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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Asia
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Himalayas
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Kumaun Himalayas (1)
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Indian Peninsula
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India
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Madhya Pradesh India (2)
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West Bengal India (1)
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elements, isotopes
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metals
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actinides
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plutonium
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rare earths (1)
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fossils
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Chordata
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geologic age
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Cenozoic
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minerals
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carbonates
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aragonite (1)
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calcite (1)
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Primary terms
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Asia
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Himalayas
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Kumaun Himalayas (1)
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Indian Peninsula
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India
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Madhya Pradesh India (2)
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Sagar India (1)
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West Bengal India (1)
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Cenozoic
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Quaternary (1)
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Tertiary (1)
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Chordata
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Vertebrata
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Tetrapoda
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Reptilia
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Diapsida (1)
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earthquakes (1)
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isotopes
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radioactive isotopes
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Pu-239 (1)
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Mesozoic
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Cretaceous (1)
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Triassic
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Middle Triassic (1)
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metals
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actinides
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plutonium
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Pu-239 (1)
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rare earths (1)
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waste disposal (1)
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weathering (1)
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rock formations
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Gondwana System
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upper Gondwana System (1)
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sedimentary rocks
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sedimentary rocks
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TAPHONOMY AND DEPOSITIONAL SETTING OF THE SHRINGASAURUS INDICUS (ARCHOSAUROMORPHA: ALLOKOTOSAURIA) BONEBED FROM THE MIDDLE TRIASSIC DENWA FORMATION, SATPURA GONDWANA BASIN, INDIA
Adsorption of actinides within speleothems
Modelling of dissolution–reprecipitation ion-exchange reactions for the development of flame perthite in a suite of sheared alkaline rocks: an example from Chimakurthy, Eastern Ghats, India
Metamorphic evolution of the Chotanagpur Granite Gneiss Complex of the East Indian Shield: current status
Abstract Geological information on the Chotanagpur Granite Gneiss Complex (CGGC) has been reviewed with a view to: (a) identifying the different metamorphic episodes; (b) developing an event stratigraphy in the high-grade blocks; and (c) correlating the different metamorphic episodes with the globally extensive orogenic processes. Integrating the existing geological information, the geological evolution of the high-grade block of the CGGC has been divided into four stages associated with four distinct metamorphic events ( M I − M IV ). The earliest metamorphic event ( M I ) that is recorded in granulite enclaves in the regionally extensive felsic gneisses culminated in ultrahigh temperatures (>900 °C at c . 5–8 kbar) at around 1.87 Ga. In the second stage, voluminous felsic magmas were intruded – the M I granulites – and were metamorphosed to form migmatitic felsic gneisses ( M II ) within about 1.66–1.55 Ga. The third stage witnessed intrusions of a suite of anorthosite and porphyritic granitoids ( c . 1.55–1.51 Ga), followed by high-grade metamorphism (700±50 °C, 6.5±1 kbar, M III ) during approximately 1.2–0.93 Ga. The fourth stage ( M IV ) is marked by the intrusion of a suite of mafic dykes, followed by infiltration-driven metamorphism (600–750 °C at 7±1) during 0.87–0.78 Ga. The proposed metamorphic events have been correlated with the supercontinental cycles in the Proterozoic time.
Reactivation of basement: example from the Anasagar Granite Gneiss Complex, Rajasthan, western India
Abstract Amidst the Meso- to Neoproterozoic South Delhi Fold Belt (SDFB) of Rajasthan, India, a sheet-like body of megacrystic Anasagar Granite Gneiss (AGG) embedded in a supracrustal unit consisting of metapelites, quartzite and calc gneiss is exposed. Detailed analyses of mesoscopic and microscopic structures identify four phases of deformation. Lithological relationships coupled with U–Pb dates of zircon indicate that the protolith of the AGG was emplaced within the supracrustal unit during D 1 folding at approximately 1.85 Ga. This event is significantly older than the age of volcanism in the SDFB (0.99 Ga) but probably synchronous with Aravalli Orogeny. Thrusts associated with the easterly-vergent D 2 folds have a ramp–flat geometry and are refolded by coaxial D 3 folds. The petrology of the metapelites indicates that porphyroblasts of staurolite and/or garnet were formed as a function of bulk-rock composition between D 1 and D 3 folding, at the time of the culmination of metamorphism (5.7±1.5 kbar, 560±50 °C). Combining the petrological and structural attributes, it is proposed that the AGG and its enveloping supracrustals might represent the basement of the Delhi Supergroup, which was folded, thrusted and domed up during the South Delhi Orogeny. The cause of the thermal perturbation that triggered the growth of the porphyroblasts in the metapelites is explored.