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首页> 外文期刊>Economic geology and the bulletin of the Society of Economic Geologists >The Distribution of PGE and the Role of Arsenic as a Collector of PGE in the Spotted Quoll Nickel Ore Deposit in the Forrestania Greenstone Belt, Western Australia
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The Distribution of PGE and the Role of Arsenic as a Collector of PGE in the Spotted Quoll Nickel Ore Deposit in the Forrestania Greenstone Belt, Western Australia

机译：西澳大利亚Forrestania绿岩带斑状古镍矿中PGE的分布和砷作为PGE捕收剂的作用

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The Spotted Quoll PGE-bearing Ni deposit in the Forrestania greenstone belt in the Archean Yilgarn block in Western Australia is a komatiite-associated massive sulfide orebody tectonically displaced from its original host. The brecciated ore contains clasts of quartz and garnet schist and is located along a shear zone overlain by banded iron formation (BIF) and underlain by BIF and quartz-biotite metasediments. The deformation of the ore has destroyed its magmatic textures and it has been sheared and reciystallized at amphibolite facies. Then the deformed ore has been subjected to a hydrothermal event that concentrated the PGE with Au and As, often at the edge of the Ni ore. The PGE are distributed between PGM and in solid solution in Ni sulfarsenides, and Pd also occurs in pentlandite. The PGM include sudburyite (PdSb), sperrylite (PtAs_2), and irarsite (IrAsS). All six PGE and minor Au are hosted in gersdorffite (NiAsS). Two generations of gersdorffite have been recognized. A higher temperature magmatic euhedral Co-rich gersdorffite encloses Ir-, Pt- and Rh-bearing PGM surrounded by halos of Rh-, Ir-, and Os-rich gersdorffite. A lower temperature Ni-rich gersdorffite forms anhe-dral grains and rims on grains of nickeline (NiAs). In this low-temperature gersdorffite PGE are concentrated toward the mineral edges. Sudburyite and gold occur associated predominantly with nickeline. The PGE and gold are now predominantly associated with sulfarsenides that are the controlling factor for their distribution.
机译：西澳大利亚州阿尔凯恩·伊尔加尔岩块的Forrestania绿岩带中斑状含PGE的镍矿床是与科马铁矿伴生的块状硫化矿矿体，构造矿性地从其原始宿主中移出。角砾状的矿石含有大量的石英和石榴石片岩，并位于剪切带上，该剪切带上覆盖着带状铁形成（BIF），而下端则覆盖有BIF和石英黑云母变质沉积物。矿石的变形破坏了它的岩浆结构，并且在角闪岩相上被剪切和胶凝。然后，变形后的矿石经历了一次热液事件，使PGE中的Au和As集中在Ni矿石的边缘。 PGE分布在PGM之间和固溶在亚硫砷化镍中，Pd也存在于五氧化铁中。 PGM包括苏德伯利岩（PdSb），锂闪石（PtAs_2）和Irarsite（IrAsS）。所有六个PGE和次要Au都存放在gersdorffite（NiAsS）中。已经认识到两代gersdorffite。富含岩浆的富含共价Cos的锗矿辉石包围着含Ir，Pt和Rh的PGM，并被富含Rh，Ir和Os的锗辉石包围。较低温度的富Ni的锗辉石会在镍（NiAs）的晶粒上形成无心形晶粒和边缘。在这种低温下，磷钙铁矿PGE朝着矿物边缘集中。钠铁矿和金主要与镍有关。现在，PGE和金主要与作为其分布控制因素的亚砷化物有关。

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