| 新疆额尔齐斯金矿带构造控矿规律研究 |
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| 引用本文：.2007.Structural ore-control regularities of Ertix gold belt in north Xinjiang[J].Mineral Deposits,26(1):33~42 |
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| 基金项目:中国科学院创新工程项目(KZC3-SW-137)和国家科技攻关“305”项目（2003BA612A-06-19和2001BA609A-07-08） |
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| 中文摘要:额尔齐斯金矿带位于新疆阿尔泰南缘。地质研究表明，发生于晚石炭世—早二叠世的金成矿作用在整个额尔齐斯金矿带中广泛发育，明显受额尔齐斯韧性剪切带及其次级断裂的控制。通过对额尔齐斯构造带及其中发育的21个金矿床(点)尤其是多拉纳萨依、托库孜巴依、萨尔布拉克、科克萨依和马热勒铁等金矿床控矿构造的研究，作者提出如下新认识：额尔齐斯韧性剪切带总体上具有向东收敛、向西散开的基本形式，控矿构造具有向东单一（仅为韧性剪切构造）、向西复杂（脆韧性构造叠加于韧性构造和中酸性岩体上）的特点，由此控制的金成矿作用具有“东浅西深、东弱西强”等6条基本规律。在此基础上，结合EH4深部地球物理测量结果，指出额尔齐斯金矿带西部哈巴河地区和中部富蕴地区是形成大型金矿床的有利地区。 |
| 中文关键词:地质学 金成矿作用 EH4电导率成像 韧性剪切带 额尔齐斯金矿带 新疆 |
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| Structural ore-control regularities of Ertix gold belt in north Xinjiang |
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| Abstract:The Ertix gold belt lies in the Ertix ductile shear zone on the southern margin of the Altay area in northern Xinjiang. Geological researches indicate that gold mineralization was well developed along the whole Ertix gold belt in the period from Late Carboniferous to Early Permian, obviously controlled by the Ertix ductile shear zone and the secondary fault system. Based on detailed geological and structural studies of the Ertix ductile shear zone and 21 typical gold deposits, especially the Duolanasayi, Tuokuzibayi, Sarbulake, Kekesayi and Mareletie gold deposits, the authors have reached some new conclusions:① the Ertix ductile shear zone is broadly tapered, becoming narrower to the east, i.e., divergent to the west and convergent to the east; ② ore_control structures and gold mineralization are complex in the western and central parts of the Ertix ductile shear zone, i.e., ore_control structures are late brittle_ductile shearing superimposed on the early ductile shear zone and the original intrusive structures of granites. Mineralization types are quartz veins and disseminated altered rocks. In contrast, the eastern end of the belt is structurally simple, with mineralization being of the mylonitization type; ③ the gold mineralization controlled by the faults becomes shallower and weaker in the east and deeper and stronger in the west along the Ertix gold belt. The authors used the Stratagem EH4 electrical conductivity image system in the Duolanasayi, Tuokuzibayi, Sarbulake and Zhakete gold deposits to verify the results of the geological study and detect the underground details of the ore_controlling structures. Large and deep low_resistivity anomalies were found in the Duolanasayi and Tuokuzibayi gold deposits at the western end of the belt, whereas the Zhakete gold deposit at the eastern end of the belt only has small and sallow low_resistivity anomalies. The results imply that the ore_controlling structures and/or ore bodies in gold deposits at the western end of the belt extend for a considerable distance in the dip direction. Based on the results of detailed geological studies combined with the measurement results of the EH4 electrical conductivity image system, it is held that the western and central parts of the Ertix gold belt are most promising potential targets for finding large_scale gold deposits related to the ductile shear zone. |
| keywords:geology, gold mineralization, EH4 conducting image, ductile shear zone, Ertix gold belt, Xinjiang |
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