| 中上扬子地区奥陶纪-志留纪之交火山作用对有机质富集的影响 |
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| 引用本文： | 卢贤志,沈俊,郭伟,冯庆来.中上扬子地区奥陶纪-志留纪之交火山作用对有机质富集的影响[J].地球科学,2021,46(7):2329-2340. |
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| 作者姓名： | 卢贤志 沈俊 郭伟 冯庆来 |
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| 作者单位： | 中国地质大学地质过程与矿产资源国家重点实验室,湖北武汉 430074;中国地质大学地球科学学院,湖北武汉 430074;中国地质大学地质过程与矿产资源国家重点实验室,湖北武汉 430074 |
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| 基金项目： | 国家科技重大专项项目2017ZX05036-002国家科技重大专项项目2016ZX05060-004 |
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| 摘 要： | 为了研究火山作用对黑色泥岩有机质富集机制的影响，以重庆市武隆区焦页143-5井岩心为研究对象，借助汞元素含量、总硫、总有机碳和钡元素含量等手段，分析上扬子地区奥陶系与志留系之交(五峰组-龙马溪组)火山活动和有机质富集的耦合关系.结果表明，汞元素富集层位(龙马溪组底部)对应着海洋生产力指标(总有机碳和生源钡)的高值，同时，上扬子地区多个剖面的火山凝灰岩的厚度分布与有机碳含量空间分布有很好的对应关系，亦表明火山作用与有机质富集具有紧密联系.因此，认为多期次的、广泛的火山喷发可能是奥陶纪与志留纪之交中上扬子地区有机质富集的重要原因.
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| 关 键 词： | 页岩气 生物钡 汞元素 缺氧环境 黑色泥岩 地球化学 |
| 收稿时间： | 2020-08-28 |
Influence of Mercury Geochemistry and Volcanism on the Enrichment of Organic Matter near the Ordovician Silurian Transition in the Middle and Upper Yangtze |
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| Lu Xianzhi,Shen Jun,Guo Wei,Feng Qinglai.Influence of Mercury Geochemistry and Volcanism on the Enrichment of Organic Matter near the Ordovician Silurian Transition in the Middle and Upper Yangtze[J].Earth Science-Journal of China University of Geosciences,2021,46(7):2329-2340. |
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| Authors: | Lu Xianzhi Shen Jun Guo Wei Feng Qinglai |
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| Abstract: | In order to investigate the influence of volcanism on the enrichment mechanism of organic matter in black mudstone, we analysis mercury, total sulfur, total organic carbon and barium concentrations from core JY 143-5 in Wulong District, Chongqing, exploring the relationship between volcanisms and enrichments of organic matter near the Ordovician-Silurian transition (Wufeng Formation-Longmaxi Formation) in the middle and upper Yangtze region. The results show that the enrichment intervals of mercury (the bottom of Longmaxi Formation) corresponds to the high values of marine productivity (total organic carbon and biological barium). Furthermore, the thickness of volcanic ash in the upper Yangtze area has a strong relationship with the spatial distribution of total organic carbon content, which also support the hypotheses that volcanism is closely related to the enrichment of organic matter. Therefore, this study suggests that multiple and extensive volcanic eruptions were likely tobe the main cause of the enrichment of organic matter between Ordovician and Silurian in middle-upper Yangtze region. |
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