Abstract
Abstract: The shear controlled, epigenetic Cu-Au mineralization at Dhani Basri area in Dausa district of Rajasthan is hosted within silicified zones traversing Mangalwar complex of rocks, of Archaean age. The mineralisation here is distinctly associated with the hydrothermal alteration manifested in the form of phyllic, propyllic, potassic and silicification alteration domains. The field and microscopic evidences are in conformity with the geochemical variation in the parameters within the mineralized zone, in the hanging wall and footwall alteration zones. Besides using the conventional method of presentation of the alteration data, the author on an experimental basis has used Alteration Box plot (Large et al. 2001) and the Alteration Index (AI) (Ishikawa, 1969) to depict the hydrothermal alteration in the environment other than the volcanic hosted massive sulphide depositional environment, for which these ratios and diagrams have been recommended by Ishikawa (1969) and Large et al. (2001). In the present case the author has been able to demonstrate the alteration very effectively with the help of these ratios and indices and has observed that these could very well be utilized in the environments other than the one, for which these diagrams are prescribed. The different trends described by Large et al. (2001) in their alteration box plot very clearly discriminate between the hydrothermal trends and the diagenetic trends of alteration, hence even if there is slight contamination by the meteoric fluids in the environments other then the volcanic hosted massive sulphide that can be separated out in the diagram. The author in his effort has observed that using the Al can very well bring out the trends of various alteration types and CCPI (carbonate-chlorite-pyrite index) in combination with the alteration mineralogy. A case study of hydrothermal alteration at Dhani Basri copper gold mineralization has been presented here.
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