长江中下游中生代沉积盆地的含矿建造

本文讨论了长江中下游地区中生代沉积盆地演化与成矿作用的关系。印支旋回本区在挤压构造环境下，形成坳褶盆地和海退序列的含矿建造；早中三叠世在局限台地-萨布哈环境下形成周冲村组富铁碳酸盐、铅锌、膏（盐）等合矿建造；中三餐世与三角洲前线亚相有关的沉积环境下形成黄马青组含铜砂岩建造。南象运动是一次变格运动，其界面直接控制象山组砂岩铀矿。晚自垩世与拉伸引张构造有关，形成断陷盆地中的巨厚膏盐矿产．作者认为盆地演化及卤水流体是本区多旋回成矿作用最本质的因素。

THE ORE FORMATION OF SEDIMENTARY BASIN IN MESOZOIC,MIDDLE-LOWER YANGTZE AREA

The present paper deals with the relationship of the evolution of sedhoentary basin andmineralhation during Mesozoic time.During the Indo-Sinin tectonic movement,a series of downwarping basins were formedand those of the sediments of ore formation in a regression sequence were deposited. In theearly Middle Triassic, locally occurred a Sabkha circumstance and evaporite as well as hteh fer-ric carbonate and Pb-Zn deposits were formed,i. e. the Zhouchongcun group. In the MiddleTriassic, Cupreous sandstone formation was deposited in a front delta conditbo as tlie Huang-maqing group. Uraniferous Sandstones was formed below the Xiangshang formation by organ-ic processes. During the Cretaceous anhydrite (salt) beds were formed in the faulted basin thatresulted from tensional tectonism' As a whole, the basinal evolution and the brine fiuids arethe foundamental cause of the polycyclic ore formatfon.