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charnockite
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Pan-African charnockite formation in Kerala, South India
Since charnockite formation and subsequent uplift north of the Palghat-Cauvery shear zone had terminated by earliest Proterozoic time, these results confirm two distinct periods of granulite formation in South India and suggest that the Palghat-Cauvery shear zone represents the boundary between two blocks of strongly contrasting geological ...
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ZIRCON U-PB EMPLACEMENT AND ND-HF CRUSTAL …
The Friersdale Charnockite is an undeformed mafic-felsic hybrid rock which occurs in both the Kakamas and Areachap Terranes, thus it was emplaced after their juxtaposition following the ~1220 Ma collision events. Two samples of the charnockite give indistinguishable weighted mean 207 Pb-206 Pb ages for concordant magmatic zircon. Combining the ...
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(PDF) A geochemical perspective on charnockite …
Large charnockite massifs occur in the high-grade Southern Granulite Terrain (SGT) and Eastern Ghats Belt (EGB) crustal provinces of Peninsular India. Available geochronological data indicate that ...
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Charnockite: Mineral information, data and localities.
Charnockite mineral data, information about Charnockite, its properties and worldwide locations. Thank you for your donations large and small - we appreciate your ongoing support Log In Register
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Charnockite Definition & Meaning
charnockite: [noun] any of a series of rocks ranging from granite to norite and pyroxenite all containing hypersthene.
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a, Charnockite; b, Khondalite and c, Leptynite.
The Khondalite and Charnockite group of rocks completely cover the research area ( Figure. 1) khondalites are not as hard as Charnockites and have a medium to coarse grain(N.subba Rao 2012). Due ...
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Mesoarchean charnockites from the Coorg Block, Southern …
The charnockite exposure in Kinningar near Dharmadhadka is a semi-elliptical quarry with an approximate height of 50 m and 120 m in width. The top portion is covered by a thick laterite cover of 3–10 m. Orthopyroxene-bearing greasy green charnockite shows evidence of shearing. Megascopically, the rock consists of coarse-grained quartz ...
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Charnockite massifs: key to tectonic evolution of Eastern …
Another charnockite massif in the EGP records concordant zircon spot age of 940 Ma, but single spot age of 990 Ma could indicate a prolonged UHT event. Thus magmatic charnockites of intracrustal ...
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Crystallization and melt extraction of a garnet-bearing charnockite …
The modeling results using reconstructed primary magma composition of the Yunlu charnockite combined with the orthopyroxene-garnet-plagioclase-quartz thermobarometry and fluid inclusion analyses suggest that the magma was emplaced at a pressure of ~600 MPa, a temperature of >900 °C, and an initial H 2 O content of ~4.0 wt% with rare CO 2 ...
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Weathering of charnockites and sediment production in
Charnockite is the dominant rock type of this area, which is, located well within the zone of transition between amphibolite and granulite facies. It is intruded by pink granite veins, pyroxenite and carbonatite bodies (Natarajan et al., 1994). A total of nine samples were collected from the area. Three samples (UL-F, UL-I and UL-W ...
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Review the charnockite problem, a twenty first century …
Discover the origins of charnockite rocks and the ongoing debate between their igneous and metamorphic origins. Explore the diverse field relations and structural settings of charnockites worldwide. Gain insights into the nomenclature challenges and propose a uniform approach. Delve into the metamorphic transformation and migmatisation processes.
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A review of the genetic mechanisms generating igneous charnockite…
Igneous charnockites are high-temperature orthopyroxene-bearing granitoids, which constitute an important part of many high-grade terranes. High temperature (typically >750–800 °C) is considered to be a key factor regarding the formation of igneous charnockites, because orthopyroxene reacts with hydrous melts to form biotite and/or amphibole at low temperatures …
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Petrogenesis and geological significance of charnockite in …
Charnockite has similar geochemical characteristics to felsic granulite, although it differs in having 1) an uneven distribution of major and trace elements; 2) strong depletions in the large-ion lithophile element Cs, the heat-producing elements U and Th, and the high-field-strength elements Nb, ...
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Charnockite: a candidate for 'Global Heritage Stone …
Charnockite is a mesocratic rock characterized by medium- to coarse-grained texture and inequigranular, interlobate to polygonal granoblastic textures with mutual interlocking of grains (Fig. 4a).
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A chip off the ol' charnockite
We visited the Philip Carter Winery this weekend with family. Baxter and I were pleased to see outcrops of charnockite scattered over the property (located in the middle of the Blue Ridge geologic province). As any 18-month-old will tell you, charnockite is a pyroxene-bearing granitoid. It's a distinctive and common rock type in ia's Proterozoic basement …
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Charnockites of the Central Part of the Anabar Shield: …
The oldest charnockite–granulite complexes are widespread on shields and provide insight into composition, growth, and evolution of early continental crust. The Anabar shield is …
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Charnockite and granite formation and influx of CO
The discovery, at Kabbaldurga quarry, Karnataka, south India1–3, of patches of charnockite apparently in an arrested state of development has refocused attention on the mechanism of charnockite ...
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Charnockites: Petrologic and phase equilibria …
This article reviews the petrology and formation conditions of charnockites, orthopyroxene-bearing granitoids, from various Precambrian high-grade metamorphic …
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Properties of Charnockite | Physical | Thermal
Physical Properties of Charnockite. Physical properties of rocks are used to identify the type of rocks and to discover more about them. There are various physical properties of Charnockite like Hardness, Grain Size, Fracture, Streak, Porosity, Luster, Strength etc which defines it.
