试论河南毛集——二郎坪古裂陷带演化史

Tectonic Evolution of the Palaeo-Fault Zone in Maoji-Erlangping Area,Northwestern Henan Province

毛集—二郎坪古裂陷带的形成、发展及演化,受华北、扬子两大板块活动制约。晚元古代—早古生代时期为一边缘裂陷海盆,形成了歪头山组复理石建造和二郎坪群蛇绿岩建造,与其相伴产出了金、银、铁、铜、锌、硫、重晶石等火山成因块状硫化物矿床。华力西—印支期发展演化为裂陷带,并褶皱造山使裂陷带南北向大规模收缩,形成复式倒转褶皱系。燕山期的构造叠加,使裂陷带的构造面貌更加复杂,为金、银及多金属矿产的成矿提供了有利空间。

In the eastern part of the Qinling collision orogens with NW strike, there is a paleo-fault zone named Maoji-Erlangping, which spans Shaanxi and Henan provinces and extends for 350 km in territory of Henan Province. The formation, development and evolution of the paleo-fault zone are clearly restricted by the movement of North China plate and Yangtze plate. The paleo-fault zone was a marginal fault depression basin during the Neoproterozoic and early Paleozoic, in which deposited the Waitoushan Formation of deep-water and volcanic flysch facies and the Erlangping Group of ophiolite. And the associated massive sulfide deposits that relate to volcanism was formed simultaneously,such as gold,silver,iron,copper,zinc,sulfur,barite and so on. During the Hercynian-Indochina epoch the marginal fault depression basin developed into a fault zone with strong press of north-south direction and formed a folded chain consisting of inverted composite fold system.The superimposed tectonic deformation during the Yanshanian-Himalayan epoch made the structural appearance of the fault zone more complex, which provided the place for the deposition of gold, sliver and mutli-metal ore.