Palaeobathymetric interpretations using foraminiferal data from the north-west continental shelf off Western Australia, IODP expedition 356

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Author(s): Mamo, Briony L.; Renema, Willem; Auer, Gerald; Groeneveld, Jeroen; Gallagher, Stephen J.; Fulthorpe, Craig; Bogus, Kara
International Ocean Discovery Program, Expedition 356 Scientists
Author Affiliation(s): Primary:
University of Hong Kong, Hong Kong, China
Naturalis Biodiversity Center, Netherlands
University of Graz, Austria
University of Bremen, Germany
University of Melbourne, Australia
University of Texas at Austin, United States
International Ocean Discovery Program, United States
Texas A&M University College Station, United States
Volume Title: AGU 2016 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2016; American Geophysical Union 2016 fall meeting, San Francisco, CA, Dec. 12-16, 2016. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: In 2015, Integrated Ocean Discovery Program Expedition 356 drilled along the passive margin off the West Australian coast to investigate the history of the Indonesian Throughflow (ITF) and its integral role in the development of global thermohaline circulation and climate. Throughout the expedition, a suite of foraminiferal analyses were employed to assess stratigraphy and benthic environments. Planktic foraminifera were primarily used for biostratigraphy and an incredibly diverse benthic fauna (∼260 species) yielded information regarding palaeobathymetric settings and variable conditions at the sediment-water interface. Benthic foraminiferal biofacies are particularly sensitive to changes in environmental conditions and have rapid turnover making them ideal proxies for monitoring physical and chemical changes in marine environments. When these data are combined with a multi-proxy approach incorporating lithostratigraphic and other microfossil data, a robust understanding of past environments can be realised. Stretching from the Northern Carnarvon Basin north to the Roebuck Basin, several distinct biofacies were isolated at sites U1461-U1464 that reveal an array of marine settings and events that span from the Miocene through to the Pleistocene. These features include water depths ranging from Miocene shallows (including larger benthic foraminifera) to Pliocene bathyal depths (∼1000 m), the occurrence of key indicator species for both the Leeuwin Current and the West Pacific Warm Pool (Asterorotalia and Pseudorotalia), and episodes of downslope sediment transport. Here we present the main isolated biofacies, their associated lithofacies and their implications for reconstructing fluctuating sea-level, thermohaline circulation and sediment transport in a changing marine landscape.
Year of Publication: 2016
Research Program: IODP2 International Ocean Discovery Program
Key Words: 24 Surficial Geology, Quaternary Geology; Bathymetry; Expedition 356; Foraminifera; Indian Ocean; International Ocean Discovery Program; Invertebrata; Microfossils; Paleo-oceanography; Protista
Record ID: 2017051559
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States

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