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  • PANGAEA  (229)
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  • 1
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    Solid phase geochemistry of sediments from ROV push cores during Pourquoi Pas ? cruise INDEX2016, Hydrothermal Vent Outlet in the Kairei Field (2021)
    PANGAEA
    Details
    Publikationsdatum: 2023-04-24
    Beschreibung: Deep-sea sediment samples were taken from the (wider) Kairei hydrothermal field area (25°S, 70°E) as well as a remote site (26°S, 71°E) in the Indian Ocean during the INDEX cruise 2016 with the N/O Pourquoi pas? (Ifremer, France). Push core samples from different areas of the Kairei vent field, as well as a sample from the remote site (~200 km south-east from the Kairei), were recovered with the help of the ROV VICTOR 6000 (Ifremer, France). All subsampling steps were carried out shipboard at 4 °C. With sterile syringes (nozzles removed) 3 ml of 2 cm layers of sediment were transferred into sterile falcon tubes for DNA extraction and stored at –80 °C. The remaining sediment was cut into 2 cm slices, freeze-dried, and partially milled to 〈75 mm for geochemical analyses. The sediment was analyzed for carbon chemistry, i.e. total organic carbon (TOC) and total inorganic carbon (TIC) with routine standard methods (IR-detection after combustion, ISO 10694, LECO CS 230 analyzer). Elemental composition of Kairei sediments was estimated by the accredited Actlab Laboratories, Canada (Multimethod mix called Ultratrace 3 program, using INAA, 4-Acid Digestion, ICP-OES, and ICP-MS). Sediments from the remote station were analyzed by routine WD-XRF after fusion with Li-Metaborate/Li-Bromide (XRF spectrometers Philips PW 2400 und Philips PW 1480).
    Schlagwort(e): 16S rRNA gene tags; Aluminium oxide; Area/locality; Calcium oxide; Carbon, carbonate; Carbon, organic; Carbon, total; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Element Analyser CS, LECO CS 230; Event label; geochemistry of porewaters; hydrothermal vent; INDEX2016; INDEX2016_12ROV; INDEX2016_20ROV; Indian Ocean; Iron oxide, Fe2O3; Kairei field; Magnesium oxide; Manganese oxide; metalliferous sediments; Phosphorus pentoxide; Potassium oxide; Pourquoi Pas ? (2005); Sample code/label; Silicon dioxide; Sodium oxide; Sulfur, total; Titanium dioxide; VICTOR; Victor6000 ROV
    Materialart: Dataset
    Format: text/tab-separated-values, 628 data points
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    DATA PANGAEA
  • 2
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    A reference section through fast-spread lower oceanic crust, Wadi Gideah, Samail Ophiolite (Sultanate of Oman): Petrographic Data Table and Mineral analyses performed by EPMA (2021)
    PANGAEA
    Details
    Publikationsdatum: 2023-01-13
    Beschreibung: In the absence of a complete profile through fast-spreading modern oceanic crust, we established a reference profile through the paleo crust of the Samail Ophiolite (Sultanate of Oman), which is regarded as the best analogue for fast-spreading oceanic crust on land. To establish a coherent data set, we sampled hard rocks in the Wadi Gideah in the Wadi-Tayin massif from the mantle section up to the sheeted dikes. This paper reports our studies of the lower crust, a 5 km thick pile of gabbros, focusing on petrographic features and on the results of mineral analyses. We collected petrographical data from thins sections of the samples by optical microscope and performed also EPMA analyses (Electron Probe Microanalysis) of the mineral phases of the rocks. The samples have been collected during field campaigns from 2010 to 2015, and the data have been collected in a period from 2013 to 2021.
