THE SOURCE OF ORE FLUIDS AND SOLUTES IN ARCHEAN LODE-GOLD DEPOSITS OF WESTERN-AUSTRALIA

被引：45

作者：

HO, SE

GROVES, DI

MCNAUGHTON, NJ

MIKUCKI, EJ

机构：

[1] Key Centre for Strategic Mineral Deposits, Department of Geology, The University of Western Australia, Nedlands

来源：

JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH | 1992年 / 50卷 / 1-2期

关键词：

D O I：

10.1016/0377-0273(92)90044-E

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The ore fluids which produced Archaean lode-gold deposits in sub-amphibolite facies rocks of the Yilgarn Block, Western Australia, are characteristically low- to moderate-salinity H2O-CO2-CH4 fluids. Wall-rock alteration and ore deposition were from a generally reducing, near-neutral fluid at 200-350-degrees-C and 1-3 kbar, although more oxidising fluids produced some assemblages in the giant Golden Mile deposit. Gold was transported as reduced-sulphur complexes. The ore fluid composition and stable and radiogenic isotope data indicate multiple sources for the fluid and solute. Deep plumbing systems are invoked, with the fluids being either metamorphic fluids that derived solutes from the lower and upper crusts, or fluids exsolved from deep-seated granitoids formed by anatexis of such crust.

引用

页码：173 / 196

页数：24

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