cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.1594/pangaea.55819
title: Distribution of the main heavy minerals identified in sediment core CRP-2/2A

description: Heavy minerals from the lower Oligocene to Quaternary sediments of the CRP-2/2A drill core have been analysed in order to characterize the mineralogical composition of the sediments and to reconstruct their source areas.In the heavy mineral spectrum, pyroxenes up to 90 % predominate. Hornblende, stable heavy minerals (zircon, garnet, epidote, titanite and apatite), opaque and altered minerals are quantitatively minor. Also titanaugite and glass occur in minor amounts. The distribution of heavy minerals throughout the entire sediment core CRP-2/2A points to a mixed source area in the Transantarctic Mountains.According to down-core distribution patterns of heavy minerals, the sediments of CRP-2/2A can be subdivided in two larger units. From 624 to ca. 270 mbsf the sediments are characterized by heavy minerals derived from source rocks in the Transantarctic Mountains, like Granite Harbour intrusive complex, Ferrar Group and Beacon Supergroup. From 270 m to top of core, an additional volcanic component, represented by titanaugite and glass, occurs in the sediments. The fluctuating influence of different source areas within the Transantarctic Mountains is shown by the existence or absence of individual minerals such as biotite and brown hornblende.
description: Supplement to: Polozek, Kerstin (2000): Distribution of heavy minerals in CRP-2/2a, Victoria Land Basin, Antarctica. Terra Antartica, 7(4), 567-573
DOI: 10.1594/pangaea.55535
title: GISP2 Ions: Shallow (B) Core (Detailed)

description: GISP2 major ion concentrations in parts per billion (ppb) by mass. Blanks in the H2O2 data indicate samples that were not analyzed. Blanks in other chemical species represent samples below detection limits. Firn samples were cleaned in the freezer by hand-scraping and placed in a pre-cleaned container. The pieces were kept frozen until analyzed. Samples below 60 meters were cleaned by rinsing with pure (milli-Q) water immediately prior to melting, also in a pre-cleaned container. The data has not been edited to remove possibly contaminated samples.
DOI: 10.1594/pangaea.56074
title: GISP2 Volcanic markers

description: Volcanic sulfate record on Meese/Sowers timescale. Each sample is approximately bi-annual for the last ~12,000 years with a consistent increase in the time covered by each sample to around 50 years/sample at 110,000 years ago. The volcanic sulfate record is derived by applying an empirical orthogonal function (EOF) analysis on the entire glaciochemical time series (Mayewski et al., 1997a). EOF5 was found to explain 12% of the variance in the sulfate record, but it did not significantly explain the variance in any other chemical species. The excellent correlation in the EOF time series and the volcanic sulfate record for the last 9000 years, based on sulfate residuals over a robust spline (Zielinski et al.,1994a) indicates that EOF5 is an indicator of volcanic sulfate deposition over the last 110 kyr.
DOI: 10.1594/pangaea.56075
title: GISP2 accumulation rate history

description: Accumulation rate values were calculated de-straining the depth-age scale of Meese, Sowers, et al. 3 Versions correspond to 3 different ice dynamics situations, as described in Cuffey and Clow (1997). Each one assumes a different value for the retreat distance of the ice sheet margin during the deglaciation.
DOI: 10.1594/pangaea.56081
title: GISP2 CO2 concentrations

description: Average CO2 concentrations of air extracted from depths spanning two separate stadials (cold periods) centered at approximately 46 kyBP and 63 kyBP. Measurements made on 6-8 cm**3 of carefully trimmed ice using a dry extraction method. 3 samples were analyzed for each point.
DOI: 10.1594/pangaea.52727
title: Age model and sedimentation rate of core M174/KL11 (Table 1)

