement to: Zhong, Wei; Ma, Qiaohong; Xue, Jibin; Zheng, Yanming; Cai, Ying; Ouyang, Yun; Yu, Xuefeng (2011): Humification degree as a proxy climatic record since the last deglaciation derived from a limnological sequence in South China. Geochemistry International, 49(4), 407-414
DOI: 10.1594/pangaea.788536
title: (Table A1) Uranium and Thorium determination from IODP Site 310-M0007B

description: The Integrated Ocean Drilling Program (IODP) Expedition 310 recovered drill cores from the drowned reefs around the island of Tahiti (17°40'S, 149°30'W), many of which contained samples of massive corals from the genus Porites. Herein we report on one well-preserved fossil coral sample: a 13.6 cm long Porites sp. dated by uranium series techniques at 9523 ± 33 years. Monthly delta18O and Sr/Ca determinations reveal nine clear and robust annual cycles. Coral delta18O and Sr/Ca determinations estimate a mean temperature of ca. 24.3°C (ca. 3.2°C colder than modern) for Tahiti at 9.5 ka; however, this estimate is viewed with caution since potential sources of cold bias in coral geochemistry remain to be resolved. The interannual variability in coral delta18O is similar between the 9.5 ka coral record and a modern record from nearby Moorea. The seasonal cycle in coral Sr/Ca is approximately the same or greater in the 9.5 ka coral record than in modern coral records from Tahiti. Paired analysis of coral delta18O and Sr/Ca indicates cold/wet (warm/dry) interannual anomalies, opposite from those observed in the modern instrumental record.
description: (a) delta234U = ([234U/238U]activity -1) * 1000. (b) [230Th/238U]activity = 1 - e(Lambda230T) + (delta234U(measured) / 1000) [Lambda230 / (Lambda230 - Lambda234)](1 - e(-Lambda230 - Lambda234) T), where T is the age. Decay constants are 9.1577 * 10**-6 yr**-1 for 230Th, 2.8263 * 10**-6 yr**-1 for 234U [Cheng et al. (2000) doi:10.1016/S0009-2541(99)00157-6], and 1.55125 * 10**-1010 yr**-1 for 238U [Jaffey et al. (1971), doi:10.1103/PhysRevC.4.1889]. (c) The degree of detrital 230Th contamination is indicated by the [230Th/232Th] atomic ratio instead of the activity ratio.(d) Age corrections were calculated using an estimated atomic 230Th/232Th ratio of 4 ± 4 ppm. (e) delta234U(initial) corrected was calculated based on 230Th age (T), i.e., delta234U(initial = delta234U(measured) * e(Lambda234*T), and T is corrected age.
description: Supplement to: DeLong, Kristine; Quinn, Terrence Michael; Shen, Chuan Chou; Lin, Ke (2010): A snapshot of climate variability at Tahiti at 9.5 ka using a fossil coral from IODP Expedition 310. Geochemistry, Geophysics, Geosystems, 11, 1-14
DOI: 10.1594/pangaea.792846
title: (Table) Radiocarbon datings of sediment core BLK-1 obtained from Barkol Lake, China

description: The Barkol Lake, as a closed inland lake, is located at the northeast Xinjiang in northwest China. A combination of geochemical indicators including d18O and d13C of carbonate, TOC, carbonate contents, as well as grain size proxies and magnetic susceptibility of sediments obtained from a newly recovered section at this lake, provides a high-resolution history of climatic change in the past 9400 years. Multi-indicators reflect that Holocene climatic change in the study region generally follows the Westerly Wind pattern of Holocene, and three climatic periods can be identified. Between 9400 and 7500 cal a B.P., climate was characterized by relatively drier and colder condition. From 7500 to 5800 cal a B.P., a relatively warmer and moister climate prevailed, but between 5800 and 3500 cal a B.P., climate shifted towards warmer and drier conditions. A relatively colder and wetter climate prevailed during 3500~1000 cal a B.P., then it changed towards cold and dry between 1000 and 500 cal a B.P.; after 500 cal a B.P., climate changed towards warm and dry conditions again. This study reflects that during the Middle Holocene (from ca 7000 to 3500 cal a B.P.), variations of carbonate d18O of sediments from several lakes in the northern Xinjiang were synchronous with that of Qinghai Lake, where was strongly influenced by the South Asian monsoon; however, after 3500 cal a B.P. this consistency was interrupted, possibly resulting from a re-domination of the Westerly Wind and the retreat of South Asian monsoon in the northern Xinjiang.
description: Based on a previous study the 'reservoir' effect of Barkol Lake was determined to be 750 years.
description: Supplement to: Zhong, Wei; Xue, Jibin; Li, Xiaodong; Xu, Huajun; Ouyang, Yun (2010): A Holocene climatic record denoted by geochemical indicators from Barkol Lake in the northeastern Xinjiang, NW China. Geochemistry International, 48(8), 792-800
DOI: 10.1594/pangaea.886461
title: Age determination of sediment core FRECHENC, Fréchencourt, France

