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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Shillong Plateau
An Updated and Unified Complete Earthquake Catalog of the Shillong Plateau and Adjoining Region Available to Purchase
Role of Intraplate Strike-Slip Earthquakes in Accommodating Convergence Across the Eastern Himalayan Plate Boundary System Open Access
Petrography and Geochemistry of the Lower Sylhet Sandstone Member (Therria Sandstone) of Jaintia Group Exposed Along Jowai-Badarpur Road Section, Jaintia Hills District, Meghalaya: Implication for Provenance and Palaeoclimate Available to Purchase
Petro-geochemical Signatures as Evidences for Tectonic Setting, Palaeoweathering and Provenance of Eocene Kopili Sandstones, Meghalaya, Northeast India Available to Purchase
Orbicular and Nodular Structures in Carbonatite of the Sung Valley Ultramafic-Alkaline-Carbonatite Complex, Shillong Plateau, Meghalaya, NE India: Their Petrogenetic Implications Available to Purchase
Unraveling Depositional Mode and Provenance of Kopili Formation, Northeast India Available to Purchase
Seismic Site Characterization Using Ambient Noise and Earthquake HVSR in the Easternmost Part of Shillong Plateau, India Available to Purchase
Petrography and Geochemistry of Sandstones of Eocene Kopili Formation, Shillong Plateau: Implications on Paleo-weathering, Provenance and Tectonic Setting Available to Purchase
Deterministic, Probabilistic, and Data-enhanced Models of Seismic Hazard Assessments with some Applications to Central Asian Regions Available to Purchase
Precise Locating of the Great 1897 Shillong Plateau Earthquake Using Teleseismic and Regional Seismic Phase Data Open Access
Geophysical Studies for the Crust and Upper Mantle Structure of the Himalaya: Contributions of CSIR-NGRI Available to Purchase
Nature of Biotites from the Granitoids of Guwahati and Mayong Areas of Shillong Plateau, Northeastern India and their Petrogenetic Significance Available to Purchase
Heavy Mineral Analysis of Jamuna River Sediments, Bangladesh Available to Purchase
Earthightis : Creaking Hills and Wobbling Valleys Available to Purchase
A Comparative Heavy Mineral Study of the Cenozoic Sediments of Assam and Siwalik Foreland Basins, Northeast Himalaya Available to Purchase
Coupled Microfracturing and Chemical Weathering of Precambrian Quartzite in the Extremely Humid and Tectonically Active Shillong Plateau, NE India: Implications for In Situ Quartz Weathering and Quartz Silt Production Available to Purchase
Characterization and metamorphic evolution of Mesoproterozoic granulites from Sonapahar (Meghalaya), NE India, using EPMA monazite dating Available to Purchase
Organic Geochemistry, Petrography, Depositional Environment and Hydrocarbon Potential of the Eocene Coal Deposits of west Daranggiri Coalfield, Meghalaya Available to Purchase
Timing and mechanism of the rise of the Shillong Plateau in the Himalayan foreland Open Access
Mineralogy, geochemistry and geochronology of mafic magmatic enclaves and their significance in evolution of Nongpoh granitoids, Meghalaya, NE India Available to Purchase
Abstract: The Cambrian Nongpoh granitoids, intrusive into the Precambrian gneissic complex and metasediments of the Shillong Group, represent a major phase of granitic magmatism in the Shillong Plateau. The Nongpoh granitoids comprise diorite, granodiorite, porphyritic and grey granites. Porphyritic granite is the dominant lithology exposed in the Nongpoh granitoids, and contains three types of enclaves, viz. xenoliths of gneissic rocks, dark grey porphyry and biotite-rich microgranular enclaves. The mafic magmatic enclaves (MMEs) of various dimensions and shapes, including rounded, ellipsoidal, rectangular, angular to subangular, and stretched bodies, were produced by evolving nature and contrasting kinematics of interacting felsic and mafic magmas. The biotite-rich enclaves are due to the injection of syn-magmatic mafic dykes in felsic magma. The various textural assemblages and sub-linear variations between silica and major oxides, chemical mixing and element diffusion suggest that multistage magma hybridization was the key process during the evolution of the Nongpoh granitoids. The 501 Ma age obtained by chemical (U–Th–Pb) dating of monazite in MME ascertained the age of the magma hybridization event in the Nongpoh granitoids, which is equivalent to the igneous activity at 500 Ma during the amalgamation of Eastern Gondwana.