description: Stable isotope and faunal records from the central Red Sea show high-amplitude oscillations for the past 380,000 years. Positive delta18O anomalies indicate periods of significant salt buildup during periods of lowered sea level when water mass exchange with the Arabian Sea was reduced due to a reduced geometry of the Bab el Mandeb Strait. Salinities as high as 53 per mil and 55 per mil are inferred from pteropod and benthic foraminifera delta18O, respectively, for the last glacial maximum. During this period all planktonic foraminifera vanished from this part of the Red Sea. Environmental conditions improved rapidly after 13 ka as salinities decreased due to rising sea level. The foraminiferal fauna started to reappear and was fully reestablished between 9 ka and 8 ka. Spectral analysis of the planktonic delta18O record documents highest variance in the orbital eccentricity, obliquity, and precession bands, indicating a dominant influence of climatically - driven sea level change on environmental conditions in the Red Sea. Variance in the precession band is enhanced compared to the global mean marine climate record (SPECMAP), suggesting an additional influence of the Indian monsoon system on Red Sea climates.
description: Supplement to: Hemleben, Christoph; Meischner, Dieter; Zahn, Rainer; Almogi-Labin, Ahuva; Erlenkeuser, Helmut; Hiller, Birgit (1996): Three hundred eighty thousand year long stable isotope and faunal records from the Red Sea: Influence of global sea level change on hydrography. Paleoceanography, 11(2), 147-156
DOI: 10.1594/pangaea.52742
title: Geochemical analysis of sediment profile HAE6 from Hämelsee
DOI: 10.1594/pangaea.52763
title: Varve analysis of sediment profile HAE6 from Hämelsee
DOI: 10.1594/pangaea.52764
title: Age model of sediment profile HAE9 from Hämelsee
DOI: 10.1594/pangaea.54619
title: Physical properties of sediment core CRP-1

description: The relationship between whole-core compressional wave velocities and gamma-ray attenuation porosities of sediments cored at CRP-1 is examined and compared with results from core-plug samples and global models. Both core-plug and whole-core velocities show a strong dependence on porosity: this relationship appears to be independent of lithology. In the range from 0.1 to 0.4 of fractional porosity (Miocene strata), plug velocities are generally 0.2 - 0.5 km s-1 higher than whole-core velocities. Possible reasons include decreased rigidity in the whole core and diagenetic changes in the plugs. Possibly both velocity measurements are correct but neither is fully representative for in situ conditions. It appears that the core-plug results are more compatible with data from other regions than the whole-core data. After removing first-order compaction control from the whole-core porosity record, a second-order control by clay content can be quantified as a simple positive linear regression (R=0.6). In contrast, after correction for first-order control, porosity and velocity are not significantly influenced by lonestone abundance except for rare, very large lonestones.
description: Supplement to: Niessen, Frank; Jarrard, Richard D (1998): Velocity and porosity of sediments from CRP-1 drillhole, Ross Sea, Antarctica. Terra Antartica, 5(3), 311-318
DOI: 10.1594/pangaea.54627
title: Clay mineralogy of sediment core CRP-1

description: Clay mineral assemblages in lower Miocene and Quaternary sediments recovered at the CRP-1 drillsite, McMurdo Sound shelf, Antarctica, were analysed in order to reconstruct source areas of the sediments and late Cenozoic Antarctic icedynamics. The assemblages are dominated by smectite, illite and chlorite. Kaolinite occurs in trace amounts only. The lower part of the drillcore, below c. 70 mbsf, is characterised by high illite and chlorite, but low smectite concentrations. This assemblage is typical of a source consisting mainly of granitic and metamorphic rocks, such as are widespread in the Transantarctic Mountains and on the East Antarctic craton. In contrast, the upper c. 70 mbsf of the core is characterised by three intervals with high smectite, but low illite and chlorite concentrations at around 59, 45 and 33 mbsf. The smectite-rich assemblage is typical of a hinterland composed of volcanic rocks, such as are found in the region of the present-day Ross Ice Shelf. The clay minerals are mainly detrital and therefore document the changing influence of different source areas through time. Correlation of the clay mineral record of CRP-1 with that of the CIROS-1 and MSSTS-1 cores implies that the oldest sediments at CRP-1 are younger than 21.8 Ma, and that there is no overlap between CRP-l and the other cores.
description: Supplement to: Ehrmann, Werner (1998): Lower Miocene and Quaternary clay mineral assemblages from CRP-1. Terra Antartica, 5(3), 613-619
DOI: 10.1594/pangaea.54628
title: Mineralogy of sediment core CRP-1

