3.56 Ga tonalite in the central part of the Bastar Craton, India: oldest Indian date
Abstract
The lack of information regarding Early Achaean rocks from the Indian Peninsula is mainly due to the absence of high-quality U-Pb zircon ages. A tonalite sample from the TTG gneiss-supracrustal association from the central part of the Bastar craton in central India is dated at 3.56 Ga. This is the oldest protolith age so far recorded from India. These TTG gneisses have enclaves of metasedimentary and metavolcanic rocks that may provide important information on the first-billion year history of the Indian craton. This new date for tonalite from the Bastar craton is the first precise U-Pb zircon age from India's first U-Pb geochronology laboratory, located at the Geological Survey of India which hopefully will remedy the paucity of good geochronological data for older rocks of the Indian peninsula.
- Publication:
-
Journal of Asian Earth Sciences
- Pub Date:
- July 2004
- DOI:
- 10.1016/S1367-9120(03)00136-6
- Bibcode:
- 2004JAESc..23..359G