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  • Institute of Physics  (33,179)
  • PANGAEA  (9,831)
  • 2010-2014  (43,010)
  • 2012  (43,010)
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  • 2010-2014  (43,010)
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  • 1
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    Grain-size analysis and geochemistry of sediment core GeoB13602-1 (2012)
    PANGAEA
    In:  Supplement to: Just, Janna; Heslop, David; von Dobeneck, Tilo; Bickert, Torsten; Dekkers, Mark J; Frederichs, Thomas; Meyer, Inka; Zabel, Matthias (2012): Multi-proxy characterization and budgeting of terrigenous end-members at the NW African continental margin. Geochemistry, Geophysics, Geosystems, 13, Q0AO01, https://doi.org/10.1029/2012GC004148
    Details
    Publication Date: 2024-06-26
    Description: Grain-size, terrigenous element and rock magnetic remanence data of Quaternary marine sediments retrieved at the NW African continental margin off Gambia (gravity core GeoB 13602-1, 13°32.71' N, 17°50.96'W) were jointly analyzed by end-member (EM) unmixing methods to distinguish and budget past terrigenous fluxes. We compare and cross-validate the identified single-parameter EM systems and develop a numerical strategy to calculate associated multi-parameter EM properties. One aeolian and two fluvial EMs were found. The aeolian EM is much coarser than the fluvial EMs and is associated with a lower goethite/hematite ratio, a higher relative concentration of magnetite and lower Al/Si and Fe/K ratios. Accumulation rates and grain sizes of the fluvial sediment appear to be primarily constrained by shore distance (i.e., sea-level fluctuations) and to a lesser extent by changes in hinterland precipitation. High dust fluxes occurred during the Last Glacial Maximum (LGM) and during Heinrich Stadials (HS) while the fluvial input remained unchanged. Our approach reveals that the LGM dust fluxes were ~7 times higher than today's. However, by far the highest dust accumulation occurred during HS 1 (~300 g m**-2 yr** -1), when dust fluxes were ~80 fold higher than today. Such numbers have not yet been reported for NW Africa, and emphasize strikingly different environmental conditions during HSs. They suggest that deflation rate and areal extent of HSs dust sources were much larger due to retreating vegetation covers. Beyond its regional and temporal scope, this study develops new, in principle, generally applicable strategies for multi-method end-member interpretation, validation and flux budgeting calibration.
    Keywords: 409-1; Center for Marine Environmental Sciences; GeoB13602-1; Gravity corer (Kiel type); Maria S. Merian; MARUM; MSM11/2; SL; Southern Senegal
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 2
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    Late Pleistocene sediment record of the Maldives carbonate platform (2012)
    PANGAEA
    In:  Supplement to: Paul, Andreas; Reijmer, John J G; Fürstenau, Jörn; Kinkel, Hanno; Betzler, Christian (2012): Relationship between Late Pleistocene sea-level variations, carbonate platform morphology and aragonite production (Maldives, Indian Ocean). Sedimentology, 59(5), 1640-1658, https://doi.org/10.1111/j.1365-3091.2011.01319.x
    Details
    Publication Date: 2024-06-26
    Description: A piston core from the Maldives carbonate platform was investigated for carbonate mineralogy, grain-size distributions, calcium carbonate content and organic carbon. The sedimentary record was linked to Late Pleistocene sea-level variations, using an age model based on oxygen isotopes obtained from planktonic foramanifera, nannofossil biostratigraphy and 14C age determinations. The correlation between the sedimentary record and Late Pleistocene sea-level showed that variations in aragonite and mud during the past 150 000 years were clearly related to flooding and sea floor exposure of the main lagoons of the atolls of the Maldives carbonate platform. Platform flooding events were characterized by strongly increased deposition of aragonite and mud within the Inner Sea of the Maldives. Exposure events, in contrast, can be recognized by rapid decreases in the values of both proxy records. The results show that sediments on the Maldives carbonate platform contain a continuous record of Pleistocene sea-level variations. These sediments may, therefore, contribute to a better understanding of regional and even global sea-level changes, and yield new insights into the interplay between ocean currents and carbonate platform morphology.