description: The mineralogy of the lower Miocene and Quaternary sediments of the drillcore CRP-1 (McMurdo Sound, Ross Sea, Antarctica) has been analysed using the X-ray diffraction method. Quartz, plagioclase feldspars, K-feldspars are the most important non-clay minerals. Amphiboles occur throughout the core in minor amounts. The composition of the sediments points to an origin in the Transantarctic Mountains for the majority of the detrital components. There, the plutonic and metamorphic rocks of the basement, the sediments of the Beacon Supergroup and the volcanic rocks of the Ferrar Dolerite could serve as possible source lithologies. The quartz abundance is strongly linked to the gain size of the sediments with maxima correlating with coarse gain sizes. The downcore distribution of the other detrital minerals is relatively invariable, and does not indicate a major change in the source area during the time represented by the CRP-1 sediments. Some diagenetic alteration of the sediments is indicated by the occurrence of minor amounts of opal-CT and by some clinoptilolite below110 m depth.
description: Supplement to: Ehrmann, Werner (1998): Mineralogy of sediments from CRP-1 as revealed by X-ray diffraction. Terra Antartica, 5(3), 627-632
DOI: 10.1594/pangaea.52331
title: (Fig. 10) Age model of DSDP Hole 90-587
DOI: 10.1594/pangaea.54629
title: Mineral assemblage of basement clasts of sediment core CRP-1

description: Heavy minerals from the lower Miocene and Quaternary sediments of the CRP-1 drillcore have been investigated in order to characterise the mineralogical composition of the sediments and to reconstruct their source areas. The sediments are dominated by very high concentrations of pyroxenes. Hornblende, stable heavy minerals (zircon, garnet, epidote. titanite and apatite), opaque and altered minerals are quantitatively minor. The downcore distribution of the pyroxenes indicates 5 cycles. Each cycle starts with diamictites and proximal glacimarine sediments containing maximum concentrations of pyroxenes of up to 80% in the heavy mineral fraction, and grades into distal glacimarine sediments, with a lower pyroxene content. The heavy minerals indicate a mixed source for all CRP-1 sediments. The proximal sediments consist mainly of minerals derived from a crystalline basement and clastic sedimentary rocks, such as are widespread in the Transantarctic Mountains. However, they also contain a minor component derived from volcanic rocks. The distal sediments, in contrast, are dominated by a volcanic source, which was probably situated to the south of the drillsite, in the region of the present-day Ross Ice Shelf.
description: Supplement to: Polozek, Kerstin; Ehrmann, Werner (1998): Distribution of heavy minerals in CRP-1. Terra Antartica, 5(3), 633-638
DOI: 10.1594/pangaea.53548
title: Grain size analysis on core plugs of sediment core CRP-1 (Table 1, 2)

