松辽盆地大陆科学钻探“松科2井”登娄库组二段沉积序列精细刻画及时代归属  

Fine description and geological age delineation of sedimentary sequences of the second member of Denglouku Formation based on ICDP scientific drilling borehole in Songliao Basin( SK2)

作　　者：刘硕 高有峰 尹永康[2] 刘海波 李宏浩[2] 王璞珺[1,2] LIU Shuo;GAO You-feng;YIN Yong-kang;LIU Hai-bo;LI Hong-hao;WANG Pu-jun(Key Laboratory for Evolution of Past Life and Environment in Northeast Asia(Jilin University),Ministry of Education,Changchun 130026,China;College of Earth Sciences,Jilin University,Changchun 130061,China;Research Center of Paleontology and Stratigraphy,Jilin University,Changchun 130026,China)

机构地区：[1]吉林大学东北亚生物演化与环境教育部重点实验室,长春130026 [2]吉林大学地球科学学院,长春130061 [3]吉林大学古生物学与地层学研究中心,长春130026

出　　处：《世界地质》2019年第4期1032-1043,共12页World Geology

基　　金：国家重点研发计划项目(2019YFC0605402);国家自然科学基金(41790453);中国地质调查局油气基础性公益性地质调查项目(DD20189702)联合资助

摘　　要：松辽盆地大陆科学钻探"松科2井"连续获取登娄库组二段岩芯105.05 m,岩芯收获率为99.1%,是迄今获取的最连续完整的沉积记录。笔者对该段岩芯进行了厘米级沉积地质描述(分层厚度2~5 cm),揭示其岩性-岩相沉积序列。登娄库组二段共识别9种岩石类型,为辫状河相的废弃河道和河道亚相,并且进一步划分为河道淤积、沙滩、心滩3种沉积微相。碎屑锆石LA-ICP-MS U-Pb测年结果中登娄库组二段最年轻碎屑锆石年龄为102±4 Ma,表明松辽盆地徐家围子断陷该时期已经进入阿尔必晚期。International Continental Scientific Drilling Project( ICDP) in the Songliao Basin,named SK2,has obtained 105.05 m of continuous core of the second member of Denglouku Formation,with core recovery of99.1%,which is the most continuous and complete sedimentary record of this member.The authors carry out centimeter-scale core description( 2 ~ 5 centimeter per layer) to reveal the lithology,lithofacies and sedimentary sequences.Nine rock types have been identified in the second member of Denglouku Formation,including abandoned channel and channel sub-facies of braided river facies,which are further divided into three kinds of sedimentary microfacies,i.e.,channel siltation,sand bar and mid-channel bar.The youngest age of detrital zircon LA-ICP-MS U-Pb isotopic dating results of the second member of Denglouku Formation is 102 ± 4 Ma,indicating that the second member of Denglouku Formation formed in Xujiaweizi fault depression of Songliao Basin belongs to the late Albian period.

关 键 词：松辽盆地 松科2井 登娄库组 沉积序列 

分 类 号：P534.53[天文地球—古生物学与地层学] P539.2[天文地球—地质学]