Tectonic Ore-controlling Characteristics and Prospecting Direction of the Caishigou Deposit in South-Middle Altyn
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摘要: 阿尔金南中段采石沟矿区位于阿尔金左行走滑断裂带中段南侧，属于阿卡腾能山造山带阿克提早古生代裂陷槽，北侧为阿克提-红水沟断裂，南侧为阿尔金南缘断裂，其间广泛分布有奥陶纪滩涧山群火山岩，为初始矿源层；区内北北东向张性断层及近东西向断层发育，均为控矿断层。根据走滑应力场中构造分布特征及控矿规律理论，该区北东向、近东西向构造为控矿构造，而采石沟金矿均受控于北东向及近东西向两组构造中，与理论完全一致。为了扩大该区地质找矿成果，根据上述结果，结合区内地球化学勘查成果划分了阿克提、柴水沟、采石沟、清水沟、红水沟找矿靶区，经初步检查验证，多数靶区内均发现矿点，进一步证实了靶区选择的合理，为以后在该区找矿提供了找矿方向。Abstract: The Caishigou deposit is located in the southern side of the middle part of Altynleft-lateral strike-slip fault zone, which serves as a part of early Paleozoic Aketiaulacogen during the formation of the Akatengneng orogenic belt. It's bounded by the Aketi-Hongshuigou fault to the north and the southern Altyn fault to the south.The volcanic rocks of Ordovician TanjianshanGroup are widely distributed in this area, which is the preliminary source bed of this deposit.The NNE-extending extensional faults and nearly WE-extending faults were developed in this area, which control the development of the ore-bodies.According to the structural distribution characteristics in the strike-slip stress field and the theory of the ore-controlling law, the NE-trending and nearly EW-extending tectonics serve as the main ore-controlling structures in this deposit, the structure features and distribution of the Caishigou deposit is consistent with the theory based on the observation.In order to expand the geological prospecting achievement, the Aketi, Chaishuigou, Caishigou, Qingshuigou and Hongshuigou prospecting target zones have been defined in this area according to the studied results mentioned above and the geochemical survey achievements. The preliminary explorating results show that some occurrences have been found in most of these target zones. These results further confirmthe rationality of target zone-divination, which provide the prospecting direction in the future.
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