Browsing Scholarly literature by Author "Saha, A."
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Boninitic metavolcanic rocks and island arc tholeiites from the Older Metamorphic Group (OMG) of Singhbhum Craton, eastern India: Geochemical evidence for Archean subduction processes
Manikyamba, C.; Ray, J.; Ganguly, S.; Singh, M.R.; Santosh, M.; Saha, A.; Satyanarayanan, M. (Elsevier, 2015)The metavolcanic rocks of the Paleo-Mesoarchean Older Metamorphic Group (OMG) from Jagannathpur area of the Singhbhum Craton occur as enclaves within the Singhbhum granites (SBG). The primary mineralogical composition of ... -
Episodic recycling of ancient metasomatized continental lithosphere: Evidence from lower oceanic crust of the Central Indian Ridge
Saha, A.; Hazra, A.; Santosh, M.; Ganguly, S.; Li, S.-S.; Manikyamba, C. (Elsevier, 2021)The tectonic and magmatic processes contributing to the heterogeneous nature of the upper mantle posit important constraints on the composition and differentiation of the Earth at various scales. Mid-oceanic ridges of ... -
Geochemical characteristics of basalts from Andaman subduction zone: Implications on magma genesis at intraoceanic back-arc spreading centres
Saha, A.; Mudholkar, A.V.; KameshRaju, K.A.; Doley, B.; Sensarma, S. (2019)This study reports new petrological and geochemical data for the ocean floor volcanic rocks dredged from the back?arc basin of the Andaman Sea and elucidates their geochemical characteristics and petrogenetic aspects to ... -
Geochemical characteristics of gold bearing boninites and banded iron formations from Shimoga greenstone belt, India: Implications for gold genesis and hydrothermal processes in diverse tectonic settings
Ganguly, S.; Manikyamba, C.; Saha, A.; Lingadevaru, M.; Santosh, M.; Rambabu, S.; Khelen, A.C.; Purushotham, D.; Linga, D. (Elsevier, 2016)This paper is the first documentation of boninites from the Kudrekonda Formation of Shimoga greenstone belt (SGB) in western Dharwar Craton (WDC), India and the occurrence of native gold in the associated quartz veins. We ... -
Geochemical characteristics of submarine rhyolitic pumice from Andaman subduction zone: Inferences on magmatism and tectonics of north?eastern Indian Ocean
Saha, A.; DeMello, N.G.; Sensarma, S.; Mudholkar, A.V.; KameshRaju, K.A.; Doley, B. (2019)This paper reports new geochemical data for submarine volcanic pumice sampled from two volcanoes (SM?1 and SV?1) which are part of the Andaman subduction system. SM?1 volcano is located closer to the Andaman back?arc ... -
Geochemical cycling during subduction initiation: Evidence from serpentinized mantle wedge peridotite in the south Andaman ophiolite suite
Saha, A.; Santosh, M.; Ganguly, S.; Manikyamba, C.; Ray, J.; Dutta, J. (Elsevier, 2018)The ophiolite suite from south Andaman Islands forms part of the Tethyan Ophiolite Belt and preserves the remnants of an ideal ophiolite sequence comprising a basal serpentinized and tectonised mantle peridotite followed ... -
Geochemical dichotomy of Tethyan oceanic mantle and the supercontinent connection: Insights from Os isotopic signatures of mantle peridotites from Naga Hills ophiolite
Verencar, A.; Saha, A.; Ganguly, S.; Satyanarayanan, M.; RamMohan, M. (Elsevier, 2024)Naga Hills Ophiolite (NHO) represents a thrusted section of relict Neo-Tethyan oceanic lithosphere comprising distinct crustal and upper mantle lithologies that preserve imprints of different stages of evolution of ancient ... -
Implications of REE incorporation and host sediment influence on the origin and growth processes of ferromanganese nodules from Central Indian Ocean Basin
Sensarma, S.; Saha, A.; Hazra, A. (Elsevier, 2021)This study presents new major, trace and REE data for thirty-five ferromanganese nodules recovered from areas representing three different sediment types (siliceous, red clay and their transition zone) in the Central Indian ... -
Imprints of ancient recycled oceanic lithosphere in heterogeneous Indian Ocean mantle: Evidence from petrogenesis of Carlsberg ridge basalts from Northwest Indian Ocean
Saha, A.; Sensarma, S.; Hazra, A.; Ganguly, S.; Peketi, A.; Doley, B.; Mudholkar, A.V. (Elsevier Inc., 2020)This paper reports new petrological, geochemical and isotopic data for Carlsberg Ridge Basalts (CRB) of northwest Indian Ocean and evaluates their petrogenetic aspects in the context of the geochemical and tectonic evolution ... -
Magma genesis at Andaman volcanic arc regime, Northeastern Indian Ocean: Role of slab-mantle interaction
Saha, A.; Mudholkar, A.V.; KameshRaju, K.A. (International Union of Geological Sciences, 2020)This study reports new petrological and geochemical data of submarine volcanic rocks dredged from the Andaman arc, northeastern Indian Ocean and evaluates their petrogenetic and tectonic implications. The studied samples ... -
