Plate tectonics 2.5 billion years ago - Evidence at Kolar, south India

Details Plate tectonics 2.5 billion years ago - Evidence at Kolar, south India Plate tectonics 2.5 billion years ago - Evidence at Kolar, south India

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989sci...243.1337k&link_type=abstract

Science (ISSN 0036-8075), vol. 243, March 10, 1989, p. 1337-1340.

Computer Science

17

Geochronology, Planetary Evolution, Plates (Tectonics), Tectonics, Earth Mantle, Geochemistry, Gneiss, India, Planetary Composition, Schist

Scientific paper

The Archean Kolar Schist Belt, south India, is a suture zone where two gneiss terranes and at least two amphibolite terranes with distinct histories were accreted. Amphibolites from the eastern and western sides of the schist belt have distinct incompatible element and isotopic characteristics suggesting that their volcanic protoliths were derived from different mantle sources. The amphibolite and gneiss terranes were juxtaposed by horizontal compression and shearing between 2530 and 2420 million years ago (Ma) along a zone marked by the Kolar Schist Belt. This history of accretion of discrete crustal terranes resembles those of Phanerozoic convergent margins and thus suggests that plate tectonics operated on earth by 2500 Ma.

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