期刊
JOURNAL OF EARTH SYSTEM SCIENCE
卷 124, 期 1, 页码 197-211出版社
INDIAN ACAD SCIENCES
DOI: 10.1007/s12040-014-0516-y
关键词
Metamorphism; granulite; Bundelkhand massif; supracrustal rocks; crustal evolution
资金
- Ministry of Mines, Govt. of India, New Delhi
- DST, Govt. of India
The Bundelkhand Gneissic Complex (BnGC) in the central part of the Bundelkhand massif preserves a supracrustal unit which includes pelitic (garnet-cordierite-sillimanite gneiss, garnet-sillimanite gneiss, biotite gneiss and garnet-biotite gneiss) and mafic (hornblende-biotite gneiss and garnetiferous amphibolite) rocks. Granulite facies metamorphism of the complex initiated with breaking down of biotite to produce garnet and cordierite in the pelitic gneisses. Geothermobarometric calculations indicate metamorphic conditions of 720 degrees C/6.2 kbar, followed by a retrograde (687 degrees C/4.9 kbar) to very late retrograde stages of metamorphism (579 degrees C/4.4 kbar) which is supported by the formation of late cordierite around garnet. The P-T conditions and textural relations of the garnet-cordierite-bearing gneiss suggest a retrograde cooling path of metamorphism.
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