description: This dataset was archived on 2018-02-19 from the EPD database (http://www.europeanpollendatabase.net).
DOI: 10.1594/pangaea.786082
title: (Table 1) Radiocarbon datings and calendar year calibrations in sediment core MD99-2304, western Svalbard

description: A multi proxy sediment core record on the continental margin off western Svalbard, European Arctic, reflects large climatic and oceanographic oscillations at the Lateglacial-early Holocene transition. Based on studies of planktonic foraminifera, their stable oxygen and carbon isotopic composition and ice rafted debris, we have reconstructed the last 14 cal. ka BP. The period 14-13.5 cal. ka BP was characterized by highly unstable climatic conditions. Short-lived episodes of warming alternated with meltwater pulses and enhanced iceberg rafting. This period correlates to a regional warming of the northern North Atlantic. An overall decrease in meltwater took place during the deglaciation (14-10.8 cal. ka BP). The late Younger Dryas and subsequent transition into the early Holocene is characterized by a reduced flux of planktonic foraminifera and increased iceberg rafting. A major warming took place from 10.8 to 9.7 cal. ka BP, the influence of meltwater ceased and the flux of warm Atlantic Water increased. From 9.7 to 8.8 cal. ka BP, the western Svalbard margin surface waters were significantly warmer than today. This warm period, the thermal maximum, was followed by an abrupt cooling at 8.8. cal. ka BP, caused by an increased influence of Arctic Water from the Arctic Ocean. The results document that the European Arctic was very sensitive to climatic and oceanographic changes at the end of the last glacial and during the Holocene.
description: Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150
description: Supplement to: Ebbesen, Hanne; Hald, Morten; Eplet, Trond Henrik (2007): Late glacial and early Holocene climatic oscillations on the western Svalbard margin, European Arctic. Quaternary Science Reviews, 26(15-16), 1999-2011
DOI: 10.1594/pangaea.785372
title: (Table 1) Thermoluminescence datings of glacial deposits from several sites in Schleswig-Holstein, north Germany

description: First thermoluminescence (TL) datings of glacial deposits from several well-known sites in northwest Germany (Schleswig-Holstein) indicate a possible Middle Weichselian Glaciation in this region. The TL dates obtained imply an ice sheet at about 70-40 ka B.P. here, whose presence in this part of Europe has not been previously considered. The reliability of the TL dates was cross-checked on different lithologies; the dating was performed in two independent laboratories. These dates and their interpretations, however, must still be confirmed both geologically and paleontologically on suitable sites where glacial sediments are sandwiched between Eemian deposits and interstadial deposits older than the Late Weichselian.
description: Supplement to: Marks, Leszek; Piotrowski, Jan A; Stephan, Hans-Jürgen; Fedorowicz, Staniskaw; Butrym, Jerzy (1995): Thermoluminescence indications of the Middle Weichselian (Vistulian) glaciation in northwest Germany. Meyniana, 47, 69-82
DOI: 10.1594/pangaea.769895
title: (Table 2) U and Th isotopic compositions of authigenic carbonates, bottom- and pore water and 230Th/234U ages of authigenic carbonates