Major, trace and platinum group element (PGE) geochemistry of Archean Iron Ore Group and Proterozoic Malangtoli metavolcanic rocks of Singhbhum Craton, Eastern India: Inferences on mantle melting and sulphur saturation history
Singh, M.R.; Manikyamba, C.; Ray, J.; Ganguly, S.; Santosh, M.; Saha, A.; Rambabu, S.; Sawant, S.S. (Elsevier, 2016)The geological and metallogenic history of the Singhbhum Craton of eastern India is marked by several episodes of volcanism, plutonism, sedimentation and mineralization spanning from Paleoarchean to Mesoproterozoic in a ... -
Melt generation and trace element fractionation of intermediate arc magma from Andaman subduction zone
Doley, B.; Saha, A.; Verencar, A.; Mohan, M.R. (Elsevier, 2022)The submarine volcanoes, located in the southern part of Andaman Sea, north eastern Indian Ocean, result from the subduction of the Indo-Australian Plate beneath the Southeast Asian Plate and represent one of the less ... -
Multistage melt impregnation in Tethyan oceanic mantle: Petrochemical constraints from channelized melt flow in the Naga Hills Ophiolite
Verencar, A.; Saha, A.; Ganguly, S.; Satyanarayanan, M.; Doley, B.; RamMohan, M. (Elsevier, 2022)Ophiolitic sequences obducted onto continental margins allow field based observations coupled with petrochemical interrogations of upper mantle lithologies thereby aiding evaluation of compositional heterogeneity of oceanic ... -
Petrogenetic evolution of Cretaceous Samchampi-Samteran Alkaline Complex, Mikir Hills, Northeastern India: Implications on multiple melting events of heterogeneous plume and metasomatized sub-continental lithospheric mantle
Saha, A.; Ganguly, S.; Ray, J.; Koeberl, C.; Thöni, M.; Sarbajna, C.; Sawant, S.S. (Elsevier, 2017)The Samchampi (26° 13' N: 93° 18' E)-Samteran (26° 11' N: 93° 25' E) alkaline complex (SSAC) occurs as an intrusion within Precambrian basement gneisses in the Karbi-Anglong district of Assam, Northeastern India. This ... -
Refertilization of mantle peridotites from the Central Indian Ridge: Response to a geodynamic transition
Hazra, A.; Saha, A.; Verencar, A.; Satyanarayanan, M.; Ganguly, S.; Kotha, M. (Geological Society of America- GeoScienceWorld, 2021)The phenomena of reactive percolation of enriched asthenospheric melts and pervasive melt-rock interactions at mid oceanic ridge-rift systems are the principal proponents for mantle refertilization and compositional ... -
Relics of 2.6-2.5~Ga oceanic crust from the ultramafic-mafic complex of Goa, western India: Magmatic response to a progressive subduction system
Ganguly, Sohini; Verencar, Anisha; Santosh, M.; Saha, A.; Li, S.-S.; Arolkar, N. (Elsevier, 2022)Subduction initiation in the Early Earth and the onset of plate tectonics are topics of wide interest in understanding the formation and evolution of continents and supercontinents on our planet.Here we report results from ... -
Tectono-magmatic evolution of Tethyan oceanic lithosphere in supra subduction zone forearc regime: Geochemical fingerprints from crust-mantle sections of Naga Hills Ophiolite
Verencar, A.; Saha, A.; Ganguly, S.; Manikyamba, C. (Elsevier BV, 2021)The Naga Hills Ophiolite (NHO) belt in the Indo-Myanmar range (IMR) represents a segment of Tethyan oceanic crust and upper mantle that was involved in an eastward convergence and collision of the Indian Plate with the ... -
U enrichment and Th/U fractionation in Archean boninites: Implications for paleo-ocean oxygenation and U cycling at juvenile subduction zones
Manikyamba, C.; Said, N.; Santosh, M.; Saha, A.; Ganguly, S.; Subramanyam, K.S.V. (Pergamon, 2018)Phanerozoic boninites record enrichments of U over Th, giving Th/U: 0.5-1.6, relative to intraoceanic island arc tholeiites (IAT) where Th/U averages 2.6. Uranium enrichment is attributed to incorporation of shallow, ... -
Vestiges of older greenstone in Mesoarchaean Chakradharpur granite gneiss, Singhbhum Craton, India: Implications for plume-lithosphere interaction at rifted cratonic margin
Ghose, N.C.; Saha, A. (2019)The Chakradharpur granite gneiss (CGG) represents an uplifted Archaean basement within the North Singhbhum Orogen (NSO) of Singhbhum-Orissa Craton in the eastern Indian shield and shares a Mesoarchaean 3.12�Ga age equivalent ... -
Zircon U-Pb geochronology and geochemistry of Devonian plagiogranites in the Kuerti area of southern Chinese Altay, northwest China: Petrogenesis and tectonic evolution of late Paleozoic ophiolites
Shen, X.-M.; Zhang, H.-X.; Wang, Q.; Saha, A.; Ma, L. (John Wiley & Sons, 2018)This study presents zircon U-Pb geochronology with major, trace, rare earth element and Sr-Nd isotope geochemistry for plagiogranite dyke swarms occurring within the gabbro unit of the lower part of the Kuerti ophiolite ...