Morphology of zircons in massive and incipient charnockites of southern Kerala: Their bearing on the origin

Morphological characteristics of zircons in massive and incipient charnockites show contrasting features between the two types. Significantly greater length/breadth ratio in massive charnockite suggests crystallization in igneous environment, whereas zircons of incipient charnockites point to extend...

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Bibliographic Details
Published in:Current science (Bangalore) 1995-12, Vol.69 (11), p.941-944
Main Authors: Kumar, G. R. Ravindra, Narayanaswamy
Format: Article
Language:English
Subjects:
Biotite
Crystal morphology
Crystals
Garnets
Gneiss
Granulite facies
Minerals
RESEARCH COMMUNICATIONS
Rocks
Shear zones
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Summary:Morphological characteristics of zircons in massive and incipient charnockites show contrasting features between the two types. Significantly greater length/breadth ratio in massive charnockite suggests crystallization in igneous environment, whereas zircons of incipient charnockites point to extended transport, eventual rounding and deposition in sedimentary environment. Further, morphological data agree with the petrological and geochemical observation that the incipient charnockites are probably the highgrade (granulite facies) reaction products of metasediments (argillaceous and arenaceous) whereas massive charnockites developed from igneous protoliths.
ISSN:0011-3891