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下江群沉积地质特征及其对华南 新元古代构造演化的约束
引用本文:张传恒,刘耀明,史晓颖,高林志,张聪.下江群沉积地质特征及其对华南 新元古代构造演化的约束[J].地球学报,2009,30(4):495-504.
作者姓名:张传恒  刘耀明  史晓颖  高林志  张聪
作者单位:中国地质大学(北京)地质过程与矿产资源国家重点实验室,中国地质大学(北京)地球科学与资源学院;中国地质科学院地质研究所;中国地质大学(北京)地质过程与矿产资源国家重点实验室,中国地质大学(北京)地球科学与资源学院;中国地质科学院地质研究所;中国地质大学(北京)地球科学与资源学院
基金项目:中国石化勘探准备项目(编号:G0800-06-ZS-319)、国家自然科学基金委员会创新群体(No.40621002)和教育部长江学者和创性团队发展计划(No.IRT00546)
摘    要:华南西部新元古代裂陷纪大地构造属性和原型盆地性质是一个涉及到扬子古陆在全球构造中的定位、且争议较大的基础地质问题。新元古代下江群发育于强变形变质的盐边群和弱变形变质的板溪群之间, 处于以滨浅海沉积为主的板溪群向深海沉积转化的过渡带内。下江群以浊流沉积的杂砂岩为主, 沉积物扩散方向指向西。下江群清水江组砂岩骨架颗粒统计分析表明, 物源来自再旋回造山带。常量元素地球化学特征显示, 下江群碎屑岩系形成于活动陆缘区的弧后盆地靠大陆一侧。结合盐边群、苏雄组大地构造属性及其与下江群的空间关系, 推测当时的华南西部处于汇聚型板块边缘内, 总体属弧后伸展型盆地。

关 键 词:下江群    华南    新元古代    沉积地质    弧后盆地

Sedimentological Features of the Xiajiang Group and Their Con-straints on the Neoproterozoic Tectonic Evolution of South China
ZHANG Chuan-heng,LIU Yao-ming,SHI Xiao-ying,GAO Lin-zhi and ZHANG Cong.Sedimentological Features of the Xiajiang Group and Their Con-straints on the Neoproterozoic Tectonic Evolution of South China[J].Acta Geoscientia Sinica,2009,30(4):495-504.
Authors:ZHANG Chuan-heng  LIU Yao-ming  SHI Xiao-ying  GAO Lin-zhi and ZHANG Cong
Institution:State Key Laboratory of Geological Processes and Mineral Resources & Key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education, China University of Geosciences;Institute of Geology, Chinese Academy of Geological Sciences;State Key Laboratory of Geological Processes and Mineral Resources & Key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education, China University of Geosciences;Institute of Geology, Chinese Academy of Geological Sciences;School of Earth Sciences and Mineral Resources, China University of Geosciences
Abstract:Middle Neoproterozoic geotectonic characteristics and proto-basin types in the western part of South China have aroused much controversy and are important implications for determining the position of the Yangtze Continent within the Rodinia configuration. The Xiajiang Group is developed between the Yanbian Group in the west characterized by strong deformation and high-grade metamorphism and the Banxi Group in the east with light deformation and low-grade metamorphism. It consists mainly of deep-sea turbidites and is regarded as a clue to finding the answer to the basic geological problems. 73 small-sized cross-beddings were measured, and the result suggests that the paleocurrent of the Xiajiang Group flowed westwards. A debris composition analysis of 33 sand-stone samples from the Qingshuijiang Formation in the middle part of the Xiajiang Group suggests that these clas-tic deposits were derived from a recycled orogenic belt. Geochemical features detected by the normal element analysis further indicate that the Xiajiang Group was developed in a retro-arc rift basin. Based on the above con-clusions in combination with the geotectonic features of the Yanbian Group and the Suxiong Formation, it is held that the western part of South China was a component part of an active continental margin during the deposition of the Xiajiang Group.
Keywords:Xiajiang Group  South China  Neoproterozoic  sedimentology  retro-arc rift basin
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