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Geochemistry and tectonic setting of Tuting metavolcanic rocks of possible ophiolitic affinity from Eastern Himalayan syntaxis

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Journal of the Geological Society of India

Abstract

Geochemistry of Tuting metavolcanic rocks is being reported for the first time. Narrow slivers of mafic volcanic rocks, as those at Tuting, also occur in close association with slivers of more complete sections of ophiolites at the Tsangpo river section upstream of Tuting and skirt round the Namche Barwa antiform. These detached slivers of the mafic volcanic rocks and the ophiolites represent the easternmost components of the Yarlung Tsangpo Ophiolite, and also define the arcuate shape of the Eastern Himalayan syntaxis. The metavolcanic rocks exposed at the apex of the Siang river dome at Tuting (Tsangpo River named Siang down stream of Tuting) is the only exposure of such rocks from the Himalayan syntaxial area in India.

The Tuting metavolcanic rocks correspond to andesite and basaltic andesite as per TAS diagram. The mobility of major elements possibly has affected their classification. As per Zr/TiO2 — Nb/Y diagram of Winchester and Floyd (1977), proposed for classification of altered igneous rocks, the Tuting samples mainly correspond to ‘sub-akaline basalt’ and one sample plot as ‘andesite/basalt’. These have a flat chrondrite-normalised REE pattern. MORB-normalized multi-elemental plot shows enrichment in large ion lithophile (LIL) and the light rare earth elements (LREE), and depletion in several high field strength elements (HFSE). Based on these trace element patterns and a few discrimination plots, the Tuting metavolcanic rocks are inferred to have generated in supra-subduction zone environment in an intraoceanic arc, back arc setting, or in a mid-ocean ridge process that resembles the Chile Ridge spreading centre.

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Authors and Affiliations

  1. Department of Geology, ETL, University of Calcutta, 35, Ballygunge Circular Road, Kolkata, 700 019, India

    Puspendu Saha

  2. Department of Geological Sciences, Jadavpur University, Kolkata, 700 032, India

    S. K. Acharyya

  3. Geochemistry Division, CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad, 500 007, India

    V. Balaram & Parijat Roy

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  1. Puspendu Saha
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  2. S. K. Acharyya
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  3. V. Balaram
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  4. Parijat Roy
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Correspondence to S. K. Acharyya.

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Saha, P., Acharyya, S.K., Balaram, V. et al. Geochemistry and tectonic setting of Tuting metavolcanic rocks of possible ophiolitic affinity from Eastern Himalayan syntaxis. J Geol Soc India 80, 167–176 (2012). https://doi.org/10.1007/s12594-012-0129-5

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