The present study reinvestigates the alteration at the type localities by the method of mass-balance. The mass changes deduced, together with the revised …

Tìm hiểu thêm

A greasy charnockite (below the pen) layer occur at the margin of a mafic granulite body along with two distinct components of Peninsular gneiss, pink granite without perceptible gneissic fabric and light grey granitic gneiss with gneissic fabric at acute angle to the pink granite layer. While the pink-granite layer may be related to the gneiss ...

Tìm hiểu thêm

charophytes A group of plants the members of which are usually regarded as algae, although they resemble bryophytes in the structure of the male gametes and in the presence of a sterile envelope enclosing the organs. Many species are heavily calcified. Fossil charophytes (from the Triassic onwards) are known only by their calcified …

Tìm hiểu thêm

Charnockite: a candidate for 'Global Heritage Stone Resource' designation from India. C. Sreejith 1*, E. A. Del Lama 2, Gurmeet Kaur 3. 1 Department of Geology, MES Ponnani College, University of Calicut, Kerala–679586, India 2 Instituto de Geociências, Universidade de São Paulo, Rua do Lago, 562, CEP 05580-080 São …

Tìm hiểu thêm

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). It

Tìm hiểu thêm

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 …

Tìm hiểu thêm

Charnockite is present in both massifs, and is overlain unconformably by the Neoproterozoic Catoctin Basalt Formation in much of the outcrops. The overwhelming consensus is that the charnockite basement is much older than the Catoctin basalts, with the charnockite dated to 1021 ± 36 Ma (Pettingill et al. 1984) and the Catoctin dated

Tìm hiểu thêm

Job Charnock's mausoleum in Kolkata was built with stones brought in all the way from Chennai – a rock christened Charnockite. Job Charnock was the chief agent of Bengal under the East India Company. On August 24, 1690, Charnock arrived in Sutanuti village (present day north Kolkata) with a permission from the last Mughal emperor, …

Tìm hiểu thêm

Charnockite group and Migmatite group, which forms the geological foundation of the area. Khondolite group is composed of garnetiferous biotite - sillimanite gneiss, with occasional bands of calc granulite and quartzite and constitutes the major rock type. Charnockite are acidic to intermediate in composition. Irregular patches of

Tìm hiểu thêm

In this work, PIXE has been used for a variety of Precambrian proto crustal rocks in the form of granulitic charnockites,Eastern Ghats AP,India.In previous study of exterior part of the charnockite hill elemental analysis using electron microprobe analysis, the elements in host charnockites no Na, traces of Mn,Ca and high Ti,Cl,F (Biotite), no …

Tìm hiểu thêm

In order to unravel the complex processes involved in the formation and tectonic evolution of the Igarra Schist Belt during the Neoproterozoic, detailed field, …

Tìm hiểu thêm

Zircon grains from the charnockite and leucogneiss show zoned magmatic cores surrounded by structureless metamorphic rims. Magmatic zircon grains from the charnockites show ages ranging from 1983 ± 8.8 Ma to 2046 ± 14 Ma, and the metamorphic domains show an age range of 502 ± 14 Ma to 547 ± 8.7 Ma.

Tìm hiểu thêm

In this study, the Varberg charnockite and adjoining cogenetic Torpa granite, located in the SW Swedish granulite region along the Kattegat coast at Varberg, are described in detail from the standpoint of their petrology, mineral compositions, mineral textures, whole-rock chemistry, and fluid inclusions. Their proximity to each other and ...

Tìm hiểu thêm

In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list. ... charnockite. Charnock, Thomas (1526-1581)

Tìm hiểu thêm

Abstract. Beginning of the twentieth century was marked by coinage of a new rock name, Charnockite, first described as a hypersthene-bearing granite from Southern India. Since then charnockites have been described from most of the conti-nents and mostly restricted to high-grade belts. Later half of the last century saw a lively debate over an ...

