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Mukherjee, Barun K.
- Brine-Rich Hydrothermal Fluid Circulation in the Upper Level of Nidar Ophiolite Sequence, Ladakh:Evidences from Fluid Inclusions
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Authors
Affiliations
1 Wadia Institute of Himalayan Geology, DehraDun - 248 001, IN
2 Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Tokyo, JP
3 Department of Geology, Delhi University , Delhi 110 007, IN
1 Wadia Institute of Himalayan Geology, DehraDun - 248 001, IN
2 Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Tokyo, JP
3 Department of Geology, Delhi University , Delhi 110 007, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 70, No 5 (2007), Pagination: 780-786Abstract
Microthermometric study of fluid inclusions in gabbro from the Nidar ophiolitic sequence revealed that brine rich fluid (34-45 wt% NaC1) at the temperature of more than 400°C were predominant throughout the gabbro High saline inclusion homogenized by halite dissolution at the temperature of 276-400°C. All the moderate to high temperature(l30-390°C) inclusions are liquid and vapour dominated, commonly secondary in origin, majority having seawater-Like salinity( 17- 8 wt% NaC1).The highly saline fluid was probably derived by phase separation of hydrothermal seawater or an exsolved magmatic aqueous phase at the temperature of 250-412°C. The migration of the Phase-Separated along fractures resulted in segregation of the vapour and brines and preferential entrapment of High-Saline inclusions at depth. These brines may have originated when seawater approached the top of the magma chamber. The subsequent fracturing of the gabbro at the temperature of 130-390°C facilitated the entry of seawater which pervasively altered the gabbro. This hydration processes resulted into the formation of secondary minerals or by mixing with Phase-Separated fluid, resulting in salinities Two-Times higher than that of seawater.
Keywords
Brine, Fluld Inclusions, Nidar Ophiolite, Ladakh.
- Geochemical analysis and scientific conservation of the exterior surface of the ancient Kedarnath temple, Uttarakhand, India
Abstract Views :184 |
PDF Views:78
Authors
Affiliations
1 Archaeological Survey of India (Science Branch), 29, New Cantt Road, Dehradun 284 001, IN
2 Wadia Institute of Himalayan Geology, G. M. S. Road, Dehradun 284 001, IN
1 Archaeological Survey of India (Science Branch), 29, New Cantt Road, Dehradun 284 001, IN
2 Wadia Institute of Himalayan Geology, G. M. S. Road, Dehradun 284 001, IN
Source
Current Science, Vol 121, No 4 (2021), Pagination: 560-566Abstract
Kedarnath temple is situated on the Garhwal Himalayan range near River Mandakini in Rudraprayag, Uttarakhand, India. The temple (more than 1200 years old) was badly affected by devastating floods and landslides during 13–16 June 2013. To protect the aesthetic value of this ancient temple, a systematic scientific conservation has been carried out. The present study describes the geochemical character of the rocks mounted on the temple. It also evaluates weathering trend of the rocks by studying petrography and the analysis of major oxides, using optical microscopy, X-ray fluorescence and X-ray diffraction. Petrography and discrimination clusters analysis show that the rock is granitic gneisses in composition and is peraluminous in nature, while the new rock KDN2 sample shows paralkaline character.Keywords
Ancient temple, conservation, exterior surface, geochemistry, petrography.Full Text
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