Journal
JOURNAL OF EARTH SCIENCE
Volume 27, Issue 6, Pages 989-997Publisher
CHINA UNIV GEOSCIENCES, WUHAN
DOI: 10.1007/s12583-015-0643-7
Keywords
calcite; dolomite; metamorphic temperature; geothermometer; X-ray diffraction
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Funding
- Higher Education Commission (HEC), Pakistan
- National Academy of Sciences (USA) [131, 0521315]
- HEC, Pakistan
- Directorate of S T
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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 (similar to 500 A degrees C). The temperature reached during peak metamorphism of the investigated marble occurrence, based on calcitedolomite solvus was 628 A degrees C. Metamorphic temperatures derived from the present study were shown as a linear graph and values were in good agreement with the published literature.
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