Benthic foraminifera abundance in ODP Leg 155 holes
The general Pleistocene architecture of the Amazon Fan has been reconstructed using sediment recovered by Ocean Drilling Program Leg 155. Huge regional mass-transport deposits (MTDs) make up a significant component of the Amazon Fan. These deposits each cover an area over 15,000 km**2 (approximately...
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Language: | English |
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PANGAEA
2005
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Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.742948 https://doi.org/10.1594/PANGAEA.742948 |
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.742948 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
155-933A 155-936A 155-941A Bolivinelina translucens Brizalina aenariensis Brizalina alata Brizalina cf. aenariensis Bulimina aculeata Bulimina costata Bulimina gibba Bulimina marginata Cassidulina laevigata Cibicidoides mundulus Counting >63 µm fraction DEPTH sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Event label Fissurina sp. Globobulimina turgida Globocassidulina subglobosa Islandiella cf. australis Joides Resolution Leg155 Lenticulina cultrata Nonionella opima Ocean Drilling Program ODP Pseudononion atlanticum Quinqueloculina cf. stalkeri Quinqueloculina lamarckiana Sample code/label South Atlantic Ocean Stainforthia complanata Uvigerina peregrina |
spellingShingle |
155-933A 155-936A 155-941A Bolivinelina translucens Brizalina aenariensis Brizalina alata Brizalina cf. aenariensis Bulimina aculeata Bulimina costata Bulimina gibba Bulimina marginata Cassidulina laevigata Cibicidoides mundulus Counting >63 µm fraction DEPTH sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Event label Fissurina sp. Globobulimina turgida Globocassidulina subglobosa Islandiella cf. australis Joides Resolution Leg155 Lenticulina cultrata Nonionella opima Ocean Drilling Program ODP Pseudononion atlanticum Quinqueloculina cf. stalkeri Quinqueloculina lamarckiana Sample code/label South Atlantic Ocean Stainforthia complanata Uvigerina peregrina Maslin, Mark Vilela, Naja Mikkelsen, Naja Grootes, Pieter Meiert Benthic foraminifera abundance in ODP Leg 155 holes |
topic_facet |
155-933A 155-936A 155-941A Bolivinelina translucens Brizalina aenariensis Brizalina alata Brizalina cf. aenariensis Bulimina aculeata Bulimina costata Bulimina gibba Bulimina marginata Cassidulina laevigata Cibicidoides mundulus Counting >63 µm fraction DEPTH sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Event label Fissurina sp. Globobulimina turgida Globocassidulina subglobosa Islandiella cf. australis Joides Resolution Leg155 Lenticulina cultrata Nonionella opima Ocean Drilling Program ODP Pseudononion atlanticum Quinqueloculina cf. stalkeri Quinqueloculina lamarckiana Sample code/label South Atlantic Ocean Stainforthia complanata Uvigerina peregrina |
description |
The general Pleistocene architecture of the Amazon Fan has been reconstructed using sediment recovered by Ocean Drilling Program Leg 155. Huge regional mass-transport deposits (MTDs) make up a significant component of the Amazon Fan. These deposits each cover an area over 15,000 km**2 (approximately the size of Jamaica), reach a maximum thickness of 200 m, and consist of ~5000 Gt of sediment. Benthic foraminiferal fauna analysis and sedimentology indicate that the MTDs originated on the continental slope, which is at least 200 km laterally and 1500 m above their present position. Each mass-failure event was formed by the catastrophic failure of the continental slope and has been dated and correlated with climate-induced changes in sea level. Studies of the benthic foraminiferal assemblages in the Amazon Fan has been essential to our reconstruction of the origin and cause of these failures. The MTDs contain rare shelf (Quinqueloculina cf. stalkeri, Brizalina aenariensis, Q. lamarckiana, and Pseudononion atlanticum) and dominant upper-middle bathyal species (cassidulinids and buliminids). We conclude that the MTD originated between 200 and 600 m water depth, approximately the same zone in which gas hydrates occur. We suggest that the glacial MTDs referred to as Deep Eastern MTD (35–37 ka) and Unit R MTD (41–45 ka) correlate with rapid drops in sea level which destabilized continental slope gas-hydrate reservoirs causing catastrophic slope failure. An alternative explanation is required for the deglacial MTDs referred to as Western and Eastern Debris Flows (13–14 ka) which occurred as sea level rose rapidly during the Bølling-Allerød period. We suggest that the deglaciation of the Andes and the consequent enhanced sediment supply coupled with a shift of the depo-centre to the continental shelf, caused over-burdening and thus slope failure. Evidence for a 2 per mil negative d13C shift in both planktonic foraminifera and organic matter coeval with these failures suggest that whatever the cause, there was a large ... |
format |
Dataset |
author |
Maslin, Mark Vilela, Naja Mikkelsen, Naja Grootes, Pieter Meiert |
author_facet |
Maslin, Mark Vilela, Naja Mikkelsen, Naja Grootes, Pieter Meiert |
author_sort |
Maslin, Mark |
title |
Benthic foraminifera abundance in ODP Leg 155 holes |
title_short |
Benthic foraminifera abundance in ODP Leg 155 holes |
title_full |
Benthic foraminifera abundance in ODP Leg 155 holes |
title_fullStr |
