Nickel tenor variations between Archaean komatiite-associated nickel sulphide deposits, Kambalda ore field, Western Australia: the metamorphic modification model revisited

被引:0
|
作者
W. E. Stone
M. Heydari
Z. Seat
机构
[1] Centre for Global Metallogeny,
[2] School of Earth and Geographical Sciences,undefined
[3] University of Western Australia,undefined
来源
Mineralogy and Petrology | 2004年 / 82卷
关键词
Magnetite; Pyrite; Orogenic Gold Deposit; Relative Depletion; Tenor Variation;
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摘要
Geochemical data for 870 ore samples of 14 nickel sulphide (NiS) deposits from throughout the major Archaean Kambalda ore field, Western Australia, reveal highly heterogeneous Ni tenor (wt% Ni in 100 wt% sulphide) variation that is difficult to explain solely by magmatic processes. The Ni tenor values for the deposits range from 6.2 wt% Ni (Helmut deposit) to 19.7 wt% Ni (Carnilya Hill deposit), close to the range for within single deposits (9.7–19.3 wt% Ni). Contents of Ni and platinum-group elements (PGE) broadly increase with decreasing Fe and with increasing abundance of metamorphic pyrite + magnetite ± silicates. In turn, the abundance of the metamorphic phases appears to be complexly related to structural setting, metamorphic grade, alteration type, and proximity to felsic intrusion. Chondrite-normalised multi-element plots of deposit compositions reveal relative depletions in Au, As, Bi, and Te.
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页码:295 / 316
页数:21
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