Earth Science Frontiers ›› 2024, Vol. 31 ›› Issue (1): 431-445.DOI: 10.13745/j.esf.sf.2024.1.22

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Integrated chronostratigraphic framework for Cretaceous strata in the Songliao Basin

WU Huaichun1,2,3(), LI Shan1,2,3, WANG Chengshan1,3,4, CHU Runjian1,3,4, WANG Pujun5, GAO Yuan1,3,4, WAN Xiaoqiao1,4, HE Huaiyu6, DENG Chenglong6, YANG Guang7, HUANG Yongjian1,4, GAO Youfeng5, XI Dangpeng1,4, WANG Tiantian1,3, FANG Qiang1,2,3, YANG Tianshui1,3,4, ZHANG Shihong1,3,4   

  1. 1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Beijing), Beijing 100083, China
    2. School of Ocean Sciences, China University of Geosciences (Beijing), Beijing 100083, China
    3. Frontiers Science Center for Deep-time Digital Earth, China University of Geosciences (Beijing), Beijing 100083, China
    4. School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China
    5. College of Earth Sciences, Jilin University, Changchun 130061, China
    6. Stale Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    7. Exploration Department, Jilin Oilfield Company, PetroChina, Songyuan 138000, China
  • Received:2023-12-12 Revised:2024-01-05 Online:2024-01-25 Published:2024-01-25

Abstract:

The Cretaceous is a typical greenhouse period with global large scale formation of organic-rich source rocks. However, we have only limited understanding of the terrestrial environmental status, climate change and biosphere responses and evolution during the greenhouse period; the effect of climate and environmental changes on the terrestrial organic accumulation and large scale source rock formation remains unclear. To study these issues the Songliao Basin in northeastern China offers an unique opportunity. The Songliao Basin has widespread distribution of Cretaceous source rocks and possesses the most complete sedimentary record of the Cretaceous in the world. One challenges, however, was the lack of high-quality rock records due to low continuity and low completeness of the records, which has caused controversies over the stratigraphic division of the Songliao Basin. Recently, the 8197 m drill core obtained from ICDP (Continental Scientific Drilling Program) boreholes (SK-1, SK-2, SK-3) provided a virtually complete terrestrial stratigraphic record of Cretaceous strata of the basin. In this study, by evidence synthesis using results of lithostratigraphy, biostratigraphy, magnetostratigraphy, radioisotope geochronology, and cyclostratigraphy, we constructed a high-resolution, integrated Cretaceous chronostratigraphic framework for the Songliao Basin, which provided fine chronological reference for studying the evolution of deep-time Cretaceous climate and environment as well as promoting sustainable oil and gas development in the Songliao Basin.

Key words: Cretaceous, International Continental Scientific Drilling Program (ICDP), Songliao Basin, geochronology, cyclostratigraphy

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