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The Productora Cu-Au-Mo Deposit, Chile

Citation

Escolme, A and Halley, S and Potma, W, The Productora Cu-Au-Mo Deposit, Chile, Proceedings of the SGA Biennial Meeting, 24-27 August 2015, Nancy, France, pp. 287-290. (2015) [Refereed Conference Paper]


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Abstract

Productora, located in the coastal range of Region III, northern Chile, is a magmatic-hydrothermal, tourmaline breccia hosted, structurally controlled, Mesozoic Cu-Au-Mo deposit. It is hosted by a thick sequence of Jurassic rhyodacite volcanics which have been intruded by two stocks; the Cachiyuyito tonalite and Ruta-5 granodiorite, and by several phases of basaltandesite dykes. There are two major fault orientations; north trending and northwest trending sets, which control the mineralised breccias and locally upgrade mineralisation respectively. Alteration is widespread, complex and pervasive. Hypogene alteration assemblages transition from distal magnetite-amphibole, to sodic-calcic, to sodic, to phyllic, to proximal potassic. Lower temperature advanced argillic assemblages are juxtaposed next to proximal high-temperature assemblages indicating significant vertical offset on local faults. There is strong evidence for magmatic hydrothermal processes but the subordinate iron-oxide content and lack of an intimately associated igneous intrusion mean the deposit does not easily fall into the IOCG or porphyry deposit class. Overall, current data suggests that the deposit is more compatible with the porphyry model. The mineralisation and potassic alteration zonation may be attributed to cooling hydrothermal fluids, and the halo of sodic and magnetite alteration attributed to heating of regional brines.

Item Details

Item Type:Refereed Conference Paper
Keywords:IOCG, porphyry, Cu, Au, Mo
Research Division:Earth Sciences
Research Group:Geology
Research Field:Ore Deposit Petrology
Objective Division:Mineral Resources (excl. Energy Resources)
Objective Group:Mineral Exploration
Objective Field:Mineral Exploration not elsewhere classified
Author:Escolme, A (Dr Angela Escolme)
ID Code:116418
Year Published:2015
Deposited By:CODES ARC
Deposited On:2017-05-09
Last Modified:2017-10-30
Downloads:3 View Download Statistics

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