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Article by Lyu H
Article by Wang S
Article by Xu Z
Article by Dong X
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Sedimentary background of Late Paleozoic Carboniferous in Ondor Sum, Inner Mongolia: evidence from sedimentary petrology, paleontology and zircon U-Pb dating
LYU Hong-da, WANG Shi-jie, XU Zhong-yuan, DONG Xiao-jie
College of Earth Sciences, Jilin University, Changchun 130061, China
Abstract: The study of Ondor Sum in Sunid Right Banne, the key area for the study of Late Paleozoic tectonics on the southern side of the Xingmeng orogenic belt, Inner Mongolia, is helpful to understand the depositional age, sediment source and tectonic evolution of the basin in the study area. Jiujuzi Formation and Amushan Formation in Carboniferous are chosen for a systematic study, including geological profile, paleontology and LA-ICP-MS U-Pb dating. The analysis results show that the zircon ages of the two formations are about 440 Ma, with magmatic zircon characteristics. The zircon grinding and separation characteristics suggest that the basin is characterized by rapid and proximal deposition. Jiujuzi Formation consists of a set of coastal-shallow marine-marsh-lacustrine successions with poor rounding and sorting, and locally developed coal seams. Amushan Formation comprises a set of carbonate rocks dominated by limestone in littoral-shallow marine depositional environment. Typical plant and fusulinid fossils of Late Carboniferous-Early Permian were found in both formations,such as Neuropteris pseudovata, Callipteridium sp., Schubertella sp. and Psedoschwagerina borealis.
Keywords: Ondor Sum   zircon U-Pb chronology   paleontology   Late Paleozoic   sedimentary background  
�ո����� 2019-01-03 �޻����� 2019-03-25 ����淢������  
DOI: 10.3969/j.issn.1004-5589.2019.02.002
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