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Field features and petrography used as indicators for the classification of Shigar valley pegmatites, Gilgit-Baltistan region of Pakistan

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Title: Field features and petrography used as indicators for the classification of Shigar valley pegmatites, Gilgit-Baltistan region of Pakistan

Authors: M. Hassan Agheem, Mohammad Tahir Shah, Tahseenullah Khan, Amanullah Laghari, Humaira Dars

Journal: Journal of Himalayan Earth Sciences

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Y 1900-01-01 2005-06-30

Publisher: University Of Peshawar, Peshawar.

Country: Pakistan

Year: 2011

Volume: 44

Issue: 2

Language: English

Keywords: Petrography; Classification; Pegmatites; Gemstones

Categories
Geology (2332) Earth Science (454) Gemology (10) Mineralogy (301) Petrology (306)

Abstract

On the basis of field features and petrography, Shigar valley pegmatites are classified broadly into Group-I and Group-II pegmatites. The Group-I pegmatites are further divided into muscovite-schorlberyl-garnet pegmatites and muscovite-schorl pegmatites. The muscovite-schorl-beryl-garnet pegmatites are more productive for gemstones. The Group-II pegmatites are classified as biotite ± garnet ± muscovite pegmatites and muscovite-biotite ± garnet pegmatites. The complete absence of biotite and the higher percentage of muscovite in the gemstone bearing class of pegmatites can be used as indicators for gemstone exploration.

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