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Zainuddin, Syed M.
- Geochemistry of the Panjal Traps of Mount Kayol, Lidderwat, Pahalgam, Kashmir
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1 Department of Geology, Aligarh Muslim University, Aligarh, IN
1 Department of Geology, Aligarh Muslim University, Aligarh, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 19, No 9 (1978), Pagination: 403-410Abstract
Chemical analysis of 62 rock samples representing 24 flows of the Panjal Traps on Mount Kayol in Lidder Valley area do not show any systematic variation of the various oxides from the base to the top. The plots on MgO-Al/Si diagram of Murata, and Fe2O3/FeO ratio indicate that the rocks are of tholeiitic lineage. However, the points fall within the fields of alkali-olivine basalt and high-alumina basalt on the alkali-silica diagram of Kuno. This is interpreted to be due to alkali metasomatism. The addition of alkali is probably responsible for the shift of the points to the alkali-olivine basalt field on the alkali-silica diagram.The Solidification Index (MgO × 100/MgO+Fe2O3+FeO+Na2O+K2O) lies within the range of basalt and basaltic andesite of 'pigeonite rock series'.
- Geochemistry and Genesis of the Abar River Granite, Northwest of Udaipur City, Rajasthan
Abstract Views :206 |
PDF Views:3
Authors
Affiliations
1 Department of Geology, Aligarh Muslim University, Aligarh 202 002, IN
1 Department of Geology, Aligarh Muslim University, Aligarh 202 002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 35, No 6 (1990), Pagination: 620-630Abstract
The granite is fine-to coarse-grained and constitutes mainly of quartz; K-feldspar and plagioclase. Among accessories, muscovite, biotite, chlorite, zircon, apatite and sphene are common. K-feldspar is generally microcline with perthitic intergrowth. The albite grains have similar optical orientation as that of the microcline; they are inferred to have formed by the ionic exchange of K by Na. The rock ranges in composition from granodiorite to granite. Variation trends of the plots of major and trace elements on Harker's diagram indicate that the granite is not formed by a simple fractional crystallization or partial melting of common homogeneous source. Plots on Rb, Ba and Sr ternary diagram reveal that it is a least differentiated normal granite type. Molar concentration of Al/(Na+K+Ca) > 1.1 and Rb/Sr ratio of 0.53 indicate a peraluminous source of the granitic magma. High silica content, and the mineral assemblages of the granite correspond to S-type granite.Keywords
Ahar Granite, Geochemistry, Petrography (Igneous), Rajasthan.- Geochemical Characteristics of the Granites of Bundelkhand Massif, Central India
Abstract Views :178 |
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Authors
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1 Department of Geology, Aligarh Muslim University, Aligarh - 202002, IN
1 Department of Geology, Aligarh Muslim University, Aligarh - 202002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 50, No 1 (1997), Pagination: 69-74Abstract
The Bundelkhand massif comprises various types of granites. On the basis of field relations, three compositionally distinct granitic phases have been delineated. These are hornblende granite, biotite granite and leuco granite in stratigraphic sequence. The major elements variations against SiO2, display smooth trends which should be expected for a composite massif evolved by fractionai crystallization. The variations of incompatible elements compared to the compatible elements suggest a partial melting process for the evolution of the massif.Keywords
Petrogenesis, Geochemistry, Bundelkhand, Granites, Central India.- Petrology of the Bundelkhand Granites near Mahoba, District Hamirpur, U. P.
Abstract Views :155 |
PDF Views:109
Authors
Affiliations
1 Department of Geology, Aligarh Muslim University, Aligarh 202001, IN
1 Department of Geology, Aligarh Muslim University, Aligarh 202001, IN