Paleosols in an outcrop of red beds from the Upper Cretaceous Yaojia Formation,southern Songliao Basin, Jilin Province, NE China  

作　　者：Li Zhang Zhi-Dong Bao Chang-Min Zhang Lu-Xing Dou Ping Fu Jia-Hong Zhao Wu-Xue Wang Yu Ji 

机构地区：[1]School of Geosciences,Yangtze University,Wuhan 430100,Hubei Province,China [2]College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China [3]Exploration and Development Institute of PetroChina Jilin Oilfield Company,Songyuan 138000,Jilin Province,China.

出　　处：《Journal of Palaeogeography》2020年第3期353-362,共10页古地理学报（英文版）

基　　金：funded by Young Scientists Fund of the National Natural Science Foundation of China (Grant no. 41902122);the Open Foundation of Top Disciplines in Yangtze University;the Postdoctoral Innovation Post of Hubei Province (Grant no. 9621000813);the International Association of Sedimentologists’ Postgraduate Grant。

摘　　要：Paleosols in an outcrop of fluvial–lacustrine red beds have been recognized in the Upper Cretaceous Yaojia Formation in southern Songliao Basin, Songyuan City, Jilin Province, NE China. They are recognized in the field by pedogenic features, including root traces and burrows, soil horizons and soil structures. Root traces are remnants of small herbaceous plants, elongating and branching downwards in the red paleosols. They are filled by calcite,analcime, and clay minerals in spaces created by the decay of the plant roots. Burrows are found near the root traces with backfilled cells made by soil-dwelling insects. Soil horizons include calcic horizons(Bk horizon) with continuous calcareous layers, argillic horizons(Bt horizon) with clay films and dark brown to black iron-manganese cutans, vertic horizons(Bw horizon) with slickensided claystone, and deformed soil structure and gleyed horizons(Bg horizon) with mottles and reticulate mottles. Soil structures of the paleosols include pseudo-anticlinal structures,subangular blocky structures, and angular blocky structures. The micro-pedogenesis characteristics are also observed, including micrite pedogenic minerals and clay skins. Based on the pedogenic features above, paleosols types including Aridisol, Alfisol, and Vertisol are interpreted in the red beds of the Yaojia Formation. Forming in the Late Cretaceous, the paleosols can provide more details about the seasonal climate conditions and terrestrial sedimentary system in lacustrine basin.

关 键 词：Late cretaceous PALEOSOL Red bed PALAEOCLIMATE Songliao Basin 

分 类 号：P532[天文地球—古生物学与地层学] S15[天文地球—地质学]