Indian continental crust recovered from Elan Bank, Kerguelen Plateau (ODP Leg 183, Site 1137)

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doi: 10.1093/petrology/43.7.1241
Author(s): Ingle, S.; Weis, Dominique; Frey, Frederick A.
Author Affiliation(s): Primary:
Université Libre de Bruxelles, Departement des Sciences de la Terre et de l'Environnement, Brussels, Belgium
Other:
Massachusetts Institute of Technology, United States
Volume Title: Journal of Petrology
Source: Journal of Petrology, 43(7), p.1241-1257. Publisher: Oxford University Press, Oxford, United Kingdom. ISSN: 0022-3530 CODEN: JPTGAD
Note: In English. 70 refs.; illus., incl. 3 tables, sketch maps
Summary: Clasts from a fluvial conglomerate intercalated with subaerially erupted tholeiitic basalt flows on the Elan Bank, Indian Ocean, include alkali basalt, rhyolite, trachyte, granitic and garnet-biotite gneiss. Geochemically, the gneiss clasts show affinity with rocks of the Eastern Ghats (India) and its East Antarctic corollary, the Rayner complex. The felsic volcanic clasts are not genetically related to the intercalated basalts and probably formed from melting of evolved upper continental crust, as did the granitic rocks. The alkali basalt (tephrite to phonotephrite) clasts have a distinct petrogenesis from the tholeiitic flow units, despite some isotopic similarities between the two volcanic rocks. Clearly, rocks of continental origin are present at shallow depths in the Cretaceous Kerguelen Plateau. Major, trace, REE and Sr, Nd and Pb isotopic analyses of the above clasts are listed.
Year of Publication: 2002
Research Program: ODP Ocean Drilling Program
Key Words: 05 Petrology, Igneous and Metamorphic; Asia; Basalts; Continental crust; Crust; Eastern Ghats; Elan Bank; Ghats; Gneisses; Igneous rocks; India; Indian Ocean; Indian Peninsula; Kerguelen Plateau; Leg 183; Metamorphic rocks; ODP Site 1137; Ocean Drilling Program; Partial melting; Rayner Complex; Tholeiitic basalt; Volcanic rocks
Coordinates: S565000 S565000 E0680536 E0680536
Record ID: 2003010534
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom