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Minerals 2017, 7(10), 192; https://doi.org/10.3390/min7100192

Constraints on Conceptual and Quantitative Modeling of Early Diagenetic Sediment-Hosted Stratiform Copper Mineralization

École Polytechnique de Montréal, Montreal, QC H3C 3A7, Canada
Current address: 13250 rue Acadie, Pierrefonds, QC H9A 1K9, Canada.
Received: 8 August 2017 / Revised: 5 October 2017 / Accepted: 5 October 2017 / Published: 13 October 2017
(This article belongs to the Special Issue Geochemistry and Mineralogy of Hydrothermal Metallic Mineral Deposits)
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Abstract

Early diagenetic sediment-hosted stratiform copper (eSSC) mineralization results from low-temperature cuprous chloride complexes carried by saline aqueous solution circulating through footwall aquifers. Favorable copper solubilities are attained in moderately oxidizing, near-neutral pH solutions. That specific oxidation level is not determined by co-existence with hematite, with its near-indiscriminant control over Eh. Instead, redbed footwall aquifers are signatures of diagenetic oxidation. Relentless in-situ oxidation of ferrous minerals in redbeds produces pore waters too reduced to transport copper, thus eliminating compaction waters as ore solutions. Continuous early influxes of descending oxygen-rich meteoric waters which have assimilated evaporitic salts may redden aquifers and still retain oxidation levels capable of carrying copper to form downstream eSSCs. View Full-Text
Keywords: early diagenetic sediment-hosted stratiform copper (eSSC); genetic modeling; compaction-driven; topography-driven; meteoric water; oxidation (Eh)-pH controls early diagenetic sediment-hosted stratiform copper (eSSC); genetic modeling; compaction-driven; topography-driven; meteoric water; oxidation (Eh)-pH controls
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Brown, A.C. Constraints on Conceptual and Quantitative Modeling of Early Diagenetic Sediment-Hosted Stratiform Copper Mineralization. Minerals 2017, 7, 192.

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