    Keywords: M74/4; M74/4_1096-1; M74/4-1095-KL; Meteor (1986); NEOMA: The Neogene of the Maldives; PC; Piston corer
    Type: Dataset
    Format: application/zip, 5 datasets
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  • 3
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    Pore water data from sediment cores recovered during POSEIDON cruise POS410 (2012)
    PANGAEA
    In:  MARUM - Center for Marine Environmental Sciences, University Bremen
    Details
    Publication Date: 2024-06-26
    Keywords: Center for Marine Environmental Sciences; GC; GeoB15302; GeoB15303; GeoB15307; GeoB15310; GeoB15311; GeoB15312; GeoB15314; GeoB15317; GeoB15321; GeoB15323; GeoB15325; GeoB15326; GeoB15329; GeoB15330; GeoB15331; GeoB15332; GeoB15334; GeoB15335; GeoB15337; GeoB15339; GeoB15340; GeoB15341; GeoB15343; GeoB15344; GeoB15345; GeoB15347; GeoB15348; GeoB15349; GeoB15351; GeoB15352; GeoB15353; GeoB15356; GeoB15357; GeoB15358-3; GeoB15362; GeoB15363; GeoB15369; GeoB15370; Gravity corer; MARUM; MUDFLOW; POS410; POS410_140-1; POS410_141-1; POS410_145-1; POS410_148-1; POS410_149-1; POS410_150-1; POS410_151-1; POS410_154-1; POS410_157-1; POS410_159-1; POS410_160-1; POS410_161-1; POS410_164-1; POS410_165-1; POS410_166-1; POS410_167-1; POS410_168-1; POS410_169-1; POS410_171-1; POS410_172-1; POS410_173-1; POS410_174-1; POS410_175-1; POS410_176-1; POS410_177-1; POS410_178-1; POS410_179-1; POS410_180-1; POS410_181-1; POS410_182-1; POS410_183-1; POS410_185-1; POS410_186-1; POS410_187-2; POS410_190-1; POS410_191-1; POS410_194-1; POS410_195-1; Poseidon
    Type: Dataset
    Format: application/zip, 38 datasets
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  • 4
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    Revised age models and foraminiferal records obtained for the Last Interglacial period in six marine sediment cores (2012)
    PANGAEA
    In:  Supplement to: Govin, Aline; Braconnot, Pascale; Capron, Emilie; Cortijo, Elsa; Duplessy, Jean-Claude; Jansen, Eystein; Labeyrie, Laurent D; Landais, Amaëlle; Marti, O; Michel, Elisabeth; Mosquet, E; Risebrobakken, Bjørg; Swingedouw, Didier; Waelbroeck, Claire (2012): Persistent influence of ice sheet melting on high northern latitude climate during the early Last Interglacial. Climate of the Past, 8, 483-507, https://doi.org/10.5194/cp-8-483-2012
    Details
    Publication Date: 2024-06-26
    Description: The dataset contains the revised age models and foraminiferal records obtained for the Last Interglacial period in six marine sediment cores: - the Southern Ocean core MD02-2488 (age model, sea surface temperatures, benthic d18O and d13C for the period 136-108 ka), - the North Atlantic core MD95-2042 (age model, planktic d18O, benthic d18O and d13C for the period 135-110 ka), - the North Atlantic core ODP 980 (age model, planktic d18O, sea surface temperatures, seawater d18O, benthic d18O and d13C, ice-rafted detritus for the period 135-110 ka), - the North Atlantic core CH69-K09 (age model, planktic d18O, sea surface temperatures, seawater d18O, benthic d18O and d13C, ice-rafted detritus for the period 135-110 ka), - the Norwegian Sea core MD95-2010 (age model, percentage of Neogloboquadrina pachyderma sinistral, sea surface temperatures, benthic d18O, ice-rafted detritus for the period 134-110 ka), - the Labrador Sea core EW9302-JPC2 (age model, percentage of Neogloboquadrina pachyderma sinistral, sea surface temperatures, benthic d18O for the period 134-110 ka).
