江西中新元古代地层的划分及其与邻区对比

Subdivision of Meso-Neoproterozoic strata in Jiangxi and a correlation with the neighboring areas

作者在长期从事江西区域地质调查的基础上,通过对相关地质资料成果的收集、研究和重点考察,运用构造、岩性组合、标志层序列与同位素测年资料综合对比分析方法,重点对江西及邻区震旦纪前的中新元古界区域褶皱基底浅变质地层及其上的"青白口纪晚期"与南华纪等3套地层进行了岩石地层序列的梳理和时代划分对比,据此提出歙县—德兴蛇绿混杂岩带为华南洋残迹,其南侧的怀玉岛弧属于华夏古陆缘,对新元古代早期的弧缘盆体制和"青白口纪晚期"裂谷系统的主要特征及其发展演化进行了探讨。

On the basis of regional geologic survey that the authors have carried out for a long time in Jiangxi Province,this paper puts emphasis on the investigation of lithostratigraphic sequence and the subdivision and correlation of ages of the epimetamorphic strata of Meso-Neoproterozoic folded basement before Sinian as well as three suites of complex strata such as the late period of Qingbaikou System and Nanhua System through the collection and study of the relevant geological data in combination with the utilization of the methods of correlation and analysis of structure,lithologic assemblages,key horizon succession and isotopic dating data.The results show that the differences of the stratigraphic lithology between Jiangnan continental margin,South China oceanic basin and metamorphic basement of Huaiyu island arc is apparent,suggesting that the age of the former may be later than that of the latter.On such a basis,this paper puts forward a new opinion on the main characteristics of the arc-basin system of the early Neoproterozoic period and the rifting system of the late period of Qingbaikou System,In addition,their development and evolution are also discussed.