| 张明选,代启勇,蔡丽红,陈小浪,卢俊蓉,严义强,白平.贵州大方-金沙地区九架炉组含铝岩系地质地球化学特征与沉积环境探讨[J].贵州地质,2023,40(2):109-120 |
| 贵州大方-金沙地区九架炉组含铝岩系地质地球化学特征与沉积环境探讨 |
| Geological and Geochemical Characteristics and Discussion on Sedimentary Environment of Aluminium-bearing Rock Series of the Jiujialu Formation in Dafang-Jinsha Area，Guizhou |
| 投稿时间：2023-01-28 |
| DOI： |
| 中文关键词: 地球化学特征 沉积环境 含铝岩系 九架炉组 贵州大方-金沙 |
| 英文关键词:Geochemical characteristics Sedimentary environment Aluminium-bearing rock series Jiujialu formation Dafang-Jinsha area,Guizhou |
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| 中文摘要: |
| 含铝岩系主要产于石炭系九架炉组中上部，呈似层状、层状产出，受黔中隆起影响，产于寒武系娄山关组白云岩之上、二叠系梁山组炭质粘土岩之下。针对九架炉组开展剖面测量、工程揭露、样品测试等工作，对地球化学元素分析显示，微量元素中锆、锶、钒、镓、钪等元素含量相对较高，而钽、铯、钍等其他微量元素含量相对较低。样品测试结果Sr/Ba表明含铝岩系形成于海相、海陆过渡沉积环境；同时对环境敏感元素Th统计分析，表明含铝岩系形成于海陆过渡沉积环境；Th/U表明含铝岩系处于还原环境。综合本次成果研究，九架炉组铝质岩系形成于还原的半咸水—陆相沉积环境。古喀斯特特地貌控制了九架炉组的含铝岩系的规模，古喀斯特岩溶盆地为铝质粘土岩的沉积提供了良好场所，结合地球化学特征、沉积环境和古气候等进行分析，为后续的矿产调查、勘查及综合评价提供科学依据。 |
| 英文摘要: |
| The aluminium-bearing rock series which appear as layered，are mainly occurred in bedded，near bedded in the middle and upper part of the Jiujialu formation of the Carboniferous system. Influenced by the Qianzhong uplift areas，they were formed above the dolomite of the Cambrian Loushanguan formation and below the carbonaceous claystone of the Permian Liangshan formation. The profile measurement，drilling exposure，sample testing and other geochemical element analyses in Jiujialu formation show that the contents of zirconium，strontium，vanadium，gallium，scandium and other trace elements are relatively high，while the contents of tantalum，cesium，thorium and other trace elements are relatively low. The Sr/Ba ratio of the sample indicates that the aluminium-bearing rock series are formed in Marine，land and sea transition environment. At the same time，statistical analysis of the environmentally sensitive element Th shows that they are formed in Marine and continental transitional sedimentary environment. The Th/U ratio indicates that they are in a reducing environment. In conclusion，The aluminium-bearing rock series of Jiujialu formation was formed in a reduced brackish water and continental sedimentary environment. The paleo-karst landform influenced the scale of the aluminium-bearing rock series in Jiujialu Formation.The paleo-karst basin provided a good place for the deposition of aluminous claystone. Combined with the geochemical characteristics，sedimentary environment and paleoclimate，these analyses provide scientific basis for the subsequent investigation，exploration and comprehensive evaluation of sedimentary lithium mines. |
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