description: Twenty four core samples from CRP-1, seven from Quaternary strata (20-43.55 meters below sea floor or mbsf) and seventeen from early Miocene strata (43.55 to 147.69 mbsf), have been analysed for their grain-size distribution using standard sieve and Sedigraph techniques. The results are in good agreement with estimates of texture made as part of the visual core description for the 1 :20 core logs for CRP-1 (Cape Roberts Science Team, 1998). Interpretation of the analyses presented here takes into account the likely setting of the site in Quaternary times as it is today, with CRP-1 high on the landward flank of a well-defined submarine ridge rising several hundred metres above basins on either side. In contrast, seismic geometries for strata deposited in early Miocene times indicate a generally planar sea floor dipping gently seaward. Fossils from these strata indicate shallow water depths (&lt; 100 m), indicating the possibility that waves and tidal currents may have influenced sea floor sediments. The sediments analysed here are considered in terms of 3 textural facies: diamict, mud (silt and clay) and sand. Most of the Quaternary section but only 30% of the early Miocene section is diamict, a poorly sorted mixture of sand and mud with scattered clasts, indicating little wave or current influence on its texture. Although not definitive, diamict textures and other features suggest that the sediment originated as basal glacial debris but has been subsequently modified by minor winnowing, consistent with the field interpretation of this facies as ice-proximal and distal glaciomarine sediment. Sediments deposited directly from glacier ice appear to be lacking. Mud facies sediments, which comprise only 10% of the Quaternary section but a third of the early Miocene section, were deposited below wave base and largely from suspension, and show features (described elsewhere in this volume) indicative of the influence of both glacial and sediment gravity flow processes. Sand facies sediments have a considerable proportion of mud, normally more than 20%, but a well-sorted fine-very fine sand fraction. In the context of the early Miocene coastal setting we interpret these sediments as shoreface sands close to wave base.
description: Supplement to: de Santis, Laura; Barrett, Peter J (1998): Grain size analysis of samples from CRP-1. Terra Antartica, 5(3), 375-382
DOI: 10.1594/pangaea.54717
title: Porosity and sound velocity measured in sediment core CIROS-1

description: The CIROS-1 drillhole, which in 1986 reached a depth of 700 m below the seafloor, is still the only deep hole that can provide information on the velocity structure of the upper crust in McMurdo Sound and the Ross Sea, Antarctica. A careful review and quality control of the downhole logging data of CIROS-1 resulted in a new porosity depth function that is consistent with porosity data from the MSSTS-1 and CRP-1 drillholes. Using existing porosity-velocity equations, it was possible for the first time to obtain reliable velocity information for the upper 700 m of strata off the Victoria Land coast. The calculated synthetic seismograms, based on downhole velocity and density data, fit very well with the existing seismic lines IT90A-71, PD90-12, and NBP9601-89. The quality of the correlation confirms that the average velocity of the top 700 m of strata is about 2 000-2 300 m/s, and not 2 800-3 000 m/s, as was previously assumed. In consequence, these distinctly lower velocities result in shallower depths for the seismic unconformities V3/V4 andV4/V5 and thus may have important implications for further drilling off Cape Roberts.
description: Supplement to: Bücker, Christian J; Henrys, Stuart A; Wonik, Thomas (1998): Revision of the Cenozoic seismic velocity structure of the CIROS-1 drillhole, Antarctica, and implications for further drilling off Cape Roberts. Terra Antartica, 5(3), 281-289
DOI: 10.1594/pangaea.54721
title: Carbonate microprobe data of sediment core CRP-1 (Table 2)
DOI: 10.1594/pangaea.54730
title: Analytical results of 19 amino acid analyses from Unit 3.1 of sediment core CRP-1 (Table 1)

description: Amino acid-based geochronological analyses were carried out on fossil mollusc shell and foraminifera from Unit 3.1, Cape Roberts Project core CRP-1. Ratios of D-alloIsoleucine to L-Isoleucine (D/L) were measured from 19 fossil samples using cation exchange High Performance Liquid Chromatography (HPLC) methods. Preliminary interpretation of these results suggest that Unit 3.1 contains carbonate fossils having multiple ages. The interpreted ages have a bimodal distribution between ~220 Ka (Quaternary) and ~2.4 Ma (Pliocene). However, these results lack a comprehensive regional and taxonomic context for amino acid studies in Antarctica and therefore should be regarded as preliminary age estimates of fossil shell ages.
description: Supplement to: Hart, Charles P; Webb, Peter-Noel (1998): Amino acid based geochronology of unit 3.1 (Quaternary), CRP-1, Victoria Land Basin, Antarctica. Terra Antartica, 5(3), 697-701
DOI: 10.1594/pangaea.52345
title: (Table 2) Geochemistry and acculumation rates of DSDP Hole 62-463

