The Tianger (Bingdaban) shear zone hosted gold deposit, west Tianshan, NW China: Petrographic and geochemical characteristics
The Tianger (Bingdaban) shear zone hosted gold deposit, west Tianshan, NW China: Petrographic and geochemical characteristics
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中国西天山天二（宾达坂）剪切带金矿床：岩石学和地球化学特征
DOI：
10.1016/j.oregeorev.2006.10.006
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发表时间：
2007-09
影响因子：
3.3
通讯作者：
Zhu, Yongfeng
中科院分区：
文献类型：
--
作者：
Zeng, Yishan;Zhou, Jing;Zhu, Yongfeng
王峰-天阁-萨里达拉矿区共有20多个矿体，已探明的黄金总储量超过15吨。该区位于中国西北天山西侧东向天儿（冰达班）剪切带上。透镜状矿体沿剪切带分布，长约25 km，宽约1 km。在向剪切带整体边缘倾斜的窄剪切带变形过程中，流体流动增强和压裂作用控制了矿化带的位置和方向。裂缝和应变阴影生长中的织物通常急剧下降，与周围碎裂岩基质中的线理平行，碎裂岩基质由新的石英颗粒和少量云母组成。原生金赋存于糜棱化花岗岩或糜棱化硫化物云母石英脉中。金的品位与硫化物-石英脉的赋存状态密切相关。含金硫化物-石英脉中的黄铁矿和磁黄铁矿含有原生金包裹体。黄铁矿的球粒陨石归一化稀土元素（REE）分布模式显示出轻微的REE富集和负Eu异常。黄铁矿中金含量与Th/U、Zr/Hf和（La/Yb） n值的关系表明富金黄铁矿与贫金黄铁矿不同，从而表明矿体中的黄铁矿与围岩中的黄铁矿来源不同。糜棱岩化含金石英脉的Rb-Sr等时线显示年龄为224±14 Ma，初始87sr /86Sr比值为0.7294±0.0089 （MSWD=1.1）。该年龄与白云母（220.9 ~ 222.5 Ma）的40ar /39Ar定年一致，为天儿矿床的成矿年龄。高初始87sr /86Sr比值（0.7294）、高δ34S值（+11.2 ~ +16.5‰）、低δ 18oh2o值（1.67 ~ 3.07‰）和低δD值（- 84 ~ - 104‰）表明成矿流体与岩浆作用无关。
The Wangfeng–Tianger–Saridala ore district consists of over 20 orebodies with total proven gold reserves exceeding 15 tonnes. The district is located on the EW-striking Tianger (Bingdaban) shear zone in west Tianshan Mountains, northwest China. The lensoid orebodies are distributed along the shear zone in a region about 25 km in length and 1 km in width. Enhanced fluid flow and fracturing controlled location and orientation of mineralized zones during deformation along narrow shear bands oriented oblique to the overall shear zone margins. Fabrics in fractures and strain shadow overgrowths generally plunge steeply, parallel to the lineation in the surrounding cataclasite matrix consisting of new grains of quartz and minor amounts of micas. Native gold occurs in mylonitized granites or mylonitized sulfide–mica–quartz veins. Gold grade is closely related with the occurrence of sulfide–quartz veins. Pyrite and pyrrhotite in gold-bearing sulfide–quartz veins contain inclusions of native gold. Chondrite-normalized rare earth element (REE) distribution patterns for pyrite from the orebodies show light REE enrichments and negative Eu anomalies. Relationships between gold contents and Th/U, Zr/Hf and (La/Yb)Nvalues for pyrites imply that gold-rich pyrites are different from gold-poor pyrites, thus indicate that the pyrites in the orebodies have a different origin compared with those in wall rocks. A Rb–Sr isochron for the mylonitized Au-bearing quartz veins indicates an age of 224±14 Ma with an initial87Sr/86Sr ratio of 0.7294±0.0089 (MSWD=1.1). This age is conformed by40Ar/39Ar dating on muscovites (220.9 to 222.5 Ma), which is interpreted as the age of ore-formation in the Tianger deposit. High initial87Sr/86Sr ratios (0.7294), high δ34S values (+11.2 to +16.5‰), low δ18OH2Ovalues (1.67 to 3.07‰) and low δD values (−84 to −104‰) indicate that the ore-forming fluid was unrelated to any magmatic process.
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影响因子：
1.8
作者：
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通讯作者：
Zhu Yong
DOI：
10.1029/gd021
发表时间：
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期刊：
--
影响因子：
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