Eclogitic metasediments from the Tso Morari area (Ladakh, Himalaya): evidence for continental subduction during India-Asia convergence |
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| Authors: | S Guillot J de Sigoyer J M Lardeaux G Mascle |
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| Institution: | (1) Laboratoire de pétrologie et Tectonique – CNRS UMR 5570 – UCBL and ENSL, 27-43 bd du II November, F-69622 Villeurbanne, France, FR;(2) Laboratoire de Geodynamique des Chatnes Alpines – CNRS UPRS129-UJF, 15 rue M. Gignoux, F-38000 Grenoble, France, FR |
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| Abstract: | Metasediments in the Tso Morari area (Ladakh, Himalaya) provide new insights into the Higher Himalayan metamorphism in the
northwestern part of the Himalayan belt. Whole-rock analyses and petrologic observations show that the metasediments correspond
to Fe-rich metapelites, Mg-rich metapelites, intermediate metapelites and metagreywackes of the Indian continental margin.
Jadeite + chloritoid + paragonite + garnet in the Fe-rich metapelites indicate pressures of 20 ±2 kbar at temperatures of
550 ±50 °C according to major element partitioning thermobarometry, stability fields of minerals and Thermocalc P-T estimates. These results are consistent with P-T estimates on other metasediments and with the occurrence of eclogites. Subsequent retrogression at the eclogite-blueschist
facies transition (from 18 to 13 kbar and 540 ±50 °C) was followed by an increase in temperature to 630 ±30 °C at amphibolite
facies conditions. The metamorphic evolution is related to subduction of the Indian continental margin beneath the southern
Asian margin at the onset of the Indian-Eurasian collision.
Received: 17 April 1996 / Accepted: 19 February 1997 |
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