Petrography of The Upper Litra and Chaudhwan Formations, Upper Siwalik Group, Zinda Pir Anticline, Northern Sulaiman Range
Abstract
The Zinda pir anticline of northern Sulaiman fold belt exposes, along its periphery, the Siwalik Group which comprises Vihowa, Litra and Chaudhwan Formations (in younging order). Petrographic studies of the upper Litra and Chaudhwan Formations indicate that the sandstones of these formations are texturaly similar. Moderate angularity and sorting, along with high content of feldspar, indicate textural imaturity of these sandstones. The Litra Formation is characterised by the abundance of almandine garnet and blue-green hornblende, indicating substantial contribution from the northern provenance (i.e., Kohistan island arc). Whereas petromict orthocongtomerates of the Chaudhwan Formation indicate a predominant western provenance (i.e., Fort Monro anticline).
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