DETRITAL ZIRCON U-Pb AGES OF THE NEOPROTEROZOIC QINGSHUIJIANG FORMATION IN SOUTHEASTERN GUIZHOU AND THEIR GEOLOGICAL SIGNIFICANCE
Author(s): WEI Ya-nan, JIANG Xin-sheng, CUI Xiao-zhuang, ZHUO Jie-wen, JIANG Zhuo-fei, CAI Juan-juan, Chinese Academy of Geological Sciences, School of Geosciences and Resources, China University of Geosciences, Chengdu Center, China Geological Survey
Pages: 61-71
Year: 2015 Issue: 3
Journal: Journal of Mineralogy and Petrology
Keyword: Neoproterozoic; Qingshuijiang Formation; detrital zircon; U-Pb age spectrum;
Abstract: LA-ICP-MS U-Pb isotopic age from the Neoproterozoic Qingshuijiang Formation in the southeast of Guizhou were made and 56 effective groups of single detrital grained zircon U-Pb ages were obtained.It shows that the detrital zircon ages are primary distributed in the range of934 Ma~931 Ma,855 Ma~847 Ma,827 Ma~825 Ma,805 Ma~798 Ma,785 Ma~776 Ma and767 Ma~763 Ma,with weighted mean minimum age of 766 Ma.The age distribution has a distinct episodic style with obvious peaks,fully reflecting the magmatic and tectonic events since the Yangtze and Cathaysian plates converged.It reveals that the U-Pb age spectrum is similar to that of the western margin and northern margin of Yangtze Block,basically representing the characteristics of U-Pb age spectrum of the Yangtze block.Analysis of U-Pb age spectrum similarity indicates that the Yangtze Block and Tarim Block have a close affinity while the Yangtze Block and the North China Block have a poor one.The close affinity between the Yangtze Block and Cathaysian Block only occurred when they collided since 1 000 Ma.
Pages: 61-71
Year: 2015 Issue: 3
Journal: Journal of Mineralogy and Petrology
Keyword: Neoproterozoic; Qingshuijiang Formation; detrital zircon; U-Pb age spectrum;
Abstract: LA-ICP-MS U-Pb isotopic age from the Neoproterozoic Qingshuijiang Formation in the southeast of Guizhou were made and 56 effective groups of single detrital grained zircon U-Pb ages were obtained.It shows that the detrital zircon ages are primary distributed in the range of934 Ma~931 Ma,855 Ma~847 Ma,827 Ma~825 Ma,805 Ma~798 Ma,785 Ma~776 Ma and767 Ma~763 Ma,with weighted mean minimum age of 766 Ma.The age distribution has a distinct episodic style with obvious peaks,fully reflecting the magmatic and tectonic events since the Yangtze and Cathaysian plates converged.It reveals that the U-Pb age spectrum is similar to that of the western margin and northern margin of Yangtze Block,basically representing the characteristics of U-Pb age spectrum of the Yangtze block.Analysis of U-Pb age spectrum similarity indicates that the Yangtze Block and Tarim Block have a close affinity while the Yangtze Block and the North China Block have a poor one.The close affinity between the Yangtze Block and Cathaysian Block only occurred when they collided since 1 000 Ma.
Related Articles