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Hallenberger, Maximilian; Reuning, Lars; Gallagher, Stephen John; Back, Stefan; Ishiwa, Takeshige; Christensen, Beth A; Bogus, Kara A (2019): Sediment analysis from IODP Hole 356-U1461C [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.908697, Supplement to: Hallenberger, M et al. (2019): Increased fluvial runoff terminated inorganic aragonite precipitation on the Northwest Shelf of Australia during the early Holocene. Scientific Reports, 9(1), https://doi.org/10.1038/s41598-019-54981-7

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Abstract:
Inorganic precipitation of aragonite is a common process within tropical carbonate environments. Across the Northwest Shelf of Australia (NWS) such precipitates were abundant in the late Pleistocene, whereas present-day sedimentation is dominated by calcitic bioclasts. This study presents sedimentological and geochemical analyses of core data retrieved from the upper 13 meters of IODP Site U1461 that provide a high-resolution sedimentary record of the last ~15 thousand years. Sediments that formed from 15 to 10.1 ka BP are aragonitic and characterised by small needles (<5 µm) and ooids. XRF elemental proxy data indicate that these sediments developed under arid conditions in which high marine alkalinity favoured carbonate precipitation. A pronounced change of XRF-proxy values around 10.1 ka BP indicates a transition to a more humid climate and elevated fluvial runoff. This climatic change coincides with a shelf-wide cessation of inorganic aragonite production and a switch to carbonate sedimentation dominated by skeletal calcite. High ocean water alkalinity due to an arid climate and low fluvial runoff therefore seems to be a prerequisite for the formation of shallow water aragonite-rich sediments on the NWS. These conditions are not necessarily synchronous to interglacial periods, but are linked to the regional hydrological cycle.
Keyword(s):
Carbonate Sedimentology; Northwest Shelf of Australia; palaeoclimate
Project(s):
Integrated Ocean Drilling Program / International Ocean Discovery Program (IODP)
Coverage:
Latitude: -20.214045 * Longitude: 115.065615
Date/Time Start: 2015-11-20T09:40:00 * Date/Time End: 2015-11-20T09:40:00
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Hallenberger, M; Reuning, L; Gallagher, SJ et al. (2019): 2D-XRD data from IODP Hole 356-U1461C. https://doi.org/10.1594/PANGAEA.908698
  2. Hallenberger, M; Reuning, L; Gallagher, SJ et al. (2019): Sedimentary composition from IODP Hole 356-U1461C. https://doi.org/10.1594/PANGAEA.908694
  3. Hallenberger, M; Reuning, L; Gallagher, SJ et al. (2019): XRD data from IODP Hole 356-U1461C. https://doi.org/10.1594/PANGAEA.908695
  4. Hallenberger, M; Reuning, L; Gallagher, SJ et al. (2019): XRF data from IODP Hole 356-U1461C. https://doi.org/10.1594/PANGAEA.908696