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DOI:
矿床地质:1999,Vol.>>Issue(4):300-308

试论中国东部中生代成矿大爆发
南京大学地球科学系
A preliminary discussion on the Mesozoic metallogenic explosion in east China
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中文摘要:中国东部在中生代尤其是燕山期发生了大规模的金属成矿作用,形成了一大批重要矿床,其成矿强度之高、密度之大、矿种之丰富,在全球中生代成矿作用中首屈一指,故可称为中生代成矿大爆发。研究表明,中国东部中生代成矿大爆发是该地区在特定地质背景下发生岩石圈大减薄和构造格局大转折相结合、从而导致大规模壳幔相互作用和构造圈热侵蚀事件的产物。深入研究中国东部中生代成矿大爆发的背景和过程,不仅能解决矿床学学科发展中的许多重要科学问题,为进一步寻找矿产资源指出方向,而且对认识中国大陆乃至东亚.西太平洋的地质构造演化史、探讨花岗岩类的形成环境、了解特提斯与太平洋构造域的交会结合等一系列重大基础地质问题也具有重要的意义。
中文关键词:中生代  成矿大爆发  中国东部
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.
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基金项目:国家自然科学基金重点项目(49733120)
引用文本:
华仁民,毛景文.1999.试论中国东部中生代成矿大爆发[J].矿床地质,18(4):300~308
.1999.A preliminary discussion on the Mesozoic metallogenic explosion in east China[J].Mineral Deposits18(4):300~308
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