西秦岭构造格局及找矿方向

Tectonic Framework and Prospecting Direction of Western Qinling

本文着重从古缝合带入手,结合地层、变质相、岩浆岩及矿产分布特征,将西秦岭划分为北秦岭加里东褶皱带、中秦岭海西褶皱带、南秦岭印支褶皱带(又分为碌曲-成县逆冲推覆构造带、迭部-武都逆冲推覆构造带、玛曲-文县逆冲推覆构造带)及碧口地体等构造单元。该区几经秦岭造山带活动的影响和相邻褶皱系的干扰,形成七个成矿区,各区有着不同的地层结构,不同的构造特征,经受了多次不同的地质作用,从而也有着各自特殊的成矿专属性;就成矿而言各大断裂的低序次配套构造,往往是容矿场所,而印支期岩体的边部,成矿几率则更高。

In this paper, we started from the deep faults and combined with stratigraphic , metamorphic facies, magmatic rock and distribution characteristics of mineral resources. The western Qinling was divided into northern Qinling Caledonian foldbelt, central Qinling Hercynian foldbelt , southern Qinling indo-china foldbelt（it also could divided into Luqu-Chengx- ian overthrusting structural belt, Diebu-Wudu overthrusting structural belt and Maqu-Wenxian overthrusting structural belt） , and Bikou terrene tectonics. This area affected by Qinling orogenic belt activity and adjacent fold system for several times. It formed seven metallogenetic exclusive zones in this area. Each zone had different stratum structure, different structural characteristics, and undergone a number of different geological processes. Thus, they also had their own metallogenetic specialization. As far as mineralization was concerned, every major fault＇s subordinate structure always was holding ore place. And at the margin of indo-china rock , the probability of mineralization was hi^er.