    Keywords: 162-980; CALYPSO; Calypso Corer; Center for Marine Environmental Sciences; CH69-K09; COMPCORE; Composite Core; EW9302-JPC2; GC; Giant piston corer (Calypso); GPC-C; Gravity corer; IMAGES I; Joides Resolution; JPC; Jumbo Piston Core; Kerguelen Plateau; Labrador Sea; Last Interglacial; Leg162; Marge Ibérique; Marion Dufresne (1995); MARUM; MD02-2488; MD101; MD125; MD 125 / SWIFT BIS-CARHOT; MD952010; MD95-2010; MD952042; MD95-2042; Newfoundland margin; Norwegian Sea; Ocean Drilling Program; ODP; South Atlantic Ocean; Southern Ocean; Voring Plateau
    Type: Dataset
    Format: application/zip, 12 datasets
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  • 5
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    Radiocarbon dating on cold-water corals, grain size, Corg, and benthic foraminfera assemblage of two sediment cores from the Ionian Sea (2012)
    PANGAEA
    Details
    Publication Date: 2024-06-26
    Description: Continuous sedimentary records from an eastern Mediterranean cold-water coral ecosystem thriving in intermediate water depths (~600 m) reveal a temporary extinction of cold-water corals during the Early to Mid Holocene from 11.4-5.9 cal kyr BP. Benthic foraminiferal assemblage analysis shows low-oxygen conditions of 2 ml l**-1 during the same period, compared to bottom-water oxygen values of 4-5 ml l**-1 before and after the coral-free interval. The timing of the corals' demise coincides with the sapropel S1 event, during which the deep eastern Mediterranean basin turned anoxic. Our results show that during the sapropel S1 event low oxygen conditions extended to the rather shallow depths of our study site in the Ionian Sea and caused the cold-water corals temporary extinction. This first evidence for the sensitivity of cold-water corals to low oceanic oxygen contents suggests that the projected expansion of tropical oxygen minimum zones resulting from global change will threaten cold-water coral ecosystems in low latitudes in the same way that ocean acidification will do in the higher latitudes.
    Keywords: Center for Marine Environmental Sciences; GeoB11185-1; GeoB11186-1; Gravity corer (Kiel type); HERMIONE; Hotspot Ecosystem Research and Mans Impact On European Seas; M70/1; M70/1_730; M70/1_731; MARUM; Meteor (1986); Santa Maria di Leuca; SL
    Type: Dataset
    Format: application/zip, 5 datasets
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  • 6
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    Investigations of artificial sediments from two deep-sea in situ recolonization experiments deployed for one year at the central HAUSGARTEN station IV during ARK-XIX/3c (2012)
    PANGAEA
    In:  Supplement to: Freese, Daniela; Schewe, Ingo; Kanzog, Corinna; Soltwedel, Thomas; Klages, Michael (2012): Recolonisation of new habitats by meiobenthic organisms in the deep Arctic Ocean: an experimental approach. Polar Biology, 35(12), 1801-1813, https://doi.org/10.1007/s00300-012-1223-2
    Details
    Publication Date: 2024-06-26
    Description: Commercial exploitation and abrupt changes of the natural conditions may have severe impacts on the Arctic deep-sea ecosystem. The present recolonisation experiment mimicked a situation after a catastrophic disturbance (e.g. by turbidites caused by destabilized continental slopes after methane hydrate decomposition) and investigated if the recolonisation of a deep-sea habitat by meiobenthic organisms is fostered by variations innutrition and/or sediment structure. Two "Sediment Tray Free Vehicles" were deployed for one year in summer 2003 at 2500 m water depth in the Arctic deep-sea in the eastern Fram Strait. The recolonisation trays were filled with different artificial and natural sediment types (glass beads, sand, sediment mixture, pure deep-sea sediment) and were enriched with various types of food (algae, yeast, fish). After one year, meiobenthos abundances and various sediment related environmental parameters were investigated. Foraminifera were generally the most successful group: they dominated all treatments and accounted for about 87% of the total meiobenthos. Colonizing meiobenthos specimens were generally smaller compared to those in the surrounding deep-sea sediment, suggesting an active recolonisation by juveniles. Although experimental treatments with fine-grained, algae-enriched sediment showed abundances closest to natural conditions, the results suggest that food availability was the main determining factor for a successful recolonisation by meiobenthos and the structure of recolonised sediments was shown to have a subordinate influence.
