甘-新北山金窝子金矿田构造控矿解析  

An Analysis of Ore-controlling Structures in the Jinwozi Gold Orefield, Beishan Area, Gansu and Xingjiang

作　　者：陈柏林[1] 吴淦国[2] 叶得金 刘晓春[1] 

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]中国地质大学,北京100083 [3]甘肃省地质调查局酒泉地质调查队,甘肃酒泉735009

出　　处：《地球学报》2003年第4期305-310,共6页Acta Geoscientica Sinica

基　　金：原地质矿产部定向研究基金(地科定96-21)资助。

摘　　要：金窝子金矿田位于中朝-塔里木板块与哈萨克斯坦板块俯冲碰撞带南缘的甘-新北山中带,是受断裂构造控制的岩浆热液型金矿床。区域构造格局控制成矿带的分布,不同构造单元具有不同的控矿构造型式。金矿田内基本构造格局是走向NE、倾向NW的低角度逆冲断层及其伴生(派)生的同走向高角度逆冲断层、紧闭褶皱以及与其垂直的高角度横张断层组成的推覆构造体系。NE向低角度逆冲断层控制蚀变糜棱岩型金矿化(以210金矿床为代表),NNW向高角度横张断层控制石英脉型金矿化(以金窝子金矿床为代表),而NE向高角度逆冲断层和紧闭褶皱中无金矿化。NE向低角度断层不仅是重要的含矿构造,而且在成矿过程中起着控制成矿物理化学界面的作用。所以,金窝子金矿田2种不同金矿化类型是同一成矿作用在不同控矿构造动力学条件下的具体表现。The Jinwozi gold orefield, located tectonically in the Beishan middle zone on the southern edge of the collusion belt between Tarim-Sino-Korean plate and Kazakhstan plate, is of magmatic hydrothermal type controlled by fault structures. Regional structures control the distribution of gold metallogenic belts, and different structural units control different types of ore-controlling structures. The main structures in the orefield comprise the low angle thrust structural system, which includes NE-trending low angle NW-dip-ping thrust faults, associated NE-trending folds and high angle faults in the upper plate, and NW-trending high angle transverse tension faults in the hanging wall. Different structure elements control different gold mineralization types in the orefield. Low angle faults control the altered mylonite type represented by the No. 210 gold deposit, while NW-trending high angle transverse tension faults control the quartz-vein type represented by the Jinwozi gold deposit. However, no gold mineralization has been found in the NE-trending folds and the NE-trending high angle faults in the hanging wall. The low-angle fault not only serves as one of the most important ore-bearing structures but also plays an important role in controlling the geochemical interface of mineralization. Therefore, the two gold mineralization types in the orefield are different expressions of the same mineralization under different tectonic-dynamic conditions of the ore-controlling structure.

关 键 词：金窝子金矿田 构造控矿 构造动力学条件 金矿化类型 甘-新北山 

分 类 号：P541[天文地球—构造地质学] P618.51[天文地球—地质学]