Zachariasse, Willem-Jan (1992): Neogene planktonic foraminifers from Wombat and Exmouth Plateau [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.729255, Supplement to: Zachariasse, W-J (1992): Neogene planktonic foraminifers from sites 761 and 762 off Northwest Australia. In: von Rad, U; Haq, BU; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 122, 665-675, https://doi.org/10.2973/odp.proc.sr.122.190.1992
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Abstract:
Diverse, warm-water planktonic foraminiferal faunas prevailed on the Wombat and Exmouth plateaus during the Neogene, in spite of the northward drift of Australia across 10° to 15° latitude since the early Miocene. Invasions of cool-water species occurred during periods of global cooling in the late middle Miocene, late Miocene, and Pleistocene, and reflect periods of increased northward transport of cool surface water, probably via the West Australian Current.
The sedimentary record of the Neogene on Wombat and Exmouth Plateau is interrupted by two hiatuses (lower Miocene, Zone N5, and upper middle to upper Miocene, Zones N15-N17), and one redeposited section of upper Miocene to uppermost Pliocene sediments. Mechanical erosion or nondeposition by increased deep-water flow or tilting and uplift of Wombat and Exmouth plateaus, resulting in sediment shedding, are the most likely explanations for these Miocene hiatuses, but which of these processes were actually operative on the Wombat and Exmouth plateaus is uncertain. The redeposited section of upper Miocene to uppermost Pliocene sediments in Hole 761B, however, certainly reflects a latest Pliocene period of uplift and tilting of the Wombat Plateau.
An important finding was the occurrence of Zone N15-correlative sediments in Hole 762B without any representative of Neogloboquadrina. Similar findings in Java and Jamaica indicate that the earliest spreading of Neogloboquadrina acostaensis in the tropical region resulted from migration. The evolution of this species, therefore, must have taken place in higher latitudes. I suggest that Neogloboquadrina acostaensis evolved from Neogloboquadrina atlantica in the North Atlantic within Zone NN9, but how and where in the region this speciation took place is still uncertain
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -18.312000 * Median Longitude: 113.894500 * South-bound Latitude: -19.887000 * West-bound Longitude: 112.254000 * North-bound Latitude: -16.737000 * East-bound Longitude: 115.535000
Date/Time Start: 1988-07-19T10:00:00 * Date/Time End: 1988-07-27T03:25:00
Event(s):
122-761B * Latitude: -16.737000 * Longitude: 115.535000 * Date/Time Start: 1988-07-19T10:00:00 * Date/Time End: 1988-07-21T09:00:00 * Elevation: -2179.0 m * Penetration: 286.7 m * Recovery: 199.08 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg122 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 33 cores; 286.7 m cored; 0 m drilled; 69.4 % recovery
122-762B * Latitude: -19.887000 * Longitude: 112.254000 * Date/Time Start: 1988-07-26T11:00:00 * Date/Time End: 1988-07-27T03:25:00 * Elevation: -1371.0 m * Penetration: 175.4 m * Recovery: 174.9 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg122 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 19 cores; 175.4 m cored; 0 m drilled; 99.7 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Zachariasse, W-J (1992): (Figure 3) Stratigraphic distribution of planktonic foraminifera in the Neogene of ODP Hole 122-761B. https://doi.org/10.1594/PANGAEA.729253
- Zachariasse, W-J (1992): (Figure 2) Stratigraphic distribution of planktonic foraminifera in the Neogene of ODP Hole 122-762B. https://doi.org/10.1594/PANGAEA.729252