Middle Miocene isotope stratigraphy and paleoceanographic evolution of the northwest and southwest Australian margins (Wombat Plateau and Great Australian Bight)
The benthic stable isotope record from ODP Site 761 (Wombat Plateau, NW Australia, 2179.3 m water depth) documents complete recovery of the middle Miocene delta13C excursion corresponding to the climatic optimum and subsequent expansion of the East Antarctic Ice Sheet. The six main delta13C maxima o...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.695122 2023-05-15T13:42:09+02:00 Middle Miocene isotope stratigraphy and paleoceanographic evolution of the northwest and southwest Australian margins (Wombat Plateau and Great Australian Bight) Holbourn, Ann E Kuhnt, Wolfgang Simo, J A Li, Qianyu MEDIAN LATITUDE: -25.128103 * MEDIAN LONGITUDE: 121.600138 * SOUTH-BOUND LATITUDE: -33.528730 * WEST-BOUND LONGITUDE: 115.535000 * NORTH-BOUND LATITUDE: -16.737000 * EAST-BOUND LONGITUDE: 128.066550 * DATE/TIME START: 1988-07-19T00:00:00 * DATE/TIME END: 1998-12-03T13:35:00 2004-05-30 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.695122 https://doi.org/10.1594/PANGAEA.695122 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.695122 https://doi.org/10.1594/PANGAEA.695122 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Holbourn, Ann E; Kuhnt, Wolfgang; Simo, J A; Li, Qianyu (2004): Middle Miocene isotope stratigraphy and paleoceanographic evolution of the northwest and southwest Australian margins (Wombat Plateau and Great Australian Bight). Palaeogeography, Palaeoclimatology, Palaeoecology, 208(1-2), 1-22, https://doi.org/10.1016/j.palaeo.2004.02.003 122-761 122-761B 182-1126B 182-1134A COMPCORE Composite Core DRILL Drilling/drill rig Great Australian Bight Joides Resolution Leg122 Leg182 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean Dataset 2004 ftpangaea https://doi.org/10.1594/PANGAEA.695122 https://doi.org/10.1016/j.palaeo.2004.02.003 2023-01-20T07:31:11Z The benthic stable isotope record from ODP Site 761 (Wombat Plateau, NW Australia, 2179.3 m water depth) documents complete recovery of the middle Miocene delta13C excursion corresponding to the climatic optimum and subsequent expansion of the East Antarctic Ice Sheet. The six main delta13C maxima of the „Monterey Excursion“ between 16.4 and 13.6 Ma and the characteristic stepped increase in delta18O between 14.5 and 13.9 Ma are clearly identified. The sedimentary record of the shallower ODP Sites 1126 and 1134 [Great Australian Bight (GAB), SWAustralia, 783.8 and 701 m water depth, respectively] is truncated by several unconformities. However, a composite benthic stable isotope curve for these sites provides a first middle Miocene bathyal record for southwest Australia. The delta18O and delta13C curves for Sites 1126 and 1134 indicate a cooler, better-ventilated water mass at ~700 m water depth in the Great Australian Bight since approximately 16 Ma. This cooler and younger water mass probably originated from a close southern source. Cooling of the bottom water at ~16 Ma started much earlier than at other sites of equivalent paleodepths in the central and western parts of the Indian Ocean. At Site 761, the delta18O curve shows an excellent match with the global sea level curve between ~11.5 and 15.1 Ma, and thus closely reflects changes in global ice volume. Prior to 15.1 Ma, the mismatch between the delta18O curve and the sea level curve indicates that delta18O fluctuations are mainly due to changes in bottom water temperature. Dataset Antarc* Antarctic Ice Sheet PANGAEA - Data Publisher for Earth & Environmental Science Antarctic East Antarctic Ice Sheet Indian ENVELOPE(115.535000,128.066550,-16.737000,-33.528730) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
122-761 122-761B 182-1126B 182-1134A COMPCORE Composite Core DRILL Drilling/drill rig Great Australian Bight Joides Resolution Leg122 Leg182 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean |
spellingShingle |
122-761 122-761B 182-1126B 182-1134A COMPCORE Composite Core DRILL Drilling/drill rig Great Australian Bight Joides Resolution Leg122 Leg182 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean Holbourn, Ann E Kuhnt, Wolfgang Simo, J A Li, Qianyu Middle Miocene isotope stratigraphy and paleoceanographic evolution of the northwest and southwest Australian margins (Wombat Plateau and Great Australian Bight) |