Benthic foraminifera abundance in ODP Leg 155 holes |
title_full_unstemmed |
Benthic foraminifera abundance in ODP Leg 155 holes |
title_sort |
benthic foraminifera abundance in odp leg 155 holes |
publisher |
PANGAEA |
publishDate |
2005 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.742948 https://doi.org/10.1594/PANGAEA.742948 |
op_coverage |
MEDIAN LATITUDE: 5.367267 * MEDIAN LONGITUDE: -47.525567 * SOUTH-BOUND LATITUDE: 5.096600 * WEST-BOUND LONGITUDE: -48.028800 * NORTH-BOUND LATITUDE: 5.632200 * EAST-BOUND LONGITUDE: -46.812300 * DATE/TIME START: 1994-04-12T19:04:00 * DATE/TIME END: 1994-05-07T23:50:00 * MINIMUM DEPTH, sediment/rock: 5.49 m * MAXIMUM DEPTH, sediment/rock: 396.34 m |
long_lat |
ENVELOPE(-48.028800,-46.812300,5.632200,5.096600) |
genre |
Planktonic foraminifera South Atlantic Ocean |
genre_facet |
Planktonic foraminifera South Atlantic Ocean |
op_source |
Supplement to: Maslin, Mark; Vilela, Naja; Mikkelsen, Naja; Grootes, Pieter Meiert (2005): Causes of catastrophic sediment failures of the Amazon Fan. Quaternary Science Reviews, 24(20-21), 2180-2193, https://doi.org/10.1016/j.quascirev.2005.01.016 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.742948 https://doi.org/10.1594/PANGAEA.742948 |
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.74294810.1016/j.quascirev.2005.01.016 |
_version_ |
1799487964912287744 |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.742948 2024-05-19T07:47:32+00:00 Benthic foraminifera abundance in ODP Leg 155 holes Maslin, Mark Vilela, Naja Mikkelsen, Naja Grootes, Pieter Meiert MEDIAN LATITUDE: 5.367267 * MEDIAN LONGITUDE: -47.525567 * SOUTH-BOUND LATITUDE: 5.096600 * WEST-BOUND LONGITUDE: -48.028800 * NORTH-BOUND LATITUDE: 5.632200 * EAST-BOUND LONGITUDE: -46.812300 * DATE/TIME START: 1994-04-12T19:04:00 * DATE/TIME END: 1994-05-07T23:50:00 * MINIMUM DEPTH, sediment/rock: 5.49 m * MAXIMUM DEPTH, sediment/rock: 396.34 m 2005 text/tab-separated-values, 506 data points https://doi.pangaea.de/10.1594/PANGAEA.742948 https://doi.org/10.1594/PANGAEA.742948 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.742948 https://doi.org/10.1594/PANGAEA.742948 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Maslin, Mark; Vilela, Naja; Mikkelsen, Naja; Grootes, Pieter Meiert (2005): Causes of catastrophic sediment failures of the Amazon Fan. Quaternary Science Reviews, 24(20-21), 2180-2193, https://doi.org/10.1016/j.quascirev.2005.01.016 155-933A 155-936A 155-941A Bolivinelina translucens Brizalina aenariensis Brizalina alata Brizalina cf. aenariensis Bulimina aculeata Bulimina costata Bulimina gibba Bulimina marginata Cassidulina laevigata Cibicidoides mundulus Counting >63 µm fraction DEPTH sediment/rock DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Event label Fissurina sp. Globobulimina turgida Globocassidulina subglobosa Islandiella cf. australis Joides Resolution Leg155 Lenticulina cultrata Nonionella opima Ocean Drilling Program ODP Pseudononion atlanticum Quinqueloculina cf. stalkeri Quinqueloculina lamarckiana Sample code/label South Atlantic Ocean Stainforthia complanata Uvigerina peregrina Dataset 2005 ftpangaea https://doi.org/10.1594/PANGAEA.74294810.1016/j.quascirev.2005.01.016 2024-04-30T23:34:34Z The general Pleistocene architecture of the Amazon Fan has been reconstructed using sediment recovered by Ocean Drilling Program Leg 155. Huge regional mass-transport deposits (MTDs) make up a significant component of the Amazon Fan. These deposits each cover an area over 15,000 km**2 (approximately the size of Jamaica), reach a maximum thickness of 200 m, and consist of ~5000 Gt of sediment. Benthic foraminiferal fauna analysis and sedimentology indicate that the MTDs originated on the continental slope, which is at least 200 km laterally and 1500 m above their present position. Each mass-failure event was formed by the catastrophic failure of the continental slope and has been dated and correlated with climate-induced changes in sea level. Studies of the benthic foraminiferal assemblages in the Amazon Fan has been essential to our reconstruction of the origin and cause of these failures. The MTDs contain rare shelf (Quinqueloculina cf. stalkeri, Brizalina aenariensis, Q. lamarckiana, and Pseudononion atlanticum) and dominant upper-middle bathyal species (cassidulinids and buliminids). We conclude that the MTD originated between 200 and 600 m water depth, approximately the same zone in which gas hydrates occur. We suggest that the glacial MTDs referred to as Deep Eastern MTD (35–37 ka) and Unit R MTD (41–45 ka) correlate with rapid drops in sea level which destabilized continental slope gas-hydrate reservoirs causing catastrophic slope failure. An alternative explanation is required for the deglacial MTDs referred to as Western and Eastern Debris Flows (13–14 ka) which occurred as sea level rose rapidly during the Bølling-Allerød period. We suggest that the deglaciation of the Andes and the consequent enhanced sediment supply coupled with a shift of the depo-centre to the continental shelf, caused over-burdening and thus slope failure. Evidence for a 2 per mil negative d13C shift in both planktonic foraminifera and organic matter coeval with these failures suggest that whatever the cause, there was a large ... Dataset Planktonic foraminifera South Atlantic Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-48.028800,-46.812300,5.632200,5.096600) |