    Keywords: ARK-XIX/3c; Hausgarten; HERMIONE; Hotspot Ecosystem Research and Mans Impact On European Seas; Long-term Investigation at AWI-Hausgarten off Svalbard; North Greenland Sea; Polarstern; PS64; PS64/474-1; PS64/475-1; Sediment tray free vehicle; STFV
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 7
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    Depth profiles of dissolved sulfide and sulfate in the pore water of hydrocarbon seep sediments offshore Pakistan (2012)
    PANGAEA
    In:  Supplement to: Fischer, David; Sahling, Heiko; Nöthen, Kerstin; Bohrmann, Gerhard; Zabel, Matthias; Kasten, Sabine (2012): Interaction between hydrocarbon seepage, chemosynthetic communities, and bottom water redox at cold seeps of the Makran accretionary prism: insights from habitat-specific pore water sampling and modeling. Biogeosciences, 9(6), 2012-2031, https://doi.org/10.5194/bg-9-2013-2012
    Details
    Publication Date: 2024-06-26
    Description: The interaction between fluid seepage, bottom water redox, and chemosynthetic communities was studied at cold seeps across one of the world's largest oxygen minimum zones (OMZ) located at the Makran convergent continental margin. Push cores were obtained from seeps within and below the core-OMZ with a remotely operated vehicle. Extracted sediment pore water was analyzed for sulfide and sulfate concentrations. Depending on oxygen availability in the bottom water, seeps were either colonized by microbial mats or by mats and macrofauna. The latter, including ampharetid polychaetes and vesicomyid clams, occurred in distinct benthic habitats, which were arranged in a concentric fashion around gas orifices. At most sites colonized by microbial mats, hydrogen sulfide was exported into the bottom water. Where macrofauna was widely abundant, hydrogen sulfide was retained within the sediment. Numerical modeling of pore water profiles was performed in order to assess rates of fluid advection and bioirrigation. While the magnitude of upward fluid flow decreased from 11 cm yr**-1 to 〈1 cm yr**-1 and the sulfate/methane transition (SMT) deepened with increasing distance from the central gas orifice, the fluxes of sulfate into the SMT did not significantly differ (6.6-9.3 mol m**-2 yr**-1). Depth-integrated rates of bioirrigation increased from 120 cm yr**-1 in the central habitat, characterized by microbial mats and sparse macrofauna, to 297 cm yr**-1 in the habitat of large and few small vesicomyid clams. These results reveal that chemosynthetic macrofauna inhabiting the outer seep habitats below the core-OMZ efficiently bioirrigate and thus transport sulfate down into the upper 10 to 15 cm of the sediment. In this way the animals deal with the lower upward flux of methane in outer habitats by stimulating rates of anaerobic oxidation of methane (AOM) with sulfate high enough to provide hydrogen sulfide for chemosynthesis. Through bioirrigation, macrofauna engineer their geochemical environment and fuel upward sulfide flux via AOM. Furthermore, due to the introduction of oxygenated bottom water into the sediment via bioirrigation, the depth of the sulfide sink gradually deepens towards outer habitats. We therefore suggest that - in addition to the oxygen levels in the water column, which determine whether macrofaunal communities can develop or not - it is the depth of the SMT and thus of sulfide production that determines which chemosynthetic communities are able to exploit the sulfide at depth. We hypothesize that large vesicomyid clams, by efficiently expanding the sulfate zone down into the sediment, could cut off smaller or less mobile organisms, as e.g. small clams and sulfur bacteria, from the sulfide source.
