Geochronology of Bimodal Volcanic Rocks from Dingyuan Formation in Western Dabie Orogen, Central China:Implications for Extension during Breakup of Rodinia
Zhu Jiang
Peng Sanguo
Peng Lianhong
Xu Ke
Zhang Chuang
Liu Jinming
Wang Xiangdong
Abstract：In-situ zircon U-Pb ages are reported for the meta-bimodal volcanic suite of rhyolites and basalts from the Dingyuan Formation in the western Dabie orogen.The rhyolite, the rhyolitic tuff, and the basalt yield zircon U-Pb ages of 737±5 Ma (1σ, MSWD=0.02), 740±3 Ma (1σ, MSWD=0.07), 740±5 Ma (1σ, MSWD=0.07) and 739±6 Ma (1σ, MSWD=0.07), respectively, indicating that the bimodal suite was erupted during the Neoproterozoic.Intensive magmatic rocks were widespread throughout the South Qinling, Suizao, western Dabie and eastern Dabie areas during 755 to 730 Ma, such as the Yaolinghe Group, the Suixian Group, the Hong'an Group and the Dingyuan Formation.These igneous rocks show peak ages at ca.740 Ma, indicating a continental rift extensional setting in the northern margin of the Yangtze Block during the breakup of supercontinent Rodinia.
Keywords：bimodalvolcanic rockgeochronologyNeoproterozoictectonic settingDabie orogengeochemistry
Publication Date：2019-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：11( 355-365 )