description: Age based on nannofossil biostratigraphy by Worsley for this study, documented in Chaboudy (1984)
DOI: 10.1594/pangaea.52654
title: (Table 2) Age model of DSDP Hole 30-289
DOI: 10.1594/pangaea.54558
title: GRIP c-axis orientations

description: Average horizontal and vertical crystal diameters, obtained by linear-intercept measurements on thin sections. Data not corrected for sectioning effect. Depth is midpoint.
DOI: 10.1594/pangaea.54561
title: GRIP Basal Ice: Debris Content

description: Depth is midpoint
DOI: 10.1594/pangaea.54562
title: GRIP Ice Fabric

description: 36 fabric diagrams. Each data point consists of azimuth of c-axis (0-360 deg), and inclination (0-90 deg), with 0 deg=horizontal c-axis and 90 deg=vertical c-axis. The measured inclination represent a projection into the lower hemisphere of a Schmidt net, and have been refraction corrected according to the recommendations of Kamb (1962).
DOI: 10.1594/pangaea.54564
title: GRIP Carbon Dioxide measured by gas chromatography

description: Measurements of CO2 concentration have been made on samples of about 40 g or 3 cm height. Some depth were measured several times.
DOI: 10.1594/pangaea.52653
title: (Table 3) Geochemistry of ODP Hole 121-754A

description: Sc concentrations have been rounded off for presentation, but not for calculating Mn/Sc ratios
DOI: 10.1594/pangaea.52695
title: (Table 3) Age model of DSDP Site 68-502
DOI: 10.1594/pangaea.52608
title: (Table 1) Age model of ODP Hole 114-704A
DOI: 10.1594/pangaea.52701
title: (Table 6) TOC, metal elements of sediment core RC13-229
DOI: 10.1594/pangaea.53178
title: Age model of ODP Site 113-697 (Table 2)

description: We examined diatom preservation patterns in Pliocene age sediments of Jane Basin (ODP Site 697) and compared them with diatom distribution in more northerly sites at various sectors of the Southern Ocean. Our data from Site 697, as well as other sites from around the Southern Ocean, support the view that there was significant ice growth on Antarctica during the late Pliocene. DSDP Site 514 in the Atlantic sector shows increased relative abundance of Eucampia antarctica, an ice-related form, in the upper part of the Gauss Chron with a larger increase just above it. With one exception, all sites included in the present study show increased relative abundance of E. antarctica in the upper part of the Gauss. Our view that there was ice growth on Antarctica during the late Gauss Chron is supported by the results from ODP Site 697. While diatoms are present and percent opal is high in the early and middle Gauss Chron (suggesting more open-ocean conditions), late Gauss sediments contain low percentages of opal and few or no diatoms. This is also true for the early Matuyama Chron. If we accept spring and summer sea-ice cover as the major suppressant of diatom productivity in the Southern Ocean, then we conclude that sea-ice covered the region around Site 697 through much of the year during this interval. Further, the absence of diatoms and the low percentages of opal in middle and late Matuyama chron sediments suggests increased sea-ice cover over the Jane Basin during this time. Although warmer openocean intervals are inferred for intervals near the Olduvai and Jaramillo Subchrons, most of the Matuyama Chron was marked by extensive sea-ice cover with low seasonal contrast. Our results for the early part of the Brunhes Chron are similar, at least for the Jane Basin. During this time, sea-ice cover over the basin apparently extended well into the growing season. In contrast, the later Brunhes Chron is marked by alternating open water (during the growing season) and extensive, almost year-round, sea-ice.
description: Supplement to: Burckle, Lloyd H; Gersonde, Rainer; Abrams, Nelson (1990): Late Pliocene-Pleistocene paleoclimate in the Jane Basin region: ODP Site 697. In: Barker, PF; Kennett, JP; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 113, 803-812
DOI: 10.1594/pangaea.114688
title: Particulate silica of the OUT-patch defined iron-fertilized area of trap T11-13_JA
DOI: 10.1594/pangaea.52255
title: Age model of DSDP Hole 73-522 (Table 1)

