NDLI: Petrotectonic framework of granulites from northern part of Chilka Lake area, Eastern Ghats Belt, India: Compressional vis-à-vis transpressional tectonics

Content Provider	Springer Nature Link
Author	DAS, KAUSHIK BOSE, SANKAR KARMAKAR, SUBRATA CHAKRABORTY, SUPRIYA
Copyright Year	2012
Abstract	Granulite-facies rocks occurring north-east of the Chilka Lake anothosite (Balugan Massif) show a complex metamorphic and deformation history. The M$_{1}$–D$_{1}$ stage is identified only through microscopic study by the presence of S$_{1}$ internal foliation shown by the M$_{1}$ assemblage sillimanite–quartz–plagioclase–biotite within garnet porphyroblasts of the aluminous granulites and this fabric is obliterated in outcrop to map-scale by subsequent deformations. S$_{2}$ fabric was developed at peak metamorphic condition (M$_{2}$–D$_{2}$) and is shown by gneissic banding present in all lithological units. S$_{3}$ fabric was developed due to D$_{3}$ deformation and it is tectonically transposed parallel to S$_{2}$ regionally except at the hinge zone of the F$_{3}$ folds. The transposed S$_{2}$/S$_{3}$ fabric is the regional characteristic structure of the area. The D$_{4}$ event produced open upright F$_{4}$ folds, but was weak enough to develop any penetrative foliation in the rocks except few spaced cleavages that developed in the quartzite/garnet–sillimanite gneiss. Petrological data suggest that the M$_{4}$–D$_{4}$ stage actually witnessed reactivation of the lower crust by late distinct tectonothermal event. Presence of transposed S$_{2}$/S$_{3}$ fabric within the anorthosite arguably suggests that the pluton was emplaced before or during the M$_{3}$–D$_{3}$ event. Field-based large-scale structural analyses and microfabric analyses of the granulites reveal that this terrain has been evolved through superposed folding events with two broadly perpendicular compression directions without any conclusive evidence for transpressional tectonics as argued by earlier workers. Tectonothermal history of these granulites spanning in Neoproterozoic time period is dominated by compressional tectonics with associated metamorphism at deep crust.
Starting Page	1
Ending Page	17
Page Count	17
File Format	PDF
ISSN	02534126
Journal	Journal of Earth System Science
Volume Number	121
Issue Number	1
e-ISSN	0973774X
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-02-29
Publisher Institution	Indian Academy of Sciences
Publisher Place	India
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Poly-phase metamorphism superposed folding Chilka Lake granulites Eastern Ghats Belt oblique collision Extraterrestrial Physics, Space Sciences Earth Sciences
Content Type	Text
Resource Type	Article
Subject	1900/1901

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