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Browsing by Author "Saha, A."

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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. (Lithos. 400-401; 2021; ArticleID_106424.)

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 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. (Geoscience Frontiers. 9(6); 2018; 1755-1775.)

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 ...
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. (Gondwana Research. 86; 2020; 60-82.)

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 ...
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.; Ram Mohan, M. (Geochemistry. 82(1); 2022; ArticleID_125821.)

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. (Gondwana Research. 48; 2017; 237-256.)

The Samchampi (26 degrees 13 minutes N: 93 degrees 18 minutes E)-Samteran (26 degrees 11 minutes N: 93 degrees 25 minutes E) alkaline complex (SSAC) occurs as an intrusion within Precambrian basement gneisses in the ...
Refertilization of mantle peridotites from the Central Indian Ridge: Response to a geodynamic transition

Hazra, A.; Saha, A.; Verencar, A.; Satyanarayanan, M.; Ganguly, S.; Mahender, K. (Lithosphere. 2021(Special 6); 2021; ArticleID_9706924.)

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 ...
Tectonic juxtaposition of plume and subduction derived magmatic sequences in the Bababudan greenstone terrane, western Dharwar Craton, India: Constraining crustal accretion processes in a Neoarchean subduction-collision orogeny

Manikyamba, C.; Ganguly, S.; Santosh, M.; Tang, L.; Sindhuja, C.S.; Pahari, A.; Singh, Th.D.; Saha, A. (Precambrian Research. 355; 2021; ArticleID_106097.)

Archean greenstone belts in the Western Dharwar Craton preserve important clues on Early Earth geodynamics. Here we investigate the ultramafic-mafic metavolcanic rock sequences from the Santaveri Formation of Bababudan ...
Tectono-magmatic evolution of Tethyan oceanic lithosphere in supra subduction zone fore arc regime: Geochemical fingerprints from crust-mantle sections of Naga Hills Ophiolite

Verencar, A.; Saha, A.; Ganguly, S.; Manikyamba, C. (Geoscience Frontiers. 12(3); 2021; ArticleID_101096.)

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. (Journal of Asian Earth Sciences. 157; 2017; 187-197.)

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, oxidized ...

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