内蒙古温都尔庙地区晚古生代石炭系沉积背景:沉积岩石学、古生物学及锆石U-Pb测年证据
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摘要
苏尼特右旗温都尔庙地区作为内蒙古兴蒙造山带南侧晚古生代构造研究的重点区域,对其研究有助于了解区内盆地的沉积年代、物质来源和构造演化等问题。选择区内石炭系酒局子组、阿木山组进行剖面、古生物以及LA-ICP-MS U-Pb定年等系统研究。分析结果显示:两组地层锆石年龄均在440 Ma±,具有岩浆锆石特征,锆石磨圆分选特征均显示盆地有快速沉积、近源沉积的特征。酒局子组为一套滨浅海--沼泽-湖相沉积,磨圆分选差,局部含煤层;阿木山组为一套滨-浅海沉积环境下以灰岩为主的碳酸盐岩沉积地层。两组地层中发现了Neuropteris pseudovata、Callipteridium sp.及Schubertella sp.、Psedoschwagerina borealis等典型的晚石炭世—早二叠世植物、筳类化石。
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.
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.
引文
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[19]Jian P,Liu D Y,Shi Y R,et al.Time scale of an early to mid-Palaeozoic orogenic cycle of long-lived central Asian orogenic belt,Inner Mongolia of China:implications for continental growth[J].Lithos,2008,101(3):233-259.
[20]熊光强.内蒙古图林凯蛇绿混杂岩带地球化学、年代学特征及其地质意义:硕士学位论文[D].北京:中国地质大学,2014.XIONG Guang-qiang.Geochemistry,geochronology and its geological significance of Tulinkai ophiolite,Inner Mongolia:master's degree thesis[D].Beijing:China University of Geosciences,2014.
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