Geochronology of the 983‐Ma Chilka Lake Anorthosite, Eastern Ghats Belt, India: Implications for Pre‐Gondwana Tectonics

Chatterjee, Nilanjan; Crowley, James L.; Mukherjee, A.; Das, Subhasish

doi:10.1086/528901

Cited by 60 publications

(28 citation statements)

References 51 publications

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“…Massive and disseminated Fe-Ti concentrations occur in gabbros and anorthosites, and the layered Selvåg gabbroic intrusion (Priesemann and Krause, 1985) represents a minor potential for Fe-Ti ore. Massif-type anorthosites also outcrop in southwest Madagascar (Ashwal et al, 1998) and India, which were both part of East Gondwana. The Eastern Ghats Belt of India hosts four massif-type anorthosite complexes (Bhattacharya et al, 1998;Krause et al, 2001;Dobmeier and Simmat, 2002;Dobmeier, 2006;Chatterjee et al, 2008). Other massifs are also described in south India (Janardhan and Wiebe, 1985), but no ore bodies have been discovered.…”

Section: Spatial and Temporal Distributionmentioning

confidence: 99%

Fe–Ti–V–P ore deposits associated with Proterozoic massif-type anorthosites and related rocks

Charlier

Namur

Bolle

et al. 2015

Earth-Science Reviews

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a b s t r a c t a r t i c l e i n f oMagmatic rocks containing economic concentrations of iron, titanium, vanadium and phosphorous are commonly associated with massif-type anorthosites and related rocks. This rock association is part of the anorthositemangerite-charnockite-(rapakivi-)granite suites that are restricted to the Proterozoic. Understanding the geochemistry and emplacement mechanisms of ilmenite, magnetite and apatite ore deposits is crucial for exploration, efficient mining operations and ore processing. This review discusses the controlling factors on the grade of an ore, its mineralogy, and its major and trace element distribution. We present petrogenetic models of currently mined deposits (Lac Tio, Tellnes, Damiao) and discuss the characteristics of minor ore bodies from anorthosite provinces worldwide (Grenville, North China Craton, East European Craton, Rogaland, Laramie). Models of formation of anorthosite and related rocks are presented, as well as the nature of the possible parental magmas of the suite. A mineralogical classification of Fe-Ti ores is proposed: (1) Gabbro-noritic ilmenite ore ± apatite ± magnetite; (2) Ti-magnetite-dominated ore; (3) Nelsonite (Fe-Ti oxides + apatite); and (4) Rutile-ilmenite ore. The stability of ilmenite and magnetite is then critically reviewed and the influence of various factors, particularly oxygen fugacity and crystallization pressure, is examined. We discuss liquidus compositions of Fe-Ti oxides and the behavior of important trace elements such as Cr and V, both of which are sensitive to fO 2 variations. Postcumulus evolution of both oxides can occur due to re-equilibration with trapped liquid, re-equilibration with ferromagnesian silicates, exsolution, oxidation, reaction between ilmenite and magnetite, and metamorphic overprinting. These various processes are described and their effects on the oxide geochemistry are emphasized. Several potential ore-forming processes have been invoked and can explain the formation of huge concentration of ilmenite, ±magnetite, ±apatite. Fractional crystallization can be combined with crystal sorting and plagioclase buoyancy to produce relative enrichment of dense ore minerals. Silicate liquid immiscibility can segregate conjugate Si-rich and Fe-rich melts, the latter being enriched in Fe-Ti-P. Magma mixing can produce hybrid magmas located in a single-phase field of the phase diagram and precipitate a pure ilmenite cumulate. Alternative processes are also described, such as ejection of Fe-Ti-enriched residual melts by filter-pressing and compaction, solidstate remobilization of ilmenite in veins, and hydrothermal transport of Fe and Ti from the host anorthosite followed by concentration in veins and lenticular ore bodies. The magnetic properties of Fe-Ti ore deposits present contrasting signatures, depending on whether the natural remanent magnetization is dominated by hemo-ilmenite or multi-domain magnetite. Micro-and macro-scale deformation features of ore rocks are intimately correlated with magma emplacement, and...

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Section: Spatial and Temporal Distributionmentioning

confidence: 99%

Fe–Ti–V–P ore deposits associated with Proterozoic massif-type anorthosites and related rocks

Charlier

Namur

Bolle

et al. 2015

Earth-Science Reviews

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“…Most recently Chatterjee et al (2008) reported 983 ± 2.5 Ma ages for Chilka Lake anorthosite. They correlated the emplacement of this anorthosite with charnockitic activity in the presumably adjacent Rayner province of East Antarctica.…”

Section: Eastern Ghats Mobile Beltmentioning

confidence: 99%

Precambrian crustal evolution of Peninsular India: A 3.0 billion year odyssey

Meert

Pandit

Pradhan

et al. 2010

Journal of Asian Earth Sciences

313

115

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“…The western fold belt hosting the anorthosite massifs of Bolangir, Turkel and Jugsaipatna is described as a nappe sheet (Ramakrishnan et al, 1998) and the Tel River Shear Zone (TRSZ) as the root zone of this granulite nappe (Mahapatro et al, 2008). The Bolangir and Chilka Lake Complexes have been dated respectively at 933 Ma (Krause et al, 2001) and 983 Ma (Chatterjee et al, 2008). The mineralogical and petrochemical characteristics of some members of the Jugsaipatna Anorthosite Complex (JAC) were reported by Nanda and Panda (1999) and Joshi et al (2006).…”

Section: Introductionmentioning

confidence: 91%

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

Mahapatro¹,

Nanda²,

Tripathy³

2010

Journal of Asian Earth Sciences

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Geochronology of the 983‐Ma Chilka Lake Anorthosite, Eastern Ghats Belt, India: Implications for Pre‐Gondwana Tectonics

Cited by 60 publications

References 51 publications

Fe–Ti–V–P ore deposits associated with Proterozoic massif-type anorthosites and related rocks

Fe–Ti–V–P ore deposits associated with Proterozoic massif-type anorthosites and related rocks

Precambrian crustal evolution of Peninsular India: A 3.0 billion year odyssey

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

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