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Depositional environments of the organic-rich shales from the Lower Cretaceous Dalazi Formation in the Yanji and Luozigou Basins of Northeast China

文献类型：期刊论文

作者Zhao, Xiangdong1,4; Wang, Wei4; Liu, Hanlin3; Hu, Yongliang4; Zhao, Xianye2,4; Song, Chenran4; Guan, Chengguo4; Zheng, Daran4; Zhang, Haichun4
刊名MARINE AND PETROLEUM GEOLOGY
出版日期2025-09-01
卷号179页码:12
关键词Ferruginous conditions The Dalazi Formation Iron speciation Organic-rich shales Cretaceous
ISSN号0264-8172
DOI10.1016/j.marpetgeo.2025.107437
通讯作者Wang, Wei(wwang@nigpas.ac.cn) ; Liu, Hanlin(LHLDMC@163.com)
英文摘要The organic-rich shales from the Lower Cretaceous Dalazi Formation in northeastern China are well known for their rich terrestrial fossils and significant hydrocarbon potential. However, the exact depositional environments of these shales remain unclear. Here, integrated geochemical proxies, including iron speciation (Fe-HR/Fe-T, Fe-py/Fe-HR), pyrite sulfur isotopes (delta S-34(py)), and major- and trace-element enrichments were carried out on these organic-rich shales from the Zhixin section of the Yanji Basin and the Beigou section of the Luozigou Basin in Northeast China. This study aims to provide insights into the contemporaneous continental chemical weathering intensities accompanied with the lake redox conditions during the deposition of the Dalazi Formation shales. Low chemical index of alteration (CIA) values were detected in the shales, indicating low weathered continental environments during the depositional period of the shales. The reduced water availability under dry climate evidenced by plant fossils likely contributes to limiting the intensity of chemical weathering with low CIA values. All samples exhibit Fe-HR/Fe-T ratios >0.38 and Fe-py/Fe-HR ratios far below 0.7, displaying the water column characterized by anoxic ferruginous conditions with limited HS- availability during the shale deposition. The reconstruction of redox condition is consistent with the observations of the low pyrite contents, minimal well-formed framboidal pyrite crystals and covariation patterns of Mo-EF and U-EF in the shales. With low CIA values, the less continental input to the lake probably gives rise to the anoxic ferruginous deep-water conditions via limiting sulfate availability, which is consistently supported by high delta S-34(py) values (12.2 +/- 9.6 parts per thousand), low pyrite contents, and the remarkable negative correlation between the CIA and delta S-34(py) values. Considering the high content of organic matter up to 6.38 wt% and abundant fossil collections in the shales, this finding highlights the beneficial role of a sustained and stable anoxic ferruginous environment for preserving organic matter and carbonaceous fossils in the Dalazi Formation.
WOS关键词JILIN PROVINCE ; FERRUGINOUS CONDITIONS ; SEDIMENTARY-ROCKS ; OCEAN CHEMISTRY ; SULFUR ; MOLYBDENUM ; REDUCTION ; MATTER ; IRON ; PRESERVATION
资助项目Strategic Priority Research Program (B) of the Chinese Academy of Sciences[XDB0850000] ; National Natural Science Foundation of China[42402012] ; National Natural Science Foundation of China[42072036] ; National Natural Science Foundation of China[42288201] ; National Natural Science Foundation of China[41921002] ; National Natural Science Foundation of China[42130207]
WOS研究方向Geology
语种英语
WOS记录号WOS:001487981700001
出版者ELSEVIER SCI LTD
资助机构Strategic Priority Research Program (B) of the Chinese Academy of Sciences ; National Natural Science Foundation of China
源URL[http://119.78.100.205/handle/311034/24661]  
专题中国科学院古脊椎动物与古人类研究所
通讯作者Wang, Wei; Liu, Hanlin
作者单位1.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, Beijing 100044, Peoples R China
2.Vrije Univ Brussel, Archaeol Environm Changes & Geochem Grp, B-1050 Brussels, Belgium
3.PetroChina Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China
4.Chinese Acad Sci, Nanjing Inst Geol & Paleontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Peoples R China
推荐引用方式
GB/T 7714		 Zhao, Xiangdong,Wang, Wei,Liu, Hanlin,et al. Depositional environments of the organic-rich shales from the Lower Cretaceous Dalazi Formation in the Yanji and Luozigou Basins of Northeast China[J]. MARINE AND PETROLEUM GEOLOGY,2025,179:12.
APA Zhao, Xiangdong.,Wang, Wei.,Liu, Hanlin.,Hu, Yongliang.,Zhao, Xianye.,...&Zhang, Haichun.(2025).Depositional environments of the organic-rich shales from the Lower Cretaceous Dalazi Formation in the Yanji and Luozigou Basins of Northeast China.MARINE AND PETROLEUM GEOLOGY,179,12.
MLA Zhao, Xiangdong,et al."Depositional environments of the organic-rich shales from the Lower Cretaceous Dalazi Formation in the Yanji and Luozigou Basins of Northeast China".MARINE AND PETROLEUM GEOLOGY 179(2025):12.

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来源：古脊椎动物与古人类研究所

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