| 侯东壮.贵州铜仁地区九门冲组黑色页岩地球化学特征及成岩环境研究[J].地质与勘探,2019,55(3):779-788 |
| 贵州铜仁地区九门冲组黑色页岩地球化学特征及成岩环境研究 |
| Geochemical characteristics and diagenetic setting of the Jiumenchong Formation black shale in the Tongren area of Guizhou Province |
| 投稿时间：2018-07-10 修订日期：2019-01-05 |
| DOI：10.12134/j.dzykt.2019.03.009 |
| 中文关键词: 地球化学特征 沉积环境 黑色页岩 九门冲组 铜仁地区 贵州 |
| 英文关键词: geochemical characteristics, sedimentary environment, black shale, Jiumenchong Formation, Tongren area, Guizhou Province |
| 基金项目:国家自然科学基金资助项目（编号：41202051）、陕西省教育厅基金（编号：17JK0489）、西安科技大学博士启动金（编号：2016QDJ031）和培育基金（编号：201610）联合资助 |
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| 中文摘要: |
| 贵州铜仁地区九门冲组黑色页岩富含钒、镍和铀等金属元素，也是一套优质烃源岩。为了解黑色页岩的沉积环境和成因，对其进行地球化学特征研究。结果表明：Zn、Cu、Cr、Ni、U元素富集，稀土总量较高，轻稀土富集。Ce负异常、V/Cr和V/（V+Ni）表明黑色页岩形成于静水还原的斜坡环境，Co/Zn值、Zn-Ni-Co三元图、（La/Sm）N＞1、δEu正异常、La/Yb-REE图解、La-Ce关系图解和北美页岩组合样标准化曲线略左倾等反映黑色页岩沉积过程受到热液活动的影响，海底热液提供了丰富的物质来源。根据K2O/Na2O-SiO2判别图、稀土元素组合及比值等特征，反映区内构造背景以被动大陆边缘为主，由于受到热液活动的影响，也显示活动大陆边缘构造背景的特征。 |
| 英文摘要: |
| The Jiumenchong Formation black shale in the Tongren area of Guizhong Province hosts metallic elements such as V, Ni and U, and is also a set of high-quality source rocks. This work conducted geochemical research to reveal its geochemistry characteristics and diagenetic setting. The result shows that this rock is characterized by enriched Zn, Cu, Cr, Ni and U, high rare earth elements content, and relatively high content of LREE. Ce negative anomalies, V/Cr and V/(V+Ni) suggest that it was formed in euxinic sea water with reduction. Co/Zn values, Zn-Ni-Co ternary diagram, (La/Sm)N, positive anomalies of δEu, La/Yb-REE illustrations, discrimination diagrams of La/Ce, and the standardized curve of North American shale combination patterns demonstrate that this black shale had been influenced by hydrothermal activity during its disposition, and its abundant sources were from oceanic hydrothermal fluid. Discrimination diagrams of K2O/Na2O-SiO2 and REE parameters indicate that the research area was in a tectonic setting dominated by a passive continental margin, while the effect of hydrothermal activity also implies a feature of an active continental margin. |
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