    Keywords: Center for Marine Environmental Sciences; Flare 1; Flare 15; Flare 2; GeoB12309-3; GeoB12312-3; GeoB12313-12; GeoB12313-13; GeoB12313-6; GeoB12315-4; GeoB12315-9; GeoB12320-4; GeoB12320-9; GeoB12353-3; GeoB12353-5; M74/3; MARUM; Meteor (1986); MUC; MUC-2; MUC-3; MultiCorer; OMZ 650; OMZ 950; Remote operated vehicle QUEST; ROVQ
    Type: Dataset
    Format: application/zip, 11 datasets
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  • 8
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    Paleotemperatures and paleosalinities from the Celtic Margin (Bay of Biscay) (2012)
    PANGAEA
    In:  Supplement to: Eynaud, Frédérique; Malaizé, Bruno; Zaragosi, Sebastien; de Vernal, Anne; Scourse, James D; Pujol, Claude; Cortijo, Elsa; Grousset, Francis E; Penaud, Aurélie; Toucanne, Samuel; Turon, Jean-Louis; Auffret, Gérard A (2012): New constraints on European glacial freshwater releases to the North Atlantic Ocean. Geophysical Research Letters, 39(15), L15601, https://doi.org/10.1029/2012GL052100
    Details
    Publication Date: 2024-06-26
    Description: During the late Quaternary, both external and internal forcings have driven major climatic shifts from glacial to interglacial conditions. Nonlinear climatic steps characterized the transitions leading to these extrema, with intermediate excursions particularly well xpressed in the dynamics of the Northern Hemisphere cryosphere. Here we document the impact of these dynamics on the north-eastern North Atlantic Ocean, focussing on the 35-10 ka interval. Sea-surface salinities have been reconstructed quantitatively based on two independent methods from core MD95-2002, recovered from the northern Bay of Biscay adjacent to the axis of the Manche paleoriver outlet and thus in connection with proximal European ice sheets and glaciers. Quantitative reconstructions deriving from dinocyst and planktonic foraminiferal analyses have been combined within a robust chronology to assess the amplitude and timing of hydrological changes in this region. Our study evidences strong pulsed freshwater discharges which may have impacted the North Atlantic Meridional Overturning Circulation.
    Keywords: CALYPSO; Calypso Corer; Climate Change: Learning from the past climate; IMAGES I; Marion Dufresne (1995); MD101; MD952002; MD95-2002; Meriadzec; Past4Future
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 9
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    Calcium carbonate content in surface sediments and benthic fauna on Antarctic shelves (2012)
    PANGAEA
    In:  Supplement to: Hauck, Judith; Gerdes, Dieter; Hillenbrand, Claus-Dieter; Hoppema, Mario; Kuhn, Gerhard; Nehrke, Gernot; Völker, Christoph; Wolf-Gladrow, Dieter A (2012): Distribution and mineralogy of carbonate sediments on Antarctic shelves. Journal of Marine Systems, 90(1), 77-87, https://doi.org/10.1016/j.jmarsys.2011.09.005
    Details
    Publication Date: 2024-06-26
    Description: We analyzed 214 new core-top samples for their CaCO3 content from shelves all around Antarctica in order to understand their distribution and contribution to the marine carbon cycle. The distribution of sedimentary CaCO3 on the Antarctic shelves is connected to environmental parameters where we considered water depth, width of the shelf, sea-ice coverage and primary production. While CaCO3 contents of surface sediments are usually low, high(〉 15%) CaCO3 contents occur at shallow water depths (150-200 m) on narrow shelves of the eastern Weddell Sea and at a depth range of 600-900 m on the broader and deeper shelves of the Amundsen, Bellingshausen and western Weddell Seas. Regions with high primary production, such as the Ross Sea and the western Antarctic Peninsula region, have generally low CaCO3 contents in the surface sediments. The predominant mineral phase of CaCO3 on the Antarctic shelves is low-magnesium calcite. With respect to ocean acidification, our findings suggest that dissolution of carbonates in Antarctic shelf sediments may be an important negative feedback only after the onset of calcite undersaturation on the Antarctic shelves. Macrozoobenthic CaCO3 standing stocks do not increase the CaCO3 budget significantly as they are two orders of magnitude lower than the budget of the sediments. This first circumpolar compilation of Antarctic shelf carbonate data does not claim to be complete. Future studies are encouraged and needed to fill data gaps especially in the under-sampled southwest Pacific and Indian Ocean sectors of the Southern Ocean.
