华南元古代地质研究进展述评

DEVELOPMENT OF RESEARCHES ON THE PROTE-ROZOIC IN SOUTH CHINA

本文简要评价了扬子地台元古代东南大陆边缘地层划分、岩石建造、同位素地质年龄及其构造意义,以及浊积岩与浊积扇等方面的最新进展,并对华南构造演化的基本模式和今后的工作提出自己的看法。文中指出将地体现点引入大脑边缘研究具有积极意义。文中涉及浙江、赣北、皖南、湘西北、黔东南、桂北等区,时间为800Ma以前。

This paper deals briefly with the last researches of the Proterozoic in southeastern continental margin of Yangzi platform, South China. 1. Ophio-lites in northeastern Jiangxi and southern Anhuei have been confirmed.2.Koma-tiites have been discovered in the Middle Proterozoic in Longcheng, northern Guangxi, with the microspinifex texture and a 1667 Ma Rb-Sr age at least. 3. The volcanic Series in South China can be divided into two parts, namely, convergent - related and divergent - related. 4. The relationship between mantle-derived granites and volcanic rocks and the characteristics of the granites from different tectonic settings have been studied. 5. Some new data of the isotopic age have been collected. 6. A summary about turbidites is given, in which turbidite fans in southeastern Gueizhou, north Guangxi and northern Jiangxi are described briefly. 7. Two models about the evolution of southeastern continental margin of Yangzi platform are suggested; a passive margin model for the western segment and a trench-arc-basin system model for the eastern segment. 8. Concepts of terrane tectonics and collisional tectonics are introduced in studies on northern Jiangxi and northern Guangxi, where some terranes have been recognized.