Platinum group mineral (PGM) and Fe-Ni-As-S minerals in the Sartohay chromitite, Xinjiang (NW China): Implications for the mobility of Os, Ir, Sb, and As during hydrothermal processes
Platinum group mineral (PGM) and Fe-Ni-As-S minerals in the Sartohay chromitite, Xinjiang (NW China): Implications for the mobility of Os, Ir, Sb, and As during hydrothermal processes
复制标题
新疆（中国西北部）Sartohay 铬铁矿中的铂族矿物 (PGM) 和 Fe-Ni-As-S 矿物：对热液过程中 Os、Ir、Sb 和 As 迁移率的影响
DOI：
10.1016/j.oregeorev.2015.08.001
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发表时间：
2016
影响因子：
3.3
通讯作者：
Qiu Tian
中科院分区：
文献类型：
--
作者：
Zhu Yongfeng;Tan Juanjuan;Qiu Tian
萨托海铬铁矿存款产于中国西北地区新疆西准格尔的萨托海蛇绿岩混杂岩中，含有irarsite、布雷索普特石和Fe-Ni-As-S矿物。岩相学观察表明，在较低的Fe ~（3+）/Fe ~（2+）比值（0.14-0.34）下，铬尖晶石首先在低温下蚀变为富铁铬铁矿，然后在相对氧化的环境下蚀变为磁铁矿。之后，在热液作用下形成了铁砷铁矿、钡硫铁矿和Fe-Ni-As-S矿物。从磁铁矿-镍黄铁矿、镍黄铁矿-针铁矿-红柱石、菱镁矿-硫铁矿到菱镁矿-硫铁矿-硫铁矿的系统变化表明了P-T-fS 2-fO 2空间复杂的演化路径。Os、Ir、Sb和As在浸染状铁砷石、硫锑铅矿和Fe-Ni-As-S矿物中的富集反映了Os、Ir、Sb和As在低温热液过程中的活动性，并在Sartohay蛇绿混杂岩中覆盖了铬铁矿。
The Sartohay chromitite deposit, hosted in the Sartohay ophiolite mélange in western Junggar (Xinjiang province, NW China), contains irarsite, breithauptite, and Fe–Ni–As–S minerals. Petrographic observations indicate that the chrome-spinel was firstly altered to Fe-rich chromite at low-temperature with relatively lower Fe3 +/Fe2 +ratios (0.14–0.34), and such Fe-rich chromite was altered to magnetite in a relatively oxidizing environment. Afterwards, irarsite, breithauptite, and Fe–Ni–As–S minerals formed during hydrothermal processes. A systematic change from magnetite–pentlandite, pentlandite–heazlewoodite–maucherite, millerite–breithauptite, to millerite–godlevskite–irarsite-dominated assemblage in the Sartohay chromitites suggests a complex evolutionary path in the P–T–fS2–fO2space. Enrichments of Os, Ir, Sb, and As in disseminated irarsite, breithauptite, and Fe–Ni–As–S minerals reflect the mobility of Os, Ir, Sb, and As during low-temperature hydrothermal processes overprinting the chromitites in the Sartohay ophiolitic mélange.