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川东地区龙潭组泥页岩地球化学特征及沉积环境——以华蓥山剖面为例
Geochemical characteristics and sedimentary environment of the Longtan Formation shale in eastern Sichuan Basin: An example of Huayingshan section
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| DOI | 10.20086/j.cnki.yskw.2025.4092 |
| 刊名 |
Acta Petrologica et Mineralogica
|
| 年，卷(期) | 2025, 44(4) |
| 作者 |
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| 作者单位 |
1. 江西应用技术职业学院自然资源部离子型稀土资源与环境重点实验室, 江西 赣州 341000; |
| 摘要 |
为探讨川东地区上二叠统龙潭组泥页岩形成的沉积环境特征、主控因素和富有机质泥页岩形成模式,以华蓥山剖面为研究对象,开展了系统的有机岩石学、有机地球化学和元素地球化学等测试。结果表明,研究区龙潭组泥页岩的物质来源复杂,Co/Th-La/Sc、La/Yb-ΣREE和TiO2-Al2O3/TiO2图解指示源岩主要为峨眉山高Ti玄武岩和中酸性火山岩; Th-Sc-Zr、Th-Co-Zr和La-Th-Sc图解表明龙潭组泥页岩物源区构造环境为被动大陆边缘环境。龙潭组泥页岩化学蚀变指数CIA平均值为80.64,属于中-高强度风化;Sr/Cu值为0.48~8.08,平均值为2.22,MgO/CaO值为0.62~52.58,平均值为14.36,反映了龙潭组沉积期整体为温暖湿润的气候条件。Sr/Ba值为0.37~1.86, 100 MgO/Al2O3值为3.27~5.45,指示龙潭期为半咸水海陆过渡环境。Zr/Al平均值为7.97×10-3, 100 Mn/Fe平均值为0.68,反映研究区龙潭期沉积水体较浅,与浅水陆棚沉积背景一致。V/(V+Ni)值为0.62~0.98,平均值为0.89,Ni/Co值介于0.47~13.81之间,平均值为5.49,Ceanom平均值为0.03,综合判识龙潭组沉积水体以弱还原至还原环境为主。结合沉积环境、有机质特征及地质背景,认为龙潭组富有机质泥页岩形成于温暖湿润的气候环境,在强风化条件下,高等植物死亡以后随玄武岩和中酸性火山岩风化形成的陆源碎屑进入沉积水体,在快速沉积速率条件下高等植物迅速沉积埋藏得以有效保存,最终形成倾气型优质泥页岩。
|
| Abstract |
In order to investigate the sedimentary environment, controlling factors and formation pattern of the shale of Longtan Formation of the Upper Permian in eastern Sichuan Basin, systematic tests of organic petrology, organic geochemistry and elemental geochemistry were conducted on the shale samples from Huayingshan profile as the research object. The results indicated that the source rock of the Longtan Formation shale in the studied area is complex. Diagrams of Co/Th-La/Sc, La/Yb-ΣREE and TiO2-Al2O3/TiO2 suggested that the source rocks of the Longtan Formation shales are mainly Emeishan basalt with high Ti content and intermediate acidic volcanic rocks. The trigonometric diagrams of Th-Sc-Zr, Th-Co-Zr and La-Th-Sc showed that the source rocks were mainly formed in the tectonic background of passive continental margin environment. The average chemical alteration index (CIA) of the Longtan Formation shale was 80.64, indicating moderate to high intensity weathering; the Sr/Cu values ranged from 0.48 to 8.08, with an average of 2.22, and the MgO/CaO values ranged from 0.62 to 52.58, with an average of 14.36, reflecting warm and humid climate condition during the sedimentation period of the Longtan Formation overall. The Sr/Ba values ranged from 0.37 to 1.86 and 100 MgO/Al2O3 values ranged from 3.27 to 5.45, indicating a semi-saline transitional sedimentary environment. The mean value of Zr/Al was 7.97×10-3 and that of 100 Mn/Fe was 0.68, indicating that the sedimentary water in the Longtan period of the Huayingshan area was relatively shallow and was also consistent with the geological background of shallow continental shelf reported by previous studies. The V/(V+Ni) values ranged from 0.62 to 0.98, averaged 0.89, Ni/Co values ranged from 0.47 to 13.81, averaged 5.49, and Ceanom values had averaged value of 0.03, suggesting that the sedimentary water of the Longtan Formation was mainly in a weakly reductive to reductive environment. In terms of sedimentary environment, organic matter characteristics and geological background, it could be inferred that the organic-rich shale of the Longtan Formation was formed in a warm and humid climate environment. In the background of strong weathering, after the death, the higher plants entered the water body accompanied with the numerous input of terrestrial debris formed by basalt and intermediate acidic volcanic rocks, and high plants rapidly deposited, buried, and effectively preserved under the background of the condition of rapid deposition, and finally that high-quantity source rock with inclined kerogen type was formed.
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| 关键词 |
龙潭组；元素地球化学；沉积环境；形成模式；川东地区
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| KeyWord |
Longtan Formation; elemental geochemistry; sedimentary environment; sedimentary model; eastern Sichuan
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| 基金项目 | |
| 页码 | 803-822 |
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