火山地质与矿产2001，Vol.22Issue(1)：21-30,10.
西秦岭东段构造演化及成矿作用的讨论
On several problems concerning the tectonic evolution and metallogenesis of Western Qinling, China
张传林 1董永观 2郭坤一 2赵宇2
作者信息
- 1. 南京地质矿产研究所, 中国科学院贵阳地球化学研究所,
- 2. 南京地质矿产研究所,
- 折叠
摘要
Abstract
Several new points of tectonic evolution and metallogenesis are put for ward on t he base of our and previous studies on the geological formation, structure and t exture of western Qinling orogen, China, which include: (1) Late Devonian molass stratum-Dacaotan Group (D3dc) was regarded as a pile of sheets formed by late D evonian neritic sandstone, fine sandstone and limestone thrusting onto Permian, Jurassic and Cretaeous molass. According to tectonic analysis and stragraphic st ructures, the western Qinling can be divided into three different tectonic-level sheets, the up-Paleozoic-Mesozoic surface tectonic-level parautochthonous sheet , Paleozoic shallow tectonic-level sheet and Precambrian middle to deep tectonic sheet. The three sheets were piled to each other by thrusting tectonic interfac e, (2 ) studies on the Xicheng orefield show that the orebodies occurred not only in D evonian but in Proterozoic in which the largest deposit-Changba-Lijiagou Pb-Zn d eposits occurred. The Xicheng orefield was epigensis type rather than homogensis SEDEX deposit. The metallogensis was completely controlled by th e Proterozoic thrusting from west to east and its concerning tectonic effect, (3 ) the Mianlue zone in southern Qinling is a strike-slip tectonic belt. The ophio lites in Mianlue zone and in Mian-Lue-Ning block were formed in same time and sa me tectonic background, which were Meso-Neoproterozoic oceanic crust slice and r ecorded plate tectonic evolution at that time. The study shows that there didn't exit reliable late Paleozoic ophiolite in the suthern Qinling.关键词
西秦岭/构造演化/成矿作用分类
天文与地球科学引用本文复制引用
张传林,董永观,郭坤一,赵宇..西秦岭东段构造演化及成矿作用的讨论[J].火山地质与矿产,2001,22(1):21-30,10.
