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Release of gold-bearing fluids in convergent margin magmas prompted by magnetite crystallization
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Release of gold-bearing fluids in convergent margin magmas prompted by magnetite crystallization
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Journal Article
Release of gold-bearing fluids in convergent margin magmas prompted by magnetite crystallization
2004
Overview
A relationship between convergent margin magmas and copper–gold ore mineralization has long been recognized
1
,
2
,
3
,
4
,
5
,
6
. The nature of the genetic link is controversial, particularly whether the link is due to high-oxygen-fugacity (
f
O
2
) melts and fluids released from subducted slabs
5
,
6
,
7
or to brine exsolution during magmatic evolution
4
. For submarine, subduction-related volcanic glasses from the eastern Manus basin, Papua New Guinea, we here report abrupt decreases in gold and copper abundances, coupled with a switch in the behaviour of titanium and iron from concentration increases to decreases as SiO
2
rises. We propose that the abrupt depletion in gold and copper results from concurrent sulphur reduction as a result of
f
O
2
buffering, causing enhanced formation of copper–gold hydrosulphide complexes that become scavenged from crystallizing melts into cogenetic magmatic aqueous fluids. This process is particularly efficient in oxidized arc magmas with substantial sulphate. We infer that subsequent migration and cooling of exsolved aqueous fluids create links between copper–gold mineralization and arc magmatism in the Manus basin
8
,
9
, and at convergent margins in general
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,
2
,
3
,
4
,
5
,
6
.
Publisher
Nature Publishing Group UK,Nature Publishing,Nature Publishing Group
