Foraminiferal signatures of mass transport from the north-west continental shelf off Western Australia, IODP Expedition 356

Author(s): Mamo, B. L.; McHugh, C.; Renema, W.; Gallagher, S. J.; Fulthorpe, C.; Bogus, K.
Author Affiliation(s): Primary:
University of Hong Kong, Hong Kong, Hong-Kong
CUNY Queens College, Flushing, NY, United States
Naturalis Biodiversity Center, Leiden, Netherlands
University of Melbourne, Melbourne, Victoria, Australia
University of Texas at Austin, Austin, TX, United States
International Ocean Discovery Program, College Station, TX, United States
Volume Title: AGU 2017 fall meeting
Source: American Geophysical Union Fall Meeting, Vol.2017; American Geophysical Union 2017 fall meeting, New Orleans, LA, Dec. 11-15, 2017. Publisher: American Geophysical Union, Washington, DC, United States
Note: In English
Summary: In 2015, International Ocean Discovery Program Expedition 356 cored a transect along the margin off Western Australian 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 wherein an incredibly diverse benthic fauna (≈ 260 species) was used to reveal palaeo-water depth, palaeobathymetric setting and variable conditions at the sediment-water interface. Benthic foraminiferal biofacies are particularly sensitive to changes in environmental conditions, have a rapid turnover and are ideal proxies for monitoring physical and chemical changes in marine environments. When this information is combined with lithostratigraphic and other microfossil data, a robust understanding of past environments and past geological events can be reconstructed. Shipboard data were used to isolate horizons of interest for more intense sampling at Site U1461, situated on the Northwest Shelf (127 m water depth). The shipboard data revealed a large (≈150 m-thick) turbidite horizon hosting benthic foraminifera from a substantially shallower water depth than the horizon immediately preceding. We present preliminary foraminiferal results combined with shipboard sedimentological descriptions to better constrain the deposit's occurrence in the biostratigraphic record, use benthic foraminifera to elucidate the deposit's sedimentary origins and link this event with others in the region to investigate potential catalysts for its deposition.
Year of Publication: 2017
Research Program: IODP Integrated Ocean Drilling Program
IODP2 International Ocean Discovery Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Australasia; Australia; Cenozoic; Continental shelf; Expedition 356; Foraminifera; IODP Site U1461; Indonesian Seas; International Ocean Discovery Program; Microfossils; Pacific Ocean; Quaternary; Tertiary; West Pacific; Western Australia
Record ID: 2018074822
Copyright Information: GeoRef, Copyright 2018 American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States

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