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  • 353-U1443A; 353-U1443B; 353-U1443C; AGE; Bay of Bengal; calculated, 2 sigma; Core; Cruise/expedition; Depth, composite; detrital clays; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Exp353; Hole; Interval number; Joides Resolution; Late Miocene; Lead-206/Lead-204 ratio; Lead-206/Lead-204 ratio, standard deviation; Lead-207/Lead-204 ratio; Lead-207/Lead-204 ratio, standard deviation; Lead-208/Lead-204 ratio; Lead-208/Lead-204 ratio, standard deviation; MC-ICP-MS; Neodymium-143/Neodymium-144 ratio; Radiogenic isotopes; Sample code/label; Sample comment; Section; Site; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, standard deviation; Type; Weathering; ε-Neodymium; ε-Neodymium, standard deviation  (1)
  • Africa, Tanzania; Age model; HAND; Illite; Olduvai-Paleolake; Sample ID; Sampling by hand; Smectite; δ18O, illite-smectite  (1)
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  • 1
    facet.materialart.
    Unknown
    Relative proportions of smectite and illite, and illite-smectite oxygen-isotope compositions (δ18OI-S) of 39 mudstone samples collected from a lacustrian section at Paleolake Olduvai (2020)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Description: Most clay minerals in sedimentary environments have traditionally been considered to be of detrital origin, but under certain conditions, authigenic clay minerals can form at low temperature through the transformation of precursor clays or as direct precipitates from lake-water. Such clay minerals can hold important information about the prevailing climatic conditions during the time of deposition. We present the first quantitative reconstruction of salinity in paleolake Olduvai based on the oxygen-isotope composition of authigenic clay minerals. We provide a framework illustrating that the isotopic signature of authigenic lacustrine clay minerals is related to the isotopic composition of paleo-waters, and hence to paleosalinity. This new paleosalinity proxy shows that the early Pleistocene East African monsoon was driven by combinations of precession and obliquity forcing, and subsequent changes in tropical SSTs. Such quantitative lacustrine paleosalinity estimates provides a new direction of research for modeling ecosystem change based on an ecologically relevant parameter.
    Keywords: Africa, Tanzania; Age model; HAND; Illite; Olduvai-Paleolake; Sample ID; Sampling by hand; Smectite; δ18O, illite-smectite
    Type: Dataset
    Format: text/tab-separated-values, 195 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
    facet.materialart.
    Unknown
    Late Miocene radiogenic Sr, Nd, and Pb isotope data of the detrital clay fraction from IODP Site 353-U1443 (2021)
    PANGAEA
    Details
    Publication Date: 2023-07-10
    Description: Data from Enhanced late Miocene chemical weathering and altered precipitation patterns in the watersheds of the Bay of Bengal recorded by detrital clay radiogenic isotopes in Paleoceanography and Paleoclimatology. Marine sediment samples from the late Miocene (approximately 9 to 5 million years ago) were taken from International Ocean Discovery Program (IODP) Site U1443 located on the top of the Ninety East ridge in the southern Bay of Bengal. Samples were taken along the composite sediment section or splice and the age model based on shipboard calcareous nannofossil biostratigraphy and magnetostratigraphy was refined using the stable carbon isotopes of benthic foraminifera. The detrital silicates of the clay size fraction were isolated and measured for their radiogenic Sr, Nd, and Pb isotope composition by multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) to investigate the provenance of clays produced by weathering in the surrounding watersheds.
    Keywords: 353-U1443A; 353-U1443B; 353-U1443C; AGE; Bay of Bengal; calculated, 2 sigma; Core; Cruise/expedition; Depth, composite; detrital clays; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Exp353; Hole; Interval number; Joides Resolution; Late Miocene; Lead-206/Lead-204 ratio; Lead-206/Lead-204 ratio, standard deviation; Lead-207/Lead-204 ratio; Lead-207/Lead-204 ratio, standard deviation; Lead-208/Lead-204 ratio; Lead-208/Lead-204 ratio, standard deviation; MC-ICP-MS; Neodymium-143/Neodymium-144 ratio; Radiogenic isotopes; Sample code/label; Sample comment; Section; Site; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, standard deviation; Type; Weathering; ε-Neodymium; ε-Neodymium, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 968 data points
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    DATA PANGAEA
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