Benthic foraminiferal accumulation rates of the late Pliocene-Pleistocene in the northern Indian Ocean
During the late Pliocene–middle Pleistocene, 63 species of elongate, bathyal–upper abyssal benthic foraminifera (Extinction Group = Stilostomellidae, Pleurostomellidae, some Nodosariidae) declined in abundance and finally disappeared in the northern Indian Ocean (ODP Sites 722, 758), as part of the...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.684689 2024-09-15T17:48:05+00:00 Benthic foraminiferal accumulation rates of the late Pliocene-Pleistocene in the northern Indian Ocean Kawagata, Shungo Hayward, Bruce William Gupta, Anil K MEDIAN LATITUDE: 11.002933 * MEDIAN LONGITUDE: 75.078233 * SOUTH-BOUND LATITUDE: 5.384067 * WEST-BOUND LONGITUDE: 59.795300 * NORTH-BOUND LATITUDE: 16.621800 * EAST-BOUND LONGITUDE: 90.361167 * DATE/TIME START: 1987-09-08T12:00:00 * DATE/TIME END: 1988-06-15T00:00:00 2006 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.684689 https://doi.org/10.1594/PANGAEA.684689 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.684689 https://doi.org/10.1594/PANGAEA.684689 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Kawagata, Shungo; Hayward, Bruce William; Gupta, Anil K (2006): Benthic foraminiferal extinctions linked to late Pliocene–Pleistocene deep-sea circulation changes in the northern Indian Ocean (ODP Sites 722 and 758). Marine Micropaleontology, 58(3), 219-242, https://doi.org/10.1016/j.marmicro.2005.11.003 117-722B 121-758 Arabian Sea COMPCORE Composite Core DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg117 Leg121 Ocean Drilling Program ODP dataset publication series 2006 ftpangaea https://doi.org/10.1594/PANGAEA.68468910.1016/j.marmicro.2005.11.003 2024-07-24T02:31:42Z During the late Pliocene–middle Pleistocene, 63 species of elongate, bathyal–upper abyssal benthic foraminifera (Extinction Group = Stilostomellidae, Pleurostomellidae, some Nodosariidae) declined in abundance and finally disappeared in the northern Indian Ocean (ODP Sites 722, 758), as part of the global extinction of at least 88 related species at this time. The detailed record of withdrawal of these species differs by depth and geography in the Indian Ocean. In northwest Indian Ocean Site 722 (2045 m), the Extinction Group of 54 species comprised 2–15% of the benthic foraminiferal fauna in the earliest Pleistocene, but declined dramatically during the onset of the mid-Pleistocene Transition (MPT) at 1.2–1.1 Ma, with all but three species disappearing by the end of the MPT (~0.6 Ma). In northeast Indian Ocean Site 758 (2925 m), the Extinction Group of 44 species comprised 1–5% of the benthic foraminiferal fauna at ~3.3–2.6 Ma, but declined in abundance and diversity in three steps, at ~2.5, 1.7, and 1.2 Ma, with all but one species disappearing by the end of the MPT. At both sites there are strong positive correlations between the accumulation rate of the Extinction Group and proxies indicating low-oxygen conditions with a high organic carbon input. In both sites, there was a pulsed decline in Extinction Group abundance and species richness, especially in glacial periods, with some partial recoveries in interglacials. We infer that the glacial declines at the deeper Site 758 were a result of increased production of colder, well-ventilated Antarctic Bottom Water (AABW), particularly in the late Pliocene and during the MPT. The Extinction Group at shallower water depths (Site 722) were not impacted by the deeper water mass changes until the onset of the MPT, when cold, well-ventilated Glacial North Atlantic Intermediate Water (GNAIW) production increased and may have spread into the Indian Ocean. Increased chemical ventilation at various water depths since late Pliocene, particularly in glacial periods, possibly ... Other/Unknown Material Antarc* Antarctic North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(59.795300,90.361167,16.621800,5.384067) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
117-722B 121-758 Arabian Sea COMPCORE Composite Core DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg117 Leg121 Ocean Drilling Program ODP |
spellingShingle |
117-722B 121-758 Arabian Sea COMPCORE Composite Core DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg117 Leg121 Ocean Drilling Program ODP Kawagata, Shungo Hayward, Bruce William Gupta, Anil K Benthic foraminiferal accumulation rates of the late Pliocene-Pleistocene in the northern Indian Ocean |
