Sm-Nd and Rb-Sr dating of amphibolite from the Nellore-Khammam schist belt, SE India: constraints on the collision of the Eastern Ghats terrane and Dharwar-Bastar craton

Authors
Okudaira, T Hamamoto, T Prasad, BH Kumar, R
Citation
T. Okudaira et al., Sm-Nd and Rb-Sr dating of amphibolite from the Nellore-Khammam schist belt, SE India: constraints on the collision of the Eastern Ghats terrane and Dharwar-Bastar craton, GEOL MAG, 138(4), 2001, pp. 495-498
Citations number
29
Categorie Soggetti
Earth Sciences
Journal title
GEOLOGICAL MAGAZINE
ISSN journal
00167568 → ACNP
Volume
138
Issue
4
Year of publication
2001
Pages
495 - 498
Database
ISI
SICI code
0016-7568(200107)138:4<495:SARDOA>2.0.ZU;2-F
Abstract
The Nellore-Khammam schist belt, SE India, is sandwiched in between the Pro terozoic Eastern Ghats terrane and the Archaean Dharwar-Bastar craton. We r eport Sm-Nd and Rb-Sr mineral isochron ages of amphibolite from the schist belt. The Sm-Nd and Rb-Sr ages are 824 +/- 43 Ma an 481 +/- 16 Ma, respecti vely. The Sm-Nd age indicates the timing of peak metamorphism, whereas the Rb-Sr age indicates the Pan-African thermal overprint. The peak metamorphis m was related to collision of the Eastern Ghats terrane with the Dharwar-Ba star craton, which occurred during early Neoproterozoic time.