Emplacement and subsidence of Indian Ocean plateaus and submarine ridges

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doi: 10.1029/GM070p0115
Author(s): Coffin, Millard F.
Author Affiliation(s): Primary:
University of Texas at Austin, Institute for Geophysics, Austin, TX, United States
Other:
University of Michigan, United States
University of Wales College of Cardiff, United Kingdom
Bundesanstalt für Geowissenschaften und Rohstoffe, Federal Republic of Germany
Lamont-Doherty Geological Observatory of Columbia University, United States
Volume Title: Synthesis of results from scientific drilling in the Indian Ocean
Volume Author(s): Duncan, Robert A., editor; Rea, David K.; Kidd, Robert B.; von Rad, Ulrich; Weissel, Jeffrey K.
Source: Synthesis of results from scientific drilling in the Indian Ocean, edited by Robert A. Duncan, David K. Rea, Robert B. Kidd, Ulrich von Rad and Jeffrey K. Weissel. Geophysical Monograph, Vol.70, p.115-125. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0065-8448. ISBN: 978-1-118-66803-0 CODEN: GPMGAD
Note: In English. 62 refs.; illus., incl. 5 tables, sketch map
Summary: Borehole results from Indian Ocean plateaus and submarine ridges help to constrain their subsidence histories. The author uses a simple Airy isostatic model to calculate basement depths at ODP sites in the absence of sediment, and then backtracks these sites using previously determined age-depth relationships for oceanic lithosphere to determine the original depth or elevation of the sites. Resulting subsidence curves for each site are then checked by examining sedimentologic and biostratigraphic evidence for when each site subsided below shelf depths. The analysis suggests that thermal subsidence has been the dominant tectonic process affecting Indian Ocean plateaus and submarine ridges following emplacement. It is concluded that large portions of these features were emplaced and began subsiding well above sea level, similar to large igneous provinces (LIPs) worldwide today. This resulted in significant subaerial erosion and redeposition of volcanic material mixed with biogenic sediment, and a gradual development of facies from terrestrial through terrigeneous to shallow water and pelagic, resulting in a sedimentary record with both continental and oceanic characteristics. (Auth.)
Year of Publication: 1992
Research Program: ODP Ocean Drilling Program
Key Words: 18 Geophysics, Solid-Earth; Basalts; Basement; Cooling; Flood basalts; Igneous rocks; Indian Ocean; Intrusions; Isostasy; Large igneous provinces; Mid-ocean ridges; Ocean Drilling Program; Ocean floors; Plateaus; Processes; Subsidence; Tectonics; Volcanic rocks
Record ID: 2007093158
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from the Antarctic Bibliography, United States

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