topic_facet |
122-761 122-761B 182-1126B 182-1134A COMPCORE Composite Core DRILL Drilling/drill rig Great Australian Bight Joides Resolution Leg122 Leg182 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean |
description |
The benthic stable isotope record from ODP Site 761 (Wombat Plateau, NW Australia, 2179.3 m water depth) documents complete recovery of the middle Miocene delta13C excursion corresponding to the climatic optimum and subsequent expansion of the East Antarctic Ice Sheet. The six main delta13C maxima of the „Monterey Excursion“ between 16.4 and 13.6 Ma and the characteristic stepped increase in delta18O between 14.5 and 13.9 Ma are clearly identified. The sedimentary record of the shallower ODP Sites 1126 and 1134 [Great Australian Bight (GAB), SWAustralia, 783.8 and 701 m water depth, respectively] is truncated by several unconformities. However, a composite benthic stable isotope curve for these sites provides a first middle Miocene bathyal record for southwest Australia. The delta18O and delta13C curves for Sites 1126 and 1134 indicate a cooler, better-ventilated water mass at ~700 m water depth in the Great Australian Bight since approximately 16 Ma. This cooler and younger water mass probably originated from a close southern source. Cooling of the bottom water at ~16 Ma started much earlier than at other sites of equivalent paleodepths in the central and western parts of the Indian Ocean. At Site 761, the delta18O curve shows an excellent match with the global sea level curve between ~11.5 and 15.1 Ma, and thus closely reflects changes in global ice volume. Prior to 15.1 Ma, the mismatch between the delta18O curve and the sea level curve indicates that delta18O fluctuations are mainly due to changes in bottom water temperature. |
format |
Dataset |
author |
Holbourn, Ann E Kuhnt, Wolfgang Simo, J A Li, Qianyu |
author_facet |
Holbourn, Ann E Kuhnt, Wolfgang Simo, J A Li, Qianyu |
author_sort |
Holbourn, Ann E |
title |
Middle Miocene isotope stratigraphy and paleoceanographic evolution of the northwest and southwest Australian margins (Wombat Plateau and Great Australian Bight) |
title_short |
Middle Miocene isotope stratigraphy and paleoceanographic evolution of the northwest and southwest Australian margins (Wombat Plateau and Great Australian Bight) |
title_full |
Middle Miocene isotope stratigraphy and paleoceanographic evolution of the northwest and southwest Australian margins (Wombat Plateau and Great Australian Bight) |
title_fullStr |
Middle Miocene isotope stratigraphy and paleoceanographic evolution of the northwest and southwest Australian margins (Wombat Plateau and Great Australian Bight) |
title_full_unstemmed |
Middle Miocene isotope stratigraphy and paleoceanographic evolution of the northwest and southwest Australian margins (Wombat Plateau and Great Australian Bight) |
title_sort |
middle miocene isotope stratigraphy and paleoceanographic evolution of the northwest and southwest australian margins (wombat plateau and great australian bight) |
publisher |
PANGAEA |
publishDate |
2004 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.695122 https://doi.org/10.1594/PANGAEA.695122 |
op_coverage |
MEDIAN LATITUDE: -25.128103 * MEDIAN LONGITUDE: 121.600138 * SOUTH-BOUND LATITUDE: -33.528730 * WEST-BOUND LONGITUDE: 115.535000 * NORTH-BOUND LATITUDE: -16.737000 * EAST-BOUND LONGITUDE: 128.066550 * DATE/TIME START: 1988-07-19T00:00:00 * DATE/TIME END: 1998-12-03T13:35:00 |
long_lat |
ENVELOPE(115.535000,128.066550,-16.737000,-33.528730) |
geographic |
Antarctic East Antarctic Ice Sheet Indian |
geographic_facet |
Antarctic East Antarctic Ice Sheet Indian |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_source |
Supplement to: Holbourn, Ann E; Kuhnt, Wolfgang; Simo, J A; Li, Qianyu (2004): Middle Miocene isotope stratigraphy and paleoceanographic evolution of the northwest and southwest Australian margins (Wombat Plateau and Great Australian Bight). Palaeogeography, Palaeoclimatology, Palaeoecology, 208(1-2), 1-22, https://doi.org/10.1016/j.palaeo.2004.02.003 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.695122 https://doi.org/10.1594/PANGAEA.695122 |
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.695122 https://doi.org/10.1016/j.palaeo.2004.02.003 |
_version_ |
1766163341114343424 |