The present study aims to evaluate the microfacies attributes and planktonic foraminiferal biostratigraphy of the late Cretaceous Parh Formation of the Kirthar Range and their implications for the ophiolitic emplacement. Two planktonic foraminiferal biozones were identified namely Dicarinella asymetrica and Globotruncanita elevata biozones suggesting Santonian to Campanian age to the carbonate unit of Parh Formation. The detailed petrographic studies divulged four microfacies showing deposition in the middle shelf to deep basin. Based on facies variation and foraminiferal ecology, six transgressive and regressive sequences were identified. The facies distribution shows diverse fluctuation in sea level during deposition of the rock unit. Although the Campanian pelagic limestone is interbedded with Waziristan ophiolites and its synchronous sedimentary and volcanic interbedded sequence are also recorded in Chagai and Raskoh arc. However, the final emplacement of ophiolite on the northwestern margin of the Indian plate is recorded later in Maastrichtian and early Paleocene. Furthermore, lateral facies variations of the Parh Formation, its diverse lower and upper contacts as well as variation in thicknesses are caused by paleobathymetry due to the underlying hotspots. The hotspots have caused the outpouring of massive volcanic lava resulting in the formation of Bibai volcanics and Deccan Trap.

本研究的目的是评估基尔萨尔山脉晚白垩世Parh组的微相属性和浮游有孔虫生物地层及其对蛇纹石沉积的影响。确定了两个浮游有孔虫生物区，即非双歧小car虫和高地Globotruncanita高地。这些生物带暗示了桑顿期至坎帕尼亚期至帕尔组的碳酸盐岩单元。详细的岩石学研究揭示了四个微相，显示了中层架至深盆的沉积。根据相变和有孔虫生态学，确定了六个海侵和回归序列。相分布表明在岩石单元沉积过程中海平面的不同波动。尽管Campanian中上层石灰岩与Waziristan蛇绿岩互层，并且在Chagai和Raskoh弧中也记录了它的同步沉积和火山互层序列。然而，在马斯特里赫特和古新世早期，记录了蛇绿岩在印度板块西北边缘的最终位置。此外，帕尔组的横向相变化，由于潜在的热点，古生物计量法导致其上下接触的多样性以及厚度的变化。热点导致大量的火山熔岩倾泻而出，导致了Bibai火山和Deccan圈闭的形成。