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Reaction textures and metamorphic evolution of sapphirine–spinel-bearing and associated granulites from Diguva Sonaba, Eastern Ghats Mobile Belt, India

Published online by Cambridge University Press:  14 August 2014

DIVYA PRAKASH ,
DEEPAK ,
PRAVEEN CHANDRA SINGH ,
CHANDRA KANT SINGH ,
SUPARNA TEWARI ,
MAKOTO ARIMA  and
HARTWIG E. FRIMMEL
DIVYA PRAKASH*
Affiliation:
Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi – 221 005, India
DEEPAK
Affiliation:
Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi – 221 005, India
PRAVEEN CHANDRA SINGH
Affiliation:
Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi – 221 005, India
CHANDRA KANT SINGH
Affiliation:
Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi – 221 005, India
SUPARNA TEWARI
Affiliation:
Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi – 221 005, India
MAKOTO ARIMA
Affiliation:
Geological Institute, Yokohama National University, 79-7 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
HARTWIG E. FRIMMEL
Affiliation:
Institute of Geography and Geology, University of Würzburg, Am Hubland, D-97074 Würzburg, Germany Department of Geological Sciences, University of Cape Town, Rondebosch 7701, South Africa
*
†Author for correspondence: dprakashbhu@gmail.com
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Abstract

The Diguva Sonaba area (Vishakhapatnam district, Andhra Pradesh, South India) represents part of the granulite-facies terrain of the Eastern Ghats Mobile Belt. The Precambrian metamorphic rocks of the area predominantly consist of mafic granulite (±garnet), khondalite, leptynite (±garnet, biotite), charnockite, enderbite, calc-granulite, migmatic gneisses and sapphirine–spinel-bearing granulite. The latter rock type occurs as lenticular bodies in khondalite, leptynite and calc-granulite. Textural relations, such as corroded inclusions of biotite within garnet and orthopyroxene, resorbed hornblende within pyroxenes, and coarse-grained laths of sillimanite, presumably pseudomorphs after kyanite, provide evidence of either an earlier episode of upper-amphibolite-facies metamorphism or they represent relics of the prograde path that led to granulite-facies metamorphism. In the sapphirine–spinel-bearing granulite, osumilite was stable in addition to sapphirine, spinel and quartz during the thermal peak of granulite-facies metamorphism but the assemblage was later replaced by Crd–Opx–Qtz–Kfs-symplectite and a variety of reaction coronas during retrograde overprint. Variable amounts of biotite or biotite+quartz symplectite replaced orthopyroxene, cordierite and Opx–Crd–Kfs–Qtz-symplectite at an even later retrograde stage. Peak metamorphic conditions of c. 1000°C and c. 12 kbar were computed by isopleths of XMg in garnet and XAl in orthopyroxene. The sequence of reactions as deduced from the corona and symplectite assemblages, together with petrogenetic grid and pseudosection modelling, records a clockwise P–T evolution. The P–T path is characteristically T-convex suggesting an isothermal decompression path and reflects rapid uplift followed by cooling of a tectonically thickened crust.

Keywords

sapphirine–spinel-bearing granulitecorona and symplectite texturesphase equilibria modellinghigh-pressure – ultrahigh-temperature metamorphismEastern Ghats Mobile BeltIndia

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Type
Original Articles
Information
Geological Magazine , Volume 152 , Issue 2 , March 2015 , pp. 316 - 340
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Copyright © Cambridge University Press 2014 

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