NDLI: Metamorphism of cordierite gneisses from eastern ghat granulite terrain, andhra pradesh, south india

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Metamorphism of cordierite gneisses from eastern ghat granulite terrain, andhra pradesh, south india

Content Provider	NASA Technical Reports Server (NTRS)
Author	Charan, S. Nirmal Murthy, D. S. N.
Copyright Year	1988
Description	Cordierite-bearing metapelites of the Eastern Ghat granulite terrain occur in close association of Khondalites, quartzites, calc-silicate rocks and charnockites. Rocks occurring between Bobbili in the north and Guntur in the south of Andhra Pradesh are studied. The association of the mineral and textural relationships suggest the following metamorphic reactions: Garnet + sillimanite + quartz = cordierite, hypersthene + sillimanite + quartz = cordierite, sillimanite + spinel = cordierite + corundum, and biotite + quartz + sillimanite = cordierite + K=feldspar. Generally the minerals are not chemically zoned except garnet-biotite showing zoning when they come in close contact with one another. The potential thermometers are provided by the Fe-Mg distribution of coexisting biotite-garnet and cordierite-garnet. Conflicting interpretation of the P/T dependence of these reactions involving cordierite are due to H2O in the cordierite. The presence of alkali feldspar-quartz assemblage which is common in these gneisses will be constrained from melting only if H2O activity is less than 0.5. The piezometric array inferred is convex towards the temperature array, indicating a rapid and isothermal crustal uplift probably aided by thrust tectonics.
File Size	89962
Page Count	2
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19890012860
Archival Resource Key	ark:/13960/t01022j58
Language	English
Publisher Date	1988-01-01
Access Restriction	Open
Subject Keyword	Geophysics Alkalies Melting Cordierite Minerals Quartz Tectonics Gneiss Textures India Spinel Biotite Terrain Metamorphism Geology Aluminum Oxides Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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