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| Main Authors: | , , , , , , |
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| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
2009
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| Subjects: | |
| Online Access: | https://doi.org/10.1594/PANGAEA.758377 |
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| _version_ | 1867169035905400832 |
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| author | Gallagher, Stephen John Wallace, Malcolm W Li, Chung Leong Kinna, Belinda Bye, John A T Akimoto, Kazumi Torii, Masayuki |
| author_facet | Gallagher, Stephen John Wallace, Malcolm W Li, Chung Leong Kinna, Belinda Bye, John A T Akimoto, Kazumi Torii, Masayuki |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Foraminiferal analysis of Miocene to recent strata of the Northwest Shelf of Australia is used to chart West Pacific Warm Pool (WPWP) influence. The assemblage is typified by "larger" foraminifera with ingressions of the Indo-Pacific "smaller" taxa Asterorotalia and Pseudorotalia at around 4 Ma and from 1.6 to 0.8 Ma. A review of recent and fossil biogeography of these taxa suggests their stratigraphic distribution can be used to document WPWP evolution. From 10 to 4.4 Ma a lack of biogeographic connectivity between the Pacific and Indian Ocean suggests Indonesian Throughflow (ITF) restriction. During this period, the collision of Australia and Asia trapped warmer waters in the Pacific, creating a central WPWP biogeographic province from the equator to 26°N. By 3 Ma Indo-Pacific species migrated to Japan with the initiation of the "modern" Kuroshio Current coinciding with the intensification of the North Pacific Gyre and Northern Hemisphere ice sheet expansion. Indo-Pacific taxa migrated to the northwest Australia from 4.4 to 4 Ma possibly because of limited ITF. The absence of Indo-Pacific taxa in northwest Australia indicates possible ITF restriction from 4 to 1.6 Ma. Full northwest Australian biogeographic connectivity with the WPWP from 1.6 to 0.8 Ma suggests an unrestricted stronger ITF (compared to today) and the initiation of the modern Leeuwin Current. The extinction of some Indo-Pacific species in northwest Australia after 0.8 Ma may be related to the effects of large glacial/interglacial oscillations and uplift of the Indonesian Archipelago causing Indonesian seaway restriction. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_758377 |
| institution | PANGAEA |
| language | en |
| publishDate | 2009 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Benthic foraminiferal abundances from eight sites of the Northwest Australian shelf Gallagher, Stephen John Wallace, Malcolm W Li, Chung Leong Kinna, Belinda Bye, John A T Akimoto, Kazumi Torii, Masayuki AGE; Assilina ammonoides; Asterorotalia concinna; Asterorotalia gaimardii; Asterorotalia milletti; Asterorotalia sp.; Austin-1; Bounty-1; Counting; Counting, foraminifera, benthic; DEPTH, sediment/rock; Event label; Foraminifera; Foraminifera, benthic; Foraminifera, per unit sediment mass; Goodwyn-6; Goodwyn-7; Heterolepa margaritifera; Maitland-1; Matiland_North-1; North west Australian continental margin; Nummulites venosa; Plankton; Pseudorotalia angusta; Pseudorotalia globosa; Pseudorotalia indopacifica; Pseudorotalia schroeteriana; Tryal_Rocks-1; West_Tryal_Rocks-1 Foraminiferal analysis of Miocene to recent strata of the Northwest Shelf of Australia is used to chart West Pacific Warm Pool (WPWP) influence. The assemblage is typified by "larger" foraminifera with ingressions of the Indo-Pacific "smaller" taxa Asterorotalia and Pseudorotalia at around 4 Ma and from 1.6 to 0.8 Ma. A review of recent and fossil biogeography of these taxa suggests their stratigraphic distribution can be used to document WPWP evolution. From 10 to 4.4 Ma a lack of biogeographic connectivity between the Pacific and Indian Ocean suggests Indonesian Throughflow (ITF) restriction. During this period, the collision of Australia and Asia trapped warmer waters in the Pacific, creating a central WPWP biogeographic province from the equator to 26°N. By 3 Ma Indo-Pacific species migrated to Japan with the initiation of the "modern" Kuroshio Current coinciding with the intensification of the North Pacific Gyre and Northern Hemisphere ice sheet expansion. Indo-Pacific taxa migrated to the northwest Australia from 4.4 to 4 Ma possibly because of limited ITF. The absence of Indo-Pacific taxa in northwest Australia indicates possible ITF restriction from 4 to 1.6 Ma. Full northwest Australian biogeographic connectivity with the WPWP from 1.6 to 0.8 Ma suggests an unrestricted stronger ITF (compared to today) and the initiation of the modern Leeuwin Current. The extinction of some Indo-Pacific species in northwest Australia after 0.8 Ma may be related to the effects of large glacial/interglacial oscillations and uplift of the Indonesian Archipelago causing Indonesian seaway restriction. |
| title | Benthic foraminiferal abundances from eight sites of the Northwest Australian shelf |
| topic | AGE; Assilina ammonoides; Asterorotalia concinna; Asterorotalia gaimardii; Asterorotalia milletti; Asterorotalia sp.; Austin-1; Bounty-1; Counting; Counting, foraminifera, benthic; DEPTH, sediment/rock; Event label; Foraminifera; Foraminifera, benthic; Foraminifera, per unit sediment mass; Goodwyn-6; Goodwyn-7; Heterolepa margaritifera; Maitland-1; Matiland_North-1; North west Australian continental margin; Nummulites venosa; Plankton; Pseudorotalia angusta; Pseudorotalia globosa; Pseudorotalia indopacifica; Pseudorotalia schroeteriana; Tryal_Rocks-1; West_Tryal_Rocks-1 |
| url | https://doi.org/10.1594/PANGAEA.758377 |