中国地质Issue(1)：153-173,21.
湘南-桂东北地区寒武-奥陶纪沉积岩碎屑锆石U-Pb年代学特征及其地质意义
Detrital zircon geochronology of Cambrian-Ordovician sedimentary rocks in southern Hunan-Northeast Guangxi area and its tectonic implications
摘要
Abstract
In this paper, the authors studied detrital zircon geochronology of the Cambrian−Ordovician sedimentary rocks sampled from the southern Hunan to northeastern Guangxi area by using LA-ICP-MS and obtained 239 groups of effective age data, with the ages ranging from 3146 Ma to 474 Ma. Most of the data are concentrated in five periods, i.e., 2633−2473Ma (peak value around 2500 Ma), 1880−1521 Ma (peak value around 1650 Ma), 1146−911Ma (peak value around 970 Ma), 896−720 Ma (peak value around 800 Ma) and 682−474 Ma (peak value around 520 Ma). All the four samples recorded Paleoarchean-Mesoarchean information, and their ages are concentrated on 1146−911 Ma and 896−848 Ma, suggesting that the Grenville and Rodinia orogeny events profoundly influenced the study area. Moreover, the authors obtained a large number of ages representing the Pan-African time, implying that the global Pan-African event significantly affected the Cathaysia Block and its adjacent regions. Combined with previous researches, the authors hold that the study area is located in the southeast of the southwestern section of the collision orogenic belt between the Yangtze block and the Cathaysia block. The strata in the study area received material sources from the two blocks with the material from the Cathaysia block being dominant.关键词
碎屑锆石U-Th-Pb同位素/华夏地块/扬子地块/湘南-桂东北Key words
U-Th-Pb isotopic compositions of detrital zircons/Yangtze block/Cathaysia block/southern Hunan-northeast Guangxi分类
天文与地球科学引用本文复制引用
张雄,曾佐勋,刘伟,潘黎黎,杨宝忠,刘建雄,魏运许,贺赤诚,李绍凡..湘南-桂东北地区寒武-奥陶纪沉积岩碎屑锆石U-Pb年代学特征及其地质意义[J].中国地质,2016,(1):153-173,21.基金项目
国家自然科学基金重点项目(41230206)、中国地质调查局区域地质矿产调查项目（1212011120824）和湘西-鄂西成矿带地质矿产调查评价成果集成(12120113061700)联合资助。 （41230206）
