Multi-proxy analyses of sediment cores from the Pakistan continental margin
Late Holocene laminated sediments from a core transect centred in the oxygen minimum zone (OMZ) impinging at the continental slope off Pakistan indicate stable oxygen minimum conditions for the past 7000 calendar years. High SW-monsoon-controlled biological productivity and enhanced organic matter p...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.735733 2023-05-15T16:00:06+02:00 Multi-proxy analyses of sediment cores from the Pakistan continental margin von Rad, Ulrich Schulz, Hartmut Riech, Volkher den Dulk, Marieke Berner, Ulrich Sirocko, Frank MEDIAN LATITUDE: 23.121222 * MEDIAN LONGITUDE: 66.496222 * SOUTH-BOUND LATITUDE: 23.121000 * WEST-BOUND LONGITUDE: 66.496000 * NORTH-BOUND LATITUDE: 23.122000 * EAST-BOUND LONGITUDE: 66.497000 * DATE/TIME START: 1993-09-22T00:00:00 * DATE/TIME END: 1993-09-22T00:00:00 1999-03-25 application/zip, 9 datasets https://doi.pangaea.de/10.1594/PANGAEA.735733 https://doi.org/10.1594/PANGAEA.735733 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.735733 https://doi.org/10.1594/PANGAEA.735733 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: von Rad, Ulrich; Schulz, Hartmut; Riech, Volkher; den Dulk, Marieke; Berner, Ulrich; Sirocko, Frank (1999): Multiple monsoon-controlled breakdown of oxygen-minimum conditions during the past 30,000 years documented in laminated sediment off Pakistan. Palaeogeography, Palaeoclimatology, Palaeoecology, 152(1-2), 129-161, https://doi.org/10.1016/S0031-0182(99)00042-5 Arabian Sea KAL Kasten corer KL PAKOMIN Piston corer (BGR type) SO90 SO90_136KL SO90_137KA Sonne Dataset 1999 ftpangaea https://doi.org/10.1594/PANGAEA.735733 https://doi.org/10.1016/S0031-0182(99)00042-5 2023-01-20T07:31:42Z Late Holocene laminated sediments from a core transect centred in the oxygen minimum zone (OMZ) impinging at the continental slope off Pakistan indicate stable oxygen minimum conditions for the past 7000 calendar years. High SW-monsoon-controlled biological productivity and enhanced organic matter preservation during this period is reflected in high contents of total organic carbon (TOC) and redox-sensitive elements (Ni, V), as well as by a low-diversity, high-abundance benthic foraminiferal Buliminacea association and high abundance of the planktonic species Globigerina bulloides indicative of upwelling conditions. Surface-water productivity was strongest during SW monsoon maxima. Stable OMZ conditions (reflected by laminated sediments) were found also during warm interstadial events (Preboreal, Bølling-Allerød, and Dansgaard-Oeschger events), as well as during peak glacial times (17-22.5 ka, all ages in calendar years). Sediment mass accumulation rates were at a maximum during the Preboreal and Younger Dryas periods due to strong riverine input and mobilisation of fine-grained sediment coinciding with rapid deglacial sea-level rise, whereas eolian input generally decreased from glacial to interglacial times. In contrast, the occurrence of bioturbated intervals from 7 to 10.5 ka (early Holocene), in the Younger Dryas (11.7-13 ka), from 15 to 17 ka (Heinrich event 1) and from 22.5 to 25 ka (Heinrich event 2) suggests completely different conditions of oxygen-rich bottom waters, extremely low mass and organic carbon accumulation rates, a high-diversity benthic fauna, all indicating lowered surface-water productivity. During these intervals the OMZ was very poorly developed or absent and a sharp fall of the aragonite compensation depth favoured the preservation of pteropods. The abundance of lithogenic proxies suggests aridity and wind transport by northwesterly or northeasterly winds during these periods coinciding with the North Atlantic Heinrich events and dust peaks in the Tibetan Loess records. The ... Dataset Dansgaard-Oeschger events North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(66.496000,66.497000,23.122000,23.121000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Arabian Sea KAL Kasten corer KL PAKOMIN Piston corer (BGR type) SO90 SO90_136KL SO90_137KA Sonne |
spellingShingle |
Arabian Sea KAL Kasten corer KL PAKOMIN Piston corer (BGR type) SO90 SO90_136KL SO90_137KA Sonne von Rad, Ulrich Schulz, Hartmut Riech, Volkher den Dulk, Marieke Berner, Ulrich Sirocko, Frank Multi-proxy analyses of sediment cores from the Pakistan continental margin |
