Metamorphic Temperature Investigation of Coexisting Calcite and Dolomite Marble Examples from Nikani Ghar Marble and Nowshera Formation,Peshawar Basin,Pakistan  

作　　者：Muhammad Fahad Yaseen Iqbal Mohammad Riaz Rick Ubic Simon A. T. Redfern 

机构地区：[1]Department of Electrical Engineering, COMSATS Institute of Information Technology, Abbottabad 22010, Pakistan [2]Materials Research Laboratory, Department of Physics, University of Peshawar, Peshawar 25120, Pakistan [3]National Centre of Excellence in Geology, University ofPeshawar, Peshawar 25120, Pakistan [4]College of Engineering Boise State University, Boise 83401, USA [5]Department of Earth Sciences, University of Cambridge, Cambridge 999020, United Kingdom

出　　处：《Journal of Earth Science》2016年第6期989-997,共9页地球科学学刊（英文版）

基　　金：the financial support extended by the Higher Education Commission (HEC),Pakistan and National Academy of Sciences (USA),project ID 131,under the PAK-USA S & T Cooperation Program,Award (No.0521315);the HEC,Pakistan for their support in the form of “International Research Support Initiative Program (IRSIP)” to conduct a part of research at Department of Earth Sciences,University of Cambridge,UnitedKingdom;financial support extended by the Directorate of S & T,KP regarding minerals upgradation

摘　　要：Using marble samples from the Nikani Ghar marble and Nowshera Formation from Northern Pakistan the determination of the temperature of metamorphism was undertaken with the help of calcite-dolomite solvus geothermometer. Two types of marbles, that is, calcite-dolomite marble and quartz-bearing calcite-dolomite marble were selected. Petrographic and scanning electron microscope analysis of dolomite samples indicated different grain sizes. X-ray diffraction technique indicated the calcites MgCO3 content up to 7.93 mol.%. Nikani Ghar marble samples have shown lower contents of MgCO3 as compared to samples from Nowshera Formation. The calcite-dolomite-quartz marble has also showed relatively lower MgCO3 content and hence rather low temperature （-500 ℃）. The temperature reached during peak metamorphism of the investigated marble occurrence, based on calcitedolomite solvus was 628 ℃. Metamorphic temperatures derived from the present study were shown as a linear graph and values were in good agreement with the published literature.Using marble samples from the Nikani Ghar marble and Nowshera Formation from Northern Pakistan the determination of the temperature of metamorphism was undertaken with the help of calcite-dolomite solvus geothermometer. Two types of marbles, that is, calcite-dolomite marble and quartz-bearing calcite-dolomite marble were selected. Petrographic and scanning electron microscope analysis of dolomite samples indicated different grain sizes. X-ray diffraction technique indicated the calcites MgCO3 content up to 7.93 mol.%. Nikani Ghar marble samples have shown lower contents of MgCO3 as compared to samples from Nowshera Formation. The calcite-dolomite-quartz marble has also showed relatively lower MgCO3 content and hence rather low temperature （-500 ℃）. The temperature reached during peak metamorphism of the investigated marble occurrence, based on calcitedolomite solvus was 628 ℃. Metamorphic temperatures derived from the present study were shown as a linear graph and values were in good agreement with the published literature.

关 键 词：CALCITE DOLOMITE metamorphic temperature GEOTHERMOMETER X-ray diffraction. 

分 类 号：P588.3[天文地球—岩石学] P578.61[天文地球—地质学]