中国白垩纪陆相阶的划分与对比  

DIVISION AND CORRELATION OF TERRESTRIAL CRETACEOUS STAGES IN CHINA

作　　者：万晓樵[1] 李罡[2] 黄清华[3] 席党鹏[1] 陈丕基[2] 

机构地区：[1]生物地质与环境地质国家重点实验室(中国地质大学),北京100083 [2]现代古生物学和地层学国家重点实验室,中国科学院南京地质古生物研究所 [3]大庆油田有限责任公司勘探开发研究院

出　　处：《地层学杂志》2013年第4期457-471,共15页Journal of Stratigraphy

基　　金：国家自然科学基金(No.41172037);<国家重点基础研究发展计划>项目(2012CB822000);中国地质调查局(1212011120145);全国地层委员会"中国主要断代地层建阶研究"项目资助

摘　　要：完成陆相地层划分、赋予可与海相地层对比的年代框架是白垩纪研究的基础。白垩纪陆相地层在中国北方发育较完整,冀北—辽西地区下白垩统研究详细,松辽地区上白垩统保存完整,是建立中国白垩纪陆相阶的地层标准。通过与"国际年代地层表"对比,陆相侏罗系-白垩系界线可能位于土城子组的上部,下白垩统-上白垩统的界线位于泉头组底部,白垩系-古近系界线位于明水组二段上部。基于冀北—辽西地区和松辽盆地的地层序列,将下白垩统划分为冀北阶、热河阶和辽西阶,上白垩统划分为农安阶、松花江阶和绥化阶,底界年龄分别为145.5 Ma、130Ma、119Ma、99.6Ma、86.1Ma和79.1Ma。Nonmarine strata of Cretaceous age are well developed in North China. Their chronostratigraphic division and correlation with marine successions are a matter of intense debate in Cretaceous research. Lower Cretaceous strata have been well studied in northern Hebei and western Liaoning provinces, and the Upper Cretaceous is well developed in the Songliao area. These provide the reference sections to establish terrestrial Cretaceous stages in China. Correlation with the international geological time scale shows that the Jurassic-Cretaceous boundary is possibly placed in the upper Tuchengzi Formation, the Upper-Lower Cretaceous boundary is at the base of Quantou Formation, and the top Cretaceous boundary is in the upper part of the second member of the Mingshui Formation. Based on the distribution of nonmarine Cretaceous strata in the North China, the terrestrial Cretaceous chronostratigraphy can be subdivided into, in ascending order, the Jibeian, Jeholian and Liaoxian stages of Lower Cretaceous, and the Nonganian, Songhuajiangian, and Suihuanian stages of Upper Cretaceous. The bottom age of these stages is estimated at 145. 5 Ma, 130 Ma, 119 Ma, 99.6 Ma, 86. 1 Ma, and 79.1 Ma, respectively.

关 键 词：年代地层 陆相地层 地层划分 阶 白垩系 中国北方 

分 类 号：P534.53[天文地球—古生物学与地层学]