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
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