Sediment analysis from IODP Hole 356-U1461C
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| Auteurs principaux: | , , , , , , |
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
2019
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| _version_ | 1867167677439541248 |
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| author | Hallenberger, Maximilian Reuning, Lars Gallagher, Stephen John Back, Stefan Ishiwa, Takeshige Christensen, Beth A Bogus, Kara A |
| author_facet | Hallenberger, Maximilian Reuning, Lars Gallagher, Stephen John Back, Stefan Ishiwa, Takeshige Christensen, Beth A Bogus, Kara A |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_908697 |
| institution | PANGAEA |
| language | en |
| publishDate | 2019 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Sediment analysis from IODP Hole 356-U1461C Hallenberger, Maximilian Reuning, Lars Gallagher, Stephen John Back, Stefan Ishiwa, Takeshige Christensen, Beth A Bogus, Kara A Carbonate Sedimentology; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Northwest Shelf of Australia; palaeoclimate 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. |
| title | Sediment analysis from IODP Hole 356-U1461C |
| topic | Carbonate Sedimentology; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Northwest Shelf of Australia; palaeoclimate |
| url | https://doi.org/10.1594/PANGAEA.908697 |