A Petrographic Atlas of Ophiolite
An example from the eastern India-Asia collision zone
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41 Result(s)
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Article
Open AccessOrigin of the Paleoproterozoic basaltic dikes from the central and eastern Dharwar Craton and sills and volcanics from the adjoining Cuddapah Basin, southern India
Reverse fractionation modeling considering energy-constrained assimilation-fractional crystallization is performed to estimate primary magma compositions, degree of crustal contamination, pressure–temperature ...
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Origin of the primitive, strongly SiO2-undersaturated alkalic rocks from the Deccan Traps by low-degree mantle melting and high-pressure fractional crystallization
Strongly SiO2-undersaturated alkalic rocks (Mg# > 50, SiO2 ≤ 45 wt%, Na2O + K2O ≥ 3 wt%) occur in three early-stage (Sarnu-Dandali, Mundwara, Bhuj) and one late-stage (Murud-Janjira) rift-associated volcanic comp...
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Origin of the Powai ankaramite, and the composition, P–T conditions of equilibration and evolution of the primary magmas of the Deccan tholeiites
The Powai ankaramite flow from Mumbai, western Deccan Traps, contains abundant crystals of augite (En59–47Fs10–14Wo27–42, 22–40 modal %, 3–5 mm) and olivine (Fo84–74, 11–16 modal %, 1–2 mm), and minor plagioclase...
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Exhumation of the UHP Tso Morari eclogite as a diapir rising through the mantle wedge
Ultrahigh-pressure (UHP) rocks such as the coesite-bearing eclogites, occurring as boudins within felsic gneisses of the Tso Morari dome in northwestern Himalayas, originated through subduction of the northern...
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Serpentinite
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Chromitite
Plate Chr-1: Brecciated olivine with euhedral chromite and a vein of serpentine containing granular opaque magnetite in harzburgite tectonite. (380/79-3)
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Anorthosite
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Greenschist
Greenschist consisting of actinolite, chlorite, albite, epidote and quartz. The amphiboles impart lineation(23/80-1)
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Eclogite
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Metamorphics of the Nimi Formation
Plate Nimi-1 Elongated tabular crystals of staurolite and muscovite flakes along foliation in chlorite-biotite-muscovite-garnet-staurolite schist with quartz and feldspar from the Nimi Formation at the eastern...
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Rodingite
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Peridotite Cumulate
Plate Pc-1 Small grains of olivine remnants and opaque in serpentinised dunite. The olivine grains show uniform extinction indicating absence of strain (126/80-2)
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Pyroxenite
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Plagiogranite
Plate PG-1: Hypidiomorphic granular texture in tonalite between crossed polars consisting of twinned plagioclase, quartz, amphibole, chlorite and epidote. Chlorite is more abundant than amphibole (M-1-3).
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Dolerite
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Very-Low Grade Metamorphics
Plate Vlgm-1: Very-low grade, zeolite facies metamorphite between crossed polars containing spherulitic natrolite, twinned albite, epidote, green chlorite and opaque. (K-79-7)
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Late Tertiary Granites
Plate Ltg-1 Late felsic intrusive under crossed polars showing post-crystalline deformation with parallel orientation of quartz and feldspar grains. Plagioclase is saussuritised and twinned. K-feld...
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Structure and Tectonics of the Naga Hills
The evolution of the NHO is linked with the fragmentation and dispersion of Gondwana (protocontinent of the southern hemisphere) and its subsequent collision and amalgamation with Eurasia during Meso-Cenozoic ...
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Petrogenesis
The average composition of peridotite from the ophiolite belt in Manipur shows high MgO(32.0 wt.%), Al2O3 (1.28–3.30 wt.%),Ni (1966 ppm),Cr (2005 ppm)and Co (130 ppm) and low TiO2 (0.12 wt.%), CaO (6.56 wt.%), Na
