Petrographic and Geochemical Analyses of Kirana Hills Shield Rocks around Sargodha and Economic Potential

International Journal of Economic and Environment Geology

卷:8

Muhammad Saqib Izhar¹  Muhammad Waseem Khan¹  Iftikhar Alam¹  Syed Abbas Sultan¹ 

[1] Atomic Energy Minerals Centre, Lahore-54600, Pakistan;

关键词: http://www.econ-environ-geol.org/pdf/aug2017/2.pdf;    Mineral;    petrographic;    chemical analyses;    rhyolite;    hydrothermal alterations;    Kirana Hills.;   

DOI  :  

来源: DOAJ

【 摘 要 】

The present study deals with geochemical and petrographic analysis of the Kirana Hill shield rocks ofPunjab plains from Buland, Hachi, Shaheen Abad, Shaikh and Machh hills. On basis of the current studies certainmodifications have been made in the classification and nomenclature of rocks exposed in the study areas. Chemicalanalyses have also been carried out in order to calculate Cross Iddings, Pirsson, and Washington (CIPW) norms”, tostrengthen nomenclature scheme and finally rocks are classified by using “MAGMA SOFTWARE”. Rhyolitespredominate over the basalts/dolerites, andesites, and phyllite/ slate. Rhyolitic rocks are light grey, greenish grey andlight brown in color, aphanitic in nature. The observed microscopic textures are aphyric, phyric or porphyritic andmicropoikilitc. Moreover, some rhyolitic rocks also show flow texture. They are either cryptocrystalline tomicrocrystalline or microcrystalline to cryptocrystalline. No glassy material has been observed in any thin section.Mafic rocks are characterized by the presence of ferromagnesian minerals with plagioclase. Andesites exhibit mainlyporphyritic texture, but aphyric texture has also been observed in few samples. Hydrothermal alterations are also verycommon in these rocks. Other rock assemblages identified during laboratory studies from Kirana area include: tuffs i.e.(Lithic Crystal Tuff and Lithic Tuff), basaltic andesite, rhyodacite/ dacite, slate/ phyllite, ankeritic rocks/ veins andquartzofeldspathic veins. Our studies also reveal that no evidence of quartzite has been found in the samples collectedfrom above mentioned areas of Kirana, although it has been reported in previous literature. Iron (Fe) has been observedin rhyolite as well as other volcanic rocks of Kirana hills, its presence suggests magma from deep mantle instead ofcrustal melting / anatexis. In the present analysis some primary and secondary copper minerals including chalcopyrite,atacamite and malachite have been identified. Some anomalous values of the Rare Earth Elements are also observed.Inclusive geological investigations are recommended for better studies to appraise the potential of Iron (Fe), Copper(Cu) and trace/Rare Earth Elements (REE) in the area.

【 授权许可】

Unknown