Metamorphism, Crustal Evolution and Amalgamation of Meso- to Neo-Archaean Greenstone-Granite Craton and Granulite-Gneiss Terrane in Rajasthan

Guha, D. B.

doi:10.1007/978-3-319-89698-4_25

Cited by 2 publications

(3 citation statements)

References 28 publications

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“…The BGC has been reclassified as the Bhilwara Supergroup (BSG, Raja Rao, 1970;Gupta et al, 1997) which is made up of lithologies of granulite facies Sandmata Complex (SC, 2.29−1.72 Ga; Sarkar et al, 1989;Buick et al, 2006), amphibolite facies Mangalwar Complex (MC, 3.3−2.8 Ga; Gopalan et al, 1990) and greenschist facies Hindoli Group (younger than 2.52 Ga; Dey et al, 2018). The geology of the BSG has been worked out in detail by Guha and Bhattacharya (1995), Mohanty and Guha (1995), Gupta et al (1997), Chakrabarti et al (2004), Guha (2018), and specially the geological and petrological details of the migmatite gneisses and its enclosing granite pluton (Anjana Granite) north of the present granite pluton (Amet Granite) is dealt in detail by Guha et al (2018).…”

Section: Geological Settingmentioning

confidence: 99%

“…1). The Amet Granite is intrusive within the migmatite rock and is considered a product of partial melting of migmatite gneisses of the Mangalwar Complex (Guha, 2018;Guha et al, 2018). This plutonic body is semi-circular with moderately developed foliation in the core part.…”

Section: Rock Types Containing Allanitementioning

confidence: 99%

“…During Archaean-Proterozoic times, the Rajasthan craton witnessed formation of greenstone sequences and granulite gneisses (Mohanty and Guha, 1995;Guha, 2018). The deformational and metamorphic episodes led to crystallisation of migmatite gneisses with several episodes of anatectic melting, and emplacement of several intrusive magmatic plutons .…”

Section: Introductionmentioning

confidence: 99%

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Allanite-britholite bearing migmatite gneiss-Amet Granite and intrusive syenite-monzonite rocks of SW Rajasthan, India, and their REE potential

et al. 2020

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Allanite and REE bearing minerals are primum fama report from migmatite gneisses, plutonic Amet granite and intrusive alkaline rocks of Rajasthan, and these minerals are important for establishing REE deposit. Allanite taken from host migmatite and granite have been analysed along with host rocks containing REE minerals, both of which contain appreciably high amount of ΣREE and Th. Allanite phases identified are CaO and Ce 2 O 3 rich with positive correlation of silica and alumina. As silica proportion decreases and ΣREE increases, allanite changes to britholite and thorite indicating a role of fluid in its crystallization. The chondrite normalized REE in migmatite gneiss and allanite mineral is compatible indicating a primary nature of allanite. The carrier of REE minerals is envisaged as the alkaline intrusives which deposited their REE minerals during ascent of magma from deeper source. Chemico-mineralogical study of Allanite and its hosts suggest possible reaction between a REE bearing fluid rich in P and F brought up by alkaline rocks, and the silicate minerals, mainly biotite and hornblende of the migmatite gneiss and Amet granite. The allanite in migmatite gneiss and granite may prove to be a sumptuous deposit of REE minerals in India, and similar terrains elsewhere.

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