新疆塔里木盆地柯坪断隆构造演化与铀成矿特征

Tectonic Evolution and Uranium Metallogenic Characteristics of Keping Uplift in Tarim Basin,Xinjiang

以位于新疆塔里木盆地西北缘的柯坪断隆为例,分析了其构造演化特征,并对其内的英岗矿点、雅尔巴克矿点、柯坪矿点等典型铀矿点的矿化特征进行了讨论,在此基础上,详细研究了各矿点内构造演化与铀成矿的关系。研究表明:(1)柯坪断隆内断裂和断层较发育,以走滑或斜冲构造和逆冲推覆构造两种格局演化,该类复杂的构造样式实质上是印度板块与欧亚板块远程碰撞造山造成天山山体向外扩展的一种表现;(2)柯坪断隆铀矿成因类型主要有层间氧化带型(英岗矿点)、后生热液蚀变叠加型(柯坪矿点)、同生沉积后生(热液)富集型、碳硅泥岩型(雅尔巴克矿点)等。上述分析对于在塔里木盆地内进一步开展铀矿找矿勘查工作有一定的借鉴价值。

Taking the Keping Uplift located in the northeast of Tarim Basin in Xinjiang as the study example,the tectonic evolution characteristics of Keping Uplift is analyzed,and the mineralization characteristics of the typical uranium mineral points（ Yinggang mineral point,Yaerbake mineral point and Keping mineral point） are discussed in detail,besides that,the relationship between tectonic evolution and uranium metallogenic of the above three mineral points are studied. The results show that：（1）the fractures and faults in Keping Uplift are well developed,the tectonic evolution of Keping Uplift is characterized by strike-slip or oblique-thrust tectonic and thrust nappe tectonic,the composite tectonic style is an expression form of expansion outward of Tianshan Mountain caused by the remote collision orogenic movement in essence;（2）the genesis types of uranium in Keping Uplift are mainly for interlayer oxidation zone type（ Yinggang mineral point）,superposition of epigenetic hydrothermal alteration type（ Keping mineral point）,syngenetic sedimentary epigenetic（ hydrothermal） enrichment type and silicon carbon mudstone type（ Yaerbake mineral point）. The above discussion results related to the tectonic evolution and uranium metallogenic characteristics of Keping Uplift in Traim Basin,Xinjiang can provide some reference for conduction prospecting and exploration of uranium deposits in Tarim Basin.