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ON THE MICROFOSSIL ASSEMBLAGES,PALEOCLIMATE INDICATOR AND OIL-CONTROLLING SIGNIFICANCE FROM THE LOWER CRETACEOUS STRATA IN THE LISHU DEPRESSION,SONGLIAO BASIN,NE CHINA
Author(s): 
Pages: 175-189
Year: Issue:  2
Journal: Acta Micropalaeontologica Sinica

Keyword:  sporopollenpaleoclimatesedimentary environmentoil-controllingLishu fault De-pressionSongliao BasinNE China;
Abstract: According to the distribution of the sporopollen components in the Lower Cretaceous strata from the Lishu fault depression of Songliao basin,sporopollen assemblages of each formations from bottom to top are identified.By analyzing the paleoenvironment indicators of sporopollen,algae and ostracods,the ancient vegetation zone,temperature,humidity and salinity are reconstructed in the Lishu depression.In the sedimentary period of the Shahezi Formation,it was a warm and humid subtropical climate,the main vegetation was coniferous forest and grass,and the lake water was fresh or brackish;in the sedimentary period of the Yingcheng Formation,it was a south Asian tropical climate,the vegetation was coniferous forest and grass,and water was also fresh and brackish.In the sedimentary period of the Denglouku Formation,the paleoclimate became hot and dry,which belongs to a tropical environment,the vegetation was coniferous forest,and water was brackish.This study provides a significant subdivision and correlation of stratigraphy,and analysis of sedimentary environment.In addition to the reconstruction of basin development,the paleoclimate change is discussed in this paper which implies their importance in controlling the oil-gas formation and preservation.
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