| 论地学幸存者效应——以中上扬子五峰龙马溪组页岩沉积环境为例 |
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| 关键词:black shale sedimentary environment paleoclimate limited environment survivor bias |
| 基金项目:国家能源碳酸盐岩油气重点实验室开放基金课题“基于浅陆封寒思路的深层-超深层古老烃源岩有机质富集机制”(编号: 33550000-24-ZC0613-0105); 贵州省科技计划项目“矿产资源数字化勘查开发技术推广”(编号: 黔科合成果[2022]重点003) |
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| The Survivor Effect of Geoscience: A Case Study of the Shale Sedimentary Environment of the Wufeng–Longmaxi Formation in the Middle–Upper Yangtze Region |
| Black shale serves as a significant repository of paleoenvironmental information, exhibiting a close genetic and spatial relationship with various associated mineralization elements and geological phenomena. By focusing on black shale and accurately analyzing its depositional environment and the mechanisms governing organic matter enrichment, researchers can identify large ore deposits and rich ore bodies, thereby offering a more nuanced interpretation of major geological events. Consequently, this research holds substantial significance. This study discusses the correlation between the depositional environment of the Wufeng Formation–Longmaxi Formation black shale and its associated elements by analyzing the principles of modern sedimentary carbon sequestration and integrating them with ancient environmental studies. Furthermore, the concept of the geoscientific survivor effect is proposed. The findings suggest that relatively closed water environments serve as focal points for the accumulation of organic matter and associated minerals. Following enrichment, these materials become remnants of geological history, preserved to the present day, whereas more open water environments are less effective at enrichment due to dilution and decomposition. Notably, the efficiency of organic matter decomposition in sediments is significantly more sensitive to temperature variations than to redox conditions. In cold temperate zones, low decomposition efficiency facilitates the preservation and enrichment of organic matter. It can be concluded that the Wufeng Formation–Longmaxi Formation shale in the Sichuan Basin developed in a relatively closed lagoon environment characterized by a cold and humid climate, alongside a marine regression; climate and water closure are the two primary factors influencing organic matter enrichment during the shale deposition period. Importantly, there is no causal relationship between organic-rich shale and its associated elements, which aligns with the geological survivor effect. This study offers a novel perspective that enhances our understanding of the enrichment environment of shale organic matter. |
| MAO Xiaoping,CHEN Xiurong.2025.The Survivor Effect of Geoscience: A Case Study of the Shale Sedimentary Environment of the Wufeng–Longmaxi Formation in the Middle–Upper Yangtze Region[J].Acta Geoscientica Sinica,46(4):659-710. |
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