description: Paleoceanographic changes during the Oligocene in the South Atlantic have been examined using paleomagnetic, rock magnetic, carbonate content, and sediment accumulation rate (SAR) data. We show that magnetic susceptibility (MS) is largely controlled by carbonate content at Deep-Sea Drilling Project site 522, which in turn is the primary control on SAR at the site. Over 5000 MS measurements were averaged over magnetostratigraphic polarity intervals for use as indicators of carbonate content and SAR proxies. The study produced three primary results: (1) a spectral analysis of the MS data from one upper Oligocene core reveals two dominant periodicities (44.7 +/- 10.4 kyr and 26.4 +/- 3.6 kyr) which approximate Milankovitch obliquity (41 kyr) and precession (23 kyr) periods: (2) four pulses of increased SAR lasting 1 to 2 m.y. punctuate the section, implying longer-term climatic changes (these events are also seen in the Contessa quarry section of the Italian (Tethyan) Oligocene); and (3) two of the SAR maxima correspond to times of global cooling and possible ice volume increases, at 31 and 36 Ma.
description: Supplement to: Mead, Gregory; Tauxe, Lisa; LaBrecque, John L (1986): Oligocene paleoceanography of the South Atlantic: paleoclimatic implications of sediment accumulation rates and magnetic susceptibility measurements. Paleoceanography, 1(3), 273-284
DOI: 10.1594/pangaea.114689
title: Particulate silica of the iron-fertilized area of trap T0-2
DOI: 10.1594/pangaea.50164
title: (Table 1) Calcium carbonate and organic carbon in surface sediments of the Norwegian Sea
DOI: 10.1594/pangaea.124165
title: Beam attenuation and transmissometer data from upcast at station TT011_9-MULVFS24
DOI: 10.1594/pangaea.136726
title: Dissolved iron from bottles at station ANTARES-III_KER01
DOI: 10.1594/pangaea.136727
title: Dissolved iron from bottles at station ANTARES-III_KER02
DOI: 10.1594/pangaea.186825
title: Vertical distributions phytoplankton pigments at station FLUPAC_081
DOI: 10.1594/pangaea.131634
title: Chemical composition of 10% HCl leachable fraction of Barents Sea sediments from the drill core BAVENITE-161
DOI: 10.1594/pangaea.131652
title: Composition of water extracts from Barents Sea sediments of the drill core BAVENITE-161
DOI: 10.1594/pangaea.131635
title: Chemical composition of 10% HCl leachable fraction of Barents Sea sediments from the drill core BAVENITE-172
DOI: 10.1594/pangaea.131636
title: Chemical composition of 10% HCl leachable fraction of Barents Sea sediments from the drill core BAVENITE-189
DOI: 10.1594/pangaea.141139
title: Geochemical analyses of interstitial water from Well A
DOI: 10.1594/pangaea.141140
title: Geochemical analyses of interstitial water from Well B
DOI: 10.1594/pangaea.141299
title: Distribution of Calanus finmarchicus on the Voering Plateau
DOI: 10.1594/pangaea.141228
title: Wet bulk density of pilot core to CON01-603-2 (CONTINENT Ridge) measured by GRAPE density
DOI: 10.1594/pangaea.143504
title: Documentation of sediment core MD96-2087BC
DOI: 10.1594/pangaea.186848
title: Net zooplankton at station FLUPAC_003
DOI: 10.1594/pangaea.142119
title: (Table T4) Spectral reflectance data, ODP Hole 178-1095C
DOI: 10.1594/pangaea.187016
title: Phytoplankton abundance at station FLUPAC_111