Gallagher, Stephen John; Wallace, Malcolm W; Li, Chung Leong; Kinna, Belinda; Bye, John A T; Akimoto, Kazumi; Torii, Masayuki (2009): Benthic foraminiferal abundances from eight sites of the Northwest Australian shelf [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.758377, Supplement to: Gallagher, SJ et al. (2009): Neogene history of the West Pacific Warm Pool, Kuroshio and Leeuwin currents. Paleoceanography, 24, PA1206, https://doi.org/10.1029/2008PA001660
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Abstract:
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.
Coverage:
Median Latitude: -20.084750 * Median Longitude: 115.557125 * South-bound Latitude: -20.561000 * West-bound Longitude: 115.036000 * North-bound Latitude: -19.286000 * East-bound Longitude: 116.641000
Minimum DEPTH, sediment/rock: 97.5 m * Maximum DEPTH, sediment/rock: 1156.7 m
Event(s):
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 3 | AGE | Age | ka BP | Geocode | ||
| 4 | Foraminifera | Foram | # | Gallagher, Stephen John | Counting | |
| 5 | Foraminifera, per unit sediment mass | Foram/sed | #/g | Gallagher, Stephen John | Counting | dry sediment mass |
| 6 | Plankton | Plank | # | Gallagher, Stephen John | Counting | |
| 7 | Plankton | Plankt | % | Gallagher, Stephen John | Counting | |
| 8 | Foraminifera, benthic | Foram benth | # | Gallagher, Stephen John | Counting, foraminifera, benthic | Rotaliids |
| 9 | Asterorotalia concinna | A. concinna | % | Gallagher, Stephen John | Counting, foraminifera, benthic | |
| 10 | Asterorotalia gaimardii | A. gaimardii | % | Gallagher, Stephen John | Counting, foraminifera, benthic | |
| 11 | Asterorotalia milletti | A. milletti | % | Gallagher, Stephen John | Counting, foraminifera, benthic | |
| 12 | Asterorotalia sp. | Asterorotalia sp. | % | Gallagher, Stephen John | Counting, foraminifera, benthic | |
| 13 | Foraminifera | Foram | % | Gallagher, Stephen John | Counting, foraminifera, benthic | total percent of Asterorotalia |
| 14 | Pseudorotalia schroeteriana | P. schroeteriana | % | Gallagher, Stephen John | Counting, foraminifera, benthic | |
| 15 | Pseudorotalia indopacifica | P. indopacifica | % | Gallagher, Stephen John | Counting, foraminifera, benthic | |
| 16 | Pseudorotalia globosa | P. globosa | % | Gallagher, Stephen John | Counting, foraminifera, benthic | |
| 17 | Pseudorotalia angusta | P. angusta | % | Gallagher, Stephen John | Counting, foraminifera, benthic | |
| 18 | Foraminifera | Foram | % | Gallagher, Stephen John | Counting, foraminifera, benthic | total percent of Pseudorotalia |
| 19 | Assilina ammonoides | A. ammonoides | % | Gallagher, Stephen John | Counting, foraminifera, benthic | |
| 20 | Nummulites venosa | N. venosa | % | Gallagher, Stephen John | Counting, foraminifera, benthic | |
| 21 | Heterolepa margaritifera | H. margaritifera | % | Gallagher, Stephen John | Counting, foraminifera, benthic | |
| 22 | Foraminifera | Foram | % | Gallagher, Stephen John | Counting, foraminifera, benthic | percent larger Foraminifera |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
1254 data points