中条铜矿与秦岭造山带

中条裂谷位于华北陆(板)块南缘的北部,中条群处在活动大陆边缘海域的沉积环境,应包括在秦岭-大别活动带内.从中条裂谷的地质特征分析,如NNE-EW向构造格架、火成岩省、古地热状态及成矿作用等,均与秦岭造山带碰撞作用息息相关.对华北陆(板)块南缘,南、北秦岭造山带,扬子陆(板)块北缘4个构造单元的地壳和上地幔元素丰度比较,可知扬子陆(板)块以富含Cu为特征.由于古元古代以前,扬子陆(板)块已俯冲到华北陆(板)块之下,同时古热幔柱脉动式活动频繁,为成矿作用提供了矿质来源,在中条裂谷的深部形成含铜(金)的成矿物质场,又有基性和酸性岩浆的喷发和侵入,以及具中低温、压的古地热构造环境,为创建释放热流场和成矿动力场奠定了控矿基础.

Coper deposits of the Zhongtiao rift and Qinling orogenic belt

Zhongtiao rift belt is situated to the North of the southern margin of the North China plate.The Zhongtiao Group is deposited in a marine area at the southern side of an active continental margin.This area is considered as part of the Qinling-Dabie orogen.Geological features,such as NNE to EW trending structural framework,igneous province,palaeogeothermics gradient and metallogenesis suggest consistently a close relation of the Zhongtiao belt to the Qinling orogen.Comparison in elements abundance of the crust and upper mantle among the southern margin of the North China plate,North Qiniling orogenic belt and the northern margin of the Yangtze plate indicates that the Yangtze plate is characterized with high copper contents.The subduction of the Yangtze plate beneath the North China plate in the Paleoproterozoic Era and frequent pulsation of the hot paleo-mantle plume makes ore-forming materials available,resulting in a copper and gold-enriched zone in the deep part of the Zhongtiao rift belt.Eruption and intrusion of the basic and acidic magmas,the moderate-low temperature and pressure geophysical environment provided favorable geothermal and dynamic environments for ore formation of this rift belt.