topic_facet |
117-722B 121-758 Arabian Sea COMPCORE Composite Core DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg117 Leg121 Ocean Drilling Program ODP |
description |
During the late Pliocene–middle Pleistocene, 63 species of elongate, bathyal–upper abyssal benthic foraminifera (Extinction Group = Stilostomellidae, Pleurostomellidae, some Nodosariidae) declined in abundance and finally disappeared in the northern Indian Ocean (ODP Sites 722, 758), as part of the global extinction of at least 88 related species at this time. The detailed record of withdrawal of these species differs by depth and geography in the Indian Ocean. In northwest Indian Ocean Site 722 (2045 m), the Extinction Group of 54 species comprised 2–15% of the benthic foraminiferal fauna in the earliest Pleistocene, but declined dramatically during the onset of the mid-Pleistocene Transition (MPT) at 1.2–1.1 Ma, with all but three species disappearing by the end of the MPT (~0.6 Ma). In northeast Indian Ocean Site 758 (2925 m), the Extinction Group of 44 species comprised 1–5% of the benthic foraminiferal fauna at ~3.3–2.6 Ma, but declined in abundance and diversity in three steps, at ~2.5, 1.7, and 1.2 Ma, with all but one species disappearing by the end of the MPT. At both sites there are strong positive correlations between the accumulation rate of the Extinction Group and proxies indicating low-oxygen conditions with a high organic carbon input. In both sites, there was a pulsed decline in Extinction Group abundance and species richness, especially in glacial periods, with some partial recoveries in interglacials. We infer that the glacial declines at the deeper Site 758 were a result of increased production of colder, well-ventilated Antarctic Bottom Water (AABW), particularly in the late Pliocene and during the MPT. The Extinction Group at shallower water depths (Site 722) were not impacted by the deeper water mass changes until the onset of the MPT, when cold, well-ventilated Glacial North Atlantic Intermediate Water (GNAIW) production increased and may have spread into the Indian Ocean. Increased chemical ventilation at various water depths since late Pliocene, particularly in glacial periods, possibly ... |
format |
Other/Unknown Material |
author |
Kawagata, Shungo Hayward, Bruce William Gupta, Anil K |
author_facet |
Kawagata, Shungo Hayward, Bruce William Gupta, Anil K |
author_sort |
Kawagata, Shungo |
title |
Benthic foraminiferal accumulation rates of the late Pliocene-Pleistocene in the northern Indian Ocean |
title_short |
Benthic foraminiferal accumulation rates of the late Pliocene-Pleistocene in the northern Indian Ocean |
title_full |
Benthic foraminiferal accumulation rates of the late Pliocene-Pleistocene in the northern Indian Ocean |
title_fullStr |
Benthic foraminiferal accumulation rates of the late Pliocene-Pleistocene in the northern Indian Ocean |
title_full_unstemmed |
Benthic foraminiferal accumulation rates of the late Pliocene-Pleistocene in the northern Indian Ocean |
title_sort |
benthic foraminiferal accumulation rates of the late pliocene-pleistocene in the northern indian ocean |
publisher |
PANGAEA |
publishDate |
2006 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.684689 https://doi.org/10.1594/PANGAEA.684689 |
op_coverage |
MEDIAN LATITUDE: 11.002933 * MEDIAN LONGITUDE: 75.078233 * SOUTH-BOUND LATITUDE: 5.384067 * WEST-BOUND LONGITUDE: 59.795300 * NORTH-BOUND LATITUDE: 16.621800 * EAST-BOUND LONGITUDE: 90.361167 * DATE/TIME START: 1987-09-08T12:00:00 * DATE/TIME END: 1988-06-15T00:00:00 |
long_lat |
ENVELOPE(59.795300,90.361167,16.621800,5.384067) |
genre |
Antarc* Antarctic North Atlantic |
genre_facet |
Antarc* Antarctic North Atlantic |
op_source |
Supplement to: Kawagata, Shungo; Hayward, Bruce William; Gupta, Anil K (2006): Benthic foraminiferal extinctions linked to late Pliocene–Pleistocene deep-sea circulation changes in the northern Indian Ocean (ODP Sites 722 and 758). Marine Micropaleontology, 58(3), 219-242, https://doi.org/10.1016/j.marmicro.2005.11.003 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.684689 https://doi.org/10.1594/PANGAEA.684689 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.68468910.1016/j.marmicro.2005.11.003 |
_version_ |
1810289024094437376 |