| 论地学幸存者效应-以中上扬子五峰龙马溪组页岩为例 |
| 投稿时间：2024-07-13 修订日期：2024-10-21 |
| 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 |
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| 摘要: |
| On the Survivor Effect of Geoscience - Taking Black Shale-hosted Mineral Deposit as an ExampleMao Xiaoping1, Chen Xiurong2 |
| 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 rules governing organic matter enrichment, researchers can identify large ore deposits and rich ore bodies, thus 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 fixation and integrating them with ancient environmental studies. Furthermore, the geoscientific survivor effect is proposed. The findings indicate that relatively closed water environments serve as focal points for the accumulation of organic matter and associated minerals. After 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 decomposition efficiency of organic matter 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-Longmaxi Formation shale in the Sichuan Basin developed in a relatively closed lagoon environment characterized by a cold and humid climate, alongside a backdrop of sea 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. |
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