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Nagercoil Charnockite: a Magnesian, Calcic to Calc-alkalic …
Garnet also occurs in the charnockite adjacent to calc-silicate enclaves such as in the Arakkakulam quarry (Figs 1b and 2d). Other than the interlayered charnockite–metasedimentary sequences in the northwestern part, recognizable supracrustal rocks are rare or absent towards the center of the massif.
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Charnockite: a candidate for 'Global Heritage Stone …
Charnockite is an excellent example of a heritage stone as it was extensively used from time immemorial on the Indian subcontinent. The Mahabalipuram temple complex (UN world heritage site ...
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The discovery of Charnockite – the rock of Charnock
Holland christened the rock as Charnockite after Job Charnock. St. Thomas Mount is a small hillock located in southern Chennai. The mount is named after St. Thomas, one of the 12 apostles of Jesus, and was instrumental in introducing Christianity to India. Today, a small shrine to St. Thomas, dating back to 1523, stands on top of the mount.
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Incipient charnockite formation at the waning stage of …
The incipient charnockite or orthopyroxene-bearing granitic orthogneiss is a relatively common constituent in ancient granulite-facies terranes, and its formation has been often attributed to an influx of CO 2-rich fluid or a removal of aqueous melt.Temporal relationship between the orthopyroxene formation and the fluid or melt migration, however, remains …
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R. A. Howie, Ph.D., F.G.S. Geology Charnockites
Charnockites are dark-coloured rocks with quartz, feldspar and orthopyroxene, often with garnet. They are mainly metamorphic and occur in Pre-Cambrian areas worldwide, especially in India.
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Charnockite
Charnockite is a type of granulite with hypersthene and garnet, formed by regional metamorphism of mafic and felsic rocks. Learn about the charnockite massifs in the Southern …
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The Western Charnockite Zone of the Eastern Ghats Belt, …
The Western Charnockite Zone (WCZ), which is made up by basic granulites and enderbites with minor charnockites and metasediments, abuts on Archaean cratonic nuclei in the west and the khondalitic lithounits of the EGB in the east. The Godavari Rift divides it …
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Charnockite | Granite-Gneiss, Igneous-Metamorphic, Magma
Charnockite is a granofels that contains orthopyroxene, quartz, and feldspar. It is a coarse-grained, greenish rock formed at high pressures in almost water-free conditions. Learn about its origin, composition, and uses.
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Global type area charnockites in southern India
2. Geological framework and type area charnockite. The SGT, south of the Dharwar craton is the wedge-shaped southern part of Peninsular India, composed of a number of distinct crustal blocks and intervening collisional sutures/shears which developed through multiple orogenic cycles during Mesoarchean to late Neoproterozoic-Cambrian (see Santosh, 2020 for …
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CHARNOCKITE
Charnockite ("Verde Butterfly Granite") from southeastern Brazil. This rock is a garnetiferous charnockite (it's also been called a hypersthene monzogranite). It formed during the late Neoproterozoic to Cambrian (~650-500 million years ago). It's got feldspar (greenish), pyroxene (black), quartz, and garnet (very deep red).
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Charnockite | SpringerLink
Charnockite is a dark, granitic rock with hypersthene and alkali feldspar, formed by metamorphism or migmatization of amphibolite or granulite. It is widespread in Peninsular India and some …
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Charnockite magmatism during a transitional phase: …
The charnockite suite has been divided into two textural types: porphyritic and coarse-grained, with a typical mineral assemblage of perthite, antiperthite, quartz, orthopyroxene, biotite and/or hornblende (Geng et al., 2004, Zhao et al., 2008).
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(a) K2O vs. K/Rb plot of the charnockite massifs
Download scientific diagram | (a) K2O vs. K/Rb plot of the charnockite massifs considered here from SGT and EGB. Open and closed symbols for the Nagercoil and Nilgiri hills massifs from SGT, and ...
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charnockite | Encyclopedia
charnockite A light-coloured, medium to coarse-grained igneous rock containing quartz and microcline feldspar (see ALKALI FELDSPAR) as major components with, in order of decreasing abundance, oligoclase feldspar (see PLAGIOCLASE FELDSPAR), hypersthene, biotite, and magnetite.Despite its low abundance, hypersthene (a calcium-poor, iron-rich pyroxene) is a …
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Petrology and geochemistry of charnockites (felsic ortho …
Charnockite associated with metapelites (para-charnockite?) In the KKB, orthopyroxene-bearing, felsic granulites are also observed in close association with extensively migmatised metapelites (Fig. 3 c). The interlayered nature of these granulites with rocks of definite sedimentary origin, suggests them to be of metasedimentary origin (para ...
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(PDF) Charnockite Bedrock, Chennai Coast, Tamil Nadu
(a) Charnockite rock and weathered soil samples SiO 2 % vs Al 2 O 3 % indicating insitu alteration. The red square is the data of the weathering rind.
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Charnockite: Mineral information, data and localities.
Charnockite mineral data, information about Charnockite, its properties and worldwide locations. Thank you for your donations large and small - we appreciate your ongoing support Log In …