论突发地质事件与形成胶莱盆地金矿关系

中生代后期 ,太平洋板块的俯冲作用使胶南地体拉分 ,断陷形成胶莱盆地。这一突发地质事件在盆地底部地势低洼部位形成局限水体 ,接受周围古老地层风化剥蚀产物的沉积而形成富含有机质、富金的莱阳群一段含矿岩系。此突发地质事件晚期的进一步改造成矿作用导致在含矿岩系不同岩性中形成不同类型的金矿床

THE RELATION BETWEEN SUDDEN GEOLOGICAL EVENT AND FORMATION OF GOLD DEPOSITS IN JIAOLAI BASIN

During the Late Mesozoic, because of subduction of the Pacific plate, the Jiaonan terrain was pulled apart and experienced an event of fault depressing, hence forming the Jiaolai Basin. In some low lands of the terrain were formed limited water bodies at the bottom of the basin in response to the sudden geological event, and were deposited abundant materials derived from weathering of the old strata in the surroundings, thus forming the organic matter\| and gold\|rich rock series of the first member of the Laiyang Group. At the late stage of the sudden geological event, further reworking\|mineralization resulted in the formation of different types of gold deposits in different lithologies of the ore\|bearing rock series.