V.J. Rajesh

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Neoarchean arc magmatism and Paleoproterozoic granulite‐facies metamorphism in the Bhavani Suture Zone, South India

Sam Uthup, Toshiaki Tsunogae, V.J. Rajesh, M. Santosh, more

Geological Journal > 55 > 5 > 3870 - 3895

The Bhavani Suture Zone in the Southern Granulite Terrane marks the zone of amalgamation of the Neoarchean Nilgiri Block and the northwestern Madurai Block in southern India. Here, we report detailed petrological, geochemical, and geochronological data on the Mettupalayam mafic–ultramafic complex within this suture zone with a view to evaluate the tectonothermal history of the Bhavani Suture Zone...

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Evolution of the Indian subcontinent: Introduction

K.R. Hari, E. Shaji, S. Ganguly, V.J. Rajesh, more

Geological Journal > 54 > 5 > 2755 - 2758

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Spectral and chemical characterization of gypsum‐phyllosilicate association in Tiruchirapalli, South India, and its implications

Mahima Singh, V.J. Rajesh, Bharathi Kannan, Satadru Bhattacharya, more

Geological Journal > 53 > 5 > 1685 - 1697

Here, we present the detailed chemical and spectral characteristics of gypsum‐phyllosilicate association of Karai Shale Formation in Tiruchirapalli region of the Cauvery Basin in South India. The Karai Shale Formation comprises Odiyam sandy clay and gypsiferous clay, well exposed in Karai village of Tiruchirapalli area, Tamil Nadu in South India. Gypsum is fibrous to crystalline and translucent/transparent...

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Petrogenesis and tectonic setting of the Bondla mafic-ultramafic complex, western India: Inferences from chromian spinel chemistry

C. Ishwar-Kumar, V.J. Rajesh, B.F. Windley, T. Razakamanana, more

Journal of Asian Earth Sciences > 2016 > 130 > C > 192-205

Crustal-scale shear/suture zones hold prime importance because they are one of the critical parameters used for paleogeographic configurations of supercontinental assemblies. The Kumta suture, located on the western margin of peninsular India, has been interpreted as the eastern extension of the Betsimisaraka suture zone of Madagascar. This suture separates the Karwar block (ca. 3200Ma tonalite-trondhjemite-granodiorite...

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Spectral and chemical characterization of jarosite in a palaeolacustrine depositional environment in Warkalli Formation in Kerala, South India and its implications

Mahima Singh, V.J. Rajesh, K.S. Sajinkumar, K. Sajeev, more

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy > 2016 > 168 > C > 86-97

Coastal cliffs fringing the Arabian Sea near Varkala exhibits the Warkalli Formation of the Tertiary sequence of Kerala, South India, with well-marked occurrence of jarosite associated with other hydrous mineral phases of phyllosilicate family in a palaeo-lacustrine depositional environment. Sandy phyllosilicates dominate the mineral assemblage, but jarosite occurs as a prominent secondary phase formed...

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Spectral characteristics of banded iron formations in Singhbhum craton, eastern India: Implications for hematite deposits on Mars

Mahima Singh, Jayant Singhal, K. Arun Prasad, V.J. Rajesh, more

Geoscience Frontiers > 2016 > 7 > 6 > 927-936

Banded iron formations (BIFs) are major rock units having hematite layers intermittent with silica rich layers and formed by sedimentary processes during late Archean to mid Proterozoic time. In terrestrial environment, hematite deposits are mainly found associated with banded iron formations. The BIFs in Lake Superior (Canada) and Carajas (Brazil) have been studied by planetary scientists to trace...

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Elastic thickness structure of the Andaman subduction zone: Implications for convergence of the Ninetyeast Ridge

R.T. Ratheesh Kumar, B.F. Windley, V.J. Rajesh, M. Santosh

Journal of Asian Earth Sciences > 2013 > 78 > Complete > 291-300

We use the Bouguer coherence (Morlet isostatic response function) technique to compute the spatial variation of effective elastic thickness (T _e ) of the Andaman subduction zone. The recovered T _e map resolves regional-scale features that correlate well with known surface structures of the subducting Indian plate and the overriding Burma plate. The major structure on the India plate,...

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Two ultramafic rock types in the Hongseong area, South Korea: Tectonic significance for northeast Asia

J. Seo, C.W. Oh, S.G. Choi, V.J. Rajesh

LITHOS > 2013 > 175-176 > Complete > 30-39

Several isolated lensoidal mafic and serpentinized ultramafic bodies occur in the Hongseong area, South Korea, which is the Korean extension of the Dabie–Sulu collisional belt of China and the northern margin of the South China Block. The mafic and ultramafic bodies are important in any interpretation of the Neoproterozoic tectonics of northeast Asia related to the amalgamation and break-up of the...