    Keywords: ANT-III/2; ANT-IX/3; ANT-V/1; ANT-VI/3; ANT-VII/4; ANT-XIII/3; ANT-XIX/5; ANT-XV/3; ANT-XVII/3; ANT-XXI/2; ANT-XXIII/8; BIOACID; Biological Impacts of Ocean Acidification; Drake Passage; Giant box corer; GKG; Haul 1; Haul 10; Haul 11; Haul 12; Haul 20; Haul 22; Haul 23; Haul 24; Haul 25; Haul 26; Haul 27; Haul 28; Haul 29; Haul 30; Haul 31; Haul 33; Haul 35; Haul 36; Haul 37; Haul 38; Haul 4; Haul 5; Haul 6; Haul 8; Haul 9; Kapp Norvegia; Lazarev Sea; MG; MULT; Multiboxcorer; Multiple investigations; Polarstern; PS06; PS06/120-1; PS06/151-7; PS06/158-1; PS06/196-2; PS06/203-2; PS06/207-3; PS06/208-1; PS09/004-2; PS09/010-3; PS09/020-2; PS09/091-6; PS09/115-3; PS09/119-5; PS09/123-5; PS09/126-5; PS09/132-2; PS09/134-3; PS09/136-4; PS09/138-3; PS09/139-3; PS09/140-3; PS09/141-3; PS09/142-4; PS09/143-3; PS09/145-3; PS09/147-3; PS09/148-3; PS09/149-4; PS09/150-1; PS09/151-3; PS09/152-3; PS09/153-3; PS09/154-3; PS09/155-2; PS09 WWSP86 SIBEX; PS12; PS12/266; PS12/298; PS12/305; PS12/308; PS12/314; PS12/323; PS12/333; PS12/342; PS12/344; PS12/346; PS12/348; PS12/354; PS12/362-2; PS12/372; PS12/378; PS12/384; PS12/387; PS12/396; PS12/418; PS12/437; PS12/503; PS12/512-2; PS14/229-1; PS14/235-1; PS14/241-1; PS14/245-1; PS14/248-1; PS14/249-1; PS14/250-11; PS14/250-8; PS14/274-1; PS14/277-1; PS14/292-1; PS14 EPOS I; PS1579-1; PS1589-1; PS1593-1; PS1594-1; PS1597-1; PS1601-1; PS1604-1; PS1608-1; PS1609-1; PS1610-4; PS1611-1; PS1614-1; PS1621-1; PS1624-1; PS1627-1; PS1628-2; PS1629-1; PS1631-1; PS1632-1; PS1641-1; PS18; PS18/127; PS18/129; PS18/135; PS18/162; PS18/165; PS18/171; PS18/173; PS18/175-8; PS18/179-4; PS18/180-5; PS18/189; PS18/212-7; PS18/216; PS18/220-1; PS18/222; PS1995-1; PS1997-2; PS1998-1; PS2016-3; PS2018-1; PS2024-1; PS2026-2; PS2042-2; PS2063-1; PS2068-1; PS39/002-3; PS39/002-4; PS39/002-6; PS39/002-7; PS39/004-9; PS39/005-13; PS39/005-14; PS39/005-15; PS39/005-6; PS39/006-17; PS39/006-19; PS39/006-20; PS39/006-21; PS39/008-4; PS39/008-5; PS39/008-7; PS39/009-10; PS39/009-11; PS39/009-12; PS39/009-6; PS39/009-9; PS39/024-7; PS39/024-8; PS39/025-8; PS39/026-4; PS39 EASIZ; PS48/047; PS48/048; PS48/063; PS48/065-2; PS48/067; PS48/068; PS48/069; PS48/092; PS48/146; PS48/188; PS48/216; PS48/223; PS48/224; PS48/225; PS48/227; PS48/228; PS48/230; PS48/299; PS48/300; PS48/325; PS48/326; PS48/341; PS48/345; PS48 EASIZ II; PS56/090-1; PS56/098-2; PS56/108-1; PS56/112-1; PS56/113-1; PS56/114-1; PS56/120-1; PS56/121-1; PS56/135-6; PS56/137-1; PS56/148-3; PS56/160-2; PS56/161-2; PS56/162-2; PS56/169-1; PS56/176-2; PS56/177-3; PS56/178-1; PS56/179-1; PS56/180-1; PS56/190-2; PS56/190-3; PS56 EASIZ III; PS61/163-1; PS61/176-1; PS61 LAMPOS; PS65/076-1; PS65/077-1; PS65/080-1; PS65/082-1; PS65/084-1; PS65/105-1; PS65/106-1; PS65/116-1; PS65/124-1; PS65/125-1; PS65/183-1; PS65/185-1; PS65/187-1; PS65/197-1; PS65/199-1; PS65/201-1; PS65/202-1; PS65/282-1; PS65/331-1; PS65 BENDEX; PS69; PS69/693-3; PS69/700-1; PS69/701-1; PS69/703-4; PS69/704-1; PS69/706-3; PS69/709-6; PS69/715-3; PS69/718-7; PS69/722-2; PS69/725-4; Scotia Sea, southwest Atlantic; South Atlantic Ocean; South Pacific Ocean; van Veen Grab; VGRAB; Walther Herwig II; Weddell Sea; Weddell Sea, Larsen-A; Weddell