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A Floating Astronomical Time Scale for the Early Late Cretaceous Continental Strata in the Songliao Basin, Northeastern China

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Acta Geologica Sinica(English Edition) 2020年第1期94卷 27-37页

作者： MA Xiaojuan WU Huaichun FANG Qiang SHI Meinan ZHANG Shihong YANG Tianshui LI Haiyan WANG Chengshan Schoolof Ocean Sciences China University of GeosciencesBeijing 100083China State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesBeijing 100083China

A continuous terrestrial succession was recovered from the Songke-2(sk-2)borehole in the Songliao Basin,Northeastern China.This borehole provides a unique material for further research on the continental paleoclimate during Cretaceous greenhouse period,following a series of achievements of the Songke-1(sk-1)core.In this study,thorium(Th)logging data were chosen as a paleoclimate proxy to conduct a detailed cyclostratigraphic analysis.The Th series varies quasi-periodically;power spectra and evolutionary fast Fourier transformation(FFT)analysis reveal significant cycles in the Quantou(K2 q),Qingshankou(K2 qn),Yaojia(K2 y)and Nenjiang(K2 n)formations.The ratio of cycle wavelengths in these stratigraphic units is approximately 20:5:2:1,corresponding to long orbital eccentricity(405 kyr),short orbital eccentricity(100 kyr),obliquity(37 kyr),and precession cycles(22.5 kyr and 18.4 kyr).The durations of the K2 n,K2 y,K2 qn and K2 q are estimated as 6.97,1.83,5.30 and 4.52 Myr,respectively,based on the constructed^18.62 Myr"floating"astronomical time scale(ATS).Comparison of the durations between the sk-1 s and sk-2 boreholes exhibits a slight difference of 0.06 Myr and 0.459 Myr for K2 qn and K2 y.Nevertheless,our ATS of K2 n supports the chronostratigraphic frame constructed by the CA-ID-TIMS data of the sk-1 s borehole.This new"floating"ATS provides precise numerical ages for stratigraphic boundaries,biozones and geological events in the Songliao Basin,and can serve as a basis for correlation of strata and events between marine and terrestrial systems.

关键词： Late Cretaceous sk-2 borehole cyclostratigraphy astronomical time scale Songliao Basin northeastern China

Deep Continental Scientific Drilling Engineering Project in Songliao Basin:progress in Earth Science researcha

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China Geology 2018年第2期1卷 173-186页

作者： He-sheng Hou Cheng-shan Wang Jiao-dong Zhang Feng Ma Wei Fu Pu-jun Wang Yong-jian Huang Chang-chun Zou You-feng Gao Yuan Gao Lai-ming Zhang Jin Yang Rui Guo Chinese Academy of Geological Sciences Beijing 100037China China University ofGeasciences (Beijing) Beijing 100083China Oil and Gas Survey China Geological SurveyBeijing 100029China Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological SciencesShijiazhuang 050061China Jilin University Changchun 130061China

The Songke No.2 well (eastern hole)(referred to as Well sk-2),one of the "two wells and four holes"of the Deep Continental Scientific Drilling Engineering Project in the Songliao Basin,is in Anda City, Heilongjiang Province,and was officially completed on May 26,2018.Tlie scientific goals of Well sk-2 cover four aspects:paleoclimate research,resource and energy exploration,primary geological research, and development of deep earth exploration techniques.Since the official commencement of drilling in 2014,the Well sk-2 scientific drilling engineering team has organized and implemented drilling for coring,in situ logging,chemical analysis of core elements,and deep structural exploration around the well.Currently,the following preliminary scientific research progress has been made:4334.81 m in situ core data has been obtained;the centimeter-level high-resolution characterization of the most complete and continuous Cretaceous continental strata ever unearthed has been completed,and the standard profile of continental strata has been initially established;the unconventional natural gas resources and basin-type hot dry rocks in the deep Songliao Basin were found to have good prospects for exploration and development;the climatic evolutionary history of the Cretaceous continental strata was rebuilt for the first time,covering hundreds of thousands to millions of years,and the major events of Cretaceous climate fluctuations have been discovered;all these reveal strong evidence for the subduction and aggregation of paleo-ocean plates,providing a theoretical basis for the re-recognition of the genesis of the Songliao Basin and for deep earth oil and gas exploration.The implementation of the Deep Continental Scientific Drilling Engineering Project in the Songliao Basin is of great significance for exploring the mysteries of the Earth and solving major problems such as those related to the deep energy environment.It is a solid step along the road of "going deep into the Earth".

关键词： Songliao Basin Well sk-2 Deep energy resources Cretaceous paleoclimate Continental scientific drilling engineering

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农业知识 2003年第8期 18-19页

作者：郭洪军杨守辉泉城商保种业有限公司 251600