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《Acta Geologica Sinica》 2018-06
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Chronostratigraphy and Regional Comparison of Marine Permian System in the Beishan Region,North China

NIU Yazhuo;LU Jincai;LIU Chiyang;SONG Bo;SHI Jizhong;XU Wei;State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University;Xi'an Center of Geological Survey,China Geological Survey;  
Marine Permian system in the Beishan Region,North China is one of the youngest sequences in the Central Asian Orogenic Belt.But its precision time has not been constrained due to lacking high-resolution isotopic age data.This study obtained four LA-ICP-MS zircon U-Pb ages for the volcanic rocks from the Shuangbutang Formation,285.7±2.9 Ma,280.9±2.8 Ma,279.2±4.8 Ma and 272.7±2.6 Ma.Isotopic and paleontological evidence indicates that the marine Permian in the Beishan region ranges from Artinskian to Capitanian(286~265 Ma),with the Shuangbotang,Jushitan and Jinta formations occurring in Artinskian, Wordian and Capitanian,respectively.Regional comparison shows that the marine deposition in the northern Xinjiang region ceased before the Kungurian(288 Ma)of early Permian,while the marine deposition in the Beishan and ancient Inner Mongolian regions continued until the Capitanian(265 Ma).
【Fund】: 国家自然科学基金项目(编号41402097和41402195);; 中国地质调查局矿产资源调查评价专项(编号DD20160172)资助成果
【CateGory Index】: P534.46
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