Sea, Larsen-B; WH068/1; WH068/1_089; WH068/1_090; WH068/1_096; WH068/1_100; WH068/1_101; WH068/1_102; WH068/1_106; WH068/1_107; WH068/1_114; WH068/1_116; WH068/1_120; WH068/1_133; WH068/1_137; WH068/1_142; WH068/1_143; WH068/1_148; WH068/1_149; WH068/1_154; WH068/1_155; WH068/1_160; WH068/1_161; WH068/1_165; WH068/1_166; WH068/1_171; WH068/2; WH068/2_266; WH068/2_275; WH068/2_278; WH068/2_287; WH068/2_293; WH068/2_311; WH068/2_312; WH068/2_313; WH068/2_319; WH068/2_320; WH113/1, SIBEX-II; WH113/2, SIBEX-II
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 10
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    Geochemistry measured on sediment core GeoB12309-5 (2012)
    PANGAEA
    In:  Supplement to: Wilhelms-Dick, Dorothee; Westerhold, Thomas; Röhl, Ursula; Wilhelms, Frank; Vogt, Christoph; Hanebuth, Till J J; Römmermann, Helge; Kriews, Michael; Kasten, Sabine (2012): A comparison of mm scale resolution techniques for element analysis in sediment cores. Journal of Analytical Atomic Spectrometry, 27(9), 1574-1584, https://doi.org/10.1039/c2ja30148b
    Details
    Publication Date: 2024-06-26
    Description: Laminated sediment records from the oxygen minimum zone in the Arabian Sea offer unique ultrahigh-resolution archives for deciphering climate variability in the Arabian Sea region. Although numerous analytical techniques are available it has become increasingly popular during the past decade to analyze relative variations of sediment cores' chemical signature by non-destructive X-ray fluorescence (XRF) core scanning. We carefully selected an approximately 5 m long sediment core from the northern Arabian Sea (GeoB12309-5: 24°52.3' N; 62°59.9' E, 956 m water depth) for a detailed, comparative study of high-resolution techniques, namely non-destructive XRF core scanning (0.8 mm resolution) and ICP-MS/OES analysis on carefully selected, discrete samples (1 mm resolution). The aim of our study was to more precisely define suitable chemical elements that can be accurately analyzed and to determine which elemental ratios can be interpretated down to sub-millimeter-scale resolutions. Applying the Student's t-test our results show significantly correlating (1% significance level) elemental patterns for all S, Ca, Fe, Zr, Rb, and Sr, as well as the K/Ca, Fe/Ti and Ti/Al ratios that are all related to distinct lithological changes. After careful consideration of all errors for the ICP analysis we further provide respective factors of XRF Core Scanner software error's underestimation by applying Chi-square-tests, which is especially relevant for elements with high count rates. As demonstrated by these new, ultra-high resolution data core scanning has major advantages (high-speed, low costs, few sample preparation steps) and represents an increasingly required alternative over the time consuming, expensive, elaborative, and destructive wet chemical analyses (e.g., by ICP-MS/OES after acid digestions), and meanwhile also provides high-quality data in unprecedented resolution.
    Keywords: GC; GC10; GeoB12309-5; Gravity corer; M74/3; Meteor (1986); OMZ 950
    Type: Dataset
    Format: application/zip, 4 datasets
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