Temporal changes in Quaternary paleoenvironment and ostracode fauna in the eastern Indian Sea off Western Australia (IODP, Exp. 356, site U1461)

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Author(s): Iwatani, Hokuto; Yasuhara, Moriaki; Angue Minto'o, Charlie Morelle; Bassetti, Maria-Angela
International Ocean Discovery Program, Expedition 356 Scientists
Author Affiliation(s): Primary:
University of Hong Kong, School of Biological Sciences, Hong Kong, China
University of Perpignan, France
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: The International Ocean Discovery Program Expedition 356 drilled on seven sites off Western Australia to reveal the history of the Indonesian throughflow, the effects of the Australian monsoon, and the subsidence of the northwest shelf of Australia. To achieve these objectives, we investigated paleoenvironmental evolutions in this region during the Quaternary period using high-resolution statistical analyses of the fossil Ostracoda (Crustacea) as an effective environmental indicator. For the investigation, we used a sediment core obtained from an area off Western Australia in the eastern Indian Sea (site: U1461; water depth: 128 m; latitude: 20°12.85'S; longitude: 115°03.94'E). The upper part of the core mainly comprises alternating beds of darker-colored packstone/wackestone and light-colored wackestone/mudstone. The light-colored wackestone/mudstone beds often contain fecal pellets and well-preserved molluscan fossils. We investigated fossil ostracode faunal composition and species diversity changes during the deposition of the study site. Many well-preserved ostracodes were recorded in the studied cores. Many of collected species are extant taxa that inhabit the upper sublittoral regions as reported from around the recent Indian Ocean off northwestern Australia. Ostracode assemblages, abundance, and diversity drastically changed during the deposition, and they are concordant with sedimentary facies. Here we will discuss the relationships between these paleo-communities changes and paleoenvironmental conditions.
Year of Publication: 2016
Research Program: IODP Integrated Ocean Drilling Program
IODP2 International Ocean Discovery Program
Key Words: 24 Surficial Geology, Quaternary Geology; Arthropoda; Cenozoic; Crustacea; Expedition 356; IODP Site U1461; Indian Ocean; International Ocean Discovery Program; Invertebrata; Mandibulata; Microfossils; Ostracoda; Paleoenvironment; Quaternary
Record ID: 2017051557
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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