Pleistocene aragonite cycles and trace element analysis of basinal drift deposits from the inner sea of the Maldives

Online Access: Get full text
doi: 10.1130/abs/2016AM-286918
Author(s): Mohammadi, Obeyd; Guo, Junhua
International Ocean Discovery Program, Expedition 359 Scientists, College Station, TX
Author Affiliation(s): Primary:
California State University at Bakersfield, Department of Geological Sciences, Bakersfield, CA, United States
Volume Title: Geological Society of America, 2016 annual meeting & exposition
Source: Abstracts with Programs - Geological Society of America, 48(7); Geological Society of America, 2016 annual meeting & exposition, Denver, CO, Sept. 25-28, 2016. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0016-7592 CODEN: GAAPBC
Note: In English
Summary: The Inner Sea of the Maldives is an isolated bank-internal basin in the Indo-Pacific with significant archival potential for climate-driven sedimentation. In this study, high-resolution bulk sediment data of drift deposits from basinal site U1467B of Expedition 359 of the International Ocean Discovery Program (IODP) were profiled via standard X-ray powder diffraction (XRD) methods for their aragonite content. Preliminary results reveal cyclic variations in aragonite content over depth and fluctuations in calcite and dolomite over a core encompassing 100 mbsf. Downcore peak intensity variations between primary carbonate minerals probably originate via episodic sea-level fluctuations whereby Maldivan carbonate platforms were overprinted by sea-level highstands. Spatial content distributions of detrital quartz and terrigenous sediments in analogue carbonate drift basins have been linked to regional glacial and interglacial periods (South Asian Monsoon). Hence, the ongoing downcore analysis of these sediments via XRD and major and trace elements via XRF and ICP-MS techniques may therefore constrain the timing and duration of mixed carbonate-siliclastic depositional successions and lend insight into the wider oceanographic paleoconditions of the Western Indo-Pacific realm.
Year of Publication: 2016
Research Program: IODP Integrated Ocean Drilling Program
IODP2 International Ocean Discovery Program
Key Words: 02 Geochemistry; 21 Hydrogeology and Hydrology; Carbonates; Cenozoic; Chemical composition; Expedition 359; IODP Site U1467; Indian Ocean; Inner Sea of the Maldives; International Ocean Discovery Program; Marine environment; Marine sediments; Paleo-oceanography; Paleoenvironment; Pleistocene; Quaternary; Sea-level changes; Sediments; Trace elements; X-ray diffraction data
Coordinates: N045101 N045103 E0731702 E0731701
Record ID: 2017017041
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States