Srikantappa, C. and Hensen, B. J. (1992) Metamorphic conditions and characterization of fluids in the MM hill granulites, Karnataka, India. Neues Jahrbuch für Mineralogie Monatshefte (11). pp. 495-506. ISSN 0028-3649
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Charnockite and cordierite-bearing gneisses occur in the Male-Mahadeshwara Hills (MM Hills) in Karnataka, southern India. Petrographic observations indicate a prograde Mg - cordierite partial breakdown reaction to give rise to garnet + sillimanite + quartz and a retrograde reaction to sillimanite + biotite + quartz. Geothermobarometric data document a peak metamorphic temperature of 850-860-degrees-C at pressures of 7-8.2 kb for the charnokites. The cordierite gneisses record retrograde conditions of 550-690-degrees-C and 6-6.3 kb. High density carbonic inclusions (0.900 - 1.120 g/cc) occur in these granulites. Textural studies combined with CO2 density data indicate isobaric cooling of the granulite complex suggesting a midcrustal metamorphism caused by magmatic heat advection.
| Item Type: | Article |
|---|---|
| Subjects: | F Earth Science > Geology |
| Depositing User: | Users 23 not found. |
| Date Deposited: | 16 May 2021 05:21 |
| Last Modified: | 06 Dec 2022 09:51 |
| URI: | http://eprints.uni-mysore.ac.in/id/eprint/16412 |
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