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High-Mg low-Ni olivine cumulates from a Pan-African accretionary belt in southern India: Implications for the genesis of volatile-rich high-Mg melts in suprasubduction setting

V.J. Rajesh, S. Arai, M. Satish-kumar, M. Santosh, more

Precambrian Research > 2013 > 227 > Complete > 409-425

We report petrologic, geochemical, fluid inclusion and stable isotopic data from an unusual spinel dunite occurring within metasedimentary units of the Late Neoproterozoic–Cambrian accretionary belt in the southernmost part of the Southern Granulite Terrain in India. The volatile-rich dunite is mainly composed of cumulus olivine with intercumulus ilmenite, phlogopite, spinel, graphite, Ni-bearing...

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A Cretaceous forearc ophiolite in the Shyok suture zone, Ladakh, NW India: Implications for the tectonic evolution of the Northwest Himalaya

Ngo Xuan Thanh, V.J. Rajesh, Tetsumaru Itaya, Brian Windley, more

LITHOS > 2012 > 155 > Complete > 81-93

The northwestern Himalaya in India contains critical evidence of the convergent margin and collision tectonics between the Ladakh arc and the Karakoram block. Here we present new petrochemical and geochronological data from a forearc ophiolite at the Shyok‐Nubra river confluence. Whole-rock geochemical data show relatively high large-ion lithophile elements (LILE), light rare earth elements (LREE),...

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U–Pb SHRIMP zircon geochronology, petrogenesis, and tectonic setting of the Neoproterozoic Baekdong ultramafic rocks in the Hongseong Collision Belt, South Korea

C.W. Oh, J. Seo, S.G. Choi, V.J. Rajesh, more

LITHOS > 2012 > 128-131 > Complete > 100-112

The Hongseong area, located in the western Gyeonggi Massif, South Korea, can be correlated with the northern margin of the South China block (Yangtze Craton). This area experienced Neoproterozoic igneous activity related to subduction before the amalgamation of Rodinia. Several isolated, lenticular, and serpentinized ultramafic–mafic bodies occur in the Hongseong area. The Baekdong body, one of the...

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Spinel compositions and tectonic relevance of the Bibong ultramafic bodies in the Hongseong collision belt, South Korea

C.W. Oh, V.J. Rajesh, J. Seo, S.-G. Choi, more

LITHOS > 2010 > 117 > 1-4 > 198-208

The Hongseong area in the western Gyeonggi Massif, South Korea, is characterized by the occurrence of several isolated ultramafic lenses in close association with metabasites within the granitic gneiss. Most of these bodies suffered various degrees of serpentinization and also have been highly deformed and metamorphosed. The Bibong ultramafic rock is assumed to be a mantle section of a probable Neoproterozoic...

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LREE-rich hibonite in ultrapotassic rocks in southern India

V.J. Rajesh, S. Arai, M. Santosh, A. Tamura

LITHOS > 2010 > 115 > 1-4 > 40-50

We describe a rare terrestrial occurrence of hibonite (CaAl ₁₂ TiO ₁₉ ) from the ultrapotassic rocks which occur as veinlets in graphite-bearing spinellite in the Achankovil Shear Zone (ACSZ), southern India. The ultrapotassic rocks are characterized by an unusual mineral assemblage, kalsilite + leucite + corundum + spinel + perovskite + apatite + hibonite ± phlogopite, along with...

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Neoproterozoic tectonic evolution of the Hongseong area, southwestern Gyeonggi Massif, South Korea; implication for the tectonic evolution of Northeast Asia

C.W. Oh, S.-G. Choi, J. Seo, V.J. Rajesh, more

Gondwana Research > 2009 > 16 > 2 > 272-284

Two types of Neoproterozoic metabasites occur together with regionally intruded arc-related Neoproterozoic granitoids (ca. 850–830 Ma) in the Hongseong area, southwestern Gyeonggi Massif, South Korea, which is the extension of the Dabie–Sulu collision belt in China. The first type of metabasite (the Bibong and Baekdong metabasites) is a MORB-like back-arc basin basalt or gabbro formed at ca. 890–860 Ma...

