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- Title
Diagenetic talc of Jhiroli, Kumaun Himalaya.
- Authors
Sengupta, H. P.; Yadav, R. N.
- Abstract
Talc/soapstone deposit of Kumaun Lesser Himalaya is mainly associated with magnesite. It occurs in small, irregular patches and pockets within the magnesite and sometimes with dolomite. Talc in the interstitial spaces of magnesite occurs as fillings of stylolitic veins, as well as in patches heavily corroding the magnesite grains lying in contact. Tremolite, chlorite and other low grade metamorphic minerals are absent while chalcedony is sometimes present in intimate association with talc in the stylolitic veins and in the patches. Talc is extremely fine-grained, sometimes scaly and at times fibrous. These features indicate that talc is neither hydrothermal in origin nor is produced by stresses acting on the carbonate rock. Presence of pyrite grains in talc and host magnesite is indicative of a reducing environment. X-ray diffraction and infrared studies reveal that there is no other metamorphic mineral present. Fluid-inclusion study of host magnesite suggests that the minimum temperature of homogenization (Th) ranges between 220 and 300°C. The antipathic relationship between silica and talc suggests that the latter is a product of diagenetic processes, being formed by reaction of magnesite and silica at temperature less than 300°C.
- Subjects
HIMALAYA Mountains; SOAPSTONE; MAGNESITE; DOLOMITE; TREMOLITE; HYDROTHERMAL deposits
- Publication
Current Science (00113891), 2007, Vol 92, Issue 1, p99
- ISSN
0011-3891
- Publication type
Article