Geochemistry of the late phanerozoic mafic dykes from the Moyar shear zone, South India, and its implications on the spatial extent of Deccan Large Igneous Province

Pratheesh, P.; Prasannakumar, V.; Praveen, K. R.

doi:10.1007/s12517-012-0609-3

Cited by 5 publications

(4 citation statements)

References 42 publications

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“…Mafic dykes especially the dolerite dykes are well documented in the Peninsular India (Ernst and Srivastava, 2008;Pratheesh et al, 2011;Pivarunas et al, 2019;Srivastava et al, 2008Srivastava et al, , 2022Ramachandran et al, 2023a, b). The dolerites in the northern part of the Southern Granulite Terrain (SGT) are the northernmost intrusion in Tamil Nadu.…”

Section: Geological Settingmentioning

confidence: 99%

Geochemistry, Petrology and Tectonic Settings of Dolerite Dykes of Ranipet District, Northern part of Southern Granulite Terrain, Tamil Nadu, India

Rameshkumar,

Thirunavukkarasu,

Ramachandran

et al. 2024

Journ. Geol., Geogr., and Geoec..

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The dolerite dykes and their associated rock are collected from the Ranipet district which is located in the northern part of the Southern Granulite Terrain and South of the Dharwar craton. The major dyke in the Ranipet district shows WSW-ENE trending dykes intruded the hornblende-biotite gneiss with gabbroic diorite and granite gneiss. The dolerite in this region shows typical dolerite composition with high alteration like chloritization and sericitization. Mineralogically, the rock shows laths of plagioclase, anhedral to euhedral clinopyroxene with basal cleavage, and quartz minerals. The opaque minerals ilmenite and magnetite crystals interstice the major minerals and it has altered boundaries. Texturally, the rock shows subophitic and intermediate gabbroic texture (granular texture). TAS diagram shows that the dykes plot in the basalt, basalt andesitic, and rhyolitic field (highly sericitized dolerite). The host and other associated rocks plot within the sub-alkaline field. The bivariate plot for the studied dolerite shows a positive correlation with SiO2, CaO, Na2O, K2O, and P2O5 and a negative correlation with TiO2, Fe2O, and Al2O3. The AFM and Jensen plots show that the dolerites samples plot in the tholeiitic field with Fe enrichment and a High Fe tholeiitic character respectively. The primitive mantle diagram shows the depletion of Nb, P, and Ti showing possible interaction of crust during the emplacement. The Chondrite normalized plot for the dolerite shows enrichment of LREE and Slight depletion of HREEs indicates OIB character. Tectonically, the dolerites formed emplaced in the continental and alkaline arc OIB settings with E-MORB affinity.

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Section: Geological Settingmentioning

confidence: 99%

Geochemistry, Petrology and Tectonic Settings of Dolerite Dykes of Ranipet District, Northern part of Southern Granulite Terrain, Tamil Nadu, India

Rameshkumar,

Thirunavukkarasu,

Ramachandran

et al. 2024

Journ. Geol., Geogr., and Geoec..

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“…This kind of alteration contrasts with the normal progression of coal rank which is a regional and slow process in response to normal, rather than abnormal, upper crustal temperatures [22]. Compared with coal during normal coalification, thermally altered coal has typical physicochemical characteristics [10,11,13,19,20]. For example, the vitrinite reflectance of coal increases, but the moisture, volatile matter, and hydrogen content decrease as the distance from the intrusion decreases.…”

Section: Introductionmentioning

confidence: 95%

“…Thermal events related to igneous intrusion are relatively common in many countries in the world, and a large number of studies have been conducted on the impact of igneous intrusion on coal [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Especially, research has been carried out on some representative coalfields i.e., the Illinois, Raton and San Juan Basins in the USA, the Gunnedah Basin and Bowen Basin in Australia, and the Qinshui, Fushun and Tiefa Basins in China [6,8,10,11,[18][19][20][21]. In these coalfields, some coal seams and their surrounding rocks were invaded by dikes, sills, and other types of igneous rocks.…”

Section: Introductionmentioning

confidence: 99%

Mineral Composition and Graphitization Structure Characteristics of Contact Thermally Altered Coal

et al. 2022

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Contact metamorphism in coal is usually characterized by a rapid, brief, and exotherm reaction that can change the geothermal gradient. In this process, coal adjacent to the intrusive body can form thermally altered coal-based graphite (TACG). In order to further study the structural changes of TACG at different distances from the intrusive body, four TACG samples were collected in the Zhuji coal mine in the Huainan Coalfield, North China, and their vitrinite reflectance and Raman spectra were measured using polarizing microscopy and Raman spectroscopy. The results showed that: (1) affected by the temperature and stress of magmatic hydrothermal intrusion, the clay minerals in the coal seams appeared distributed in strips; the occurrence of ankerite and pyrite in the coal seams near the magmatic intrusions could be due to a late magmatic hydrothermal mineralization; (2) the Rmax − Rmin correlation for the TACG samples under study showed that thermal metamorphism was the main factor leading to the graphitization of the TACG samples, without an obvious pressure effect; (3) with the increase of the graphitization process, the D- and G-band showed some similar changes, specifically, their peak positions shifted to lower wave numbers, and the full width at half maximum (FWG and FWD) gradually decreased; the difference was that the intensity of the G-band increased, while that of the D-band decreased; (4) the graphitization degree of the TACG samples increased with the increase of the transverse size of the crystals, while the FWG and FWD values of the G- and D-band decreased; (5) in comparison to natural graphite, the TACG still presented structural defects.

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“…The spatial structure of minerals is a fundamental factor in determining the morphology, physical properties, and genesis of minerals [1][2][3][4]. Today, characterization techniques used to investigate various features of the spatial structure of minerals include X-ray diffraction (XRD), thermogravimetric analysis (TG), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy (Raman), and morphological observation techniques such as scanning electron microscopy (SEM) and atomic force microscopy (AFM) [5,6].…”

Section: Introductionmentioning

confidence: 99%

Editorial for the Special Issue: “Spatial Structure of Minerals”

Wu,

Hu,

Gao

2023

Molecules

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Geochemistry of the late phanerozoic mafic dykes from the Moyar shear zone, South India, and its implications on the spatial extent of Deccan Large Igneous Province

Cited by 5 publications

References 42 publications

Geochemistry, Petrology and Tectonic Settings of Dolerite Dykes of Ranipet District, Northern part of Southern Granulite Terrain, Tamil Nadu, India

Geochemistry, Petrology and Tectonic Settings of Dolerite Dykes of Ranipet District, Northern part of Southern Granulite Terrain, Tamil Nadu, India

Mineral Composition and Graphitization Structure Characteristics of Contact Thermally Altered Coal

Editorial for the Special Issue: “Spatial Structure of Minerals”

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