东南沿海成矿带矿床形成的时间演化规律研究

东南沿海成矿带成矿作用时代与华夏古陆的形成演化 ,特提斯向环太平洋构造成矿域的转换及中新生代中国东部大陆边缘构造活动关系密切。东南沿海成矿作用时代主要与该区中—新元古代古裂谷环境、晚古生代局部裂陷环境、中生代以来的伸展构造环境等拉张构造应力场相对应。中生代以来的成矿作用强度大、持续时间长 ,在东南沿海成矿史占主导地位。根据同位素测年成果厘定出特提斯向环太平洋构造成矿域转换的早期 ,即早侏罗世也存在一期重要的锡、金成矿作用。福建中部地区存在早期成矿被晚中生代构造岩浆热液作用强烈叠加的特征。文中在此基础上归纳了东南沿海成矿区不同时代区域成矿系列演化特征 ,为进一步找矿提供科学依据

STUDY ON THE EVOLUTION REGULARITY OF MINERALIZATION AGES IN SOUTHEASTERN CHINA

The mineralization ages of coastal metallogenic belt of Southeastern China are closely related to those tectonic settings which are the formation and evolution of Cathaysia, the transformation from Tethyan domain to Circum Pacific domain and the tectonic movement of continental margin since the Mesozoic era in east China. The main mineralization ages of coastal metallogenic belt of Southeastern China were corresponding to the paleo-rift in the middle and late Proterozoic, the local depression in the late Paleozoic and the extension since the Mesozoic. The mineralization since the Mesozoic, which had high intensity and long lasting time, played a leading role in the mineralization history of coastal metallogenic belt of Southeastern China. According to the results of isotopic age determination, it is confirmed that in the early Jurassic epoch, at the early stage of the transformation from Tethyan domain to Circum Pacific domain, there existed a period of important Sn and Au mineralization. The earlier-stage mineralization was intensely superposed by the tectono-magmatic thermal fluid of the later Mesozoic in the middle part of the Fujian Province. On the basis of these studies, we have made a summary on the characteristics of the evolution of mineralization series in different epochs in the coastal metallogenic belt of Southeastern China, which will provide scientific basis for further ore prospecting.