    Schlagwort(e): Electronprobe Microanalysis; Fast-spreading oceanic crust; gabbro; Mineral Analyses; Oman Ophiolite; Petrographic Data; Samail Ophiolite
    Materialart: Dataset
    Format: application/zip, 3 datasets
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  • 3
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    26.000 - year-long oxygen isotope (G. ruber w.) and Mg/Ca-based estimates of SST analyzed in marine sediment cores from the Mozambique Channel (2021)
    PANGAEA
    Details
    Publikationsdatum: 2023-01-30
    Beschreibung: The Mozambique Channel is a conduit of trade wind-driven throughflow that is a key component of the Agulhas Current and Agulhas leakage, a flux of warm and salty water from the tropical Indo-Pacific to the Atlantic Ocean. Agulhas leakage is thought to modulate Atlantic meridional overturning circulation variability. Previous studies from the Cape Basin suggest that enhanced Agulhas leakage played an important role in accelerating glacial terminations. The southern African monsoon response to abrupt climate changes associated with meltwater-induced reorganizations of the North Atlantic meridional overturning circulation, and its impact on the Mozambique Channel throughflow and, by extension, on the Agulhas leakage is not well understood. Here we present a high-resolution 26,000 year-long hydroclimate record of northern Madagascar, a core region of the southern hemisphere monsoon domain, and a mixed layer temperature reconstruction using sediment cores collected from the runoff-influenced eastern Mozambique Channel. The record indicates precipitation increases centered at 11.7-12.5 thousand years before present (kyr BP), 14.5-19 kyr BP, 23-24 kyr BP, 25-26 kyr BP. Considering age model uncertainties, this is the first strong evidence for southern African monsoon strengthening in response to meltwater-induced northern high latitude climate instabilities during the Younger Dryas (YD), Heinrich Stadial 1 (HS1), HS2 and the HS-like event prior to HS2, in agreement with the results of transient climate simulations. Furthermore, our study shows a reversal of the mixed layer temperature gradient between the western and eastern Mozambique Channel during Heinrich event 1 (HE1). We posit that the gradient reversal indicates a weakening of the trade wind-driven South Equatorial Current and Mozambique Channel throughflow that likely weakened the Agulhas leakage, potentially creating a feedback that may have contributed to the sustained weakening of the AMOC during HE1 by reducing the amount of heat and salt leakage into the Atlantic.
    Schlagwort(e): Agulhas Leakage; marine sediments; Mozambique Channel; Mozambique Channel throughflow; oxygen isotope data; SST
    Materialart: Dataset
    Format: application/zip, 5 datasets
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 4
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    Petrographic observations and phase properties for sample sets from Wadi Somerah (OM10-Sam) and Wadi Wariyah (OM10-War), Oman (2020)
    PANGAEA
    Details
    Publikationsdatum: 2023-02-08
    Beschreibung: As largest and best-exposed paleo-fast-spread oceanic crust on land, the Samail ophiolite in the Sultanate of Oman represents an ideal natural laboratory for investigating processes at fast-spreading mid-ocean ridges. We studied two layered gabbro sequences from different stratigraphic depths: one from the middle of the plutonic crust showing dm-scale modal layering with olivine abundance gradually decreasing from layer base to top (Wadi Somerah, Sumail block) and one located near the crust-mantle boundary showing mm-scale layers being enriched in olivine (Wadi Wariyah, Wadi Tayin block). Petrographic analyses were performed at the Institut für Mineralogie (Leibniz Universität Hannover, Germany) for thin-section description. Plagioclase and Clinopyroxene are present in all samples, most of the samples also include olivine as primary phase and are therefore described as olivine gabbro. The olivine content increases per layer towards the layer base. Grain sizes of the three primary phases olivine, plagioclase and clinopyroxene vary between 0.2 and 5 mm. Olivine usually forms the largest grains, plagioclase the smallest ones. The grain shapes are generally subhedral, their habit is prismatic or, occasionally, irregular or elongated. Some olivine grains show reaction rims or contain plagioclase chadacrysts. Poikilitic clinopyroxene also containing plagioclase as chadacrysts is very common. The described phases are only the primary minerals not taking the low to medium degree of alteration and therefore presence of secondary phases into account.
