Application of ICP-MS to Study the Rare Earth Element Characteristics and Sedimentary Environment of Black Shale in the Longmaxi Formation in the Southwestern Sichuan Basin
In order to study the sedimentary environment, tectonic background, and source features of the Longmaxi Formation black shale in the Yanyuan Basin, southwest Sichuan and guide regional shale gas exploration and related research, the rare earth element (REE) composition of these rocks was analyzed by...
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| Format: | Article |
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Science Press, PR China
2018-03-01
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| Series: | Yankuang ceshi |
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| Online Access: | http://www.ykcs.ac.cn/cn/article/doi/10.15898/j.cnki.11-2131/td.201705090078 |
| _version_ | 1811169438674714624 |
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| author | ZHANG Qian YU Qian WANG Jian XIAO Yuan-fu CHENG Jin-xiang ZHAO An-kun ZHANG Bin |
| author_facet | ZHANG Qian YU Qian WANG Jian XIAO Yuan-fu CHENG Jin-xiang ZHAO An-kun ZHANG Bin |
| author_sort | ZHANG Qian |
| collection | DOAJ |
| description | In order to study the sedimentary environment, tectonic background, and source features of the Longmaxi Formation black shale in the Yanyuan Basin, southwest Sichuan and guide regional shale gas exploration and related research, the rare earth element (REE) composition of these rocks was analyzed by Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) in this study. The results show that ΣREEs are low with the enrichment of light rare earth and the depletion of heavy rare earth, and significant differentiation between them. These rocks have an average <i>δ</i>Ce<sub>N</sub> value of 0.87, indicating a weakly negative Ce anomaly. They have <i>δ</i>Eu<sub>N</sub> values of 0.66-1.43 with a large variation, indicating that the composition of the source rock is complex. Average (La/Yb)<sub>S</sub> value of 1.31 indicates that tectonic background of the study area is mainly passive continental margin. The source rocks are mixed ancient sedimentary rocks, granites, and intermediate-mafic rocks. Neagtive <i>δ</i>Ce<sub>S</sub> and positive <i>δ</i>Eu<sub>S</sub> anomalies, as well as La/Ce < 1 indicate that the sedimentary water body is a reducing environment formed by a deep-water shelf sedimentation and affected by a certain degree of hydrothermal sedimentation. Deep-sea hydrothermal fluids can bring rich nutrients, which favours the formation of organic matter. The reduction of a water environment is helpful for the preservation of organic matter, hence making the study area rich in organic matter with a large thickness. It is inferred that the black shale in Longmaxi Formation is a high-quality source rock reservoir. |
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| institution | Directory Open Access Journal |
| issn | 0254-5357 |
| language | English |
| last_indexed | 2024-04-10T16:42:22Z |
| publishDate | 2018-03-01 |
| publisher | Science Press, PR China |
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| series | Yankuang ceshi |
| spelling | doaj.art-a0438817227a4d639cd85278c7d863c92023-02-08T06:31:14ZengScience Press, PR ChinaYankuang ceshi0254-53572018-03-0137221722410.15898/j.cnki.11-2131/td.201705090078ykcs-37-2-217Application of ICP-MS to Study the Rare Earth Element Characteristics and Sedimentary Environment of Black Shale in the Longmaxi Formation in the Southwestern Sichuan BasinZHANG Qian0YU Qian1WANG Jian2XIAO Yuan-fu3CHENG Jin-xiang4ZHAO An-kun5ZHANG Bin6Chengdu Geological Survey Center, China Geological Survey, Chengdu 610081, ChinaChengdu Geological Survey Center, China Geological Survey, Chengdu 610081, ChinaChengdu Geological Survey Center, China Geological Survey, Chengdu 610081, ChinaSchool of Earth Sciences, Chengdu University of Technology, Chengdu 610059, ChinaChengdu Geological Survey Center, China Geological Survey, Chengdu 610081, ChinaChengdu Geological Survey Center, China Geological Survey, Chengdu 610081, ChinaChengdu Geological Survey Center, China Geological Survey, Chengdu 610081, ChinaIn order to study the sedimentary environment, tectonic background, and source features of the Longmaxi Formation black shale in the Yanyuan Basin, southwest Sichuan and guide regional shale gas exploration and related research, the rare earth element (REE) composition of these rocks was analyzed by Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) in this study. The results show that ΣREEs are low with the enrichment of light rare earth and the depletion of heavy rare earth, and significant differentiation between them. These rocks have an average <i>δ</i>Ce<sub>N</sub> value of 0.87, indicating a weakly negative Ce anomaly. They have <i>δ</i>Eu<sub>N</sub> values of 0.66-1.43 with a large variation, indicating that the composition of the source rock is complex. Average (La/Yb)<sub>S</sub> value of 1.31 indicates that tectonic background of the study area is mainly passive continental margin. The source rocks are mixed ancient sedimentary rocks, granites, and intermediate-mafic rocks. Neagtive <i>δ</i>Ce<sub>S</sub> and positive <i>δ</i>Eu<sub>S</sub> anomalies, as well as La/Ce < 1 indicate that the sedimentary water body is a reducing environment formed by a deep-water shelf sedimentation and affected by a certain degree of hydrothermal sedimentation. Deep-sea hydrothermal fluids can bring rich nutrients, which favours the formation of organic matter. The reduction of a water environment is helpful for the preservation of organic matter, hence making the study area rich in organic matter with a large thickness. It is inferred that the black shale in Longmaxi Formation is a high-quality source rock reservoir.http://www.ykcs.ac.cn/cn/article/doi/10.15898/j.cnki.11-2131/td.201705090078yanyuan basinblack shalerare earth elementssedimentary environmentinductively coupled plasma-mass spectrometry |
| spellingShingle | ZHANG Qian YU Qian WANG Jian XIAO Yuan-fu CHENG Jin-xiang ZHAO An-kun ZHANG Bin Application of ICP-MS to Study the Rare Earth Element Characteristics and Sedimentary Environment of Black Shale in the Longmaxi Formation in the Southwestern Sichuan Basin Yankuang ceshi yanyuan basin black shale rare earth elements sedimentary environment inductively coupled plasma-mass spectrometry |
| title | Application of ICP-MS to Study the Rare Earth Element Characteristics and Sedimentary Environment of Black Shale in the Longmaxi Formation in the Southwestern Sichuan Basin |
| title_full | Application of ICP-MS to Study the Rare Earth Element Characteristics and Sedimentary Environment of Black Shale in the Longmaxi Formation in the Southwestern Sichuan Basin |
| title_fullStr | Application of ICP-MS to Study the Rare Earth Element Characteristics and Sedimentary Environment of Black Shale in the Longmaxi Formation in the Southwestern Sichuan Basin |
| title_full_unstemmed | Application of ICP-MS to Study the Rare Earth Element Characteristics and Sedimentary Environment of Black Shale in the Longmaxi Formation in the Southwestern Sichuan Basin |
| title_short | Application of ICP-MS to Study the Rare Earth Element Characteristics and Sedimentary Environment of Black Shale in the Longmaxi Formation in the Southwestern Sichuan Basin |
| title_sort | application of icp ms to study the rare earth element characteristics and sedimentary environment of black shale in the longmaxi formation in the southwestern sichuan basin |
| topic | yanyuan basin black shale rare earth elements sedimentary environment inductively coupled plasma-mass spectrometry |
| url | http://www.ykcs.ac.cn/cn/article/doi/10.15898/j.cnki.11-2131/td.201705090078 |
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