摘要点击次数: 5761 全文下载次数: 2873 点此下载全文
Abstract:Large-scale metallic mineralization took place in East China during Mesozoic, especially in the Yanshanian period (180 ~ 80 Ma) , which formed a great number of important mineral deposits . Compared with Mesozoic mineralization in the other parts of the world, this metallogenic event of East China is unique in its very high intensity, great extent, relatively short time, and very rich ore species. It can thus be called Mesozoic metallogenic explosion. Researches have shown that the Mesozoic metallogenic explosion resulted from combined effect of lithosphere thinning and tectonic inversion, causing large-scale curst- mantle interaction and a series of thermal erosion events in the tectonosphere, which favored the formation of large mineral deposits. Situated in the junction of Eurasia, Tethys and Pacific, East China was an assembly of several terrains. This caused the uneven spatial distribution of Mesozoic large-scale ore-forming processes in this area. The intense mineralization were usually concentrated in certain places to form ore-concentrated districts of great economic significance. The geological background, metallogenic mechanism and the tectonic positioning of major ore-concentrated districts are key problems of metallgenic research. Further studies on the background and process of Mesozoic metallogenic explosion are of great significance not only in the settlement of many important problems of mineral deposits, but also in the better understanding of the geotectonic evolution of Chinese continent, east Asia and west Pacific, the geologic environment of granite formation, and the connection and junction between Tethys and Pacific.
.1999.A preliminary discussion on the Mesozoic metallogenic explosion in east China[J].Mineral Deposits18(4):300~308