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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/6254
Title: Genetic aspects of gold mineralization in the Southern Granulite Terrain, India
Authors: Sahoo A.K.
Krishnamurthi R.
Vadlamani R.
Pruseth K.L.
Narayanan M.
Varghese S.
Pradeepkumar T.
Published in: Ore Geology Reviews
Abstract: Gold mineralization in Southern Granulite Terrain (SGT) of India has close spatial relationship with the shear zones (Moyar-Bhavani) present in Cauvery Suture Zone. Gold is found to be associated with primary quartz veins, placers and laterites. The gold prospects in SGT can be broadly grouped into three provinces i) Wynad-Nilgiri, ii) Malappuram and iii) Attappadi. The auriferous quartz veins are within the deformed biotite/hornblende bearing gneisses and amphibolite. Wall rock alteration is conspicuous around the mineralized veins and gives an assemblage of muscovite-calcite-ankerite-chlorite-biotite-pyrite related to fluid-rock interaction at the time of vein formation. Fluid inclusion studies of vein quartz gives an idea of the nature of the ore forming fluids, the fluid involved in gold mineralization is of low saline and aqueous-carbonic in composition and quite similar to the orogenic lode gold deposits reported world-wide. Micro-thermometric data indicates fluid immiscibility (phase separation) during trapping of fluid inclusions and this must have played an important role in gold deposition. Geochronological studies of mineral separates from Wynad-Nilgiri province using Rb-Sr and Sm-Nd isochron methods of the auriferous quartz veins gave an age of approximately 450. Ma for the vein formation. The present studies on SGT gold mineralization indicate 1. During the Pan-African orogeny, extensive fluid influx from mantle and metamorphism extracted gold from a mafic source and were focused along major structural discontinuities of Moyar-Bhavani Shear Zone, 2. The aqueous-carbonic ore fluid interacted with rocks of the upper crust and triggered a set of metasomatic changes responsible for the dissolved components such as Ca, Si and Fe and finally precipitating in the veins and 3. The mineralizing fluid with dissolved gold in sulphide complex got destabilized due to fluid immiscibility and wall rock alteration leading to the deposition of gold with associated sulphide minerals in the vein system. © 2015 Elsevier B.V.
Citation: Ore Geology Reviews (2016), 72(): 1243-1262
URI: https://doi.org/10.1016/j.oregeorev.2015.07.019
http://repository.iitr.ac.in/handle/123456789/6254
Issue Date: 2016
Publisher: Elsevier
Keywords: Auriferous quartz veins
Gold mineralization
Ore forming fluid
Pan-African orogeny
Southern Granulite Terrain
ISSN: 1691368
Author Scopus IDs: 56765413800
6602173081
55266167100
6602967190
56765430400
56227442400
56766111400
Author Affiliations: Sahoo, A.K., Department of Earth Sciences, Indian Institute of Technology, Roorkee, 247667, India
Krishnamurthi, R., Department of Earth Sciences, Indian Institute of Technology, Roorkee, 247667, India
Vadlamani, R., Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur, 721302, India
Pruseth, K.L., Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur, 721302, India
Narayanan, M., Department of Earth Sciences, Indian Institute of Technology, Roorkee, 247667, India
Varghese, S., Geological Survey of India, DK Block, GSI Complex, Karunamoyee, Salt Lake, Kolkata, 700091, India
Pradeepkumar, T., PPOD Laboratory, Geological Survey of India, Bangalore, 560070, India
Funding Details: This study was funded by the Ministry of Science and Technology , Government of India through a research project ( SR/S4/ES-430/2009 ) to work on gold mineralization in the Southern Granulite Terrain of India. We sincerely thank the Department of Earth Sciences, IIT Roorkee, India for providing all the facilities to carry out this work. The authors thank Dr. M. Santosh for inviting us to write a paper in a special volume on Metallogeny in India in Ore Geology Reviews.
Corresponding Author: Krishnamurthi, R.; Department of Earth Sciences, Indian Institute of TechnologyIndia; email: krishnamurthi.iitr@gmail.com
Appears in Collections:Journal Publications [ES]

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