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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/35938

Title: Mineral features of Cu-Ag-Ba-Mn mineralisations of La Serena, Chile
Authors: Carrillo-Rosúa, Javier
Morales-Ruano, Salvador
Morata, Diego
Issue Date: Aug-2003
Abstract: Three kinds of mineralisation appear in Lower Cretaceous volcanic units in the la Serena area, which have undergone very low metamorphism (prenhite+pumpellyite, with albite, epidote and chlorite): a) Stratiform Mn mineralisation enclosed in sandstones interlayered with andesites. The ore mineralogy consists mainly of silicates composed of braunite, piemontite and minor pyrolusite. b) Stratabound Cu-(Ag) mineralisations (“Mantos tipo Chile”), associated with lappilli tuffs with bitumen. The major phases are bornite and chalcopyrite, with minor fahlore, sphalerite, galena, stromeyerite, cobaltite and hematite. Besides stroomeyerite (AgCuS), there is Ag in minor quantities of Cu-bearing minerals, especially bornite (up to 0,33% at. Ag). c) Ba-Ag mineralisation in veins crosscutting volcanic rocks. The ore mineralogy consists of silver-bearing minerals (native Ag±Hg (87,4 - 93,4% at. Ag and 5,6 – 10,0 % at. Hg), Ag chloride (bromide), acanthite, and Ag-Cu sulphide (Ag0,77-2,69Cu0,90-1,44S1)), and copper-bearing minerals (bornite, Cu sulphide, and fahlore). The systematic spatial relationship among the different kinds of mineralisations, the basic magmatism, the very low-grade metamorphism, and the intrusion of granitic bodies suggest a genetic link among the different phenomena
Sponsorship: Universidad de Granada. Departamento de Mineralogía y Petrología
Grupo de Investigación de la Junta de Andalucía RNM-0131
Instituto Andaluz de Ciencias de la Tierra (CSIC-UGR)
Universidad de Chile. Departamento de Geología
The research has been supported by the CSIC- University of Chile cooperation project 2001-CL-00015 and CSIC/2001/02-08, the project BTE-2001-3308 of the DGI of Ministerio de Ciencia y Tecnología, the RNM 0131 Research Group of Junta de Andalucía, the “Plan Propio” of Granada University and the I001-99/2 DID project of the University of Chile.
Publisher: Millpress
Keywords: Silver
CMT deposits
Depósitos de tipo manto
Coastal range
Cordillera de la Costa
URI: http://hdl.handle.net/10481/35938
ISBN: 9077017771
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Carrillo-Rosúa, J.; Morales-Ruano, S.; Morata Céspedes, D. Mineral features of Cu-Ag-Ba-Mn mineralisations of La Serena, Chile. In: Eliopoulos, D.G. et al., (eds.), Mineral exploration and sustainable development: proceedings of the Seventh Biennial SGA Meeting, Athens (Greece), 24-28 August 2003. Rotterdam: Millpress, 2003. pp. 953-956. [http://hdl.handle.net/10481/35938]
Appears in Collections:DDCE - Capítulos de Libros

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