Mesoproterozoic Tectonic Characteristics of Shennongjia Group in Northern Margin of Yangtze Craton:Constraints from Detrital Zircon U-Pb Geochronology
Lu Shansong
Tong Xirun
Wu Nianwen
Jiang Tuo
Wang Zhixian
Zhou Tao
Wang Jiang
Qiu Xiaofei
Abstract：To understand the Mesoproterozoic geotectonic evolution of the northern margin of the Yangtze Craton,the U-Pb dating of detrital zircons from the sedimentary strata of the Kuangshishan,Shicaohe,and Taizi formations within the Shennongjia Group has been conducted.The results reveal prominent detrital zircon age peaks at～1.60 Ga,2.00-2.10 Ga,and 2.50-2.70 Ga,with minor populations at 2.20-2.30 Ga and rare zircons older than 2.80 Ga.The age distributions suggest that the Shennongjia Group was deposited between 1.10 and 1.60 Ga.Comparative analysis of detrital zircon age spectra from Mesoproterozoic strata across the Yangtze Craton and its continental nucleus indicates distinct age distributions between the western and northern margins,implying relatively independent tectonic evolutionary processes during the Mesoproterozoic.While the Shennongjia Group and the Dagushi Group exhibit similar age spectra,their differing peak ages in the 1.40-1.60 Ga interval suggest divergent evolutionary histories during this period.Integrating the findings with those of the previous studies,we propose that the Yangtze Craton likely comprised multiple independent microcontinents before the Mesoproterozoic,which were progressively amalgamated into the cratonic basement during Paleoproterozoic to Mesoproterozoic tectonic events.
Keywords：Shennongjia Groupdetrital zirconU-Pb ageMesoproterozoicYangtze Cratongeochronology
Publication Date：2025-07-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：15( 2613-2627 )