The lithofacies and grain size analysis of the Misri Banda quartzite in District Nowshera, Khyber Pakhtunkhwa, Pakistan.
Byline: Hamad Khan, Abdus Saboor, Azhar ul Haq, Kashif Ullah and Shakir Ullah
The Ordovician Misri Banda quartzite of Peshawar Basin is approximately 120m thick and the sandstone, exposed in Misri Banda village,was investigated for the grain size and lithofacies analysis. The sandstone is mainly composed of thin to thick bedded, gray to whitish gray to brown sandstone that is fine to medium grained and displays some laminations, ripple marks, flat beds and cross beds at places. The sandstone under the petrographic microscope contains ferruginous matrix, lithics (shale rock fragments) and some ore minerals. Grain size parameters like mean size, sorting, skewness and kurtosis of the rock unit were determined. Based on field and petrographic data, two lithofacies were recognized in the unit by following Folk (1970) classification of sandstones. These lithofacies includeLF-1 (Sub Feldsarenite Facies) and LF-2 (Sub Litharenite Facies). The LF-1 is interpreted to represent tidal environment whereas LF-2 is interpreted to represent beach environment.
On the basis of grain size analysis i.e.,grain-sizebivariate plot,the Misri Banda quartzite is deposited in beach environment with some influx from the:fluvial settings.
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|Publication:||Journal of Himalayan Earth Sciences|
|Date:||Dec 31, 2016|
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