PETROLOGICAL AND GEOCHEMICAL STUDIES OF PRECAMBRIAN GRANITOIDS FROM CHERLAPALLY AREA, NALGONDA DISTRICT, TELANGANA STATE, INDIA

Granitoids from Cherlapally area of Nalgonda District are mainly classified into grey and pink granites and migmatites. They occasionally contain older mafic enclaves and are cut by younger dolerite dykes, alaskites and quartz veins. Granitoids form elongated ridges, small mounds, sheeted outcrops a...

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Published inJournal of applied geochemists Vol. 21; no. 3; pp. 311 - 316
Main Authors Anjaneyulu, M, Nagaraju, K, Reddy, I Panduranga
Format Journal Article
LanguageEnglish
Published Hyderabad Indian Society of Applied Geochemists (ISAG) 01.07.2019
Subjects
Biotite
Chlorite
Classification
Classification schemes
Crystallization
Feldspars
Fractionation
Geochemistry
Igneous rocks
Iron oxides
Lava
Magma
Minerals
Mounds
Ocean circulation
Outcrops
Petrography
Petrology
Plagioclase
Precambrian
Quartz
Ridges
Silica
Silicon dioxide
Stone
Studies
Titanium dioxide
Upwelling
New York
United States > US
India
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Summary:Granitoids from Cherlapally area of Nalgonda District are mainly classified into grey and pink granites and migmatites. They occasionally contain older mafic enclaves and are cut by younger dolerite dykes, alaskites and quartz veins. Granitoids form elongated ridges, small mounds, sheeted outcrops and batholithic domes in the study area. They are characterized by massive interlocking granular structure with coarse grained phaneritic texture. They are mainly composed of feldspar (microcline and plagioclase) and quartz as essential minerals. Biotite and hornblende form minor minerals, chlorite, epidote and iron oxide occur in trace amounts They plot in the restricted field of monzogranite on QAP diagram. The negative correlation between SiO2 vs. CaO, TiO2 and MgO indicates plagioclase fractionation as well as differential crystallization and hence there have been classified as monzogranites. These granitoids are subsolvus in character due the presence of two feldspars that were formed at below solvus (<4000C) temperature under wet conditions. Based on integrated field, petrography and geochemical studies it is suggested that these granitoids were generated by partial melting of lower crust due to magma upwelling.
ISSN:0972-1967
2319-4316