Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

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Occurrence of Rhyolitic Dykes within the Mt. Abu Batholith, Southwestern Rajasthan


Affiliations
1 Geology Laboratory, Department of Civil Engineering, Institute of Technology, Banaras Hindu University, Varanasi- 221 005, India
2 Department of Geology, Banaras Hindu University, Varanasi - 221 005, India
     

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The occurrence of Malani rhyolites as dykes within the Mt. Abu batholith has been studied. The Mt. Abu rhyolitic dykes are peraluminous and of subalkaline nature. These are enriched in trace elements such as Rb, Nb, Zr, Y, Ga, Th and Zn, and depleted in Ba and Sr resulting in high K/Rb, Rb/Sr, Ba/Sr and Ga/AI ratios. The geochemical characters indicate Mt. Abu rhyoiitic dykes to be A-Type, within-Plate granites (WPG) with high SiO2, Na2O + K2O and Fe/Mg. These rhyolites are likely to have formed in anorogenic Rift-Related setting and the volcanism may be correlated to early stages of Pan-African magmatic event (850-750 Ma).

Keywords

Rhyolite, Geochemistry, Mt. Abu Batholith, Rajasthan.
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  • Occurrence of Rhyolitic Dykes within the Mt. Abu Batholith, Southwestern Rajasthan

Abstract Views: 168  |  PDF Views: 2

Authors

B. N. Singh
Geology Laboratory, Department of Civil Engineering, Institute of Technology, Banaras Hindu University, Varanasi- 221 005, India
Mallickarjun Joshi
Department of Geology, Banaras Hindu University, Varanasi - 221 005, India

Abstract


The occurrence of Malani rhyolites as dykes within the Mt. Abu batholith has been studied. The Mt. Abu rhyolitic dykes are peraluminous and of subalkaline nature. These are enriched in trace elements such as Rb, Nb, Zr, Y, Ga, Th and Zn, and depleted in Ba and Sr resulting in high K/Rb, Rb/Sr, Ba/Sr and Ga/AI ratios. The geochemical characters indicate Mt. Abu rhyoiitic dykes to be A-Type, within-Plate granites (WPG) with high SiO2, Na2O + K2O and Fe/Mg. These rhyolites are likely to have formed in anorogenic Rift-Related setting and the volcanism may be correlated to early stages of Pan-African magmatic event (850-750 Ma).

Keywords


Rhyolite, Geochemistry, Mt. Abu Batholith, Rajasthan.