Clark, G. S. ; Subbarao, K. V. (1971) Rb-Sr isotopic age of the Kunavaram series-a group of alkaline rocks from India Canadian Journal of Earth Sciences, 8 (12). pp. 1597-1602. ISSN 0008-4077
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Official URL: http://www.nrcresearchpress.com/doi/abs/10.1139/e7...
Related URL: http://dx.doi.org/10.1139/e71-148
Abstract
A Rb-Sr isochron age of 1265±85 m.y. has been obtained for a group of alkaline rocks (Kunavaram series) which intrude highly folded, metamorphosed igneous and sedimentary rocks of the Eastern Ghats belt of South India. The initial 87Sr/86Sr ratio is 0.7051±0.0013. This age is believed to be the time of intrusion of these rocks. Assuming an initial ratio of 0.710, two mica samples from the nepheline syenite (a biotite and a muscovite) gave an age of 620 m.y. One sample of the country rock (garnet-biotite gneiss) gave an age of 2100 m.y., which agrees with prior estimates for the age of the principal orogenic activity in the Eastern Ghats belt.
| Item Type: | Article |
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| Source: | Copyright of this article belongs to NRC Research Press. |
| ID Code: | 51289 |
| Deposited On: | 28 Jul 2011 07:11 |
| Last Modified: | 28 Jul 2011 07:11 |
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