东秦岭沉积建造演化与成矿

The Development of Sedimentary Buildups and Mineralization in the Eastern Qinling Mountain

在华北古大陆南缘,以控制不同构造单元的断裂为界,构造格局自北而南划分如下:古大陆边缘的基底与盖层单元(华-熊陆缘带),宽坪群构造单元,二郎坪群构造单元,北秦岭(秦岭群)构造单元和南秦岭(刘岭群)构造单元。据陆缘构造发展阶段的沉积建造和岩石组合控矿因素,划分该区沉积建造演化阶段:①前长城纪陆核活动性边缘沉积建造;②中、新元古代被动大陆边缘沉积建造;③早加里东期构造体制转换期演化阶段;④古生代活动大陆边缘沉积建造;⑤中生代陆内碰撞演化阶段。从时间与空间角度,分别研究了不同构造演化阶段的成矿问题。

According to tectonic characteristics of the study area on the southern margin of North China paleocontinent, the geotec-tonic framework of the area could be divided into five units:(1)the Huashan-Xong'er Mountains continental margin belt;(2)the Kuan-ping Late Proterozoic accretion belt of the paleocontinent;(3)the Erlangping margin basin zone;(4)the Qinling dispersion type island arc terrain; (5)the sedimentary basins of Nanqinling zone. In the light of the evolutionary stages of the sedimentary formation as well as metallogenesis, it can be classified into:(1)the sedimentary formation in the active southern margin of the pre-Mesoproterozoic North China Paleocontinent;(2)the sedimentary formation in the Middle-Late Proterozoic inactive continent margin; (3)the sedimentary formation in the early Paleozoic converse type continent margin;(4)the sedimentary formation in the Paleozoic active margin;(5)the phase of Mesozoic collision.