    Schlagwort(e): DEPTH, sediment/rock; Drilling/coring; Elevation of event; Event label; Feature; Formation of Layered Gabbros; Grain size, mean; Habit; Latitude of event; Layer number; Longitude of event; Lower Oceanic Crust; Main Lithology; Mode, area; Mode, grain size, description; OM10-Sam; OM10-War; Oman; Oman Ophiolite; Polarisation microscopy (Leica Leitz DMRP); Sample code/label; Shape; Wadi Somerah, Sumail block; Wadi Wariyah, Wadi Tayin block
    Materialart: Dataset
    Format: text/tab-separated-values, 746 data points
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    DATA PANGAEA
  • 5
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    Petrographic features of rock samples of the Wadi Gideah reference profile (2021)
    PANGAEA
    Details
    Publikationsdatum: 2023-02-12
    Schlagwort(e): According to Gillis et al. (2014); Amphibole, altered; Amphibole, habit; Amphibole, primary original; Amphibole, shape; Clinopyroxene, altered; Clinopyroxene, grain size; Clinopyroxene, habit; Clinopyroxene, modal; Clinopyroxene, shape; Comment; Depth above Mohorovicic discontinuity; Electronprobe Microanalysis; Event label; Fast-spreading oceanic crust; gabbro; Grain size description; HAND; Iron-titanium oxides, habit; Iron-titanium oxides, shape; Latitude of event; Longitude of event; Mineral Analyses; Minerals, total alteration; Minerals, total modal primary; Olivine, altered; Olivine, grain size; Olivine, habit; Olivine, modal; Olivine, shape; OM10-A02; OM10-A03; OM10-A04; OM10-A05A; OM10-A05B; OM10-A06; OM10-A10; OM10-A11; OM10-A11-1a; OM10-A11-1b; OM10-A11-1c; OM10-A11-1d; OM10-A11-1e; OM10-A11-1f; OM10-A11-1i; OM10-A11-1j; OM10-A11-1l; OM10-A11-1m; OM10-A11-1n; OM10-A11-1o; OM10-A11-1p; OM10-A11-1q; OM10-A11-1r; OM10-A11-1s; OM10-A11-1t; OM10-A11-1u; OM10-A11-1v; OM10-A11-1w; OM10-A11-1x; OM10-A11-2; OM10-A11-3; OM10-A12-1A; OM10-A12-1B; OM10-A12-1C; OM10-A12-1D; OM10-A12-2A; OM10-A12-2B; OM10-A12-2C; OM10-A12-2D; OM10-A12-3; OM10-A13; OM10-A14; OM10-A14A; OM10-A14b; OM10-A15; OM10-A16; OM10-A17; OM10-A17-1; OM10-A17-2; OM10-A17-3A; OM10-A17-3B; OM10-A17-3C; OM10-A18; OM10-A18-1; OM10-A18-2a; OM10-A18-2B; OM10-A18-2C; OM10-A19; OM10-A20; OM10-A20A; OM10-A20B; OM10-A21; OM10-A22; OM10-A23; OM10-A23B; OM10-A24; OM10-A25; OM10-A25-1A; OM10-A25-1B; OM10-A25-1D; OM10-A25-1E; OM10-A26; OM10-A26-1; OM10-A27; OM10-A28; OM10-A29; OM10-A30; OM10-A31; OM10-A32; OM10-A33; OM10-A34; OM10-A34A; OM10-A35; OM10-A36; OM10-A37; OM11-10; OM11-9; OM11-A21A; OM11-A21B; OM11-A22; OM11-A26; OM11-A27; OM11-A27-1; OM11-A28B; OM11-A29; OM11-A29-1; OM11-A29-2; OM12-024; OM12-025; OM12-026; OM12-027; OM12-028; OM12-029; OM12-030; OM12-031; OM12-032; OM12-033; OM12-034A; OM12-034B; OM12-035; OM12-036; OM12-037; OM12-038; OM12-039; OM12-040; OM12-041; OM12-042; OM12-043; OM12-044; OM12-045; OM12-046; OM12-047; OM12-048; OM12-049; OM12-050; OM12-051; OM12-052; OM12-053; OM12-054; OM12-055; OM12-057; OM12-058; OM12-059; OM12-201; OM12-202; OM12-203; OM12-204; OM12-205; OM12-206; OM12-207; OM12-208; OM12-209; OM12-210; OM12-211; OM12-212A; OM12-212B; OM12-213; OM12-214; OM12-215; OM12-216A; OM12-216B; OM12-217; OM12-218; OM12-219; OM12-220; OM12-Hy0; OM12-Hy018; OM12-Hy023; OM12-Hy025; OM12-Hy030; OM12-Hy032A; OM12-Hy032B; OM12-Hy032C; OM12-Hy032D; OM12-Hy038; OM12-Hy039; OM12-Hy042; OM12-Hy055B; OM12-Hy058.5; OM12-Hy