Geochronological Constraint on the Baoyintu Group and Its Tectonic Significance in Baoyintu-Huogeqi Area, Inner Mongolia
Teng Fei
Teng Xuejian
Liu Yang
He Peng
Guo Shuo
Wang Wenlong
Tian Jian
Duan Xiaolong
Abstract：The tectonic affinity of the Baoyintu uplift is still controversial.Some researchers believe that the Baoyintu uplift is a microblock in CAOB, but others suggested that its a part of the North China Craton (NCC) .The formation age and tectonic affinity of the Baoyintu Group is important to solve this problem.LA-MC-ICP-MS zircon U-Pb ages of three quartzite samples in the Baoyintu Group are analyzed in this study.The minimum age of the zircons in the first, second and third formation, respectively, is 1 284 Ma, 1 319Ma, and 1 395Ma, representing the upper limit of the sedimentary.The zircon U-Pb age of the metamorphic mafic sill is 895.5±6.8Ma, so the sedimentary age of the first to third formation of Baoyintu Group in the study area is limited to 895.5-1 284.0Ma.It can be compared with the upper Alashan Group, the upper Bayan Obo and upper Huade Group.Geochemical characteristics of amphibolite from the Baoyintu Group infer that it is located in the rift of continental margin, and might be associated with the breackup of Rodinia.The age spectra of the detrital zircons in these sedimentary are similar, and the geological events defined by the main peaks correspond to those of the NCC, indicating that detrital of the Baoyintu Group is from NCC.And the Baoyintu Group is the sediment on north margin of the NCC, the Baoyintu uplift should be a part of NCC.
Keywords：Baoyintu GroupBaoyintu upliftNeo-MesproterozoicU-Pb datinggeochronology
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：18( 161-178 )