| 陈小浪,张梅梅,唐座,卢俊蓉,石国臣,代启勇.贵州威宁阳新统梁山组岩石地球化学特征及沉积环境[J].矿产勘查,2025,16(8):1881-1895 |
| 贵州威宁阳新统梁山组岩石地球化学特征及沉积环境 |
| Geochemical characteristics and sedimentary environment of Yangxin Liangshan Formation in Weining, Guizhou Province |
| 投稿时间：2024-01-11 |
| DOI：10.20008/j.kckc.202508005 |
| 中文关键词: 稀土元素 梁山组 地球化学 沉积环境 威宁地区 |
| 英文关键词: rare earth elements Liangshan Formation geochemistry sedimentary environment Weining area |
| 基金项目:本文受贵州省地质矿产勘查开发局项目“贵州省威宁地区中二叠统梁山组三稀元素富集特征及其地质因素(黔地矿科合(2017)15号)”资助。 |
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| 中文摘要: |
| 贵州威宁地区广泛分布的黏土岩，是稀土元素资源的目标层位，同时其特有的地球化学属性，在研究古气候、古沉积环境等方面具有重要意义。本文选取威宁地区梁山组地层中泥岩、砂岩以及煤开展岩矿鉴定与元素含量测试，评价了梁山组稀土元素与微量元素的富集程度，讨论了梁山组古沉积环境。研究表明:威宁地区梁山组地层稀土与微量元素含量较低，其中 Ga、Ge、Cd、Rb、Zr、Mo、Cr和 Zn与大陆地壳元素丰度相当；Se元素含量最高可达 116.06×10-6明显高于大陆地壳中 Se平均含量；Tl、Li、W、Pb、Ag相对富集，Be、 Cu、Ni、V则相对亏损；梁山组 REY(REE+，Y)含量低于大陆地壳，高于球粒陨石，且在黏土岩中含量较高，属于 LREY富集型。(La/Yb)N值介于 0.69～269.43(平均值为 60.10)，指示古气候条件温湿；δEu为 2.05、 Ceanom介于-1.17～0.3(平均值为-0.35)、Ce/La介于 0.12～8.1(平均值为 1.10)、V/Cr介于 0.94～4.94(平均值为 1.58)、Y/Ho介于 0.31～94.1(平均值为 31.94)，指示沉积环境为氧化环境；化学蚀变指数(CIA)介于 |
| 英文摘要: |
| The clay rocks are the target horizon of rare earth element resources, and their unique geochemicalproperties are of great significance in the study of paleoclimate and paledepositional environment in Weining area ofGuizhou Province. This paper selects mudstone, sandstone and coal from the Liangshan Formation in Weining areato carry out rock and mineral identification and element content test to evaluate the enrichment degree of rare earthelements and trace elements and discusses the paleosedimentary environment. The results show that the contents ofrare earth and trace elements are low, and the Ga, Ge, Cd, Rb, Zr, Mo, Cr and Zn are similar to elemental content incontinental crust. The maximum Se content is 116.06×10-6, which is significantly higher than the average Se contentin continental crust. Tl, Li, W, Pb and Ag are relatively enriched, while Be, Cu, Ni and V are relatively deficient. Thecontent of REY (REE+Y) is lower than that in continental crust, higher than that in chondrites, and higher Se contentin continental crust, belonging to the LREY enriched type. (La/Yb)N values ranged from 0.69 to 269.43 (mean:60.10), indicating that the paleoclimate conditions were warm and humid; δEu ranges from 2.05, Ceanom ranges from-1.17 to 0.3 (mean: -0.35), Ce/La ranges from 0.12 to 8.1 (mean: 1.10), V/Cr ranges from 0.94 to 4.94 (mean: 1.58),and Y/Ho ranges from 0.31 to 94.1 (mean: 31.94). The above indexes indicate that the sedimentary environment isoxidizing environment. The Chemical Index of Alteration (CIA) ranges from 64.42 to 81.64 (mean: 72.41), and the In-dex of compositional variability (ICV) ranges from 0.092 to 1.54 (mean: 0.62). The above indexes indicate that theStratum rocks of Liangshan Formation is located in the late stage of continental weathering with strong weathering. |
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