山东胶莱盆地形成的动力学条件及其与金成矿作用的相关性讨论

山东胶莱盆地位于胶东地区的胶北隆起区和胶南造山带之间,在大地构造位置上,位于叠置在华北板块和扬子板块的拼合带部位,它的周边被深断裂所围限和控制,因此属于一个断陷盆地。自晚侏罗世至晚白垩世,胶莱盆地经历了初始拉张、强烈拉张、稳定扩张和萎缩消亡的几个构造演化阶段。它的形成和发展与中生代库拉—太平洋板块向欧亚板块俯冲以及郯—庐断裂带的强烈活动的动力学背景密切相关。胶莱盆地在形成和发育过程中,对胶北隆起区的大规模金成矿作用中的控矿构造的时空演化、矿液上侵驱动转移、成矿热动力、成矿流体和金属来源等方面均有一定的贡献。

DISCUSSION ON THE DYNAMIC CONDITIONS OF FORMATION OF JIAOLAI BASIN AND ITS RELATION TO GOLD MINERALIZATION

Jiaolai basin is located between Jiaolai uplifted area and Jiaonan orogenic belt in the Jiaodong area. Based on the geotectonic location, Jiaolai basin is situated in the collision juction of the North China Plate and the Yangtze Plate. All the margins of Jiaolai basin are bounded and controlled by the deep-seated fault zones, therefore it belongs to a fault depression basin. Jiaolai basin had undergone several tectonic evolutionary stages of the initial extension, the intensive extension, the stable extension, as well as the decline and disappear from Late Jurassic to Late Cretaceous periods. We have proposed that the formation and development of Jiaolai basin are closely related to the dynamic background of the subduction of Kula-Pacific Plate beneath the Euro-Asia Plate and the intensive activities of Tan-Lu fault zone during Mesozoic era. It should be pointed out that Jiaolai basin made some contribution to the spatial-temporal evolution of metalotectonics, the drived migration of raised ore solution, the metallogenic thermodynanics, the metallogenic fluid and the metal source in the process of large-scale mineralization in the Jiaodong area.