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2006 Gondwana Research Best Paper Award

Richard J. Goldfarb, Anne Nedelec, Ian Buick, Tetsuo Kawakami, more

Gondwana Research > 2007 > 12 > 3 > 334

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Phanerozoic high-pressure eclogite and intermediate-pressure granulite facies metamorphism in the Gyeonggi Massif, South Korea: Implications for the eastward extension of the Dabie–Sulu continental collision zone

Sung Won Kim, Chang Whan Oh, Ian S. Williams, Daniela Rubatto, more

LITHOS > 2006 > 92 > 3-4 > 357-377

Petrological analysis, zircon trace element analysis and SHRIMP zircon U–Pb dating of retrogressed eclogite and garnet granulite from Bibong, Hongseong area, SW Gyeonggi Massif, South Korea provide compelling evidence for Triassic (231.4±3.3 Ma) high-pressure (HP) eclogite facies (M1) metamorphisms at a peak pressure–temperature (P–T) of ca. 16.5–20.0kb and 775–850°C. This was followed by isothermal...

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Baddeleyite-apatite-spinel-phlogopite (BASP) rock in Achankovil Shear Zone, South India, as a probable cumulate from melts of carbonatite affinity

V.J. Rajesh, S. Arai

LITHOS > 2006 > 90 > 1-2 > 1-18

We report here the petrography, mineralogy and in-situ trace-element mineral geochemistry of a rare and hitherto unidentified baddeleyite-apatite-spinel-phlogopite (BASP) rock in Late Neoproterozoic Achankovil Shear Zone (ACSZ) in South India. The rock unit occurs as isolated outcrops and demarcates the western boundary of an ultramafic complex in ACSZ. The modal mineralogy of the BASP rock is baddeleyite<apatite<spinel<phlogopite...

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Dunite, Glimmerite and Spinellite in Achankovil Shear Zone, South India: Implications for Highly Potassic CO2-rich Melt Influx Along an Intra-continental Shear Zone

V.J. Rajesh, M. Arima, M. Santosh

Gondwana Research > 2004 > 7 > 4 > 961-974

In the Kakkaponnu area within the Achankovil Shear Zone (ACSZ), southern India, an undeformed ultramafic body occurs within intensely deformed granulite facies metamorphic rocks of Pan-African age. The Kakkaponnu ultramafic body is composed of spinel-dunite, phlogopite-dunite, glimmerite, graphite-spinel-glimmerite, and phlogopite-graphite-spinellite. The spinel-dunite is a fine- to medium-grained...

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Geology of the Achankovil Shear Zone, Southern India

V.J. Rajesh, M. Arima, M. Santosh

Gondwana Research > 2001 > 4 > 4 > 744-745

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Search results for: V.J. Rajesh

Neoarchean arc magmatism and Paleoproterozoic granulite‐facies metamorphism in the Bhavani Suture Zone, South India

Evolution of the Indian subcontinent: Introduction

Spectral and chemical characterization of gypsum‐phyllosilicate association in Tiruchirapalli, South India, and its implications

Petrogenesis and tectonic setting of the Bondla mafic-ultramafic complex, western India: Inferences from chromian spinel chemistry

Spectral and chemical characterization of jarosite in a palaeolacustrine depositional environment in Warkalli Formation in Kerala, South India and its implications

Spectral characteristics of banded iron formations in Singhbhum craton, eastern India: Implications for hematite deposits on Mars

Elastic thickness structure of the Andaman subduction zone: Implications for convergence of the Ninetyeast Ridge

Two ultramafic rock types in the Hongseong area, South Korea: Tectonic significance for northeast Asia

High-Mg low-Ni olivine cumulates from a Pan-African accretionary belt in southern India: Implications for the genesis of volatile-rich high-Mg melts in suprasubduction setting

A Cretaceous forearc ophiolite in the Shyok suture zone, Ladakh, NW India: Implications for the tectonic evolution of the Northwest Himalaya

U–Pb SHRIMP zircon geochronology, petrogenesis, and tectonic setting of the Neoproterozoic Baekdong ultramafic rocks in the Hongseong Collision Belt, South Korea

Spinel compositions and tectonic relevance of the Bibong ultramafic bodies in the Hongseong collision belt, South Korea

LREE-rich hibonite in ultrapotassic rocks in southern India

Neoproterozoic tectonic evolution of the Hongseong area, southwestern Gyeonggi Massif, South Korea; implication for the tectonic evolution of Northeast Asia

2006 Gondwana Research Best Paper Award

Phanerozoic high-pressure eclogite and intermediate-pressure granulite facies metamorphism in the Gyeonggi Massif, South Korea: Implications for the eastward extension of the Dabie–Sulu continental collision zone

Baddeleyite-apatite-spinel-phlogopite (BASP) rock in Achankovil Shear Zone, South India, as a probable cumulate from melts of carbonatite affinity

Dunite, Glimmerite and Spinellite in Achankovil Shear Zone, South India: Implications for Highly Potassic CO2-rich Melt Influx Along an Intra-continental Shear Zone

Geology of the Achankovil Shear Zone, Southern India

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