059; OM12-Hy059.5; OM12-Hy062; OM12-Hy068; OM12-Hy077; OM12-Hy080; OM12-Hy080.5; OM12-Hy096; OM12-Hy102; OM12-Hy103; OM12-Hy108; OM12-Hy154; OM12-Hy166; OM15-01; OM15-02; OM15-03A; OM15-03B; OM15-03E; OM15-03F; OM15-04; OM15-05; OM15-06; OM15-07; OM15-08; OM15-09; OM15-10; OM15-11; OM15-13; OM15-14; OM15-15A; OM15-15B; OM15-15C; Om15-15D; OM15-16; OM15-17; OM15-18; OM15-19A; OM15-19B; OM15-19C; OM15-20; OM15-21; OM15-22; OM15-23; OM15-24; OM15-25A; OM15-25B; OM15-26; OM15-27; OM15-28; OM15-29G; OM15-29I; OM15-29J; OM15-30; OM15-31; OM15-32; OM15-33; OM15-34; OM15-35; OM15-36; OM15-37; OM15-40; Oman; Oman Ophiolite; Orthopyroxene, altered; Orthopyroxene, grain size; Orthopyroxene, habit; Orthopyroxene, modal; Orthopyroxene, shape; Oxides, modal; Petrographic Data; Plagioclase, altered; Plagioclase, grain size; Plagioclase, habit; Plagioclase, modal; Plagioclase, shape; Plagioclase, zoning extent; Plagioclase, zoning type; Quartz; Rocks in Hydrothermal Fault Zone; Rock type; Samail Ophiolite; Sampling by hand; Texture; Texture, modified; Unit; Visual description
    Materialart: Dataset
    Format: text/tab-separated-values, 5809 data points
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    DATA PANGAEA
  • 6
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    EPMA analyses of minerals from rocks of the Wadi Gideah reference profile (2021)
    PANGAEA
    Details
    Publikationsdatum: 2023-02-22
    Schlagwort(e): According to Gillis et al. (2014); Aluminium oxide; Aluminium oxide, standard deviation; Anorthite content in plagioclase; Anorthite content in plagioclase, standard deviation; Calcium oxide; Calcium oxide, standard deviation; Chromium(III) oxide; Chromium(III) oxide, standard deviation; Comment; Depth above Mohorovicic discontinuity; Electronprobe Microanalysis; Electron Probe Microanalysis (EPMA); Event label; Fast-spreading oceanic crust; gabbro; HAND; Iron oxide, FeO; Iron oxide, FeO, standard deviation; Magnesium oxide; Magnesium oxide, standard deviation; Magnesium oxide/(Magnesium oxide/Iron oxide, FeO, total) molar ratio; Magnesium oxide/(Magnesium oxide/Iron oxide, FeO, total) molar ratio, standard deviation; Main Lithology; Manganese oxide; Manganese oxide, standard deviation; Mineral Analyses; Nickel oxide; Nickel oxide, standard deviation; Number of analyses; OM10-A11-1a; OM10-A11-1c; OM10-A11-1n; OM10-A11-1o; OM10-A11-1p; OM10-A11-1q; OM10-A11-1v; OM10-A11-1w; OM10-A11-1x; OM10-A12-1D; OM10-A13; OM10-A14; OM10-A14A; OM10-A14b; OM10-A15; OM10-A16; OM10-A17; OM10-A17-1; OM10-A17-2; OM10-A18; OM10-A18-1; OM10-A18-2a; OM10-A19; OM10-A20; OM10-A20A; OM10-A20B; OM10-A21; OM10-A22; OM10-A23; OM10-A23B; OM10-A24; OM10-A25; OM10-A26; OM10-A27; OM10-A28; OM10-A29; OM10-A30; OM10-A31; OM10-A32; OM11-A21A; OM11-A21B; OM11-A22; OM11-A26; OM11-A27; OM11-A27-1; OM11-A28B; OM11-A29; OM11-A29-1; OM11-A29-2; OM12-025; OM12-026; OM12-027; OM12-028; OM12-029; OM12-030; OM12-031; OM12-032; OM12-033; OM12-034A; OM12-034B; OM12-035; OM12-036; OM12-037; OM12-038; OM12-039; OM12-040; OM12-041; OM12-042-1; OM12-042-2; OM12-043; OM12-044; OM12-045; OM12-046; OM12-047; OM12-048; OM12-049; OM12-050; OM12-051; OM12-052; OM12-053; OM12-054; OM12-055; OM12-057; OM12-058; OM12-059; OM12-201; OM12-202; OM12-203; OM12-204; OM12-205; OM12-206; OM12-207; OM12-208; OM12-209; OM12-210; OM12-211; OM12-213; OM12-214; OM12-217; OM12-218; OM12-219; OM12-Hy0; OM12-Hy018; OM12-Hy023; OM12-Hy025; OM12-Hy030; OM12-Hy032B; OM12-Hy038; OM12-Hy039-1; OM12-Hy039-2; OM12-Hy042; OM12-Hy055B; OM12-Hy059; OM12-Hy059.5; OM12-Hy062; OM12-Hy068; OM12-Hy077; OM12-Hy080.5; OM12-Hy102-1; OM12-Hy102-2; OM12-Hy108; OM12-Hy154-1; OM12-Hy154-2; OM12-Hy166; OM15-01; OM15-02; OM15-10; OM15-13; OM15-15C; Om15-15D; OM15-18; OM15-19A; OM15-21; OM15-24; OM15-26; OM15-27; OM15-30; OM15-32; OM15-33; OM15-40; Oman; Oman