Gold, platinum and palladium enrichments in arcs: role of mantle wedge, arc crust and halogen-rich slab fluids

被引：7

作者：

Kepezhinskas, Pavel ^{[1
]}

Kepezhinskas, Nikita ^{[2
]}

Berdnikov, Nikolai ^{[3
]}

机构：

[1] PNK GeoSci, Tampa, FL 33609 USA

[2] Univ Florida, Dept Geol Sci, Gainesville, FL USA

[3] Inst Tecton & Geophys, Khabarovsk, Russia

来源：

16TH INTERNATIONAL SYMPOSIUM ON WATER-ROCK INTERACTION (WRI-16) AND 13TH INTERNATIONAL SYMPOSIUM ON APPLIED ISOTOPE GEOCHEMISTRY (1ST IAGC INTERNATIONAL CONFERENCE) | 2019年 / 98卷

关键词：

CONVERGENT; CHLORINE; GLASSES; SULFUR; ZONE; AU;

D O I：

10.1051/e3sconf/20199808010

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Arc-related magmas are frequently enriched in Au, Pt and Pd in respect to MORB and OIB igneous suites. Magmatic arcs commonly host large-scale hydrothermal Au and Au-Cu and PGE mineralization related to young volcanic systems and zoned ultramafic complexes respectively. Island-arc mantle xenoliths show Au, Pt, Pd enrichments related to mantle wedge metasomatism by slab-derived fluids. Long-lived plumbing systems in arc crust (arc magma chambers) show further enhancement of Au, Pt and Pd enrichments through subduction-related metamorphic and metasomatic processes in the presence of halogen-rich, aqueous fluids. We propose that Au-Pt-Pd enrichments in arcs are caused by mantle wedge-slab interactions followed by differentiation and metamorphism of magmatic conduits in arc crust.

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页数：5