Why large porphyry Cu deposits like high Sr/Y magmas?

Abstract:

:Porphyry systems supply most copper and significant gold to our economy. Recent studies indicate that they are frequently associated with high Sr/Y magmatic rocks, but the meaning of this association remains elusive. Understanding the association between high Sr/Y magmatic rocks and porphyry-type deposits is essential to develop genetic models that can be used for exploration purposes. Here we present results on a Pleistocene volcano of Ecuador that highlight the behaviour of copper in magmas with variable (but generally high) Sr/Y values. We provide indirect evidence for Cu partitioning into a fluid phase exsolved at depths of ~15 km from high Sr/Y (>70) andesitic magmas before sulphide saturation. This lends support to the hypothesis that large amounts of Cu- and S-bearing fluids can be accumulated into and released from a long-lived high Sr/Y deep andesitic reservoir to a shallower magmatic-hydrothermal system with the potential of generating large porphyry-type deposits.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Chiaradia M,Ulianov A,Kouzmanov K,Beate B

doi

10.1038/srep00685

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

685

issn

2045-2322

journal_volume

2

pub_type

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