Ophiolite; Petrographic Data; Phase; Potassium oxide; Potassium oxide, standard deviation; Reference/source; Rocks in Hydrothermal Fault Zone; Rock type; Samail Ophiolite; Sample comment; Sampling by hand; Silicon dioxide; Silicon dioxide, standard deviation; Sodium oxide; Sodium oxide, standard deviation; Textural features; Texture; Titanium dioxide; Titanium dioxide, standard deviation; Total; Unit
    Materialart: Dataset
    Format: text/tab-separated-values, 18271 data points
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    DATA PANGAEA
  • 7
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    Stable isotope data and sedimentology of core Orgon4-KS8 (2000)
    PANGAEA
    Details
    Publikationsdatum: 2023-02-12
    Schlagwort(e): Arabian Sea; Calcium carbonate; Carbon, organic, total; Cibicidoides wuellerstorfi, δ13C; Cibicidoides wuellerstorfi, δ18O; DEPTH, sediment/rock; Element analyser CHN; Element analyser CHN, LECO; Element analysis coulometric; gcmd1; Globigerinoides ruber pink, δ13C; Globigerinoides ruber pink, δ18O; Grain size, SEDIGRAPH 5000; Mass spectrometer Finnigan MAT 251; Nitrogen, total; Orgon4-KS8; Size fraction 〈 0.002 mm, clay; Sulfur, total; δ13C, carbonate; δ18O, carbonate
    Materialart: Dataset
    Format: text/tab-separated-values, 991 data points
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    DATA PANGAEA
  • 8
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    Porewater geochemistry of sediments from ROV push cores during Pourquoi Pas ? cruise INDEX2016, Hydrothermal Vent Outlet in the Kairei Field (2021)
    PANGAEA
    Details
    Publikationsdatum: 2023-03-02
    Beschreibung: Deep-sea sediment samples were taken from the (wider) Kairei hydrothermal field area (25°S, 70°E) as well as a remote site (26°S, 71°E) in the Indian Ocean during the INDEX cruise 2016 with the N/O Pourquoi pas? (Ifremer, France). Push core samples from different areas of the Kairei vent field, as well as a sample from the remote site (~200 km south-east from the Kairei), were recovered with the help of the ROV VICTOR 6000 (Ifremer, France). All subsampling steps were carried out shipboard at 4 °C. Porewater from push cores was extracted with rhizons (CSS, 5 cm Rhizosphere Research Products B.V., Netherlands) at a resolution of 2-3 cm, fixed with 1% HNO3 for trace element analyses and stored at 4 °C. With sterile syringes (nozzles removed) 3 ml of 2 cm layers of sediment were transferred into sterile falcon tubes for DNA extraction and stored at –80 °C. Concentrations of minor and trace elements Li, Al, Rb, Cs, Sr, Ba, V, Mn, Fe, Co, Ni, Cu, Zn, Ag, Cd, Tl, Pb, In, Sn, Sb, Bi, W, Mo, U, Au, As, and L were determined by highresolution ICP-SF-MS (Element XR, Thermo Scientific) after 25-fold dilution and spiking with Y and Re for internal standardization using appropriate mass resolution settings.