topic_facet |
Arabian Sea KAL Kasten corer KL PAKOMIN Piston corer (BGR type) SO90 SO90_136KL SO90_137KA Sonne |
description |
Late Holocene laminated sediments from a core transect centred in the oxygen minimum zone (OMZ) impinging at the continental slope off Pakistan indicate stable oxygen minimum conditions for the past 7000 calendar years. High SW-monsoon-controlled biological productivity and enhanced organic matter preservation during this period is reflected in high contents of total organic carbon (TOC) and redox-sensitive elements (Ni, V), as well as by a low-diversity, high-abundance benthic foraminiferal Buliminacea association and high abundance of the planktonic species Globigerina bulloides indicative of upwelling conditions. Surface-water productivity was strongest during SW monsoon maxima. Stable OMZ conditions (reflected by laminated sediments) were found also during warm interstadial events (Preboreal, Bølling-Allerød, and Dansgaard-Oeschger events), as well as during peak glacial times (17-22.5 ka, all ages in calendar years). Sediment mass accumulation rates were at a maximum during the Preboreal and Younger Dryas periods due to strong riverine input and mobilisation of fine-grained sediment coinciding with rapid deglacial sea-level rise, whereas eolian input generally decreased from glacial to interglacial times. In contrast, the occurrence of bioturbated intervals from 7 to 10.5 ka (early Holocene), in the Younger Dryas (11.7-13 ka), from 15 to 17 ka (Heinrich event 1) and from 22.5 to 25 ka (Heinrich event 2) suggests completely different conditions of oxygen-rich bottom waters, extremely low mass and organic carbon accumulation rates, a high-diversity benthic fauna, all indicating lowered surface-water productivity. During these intervals the OMZ was very poorly developed or absent and a sharp fall of the aragonite compensation depth favoured the preservation of pteropods. The abundance of lithogenic proxies suggests aridity and wind transport by northwesterly or northeasterly winds during these periods coinciding with the North Atlantic Heinrich events and dust peaks in the Tibetan Loess records. The ... |
format |
Dataset |
author |
von Rad, Ulrich Schulz, Hartmut Riech, Volkher den Dulk, Marieke Berner, Ulrich Sirocko, Frank |
author_facet |
von Rad, Ulrich Schulz, Hartmut Riech, Volkher den Dulk, Marieke Berner, Ulrich Sirocko, Frank |
author_sort |
von Rad, Ulrich |
title |
Multi-proxy analyses of sediment cores from the Pakistan continental margin |
title_short |
Multi-proxy analyses of sediment cores from the Pakistan continental margin |
title_full |
Multi-proxy analyses of sediment cores from the Pakistan continental margin |
title_fullStr |
Multi-proxy analyses of sediment cores from the Pakistan continental margin |
title_full_unstemmed |
Multi-proxy analyses of sediment cores from the Pakistan continental margin |
title_sort |
multi-proxy analyses of sediment cores from the pakistan continental margin |
publisher |
PANGAEA |
publishDate |
1999 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.735733 https://doi.org/10.1594/PANGAEA.735733 |
op_coverage |
MEDIAN LATITUDE: 23.121222 * MEDIAN LONGITUDE: 66.496222 * SOUTH-BOUND LATITUDE: 23.121000 * WEST-BOUND LONGITUDE: 66.496000 * NORTH-BOUND LATITUDE: 23.122000 * EAST-BOUND LONGITUDE: 66.497000 * DATE/TIME START: 1993-09-22T00:00:00 * DATE/TIME END: 1993-09-22T00:00:00 |
long_lat |
ENVELOPE(66.496000,66.497000,23.122000,23.121000) |
genre |
Dansgaard-Oeschger events North Atlantic |
genre_facet |
Dansgaard-Oeschger events North Atlantic |
op_source |
Supplement to: von Rad, Ulrich; Schulz, Hartmut; Riech, Volkher; den Dulk, Marieke; Berner, Ulrich; Sirocko, Frank (1999): Multiple monsoon-controlled breakdown of oxygen-minimum conditions during the past 30,000 years documented in laminated sediment off Pakistan. Palaeogeography, Palaeoclimatology, Palaeoecology, 152(1-2), 129-161, https://doi.org/10.1016/S0031-0182(99)00042-5 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.735733 https://doi.org/10.1594/PANGAEA.735733 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.735733 https://doi.org/10.1016/S0031-0182(99)00042-5 |
_version_ |
1766395970148368384 |