Bose, S. ; Fukuoka, M. ; Sengupta, P. ; Dasgupta, S. (2000) Evolution of high-Mg-Al granulites from Sunkarametta, Eastern Ghats, India: evidence for a lower crustal heating-cooling trajectory Journal of Metamorphic Geology, 18 (3). pp. 223-240. ISSN 0263-4929
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Official URL: http://onlinelibrary.wiley.com/doi/10.1046/j.1525-...
Related URL: http://dx.doi.org/10.1046/j.1525-1314.2000.00253.x
Abstract
A suite of high-Mg-Al granulites from Sunkarametta, Eastern Ghats Belt, India, shows contrasting prograde assemblages of extremely aluminous orthopyroxene+cordierite+sapphirine and similarly aluminous orthopyroxene+Ti-rich spinel in closely associated domains. Textural and compositional characteristics indicate that both were derived from prograde dehydration-melting of biotite-plagioclase-quartz-bearing protoliths. The former assemblage was stabilized at relatively more magnesian bulk composition. Geothermobarometric data and petrogenetic grid considerations place 'peak' metamorphic conditions at c. 950 °C and 9 kbar. Subsequent to peak metamorphism, the rocks cooled to c. 700-750 °C, with slight lowering of pressure, and the retrograde reactions also involved melt-solid interaction. The inferred P-T trajectory is one of heating-cooling at lower crustal (25-30 km) depths.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to John Wiley and Sons. |
| Keywords: | Eastern Ghats; Heating-cooling Trajectory; Prograde Path; UHT Metamorphism |
| ID Code: | 64665 |
| Deposited On: | 12 Oct 2011 11:37 |
| Last Modified: | 12 Oct 2011 11:37 |
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