    Schlagwort(e): 16S rRNA gene tags; Aluminium; Antimony; Area/locality; Arsenic; Barium; Cadmium; Caesium; Cerium; Cobalt; Copper; DEPTH, sediment/rock; Europium; Event label; geochemistry of porewaters; hydrothermal vent; ICP-OES; ICP-SF-MS, Thermo Scientific, Element XR; INDEX2016; INDEX2016_12ROV; INDEX2016_20ROV; Indian Ocean; Ion chromatography; Iron; Kairei field; Lanthanum; Lead; Manganese; metalliferous sediments; Molybdenum; Neodymium; Nickel; Nitrate; Pourquoi Pas ? (2005); Praseodymium; Samarium; Sample code/label; Silica, dissolved; Silver; Thallium; Tin; Tungsten; Uranium; Vanadium; VICTOR; Victor6000 ROV; Zinc
    Materialart: Dataset
    Format: text/tab-separated-values, 942 data points
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    DATA PANGAEA
  • 9
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    End-member compositions of hydrothermal fluids from SONNE cruise SO253 (2020)
    PANGAEA
    Details
    Publikationsdatum: 2023-06-19
    Beschreibung: Calculated end-member compositions of hydrothermal fluids (for samples that have at least ≥ 85 % end-member) from Haungaroa, Brothers Upper Caldera and NW Caldera Wall, Kermadec intraoceanic arc. Ambient background seawater concentrations are given for comparison.
    Schlagwort(e): Aluminium; Barium; Boron; Bromine; Calcium; Chlorine; CTD/Rosette; CTD-RO; Event label; high-chlorinity acidsulfate fluids; high Mg-fluids; Hydrogen sulfide; HYDROTHERMADEC; hydrothermalism at intraoceanic arcs; ICP-MS; ICP-OES; Ion chromatography; Iron; Kermadec arc; Lithium; Manganese; Mediterranean stages; Photometer; Potassium; Remote operated vehicle; ROV; Sample ID; Silicon; SO253; SO253_35-1; SO253_64-1; SO253_67-1; SO253_80-1; SO253_81-1; SO253_85-1; Sonne_2; South Pacific Ocean; Stage; Strontium; Sulfate; trace metals; Uranium; Zinc
    Materialart: Dataset
    Format: text/tab-separated-values, 210 data points
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  • 10
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    Rare Earth Element and yttrium (REY) concentrations from SONNE cruise SO253 (2020)
    PANGAEA
    Details
    Publikationsdatum: 2023-06-19
    Beschreibung: Rare Earth Element and yttrium (REY) concentrations measured with ICP-MS in hydrothermal fluids from the Kermadec intraoceanic arc. Seawater from 1000 m water depth, values for SW are * 100 (SW data from Alibo and Nozaki (1999; doi:10.1016/S0016-7037(98)00279-8)).
    Schlagwort(e): Cerium; Comment; CTD/Rosette; CTD-RO; Dysprosium; Erbium; Europium; Event label; Gadolinium; high-chlorinity acidsulfate fluids; high Mg-fluids; Holmium; HYDROTHERMADEC; hydrothermalism at intraoceanic arcs; ICP-MS (Perkin Elmer, NexION 350X); Kermadec arc; Lanthanum; Lanthanum/Ytterbium ratio; Lutetium; Neodymium; Praseodymium; Rare-earth elements; Remote operated vehicle; ROV; Samarium; Sample ID; SO253; SO253_13-1; SO253_18-1; SO253_23-1; SO253_26-1; SO253_30-1; SO253_35-1; SO253_45-1; SO253_48-1; SO253_61-1; SO253_64-1; SO253_67-1; SO253_72-1; SO253_74-1; SO253_78-1; SO253_80-1; SO253_81-1; SO253_85-1; SO253_9-1; Sonne_2; South Pacific Ocean; Stage; Station label; Terbium; Thulium; trace metals; Ytterbium; Yttrium
    Materialart: Dataset
    Format: text/tab-separated-values, 1220 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
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