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Nature of ophiolite occurrences along the eastern margin of the Indian plate and their tectonic significance

1990; Geological Society of America; Volume: 18; Issue: 5 Linguagem: Inglês

10.1130/0091-7613(1990)018 2.3.co;2

1943-2682

S. Sengupta, K.K. Ray, S.K. Acharyya, J.B. de Smeth,

Geological and Geophysical Studies Worldwide

Research Article| May 01, 1990 Nature of ophiolite occurrences along the eastern margin of the Indian plate and their tectonic significance S. Sengupta; S. Sengupta 1Geological Survey of India, Calcutta-700016, India Search for other works by this author on: GSW Google Scholar K. K. Ray; K. K. Ray 1Geological Survey of India, Calcutta-700016, India Search for other works by this author on: GSW Google Scholar S. K. Acharyya; S. K. Acharyya 1Geological Survey of India, Calcutta-700016, India Search for other works by this author on: GSW Google Scholar J. B. de Smeth J. B. de Smeth 2International Institute for Aerospace Survey and Earth Sciences, Kanaalweg 3, Netherlands Search for other works by this author on: GSW Google Scholar Geology (1990) 18 (5): 439–442. https://doi.org/10.1130/0091-7613(1990)018 2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation S. Sengupta, K. K. Ray, S. K. Acharyya, J. B. de Smeth; Nature of ophiolite occurrences along the eastern margin of the Indian plate and their tectonic significance. Geology 1990;; 18 (5): 439–442. doi: https://doi.org/10.1130/0091-7613(1990)018 2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Upper Mesozoic to lower Eocene ophiolitic rocks occur in two parallel belts along the eastern margin of the Indian plate. The eastern belt passes through central Burma, Sumatra, and Java, and coincides with a zone of gravity highs resulting from steeply dipping mafic rocks. It denotes the locus of the subduction where these ophiolites were accreted just prior to middle Eocene time. In contrast, the western belt, which passes through Nagaland, Manipur, western Burma, and Andaman, is flanked to the east by a negative gravity anomaly zone. In it the ophiolites occur as rootless, subhorizontal bodies, tectonically overlying Eocene-Oligocene flysch sedimentary rocks. They are inferred to be nappes that propagated westward from the eastern belt during late Oligocene terminal collision of the Indian and Eurasian continental blocks.Ophiolite occurrences in Andaman and Mentawai islands belonging to the western belt are generally linked with active subduction west of the island arc. This subduction began only in late Miocene time, and thus it could not have produced the ophiolites, which had been emplaced on land much earlier. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.