description: Notes: All given statistical errors are two standard deviations of the mean (2Sigma). The used decay constants are: Lamda234U = 2.8262 x 10**-6 a**-1 (Cheng et al., 2000b); Lamda238U = 1.55125 x 10**-10 a**-1 (Jaffey et al., 1971); Lamda230Th = 9.158 x 10**-6 a**-1 (Cheng et al., 2000b). Corrections for U and Th chemistry blanks are negligible. Column 2: Subsamples of one carbonate sample are represented by numbers following letters. Samples labeled 'a' and 'b' are different aliquots of the same sample before dissolution. Column 11: The measured 234U/238U activity ratios (delta234U(0)) are presented as deviation permil from the equilibrium value, delta234U(0) = {(234U/238U) x (lamda234/lamda238) - 1} x 1000 (Edwards et al., 1987). Column 13: The decay-corrected 234U/238U activity ratios (delta234U(T)) are calculated from the Th corrected ages (column 10) delta234U(T) = delta234U(0) x e**(lamda234*t) (Edwards et al., 1987). Column 17: Maximum ages are calculated using the equation: (230Th/238U) = 1 - e**(lamda230*t) + [delta234U(0)] - 0.001 x [lamda230/(230Th - lamda234)] x [1 - e((lamda234 - lamda230)*t)]. Column 19: Best age estimate corrected for the effect of detrital Th. The uncertainty on the age correction is deduced from an uncertainty of +-50% on the 230Th/232Th activity ratio of 1.92.
DOI: 10.1594/pangaea.772230
title: (Table S2) Age determinations of Hawaiian-Emperor seamounts

description: Position of the seamounts, except DSDP samples, are estimated. All uncertainties are given at 95% confidence level. Ages were calculated using an age of 28.02 Ma for Fish Canyon sanidine (Renne et al., 1998, doi:10.1016/S0009-2541(97)00159-9), and decay constants and isotopic abundances of (Steiger and Jager, 1977, doi:10.1016/0012-821X(77)90060-7).
DOI: 10.1594/pangaea.712967
title: (Table 1) Age determination and facies log of profile Byzovaya
DOI: 10.1594/pangaea.760025
title: Age determination of sediment core Palm2

description: Core depths are corrected for tephra layers &gt; 1cm thickness and missing modern sediment surfaces through appendix of gravity cores.
DOI: 10.1594/pangaea.762259
title: Radiocarbon age of bottom sediments from the Yenisei Gulf and the Kara Sea

description: Sedimentation rates and bottom sediment ages were determined by 14C method in the Kara Sea and the Yenisei River marginal filter. Age of carbon supplied by the Yenisei River is estimated to be 6.9 ka. As supplied carbon mixes with young biogenic carbon under influence of plankton and benthos young carbon flux (planktogenic) sharply diminishes. This has been inferred from studies of organic matter in sedimentary traps deployed along sections from the Yenisei River mouth to 76°N. The major part (70-80%) of organic carbon in bottom sediments of the Kara and Laptev Seas is ancient (Holocene). Planktogenic part comprises only 20-30%. In the Central Arctic Basin percentage of planktogenic organic matter in bottom sediments is still lower, the major part being associated with supply of ancient terrigenous organic material of low nutritional value for organisms. Determinations of sedimentation rates and recent matter fluxes from sedimentary traps served as a basis for locating a sedimentary depocenter in the Yenisei River both for present time and for geological past. Regularities of variations of sediment matter fluxes in the marginal filter were studied.
description: Supplement to: Lisitzin, Alexander P; Kuptsov, Vladimir M (2003): Recent and ancient sedimentary matter and carbon fluxes in the Yenisei marginal filter and in the Kara Sea. Translated from Okeanologiya, 2003, 43(4), 593-604, Oceanology, 43(4), 561-571
DOI: 10.1594/pangaea.902697
title: (Table S03) Radiocarbon ages from sediment core SU90-03

description: For age dating methods, see references. Calendar ages were calculated from the published raw radiocarbon ages into calendar ages using using Oxcal (online version 4.3) (Ramsey, 2009), the IntCal13 calibration curve (Reimer et al., 2013) and the modern reservoir age corresponding to each location extracted from GLODAP (Key et al., 2004). The reservoir age considered is 400 ± 100 a.