Tìm hiểu thêm

1. Introduction. Charnockites have been the subject of much research during the past century, because they are an important part of high-grade terranes and have played a crucial role in the growth and differentiation of the continental crust (e.g., Fyfe, 1973; Vielzeuf et al., 1990; Zhai and Santosh, 2011; Milidragovic and Francis, 2014; Zhao et …

Tìm hiểu thêm

A review of the genetic mechanisms generating igneous charnockite: CO2 flushing and crystal-melt segregation in mushy reservoirs @article{Zhao2022ARO, title={A review of the genetic mechanisms generating igneous charnockite: CO2 flushing and crystal-melt segregation in mushy reservoirs}, author={Kai Zhao and Xi‐sheng Xu and …

Tìm hiểu thêm

Southern India and Sri-Lanka are the places where "incipient charnockites", i.e. the local transformation of amphibolite-facies gneisses into orthopyroxene-bearing, igneous looking charnockites, have been discovered in the early sixties. The fact that some incipient charnockites occur along a network of brittle fractures, together with CO 2 …

Tìm hiểu thêm

Holland was convinced that the charnockites in southern India were magmatic in origin. Further, he also recognised that at the type locality charnockite …

Tìm hiểu thêm

The NRG's Mawson Charnockite specimens in a barge on their way to the research vessel Aurora Australia moored in Horseshoe Harbour. Image courtesy Australian Antarctic Division. After funds were raised to cover the costs of the long haul from Hobart to the ACT, the rocks were placed on a truck and moved to the NRG's rock storage site in ...

Tìm hiểu thêm

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, …

Tìm hiểu thêm

charnockite A light-coloured, medium to coarse-grained igneous rock containing quartz and microcline feldspar (see ALKALI FELDSPAR) as major components with, …

Tìm hiểu thêm

This implies two-phase emplacement of the charnockite magma which can be correlated with the tectonometamorphic evolution of the province. While the earlier pulse of charnockite magmatism is broadly synchronous with the first cycle (M 1) of metamorphism, the later pulse followed when the lower crust was still hot. The two …

Tìm hiểu thêm

The felsic charnockite massif has a dominant mineralogy of qtz-kfs-plg-opx-mt-il-zr-ap±hbl±bt. The intermediate charnockite massif is distinguished from the felsic type by their relatively low K-feldspar contents, greater mafic mineral contents and the occurrence of clinopyroxene (Chacko et al. 1992).

Tìm hiểu thêm

Incipient charnockite is a peak-metamorphic product of biotite-dehydration melting. • Prolonged granitic magmatism, granulite-facies metamorphism, and fluid influx …

Tìm hiểu thêm

Charnockite, any member of a series of metamorphic rocks with variable chemical composition, first described from the state of Tamil Nadu in southern India and named for Job Charnock. The term is often limited to the characteristic orthopyroxene …

Tìm hiểu thêm

Charnockite magmatism was roughly contemporaneous with the emplacement of a large belt of shallow granites and felsic volcanic rocks in the SW Guiana Shield. Despite their similar age, the inherited zircon populations suggest that the charnockites are derived from a distinct, juvenile source while the felsic volcanic rocks include an Archaean ...

Tìm hiểu thêm

Generally, charnockite is anhydrous and essentially consists of orthopyroxene as its character-defining ferromagnetic mineral along with quartz and feldspar. The Naming of Charnockite Rocks. As iterated earlier, charnockite rocks were earlier thought of to be igneous rocks. It was believed that charnockite rocks are formed …

Tìm hiểu thêm

Charnockite. Part of the Encyclopedia of Earth Science book series (EESS) Charnockite is a felsic, melanocratic, holocrystalline, alkali granitic rock first described from the …

Tìm hiểu thêm

Here, we report on adakitic magnesian charnockites (i.e., hypersthene-bearing diorites and granodiorites) near Milin, in eastern Gangdese, that provide new insights into the crustal growth process of the region. Zircon U-Pb analyses of seven charnockite samples indicate that they were generated in the Late Cretaceous (100-89Ma).

Tìm hiểu thêm

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 (UNESCO world heritage site ...

Tìm hiểu thêm

Charnockite is frequently described as an orthopyroxene granite. Granites are felsic rocks that usually contain no or very little pyroxene. There is actually an entire array of rocks (mostly granitoids but also syenite, …

Tìm hiểu thêm

charnockite (which is part of the Lofoten suite). After emplacement, the charnockite of Hopen underwent high-pressure metamorphism, which converted fayalite+quartz to orthopyroxene (Ormaasen, 1977). Ormaasen (1977) thus recognizes two types of charnockites in the Hopen. Charnockite I retains primary Opx, whereas in Charnockite

Tìm hiểu thêm