| Reference Type | Journal (article/letter/editorial) |
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| Title | Mineral parageneses and metamorphic reactions in metasedimentary enclaves from the Archaean Gneiss Complex of north-west India |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Sharma, Ram. S. | Author |
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| Windley, Brian F. | Author |
| Year | 1984 (June) | Volume | 48 |
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| Issue | 347 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_48/48-347-195.pdf+ |
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| DOI | doi:10.1180/minmag.1984.048.347.04Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 3616 | Long-form Identifier | mindat:1:5:3616:4 |
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| GUID | 0 |
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| Full Reference | Sharma, Ram. S., Windley, Brian F. (1984) Mineral parageneses and metamorphic reactions in metasedimentary enclaves from the Archaean Gneiss Complex of north-west India. Mineralogical Magazine, 48 (347) 195-209 doi:10.1180/minmag.1984.048.347.04 |
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| Plain Text | Sharma, Ram. S., Windley, Brian F. (1984) Mineral parageneses and metamorphic reactions in metasedimentary enclaves from the Archaean Gneiss Complex of north-west India. Mineralogical Magazine, 48 (347) 195-209 doi:10.1180/minmag.1984.048.347.04 |
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| In | (1984, June) Mineralogical Magazine Vol. 48 (347) Mineralogical Society |
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| Abstract/Notes | AbstractThree metasedimentary enclaves up to a kilometre in length of contrasting compositions within the polymetamorphic Banded Gneissic Complex (> 2580Ma) have been studied for their mineral parageneses and metamorphic conditions. The largest enclave, consisting of kyanite-chloritoid-muscovite schist with quartz or corundum, and kyanite-fuchsite-corundum ± diaspore, was metamorphosed at most under lower amphibolite conditions, and is thus not isofacial with the surrounding schists and gneisses (of the ‘basement’ complex) which reached sillimanite-grade metamorphism in the last orogenic cycle (Aravalli: 1650–950Ma Orogeny) in Rajasthan.The second enclave is a calc-silicate rock which occurs as a small lens. The presence of two generations of wollastonite which formed during different metamorphic events in the calcite-quartz-grossularite-anorthite-clinopyroxene assemblage indicates polymetamorphism.The third enclave is a metabasic rock which records a complete polymetamorphic history in discontinuous zones in garnet coexisting with hornblende-chlorite-plagioclase-quartz±epidote. To explain the garnet zoning a model involving partial resorption of early garnet during the initial recrystallization stage of superimposed regional metamorphism is preferred to the alternative based on a single prograde metamorphism and retrogression.The mineralogy of the calc-silicate and metabasic enclaves gives a recrystallization temperature of c. 700°C and a pressure in the range of 8–3 kbar during the second metamorphism. |
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