The Jugsaipatna Anorthosite Complex, Eastern Ghats Belt, India: Magmatic lineage and petrogenetic implications

Mahapatro, Satya Narayana; Nanda, J. K.; Tripathy, A. K.

doi:10.1016/j.jseaes.2009.10.008

Cited by 8 publications

(1 citation statement)

References 28 publications

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“…In the Grenvillian-age EGP comprising the WKZ, CMZ and EKZ, massif anorthosites occur at Chilka Lake (Sarkar, B hanumathi & B alasubrahmanyan, 1981; Bhattacharya, Sen & Acharyya, 1994; Mukherjee, Jana & Das, 1999; Krause et al . 2001; Dobmeier & Simmat, 2002; Chatterjee et al 2008), Bolangir (Tak, Mitra & Chatterjee, 1966; Tak, 1971; Mukherjee, Bhattacharya & Chakravorty, 1986; Raith, Bhattacharya & H oernes, 1997; Bhattacharya et al 1998; Mukherjee, Jana & Das, 1999; Krause et al 2001; Prasad et al 2005; Nasipuri & Bhattacharya, 2007; Nasipuri, Bhattacharya & Satyanarayanan, 2011; Nasipuri & Bhadra, 2013), Turkel (Maji, Bhattacharya & Raith, 1997; Maji & Sarkar, 2004; Raith et al 2014; Dharma Rao, Santosh & Zhang, 2014 a ), Jugsaipatna (Mahapatro, Nanda & Tripathy, 2010; Dharma Rao, Santosh & Zhang, 2014 b ), Koraput (Bose, 1960, 1979) and Udaigiri (Mahapatro et al 2013). The central parts of the plutons are dominated by anorthosite, whereas leuconorite and noritic anorthosite dominate the pluton margins.…”

Section: Geological Backgroundmentioning

confidence: 99%

In situ U–Th–Pb_total dating of polychronous monazite in the Koraput anorthosite pluton, Eastern Ghats Granulite Belt (India), and implications

2017

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U–Th–Pbtotal age determinations in monazite in a noritic anorthosite at the margin of the Koraput anorthosite pluton constrain the time of emplacement and sub-solidus chemical modifications in the Grenvillian-age anorthosite pluton in the Eastern Ghats Province (EGP), India. The monazites hosted within dynamically recrystallized orthopyroxene and plagioclase grains are large (50–500 μm in diameter) and complexly zoned. Based on the textural–chemical heterogeneities, these monazites are classified into three groups. Group-I monazites exhibit a low-ThO2 core mantled by a high-ThO2 rim. By contrast, the group-II monazites exhibit high-ThO2 cores laced by ThO2-poor mantles, and outermost rims with still lower ThO2 contents. Skeletal group-III monazites at polygonized grain/phase boundaries exhibit patchy and concentric zones with decreasing ThO2 towards the margin. The U–Th–Pbtotal chemical ages obtained using electron probe microanalyses exhibit four age clusters. The oldest age population (mean 939 ± 4.5 Ma) obtained in cores in group-I, II and III monazites with patchy zones corresponds with the emplacement of the Koraput anorthosite, and this age population is consistent with 980–930 Ma emplacement ages reported in other EGP anorthosite massifs. Younger monazites mantling the cores in group-II monazites and in group-III monazites with mean ages of 877 ± 5 Ma and 749 ± 18 Ma possibly reflect episodic monazite growth by fluid-aided dissolution–precipitation culminating with the disintegration of Rodinia at ~750 Ma. The youngest age population (mean 574 ± 19 Ma) in the outermost monazite rims and monazite veins represents renewed monazite growth during the Pan African assembly of the Grenvillian-age EGP domain with the proto-Indian cratons.

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Section: Geological Backgroundmentioning

confidence: 99%

In situ U–Th–Pb_total dating of polychronous monazite in the Koraput anorthosite pluton, Eastern Ghats Granulite Belt (India), and implications

2017

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Structural framework for the emplacement of the Bolangir anorthosite massif in the Eastern Ghats Granulite Belt, India: implications for post-Rodinia pre-Gondwana tectonics

Nasipuri

Bhadra

2013

Miner Petrol

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Early Neoarchaean A-type granitic magmatism by crustal reworking in Singhbhum craton: Evidence from Pala Lahara area, Orissa

et al. 2018

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Several volumetrically minor ∼2.8 Ga anorogenic granites and rhyolites occur along the marginal part of the Singhbhum craton whose origin and role in crustal evolution are poorly constrained. This contribution presents petrographic, geochemical, zircon U-Pb and trace element, and mineral chemical data on such granites exposed in the Pala Lahara area to understand their petrogenesis and tectonic setting. The Pala Lahara granites are calc-alkaline, high-silica rocks and define a zircon U-Pb age of 2.79 Ga. These granites are ferroan, weakly metaluminous, depleted in Al, Ca and Mg and rich in LILE and HFSE. They are classified as A2-type granites with high Y/Nb ratios. Geochemical characteristics (high SiO 2 and K 2 O, very low MgO, Mg#, Cr, Ni and V, negative Eu anomaly, flat HREE and low Sr/Y) and comparison with melts reported by published experimental studies suggest an origin through high-temperature, shallow crustal melting of tonalitic/granodioritic source similar to the ∼3.3 Ga Singhbhum Granite. Intrusion of the Pala Lahara granites was coeval with prominent mafic magmatism in the Singhbhum craton (e.g., the Dhanjori mafic volcanic rocks and NNE-SSW trending mafic dyke swarm). It is suggested that the ∼2.8 Ga A-type granites in the Singhbhum craton mark a significant crustal reworking event attendant to mantle-derived mafic magmatism in an extensional tectonic setting.

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The Jugsaipatna Anorthosite Complex, Eastern Ghats Belt, India: Magmatic lineage and petrogenetic implications

Cited by 8 publications

References 28 publications

In situ U–Th–Pb_total dating of polychronous monazite in the Koraput anorthosite pluton, Eastern Ghats Granulite Belt (India), and implications

In situ U–Th–Pb_total dating of polychronous monazite in the Koraput anorthosite pluton, Eastern Ghats Granulite Belt (India), and implications

Structural framework for the emplacement of the Bolangir anorthosite massif in the Eastern Ghats Granulite Belt, India: implications for post-Rodinia pre-Gondwana tectonics

Early Neoarchaean A-type granitic magmatism by crustal reworking in Singhbhum craton: Evidence from Pala Lahara area, Orissa

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The Jugsaipatna Anorthosite Complex, Eastern Ghats Belt, India: Magmatic lineage and petrogenetic implications

Cited by 8 publications

References 28 publications

In situ U–Th–Pbtotal dating of polychronous monazite in the Koraput anorthosite pluton, Eastern Ghats Granulite Belt (India), and implications

In situ U–Th–Pbtotal dating of polychronous monazite in the Koraput anorthosite pluton, Eastern Ghats Granulite Belt (India), and implications

Structural framework for the emplacement of the Bolangir anorthosite massif in the Eastern Ghats Granulite Belt, India: implications for post-Rodinia pre-Gondwana tectonics

Early Neoarchaean A-type granitic magmatism by crustal reworking in Singhbhum craton: Evidence from Pala Lahara area, Orissa

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In situ U–Th–Pb_total dating of polychronous monazite in the Koraput anorthosite pluton, Eastern Ghats Granulite Belt (India), and implications

In situ U–Th–Pb_total dating of polychronous monazite in the Koraput anorthosite pluton, Eastern Ghats Granulite Belt (India), and implications