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Early Paleogene stratigraphic sequences,mammalian evolution and its response to environmental changes in erlian Basin,Inner Mongolia,China

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Science China Earth Sciences 2010年第12期53卷 1918-1926页

作者： Christopher K.BEARD Daniel L.GEBO Section of Vertebrate Paleontology Carnegie Museum of Natural History4400 Forbes AvenuePittsburghPA 15213USA Department of Anthropology Northern Illinois UniversityDeKalbIL 60115USA

Paleogene strata in the Huheboerhe area,erlian Basin,Inner Mongolia,China have been subdivided into three lithological units:the Nomogen Formation,the Arshanto Formation,and the Irdin Manha *** least 12 mammal-bearing horizons have been recognized in these formations,of which 4 in the Nomogen Formation,6 in the Arshanto Formation,and 2 in the Irdin Manha *** investigation proved that the "Houldjin Formation" recognized in this area by the Central Asiatic Expeditions(CAE) of the American Museum Natural History in the 1920s is actually the Irdin Manha Formation,while the "Irdin Manha Formation" of CAE is the Arshanto Formation.A recent paleomagnetic study suggests that the upper part of the Nomogen Formation is early Eocene in age and the Arshanto Formation is mainly early Eocene rather than middle Eocene as previously *** Gashatan,Bumbanian,and Arshantan land mammal ages are correlated respectively to the Thanetian,the early Ypresian,and the middle Ypresian through earliest Lutetian of the Geological Time *** land mammal ages are also correlated with the late Tiffanian through Clarkforkian,the early Wasatchian,and the middle-late Wasatchian and most of the Bridgerian of the North American Land Mammal *** the early Paleogene,the mammalian history of the erlian Basin was dominated by the appearance of new mammalian families and the replacement of a variety of genera and species,corresponding to the gradual climatic changes during this time *** abrupt emergence of several modern mammalian orders at the beginning of the Eocene is probably related to extreme climatic warming in relation to the Paleocene-Eocene Thermal Maximum.

关键词： erlian Basin Paleogene mammal faunal turnover biochronology environmental response

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Discovery of Hesigewula Sag on the western margin of Da Hinggan Mountains in China and its significance in petroleum geology

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China Geology 2019年第4期2卷 439-457页

作者： Shi-zhen Li Wei-bin Liu Dan-dan Wang Wen-hao Zhang Yan-hua Lin Shu Tao Yao-hui Xu Oil and Gas Resources Survey China Geological SurveyMinistry of Natural ResourcesBeijing 100083China China University of Geosciences(Beijing) Beijing 100083China Yangtze University Wuhan 430100China

With Songliao Basin in northeast China entering the middle-late stage of the exploration and development of oil and gas resources,it is urgent to open up new areas for oil and gas exploration on the periphery of the *** sedimentary sags have been discovered in the western margin of the Da Hinggan Mountains through high-precision gravity,magnetic,and electrical prospecting *** to the conditions of the 5 sags such as buried depth,area,and the scale of source rock,Hesigewula Sag was preferentially selected to deploy two-dimensional seismic prospecting and *** a result,the stratigraphic distribution and structure of Hesigewula Sag were preliminarily ascertained,the main sedimentary facies developed in Aershan Formation-Tengger Formation of the Lower Cretaceous was summarized,and the assessment parameters of source rock of Hesigewula Sag were *** to the research results,the Hesigewula Sag can be divided into 3 second-order tectonic units including the western bulge,the central sag,and the eastern bulge respectively,and the sag was formed mainly subject to the west *** sedimentary facies including fan delta facies,braided river delta facies,and lacustrine facies have been identified in the Aershan Formation-Tengger Formation of the *** source rock in the first member and second member of Tengger Formation in the sag features high abundance of organic matter,meeting the standards of good source *** kerogen of the source rock is mainly of type Ⅱ1-Ⅱ*** organic matter in the source rock is characterized by low maturity and it entered the evolution stage of low maturity from the second member of Tengger ***,Hesigewula Sag bears a strong similarity to other petroliferous sags in erlian Basin in structure,sedimentation,source rock,and other ***,it can be preliminarily determined that Hesigewula Sag boasts great potential for oil and gas resources.

关键词： Tectonic units Tectonic evolution Sedimentary facies Characteristics of source rock Oil and gas exploration engineering Hesigewula Sag erlian Basin Inner Mongolia China

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