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

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Published in Shelock, R. and Logan M.A.V. VMS Deposits of Latin America: Geological Association of Canada. 2000, p. 333-339
Collection Special Publication; 2
Abstract The Western Cordillera of Ecuador hosts three Au-rich Cu-Zn YHMS deposits within an Early Tertiary 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 by a quartz-sericite alteration. Lead isotope compositions are homogeneous within each deposit but differ significantly among the three orebodies, even if two of them are only l.5 km apart. Lead isotope compositions of the orebodies overlap those of the volcanic host rocks and are consistent with lead derived 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.
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Structures
Research groups Isotope Geochemistry, Geochronology and Thermochronology
Mineral Resources and Geofluids
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CHIARADIA, Massimo, FONTBOTÉ, Lluis. Gold-rich VHMS deposits of the Western Cordillera of Ecuador: mineralogy, lead isotope and metal geochemistry. In: Shelock, R. and Logan M.A.V. (Ed.). VMS deposits of Latin America. [s.l.] : Geological Association of Canada, 2000. p. 333-339. (Special Publication; 2) https://archive-ouverte.unige.ch/unige:29441

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Deposited on : 2013-08-26

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