| 韩忠华.黔北务正道地区含铝岩系地球化学特征及地质意义[J].地质与勘探,2016,52(4):678-687 |
| 黔北务正道地区含铝岩系地球化学特征及地质意义 |
| Geochemical characteristics of bauxite deposits in the Wuchuan-Zheng′an-Daozhen area of Guizhou Province and their geological implications |
| 投稿时间：2015-10-27 修订日期：2016-03-25 |
| DOI： |
| 中文关键词: 含铝岩系 常量元素 微量元素 稀土元素 地球化学 务正道地区 |
| 英文关键词: ore-bearing rock series, invariable element trace elements, rare earth elements, geochemistry, Wuchuan-Zheng′an-Daozhen area |
| 基金项目:中国地质调查局项目“全国重要矿种成矿区划部署研究（编号:12120114051501）”资助 |
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| 中文摘要: |
| 对黔北务正道地区大竹园、岩凤阡和旦坪三个铝土矿床的含铝岩系元素地球化学特征进行了研究。结果表明，常量元素主要由Al2O3、SiO2、Fe2O3、TiO2组成，铝土矿呈富铝、低铁的特点；Zr、Sr、Cr、V、Li等微量元素含量均达到100×10-6以上，尤其以元素Li含量最高；Be含量4.04×10-6～7.04×10-6，表明铝土矿以沉积成因为主，局部地段具残积成矿的特点；Th/U介于2～7之间，揭示了铝土矿风化作用不彻底或者有沉积混杂；Sr/Ba＞1，表明铝土矿主要形成于海相沉积环境；V/Cr=0.90～1.11＜2.00、Ni/Co=0.58～4.12＜5.00、V/(V+Ni)=0.72～0.88＞0.60，表明铝土矿主要形成于富氧的沉积环境；ΣREE值总量较高，轻稀土较富集， Eu轻微正异常、Ce明显正异常；Ce/Ce﹡＞1，表明铝土矿沉积于富氧环境；La／Yb-REE关系图解中所有样品并没有集中地落在沉积岩区，表明成矿物质具有多源性。综合分析认为，本区铝土矿床为晚志留世-石炭纪形成初始矿源层，并在二叠世早期风化搬运至湖泊沼泽或近岸浅海进一步富集成矿。 |
| 英文摘要: |
| This work studied the geochemical characteristics of elements for Al-bearing rock systems in the Dazhuyuan, Danping, and Yanfengqian bauxite deposits in Wuchuan-Zheng′an-Daozhen area of Guizhou Province. Research shows that the invariable elements are in Al2O3, SiO2, Fe2O3, and TiO2. The bauxite is featured by Al-rich and low iron. The content of Zr, Sr, Cr, V, Li and other trace elements are up to 100 × 10-6 or more, particularly the highest content of element Li and Be content of 4.04 × 10-6 ~ 7.04 × 10-6. These imply that bauxite genesis is dominated by sedimentation, to deposit into because the Lord, with residual mineralization at local sites. Th / U is between 2 to 7, which reveals the incomplete bauxite weathering or having deposit mixture. That Sr / Ba> 1 shows bauxite formed in a marine sedimentary environment. That V / Cr = 0.90 ~ 1.11＜2.00, Ni / Co = 0.58 ~ 4.12＜5.00, VV + Ni) = 0.72 ~ 0.88>0.60, indicates that the bauxite deposited in an oxygen-rich environment. That the total amount of ΣREE values is high, relatively enriched in light rare earths, Eu slightly positive anomalies, Ce obviously positive anomalies; and Ce / Ce *> 1 also suggests bauxite deposited in an oxygen-rich environments. In the La / Yb-REE relationship diagram, all the samples do not concentrate in the sedimentary area, meaning multiple sources of minerals. Comprehensive analysis suggests that the initial source beds of bauxite deposits of this area formed in late Silurian - Carboniferous times, weathered and transported to lakes or swamps or offshore shallow sea in the early Permian, and further enriched and mineralized there. |
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