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Gold-rich VHMS deposits of the Western Cordillera of Ecuador: mineralogy, lead isotope and metal geochemistry

Published inVMS deposits of Latin America, Editors Shelock, R. and Logan M.A.V., p. 333-339
PublisherGeological Association of Canada
Collection
  • Special Publication; 2
Publication date2000
Abstract

The Western Cordillera of Ecuador hosts three Au-rich Cu-Zn YHMS deposits within an EarlyTertiary island arc sequence, now accreted to the continent. The deposits are characterized by pyrite-chalcopyrite mineral parageneses including bornite, covellite, digenite, tennantite, and are affected bya quartz-sericite alteration. Lead isotope compositions are homogeneous within each deposit but differsignificantly among the three orebodies, even if two of them are only l.5 km apart. Lead isotopecompositions of the orebodies overlap those of the volcanic host rocks and are consistent with leadderived from mixing of pelagic sediments, mantle and oceanic crust. Geological setting mineralogy,and gold grades of the VHMS depos its of the Western Cordillera of Ecuador bear some similarities to those of recent and present-day massive sulphides of the western Pacific.those of recent and present-day massive sulphides of the western Pacific.

Citation (ISO format)
CHIARADIA, Massimo, FONTBOTÉ, Lluís. Gold-rich VHMS deposits of the Western Cordillera of Ecuador: mineralogy, lead isotope and metal geochemistry. In: VMS deposits of Latin America. [s.l.] : Geological Association of Canada, 2000. p. 333–339. (Special Publication)
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Book chapter (Published version)
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  • PID : unige:29441
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