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Rb−Sr age of Gaik granite, Ladakh batholith, northwest Himalaya

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Abstract

The Gaik Granite is a part of the Ladakh batholith outcropping between Gaik and Kiari in NW Himalaya. This is a pink porphyritic granite rich in biotite and poor in hornblende. Rb-Sr analyses have been made on six whole-rock samples of the Gaik Granite. Though the samples are poorly enriched in radiogenic Sr, they define a reliable isochron corresponding to an age of 235±13 (2σ) m.y. and initial87Sr/86Sr ratio of 0·7081±0·0004 (2σ). Biotite, plagioclase and potash feldspar fractions separated from two of the samples have yielded a much younger mineral isochron at 30±1·5 m.y. indicating a nearly complete redistribution of Sr isotopes between mineral phases at a time much later than the primary emplacement of the granite. The present results show that at least some components of the Ladakh batholith are of Permo-Triassic age. These rocks were isotopically re-equilibrated on a mineral scale during Upper Oligocene in response to the Himalayan orogeny.

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Authors and Affiliations

  1. Physical Research Laboratory, 380 009, Ahmedabad, India

    J R Trivedi & K Gopalan

  2. Wadia Institute of Himalayan Geology, 248 001, Dehra Dun, India

    Kewal Kisharma, K R Gupta & V M Choubey

Authors
  1. J R Trivedi
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  2. K Gopalan
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  3. Kewal Kisharma
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  4. K R Gupta
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  5. V M Choubey
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Trivedi, J.R., Gopalan, K., Kisharma, K. et al. Rb−Sr age of Gaik granite, Ladakh batholith, northwest Himalaya. Proc. Indian Acad. Sci. (Earth Planet. Sci.) 91, 65–73 (1982). https://doi.org/10.1007/BF03028028

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  • DOI: https://doi.org/10.1007/BF03028028

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