Sedimentation in the Indian Ocean through time

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doi: 10.1029/SP009p0061
Author(s): Davies, T. A.; Kidd, R. B.
Author Affiliation(s): Primary:
Middlebury Coll., Dep. Geol., Middlebury, Vt., United States
Volume Title: Indian Ocean geology and biostratigraphy; studies following Deep-Sea Drilling legs 22-29
Volume Author(s): Heirtzler, J. R., editor; Bolli, H. M.; Davies, T. A.; Saunders, J. B.; Sclater, J. G.
Source: Indian Ocean geology and biostratigraphy; studies following Deep-Sea Drilling legs 22-29, edited by J. R. Heirtzler, H. M. Bolli, T. A. Davies, J. B. Saunders and J. G. Sclater, p.61-85. Publisher: Am. Geophys. Union, Washington, D.C., United States. ISBN: 978-1-118-66491-9
Note: In English. 28 refs.; illus. incl. sketch maps
Summary: The nature and distribution of the Mesozoic and Cenozoic sediments of the Indian Ocean, as revealed by deep-sea drilling, are summarized and paleobathymetric reconstructions are used to show probable patterns of sedimentation in Late Cretaceous, Early Eocene and Early Oligocène times. Mesozoic sedimentation was characterized by relatively rapid accumulation of clays in the restricted Wharton and Mozambique basins. Calcareous and terrigenous sediments accumulated around the margins of these basins. In the early Tertiary more open conditions prevailed, but tectonic activity and changing bottom circulation have resulted in a patchy and discontinuous record, especially in the Eocene and early Oligocene. Oligocene to Recent patterns of sedimentation closely resemble those of the present day. Accumulations of terrigenous sediment in the western and northern parts of the Indian Ocean are clearly related to tectonic activity in the neighboring land areas, and there is a sharp distinction between ocean basins with abundant terrigenous sediment input (Mozambique, Mascarene, Arabian, Somali, northern Central Indian) and those without (South Central Indian, Wharton). Hiatuses in the early Tertiary sedimentary record can be related to changing patterns of bottom circulation associate with glaciation in Antarctica and the subsequent development of strong bottom circulation. The pattern of bottom circulation changed with the development of the present circumpolar circulation, permitting sedimentation to resume in many places. Abstract Copyright (1977), by the American Geophysical Union.
Year of Publication: 1977
Research Program: DSDP Deep Sea Drilling Project
Key Words: 07 Marine Geology and Oceanography; Calcareous composition; Carbonate compensation depth; Cenozoic; Clastic sediments; Deep Sea Drilling Project; Distribution; Environment; Indian Ocean; Marine transport; Mesozoic; Mozambique Basin; Ocean circulation; Oceanography; Paleo-oceanography; Reconstruction; Sedimentation; Sediments; Transport; Wharton Basin
Record ID: 1978039300
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.

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