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Nelson, D. R.
- Further Zircon U-Pb Age Data for the Daginkatte Formation, Dharwar Supergroup, Karnataka Craton
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Authors
Affiliations
1 School of Physical Sciences, Curtin University of Technology, GPO Box 1987, Perth 6000, Western Australia, AU
2 Geological Survey of Western Australia, Mineral House, I Plain Street, East Perth 6004, Western Australia, AU
3 National Geophysical Research Institute, Hyderabad 500 007, IN
1 School of Physical Sciences, Curtin University of Technology, GPO Box 1987, Perth 6000, Western Australia, AU
2 Geological Survey of Western Australia, Mineral House, I Plain Street, East Perth 6004, Western Australia, AU
3 National Geophysical Research Institute, Hyderabad 500 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 50, No 1 (1997), Pagination: 25-30Abstract
SHRIMP U-Pb analyses of zircons from a rhyolite sample collected from the Daginkatte Formation of the Chitradurga Group (Dharwar Supergroup), close to the type locality, give an age of 2601 ± 6 Ma (1σ 23 of 24 analysed grains). This is within error of the 2614 ± 8 Ma (2σ 11 grains) recently reported by A.P. Nutman and his colleagues in 1996 from a sample of acid volcanic schist of the same formation, about 25 km along strike. Combining Nutman et aI's (1996) published data with the new analyses reported here gives a pooled age of 2606 ± 6 Ma (n = 34, 1σ, χ2 = 1.31), within error of both of the separately determined ages. Having regard to the reported uniform lithology of the Daginkatte Fonnation, the pooled age is probably that of a short magmatic event during which it was formed, and provides a firm constraint relevant to this stratigraphic level of the Chitradurga Group; however. it is now important to determine whether the rhyolitic rocks of the Daginkatte Formation are intrusive or extrusive.Keywords
Geochronology, Zircon U-Ph Age, Rhyolite, Dharwar Supergroup, Karnataka.- A Precise Zircon U-Pb Age for the Base of the BIF of the Mulaingiri Formation, (Bababudan Group, Dharwar Supergroup) of the Karnataka Craton
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PDF Views:4
Authors
Affiliations
1 School of Physical Sciences, Curtin University of Technology, GPO Box 1987, Perth 6000, Western Australia, AU
2 Geological Survey of Western Australia, Mineral House, 1 Plain Street, East Perth 6004, Western Australia, AU
3 Department of Geology, University of Calcutta, 35 Ballygunge Circular Road. Calcutta 700 019, IN
1 School of Physical Sciences, Curtin University of Technology, GPO Box 1987, Perth 6000, Western Australia, AU
2 Geological Survey of Western Australia, Mineral House, 1 Plain Street, East Perth 6004, Western Australia, AU
3 Department of Geology, University of Calcutta, 35 Ballygunge Circular Road. Calcutta 700 019, IN