Rb-Sr Geochronology of the Ambalavayal Granite, Kerala

Authors

  • M. Santosh
     Centre for Earth Science Studies, P. B. 2235, Sasthamangalam, Trivandrum 695 010
  • N. G. K. Nair
     Centre for Earth Science Studies, P. B. 2235, Sasthamangalam, Trivandrum 695 010
  • K. Pande
     Physical Research Laboratory, Navarangpura, Ahmedabad 380 009
  • K. Gopalan
     Physical Research Laboratory, Navarangpura, Ahmedabad 380 009

Abstract

Rubidium and strontium determinations are reported for seven whole-rock samples of the Ambalavayal granite of northern Kerala. The data yield a well defined Rb-Sr isochron, corresponding to an age of 595 ± 20 Ma and initial 87Sr/86Sr ratio of 0.7171 ± 0.0022. The age marks a regime of Late Precambrian-Early Palaeozoic granite magmatism in the southwestern Indian shield. The agreement of the Rb/Sr age with the previously measured K/Ar age of 560± 30 Ma indicates no significant secondary thermal event in the region. The evolved initial Sr ratio suggests either an exclusive origin or significant crustal contamination of magma derived from a deeper source.

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Issue

Volume 27, Issue 3, March 1986

Section

Research Notes

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Published

1986-03-01

How to Cite

Santosh, M., Nair, N. G. K., Pande, K., & Gopalan, K. (1986). Rb-Sr Geochronology of the Ambalavayal Granite, Kerala. Journal of Geological Society of India, 27(3), 309–312. Retrieved from https://geosocindia.com/index.php/jgsi/article/view/65686

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