| 吴波,邓克勇,刘应忠,胡荣,覃红亮,陈启飞,徐安全,黄欣欣.贵州修文红黄铝土矿地质地球化学特征及成因意义[J].贵州地质,2020,37(2):144-153 |
| 贵州修文红黄铝土矿地质地球化学特征及成因意义 |
| Geological and Geochemical Characteristics and Its Genesis Significance of Honghuang Bauxite Deposit in Xiuwen, Guizhou |
| 投稿时间：2019-10-14 |
| DOI： |
| 中文关键词: 红黄铝土矿 微量元素 稀土元素 地球化学 成因意义 贵州修文 |
| 英文关键词:Honghuang bauxite Ttrace elements Rare earth elements Geochemistry Genetic significance Xiuwen Guizhou |
| 基金项目:本文受NSFC-贵州省喀斯特中心项目“石炭纪-二叠纪古喀斯特演化与铝土矿成矿机制研究”和中国矿产地质志贵州卷(DD20190379-28)联合资助。 |
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| 中文摘要: |
| 红黄铝土矿位于黔中修文铝土矿成矿带，矿体产于石炭系下统九架炉组，呈似层状、层状产于寒武系中-上统娄山关组白云岩之上，石炭系下统摆佐组灰岩之下，矿床成因类型为古风化壳沉积型。矿石自然类型以碎屑状为主。含铝岩系中主量元素以Al2O3、SiO2、TFe2O3及LOI(烧失量)为主，BaO、K2O、Na2O、P2O5等含量相对较低， SiO2、TFe2O3与Al2O3呈不显著的负相关关系，TiO2与Al2O3呈显著的正相关关系；微量元素Zr、Sr、V、Li、Ga、Sc等含量相对较高，Sn、Ta、W、Be、Pb、Cs等含量相对较低；环境敏感要素Th含量及Th/U比值表明铝土矿主要形成于半咸水-淡水沉积环境，成矿作用可能是由沉积混杂和风化沉积作用形成；Sr/Ba比值表明铝土矿经过海陆交互沉积。含铝岩系中ΣREE值较高，ΣLREE/ΣHREE比值为1457＞1，表现为轻稀土比重稀土富集，具有δEu负异常、δCe异常不明显的特征。含铝岩系Ce/Ce=1028，平均19＞1，表明含铝岩系主要形成于富氧的沉积环境。综合研究表明，本区寒武-奥陶系碳酸盐岩为铝土矿提供了丰富的成矿母质，古喀斯特岩溶盆地为铝土矿沉积提供了有利场所和剥蚀风化条件，后期构造作用和风化淋滤作用造成硅铁流失和铝的富集，最终形成优质铝土矿床。 |
| 英文摘要: |
| The Honghuang bauxite deposit is located in the Xiuwen bauxite metallogenic belt in the middle of Guizhou. The ore body is produced in the Lower Carboniferous Jiujialu Formation of the Carboniferous System, and it is above the dolomites of the Cambrian Middle-Upper System Loushanguan Formation and below the limestone of the Lower Carboniferous Baizuo Formation in the Carboniferous, the genesis type of the deposit is paleo-weathered crust deposition type. The natural type of ore is mainly detrital. The main elements in the aluminum-bearing rock series are mainly Al2O3, SiO2, TFe2O3 and LOI (loss on ignition), and the contents of BaO, K2O, Na2O and P2O5 are relatively low. SiO2, TFe2O3 and Al2O3 have an insignificant negative correlation. TiO2 has a significant positive correlation with Al2O3; the contents of trace elements Zr, Sr, V, Li, Ga, and Sc are relatively high, and the contents of Sn, Ta, W, Be, Pb, and Cs are relatively low; the environmentally sensitive element Th The content and Th / U ratio indicate that the bauxite is mainly formed in brackish water-freshwater depositional environment, and the metallogenesis may be formed by sedimentary mixing and weathering sedimentation; the Sr / Ba ratio indicates that the bauxite deposit is deposited by sea and land alternately. The ΣREE value is higher in the aluminum-bearing rock series, and the ratio of ΣLREE / ΣHREE is 1.4 ～ 5.7> 1. It is characterized by the enrichment of light rare earth and heavy rare earth, with the characteristics of negative δEu anomaly and δCe anomaly. Aluminum-bearing rock series Ce / Ce = 1.0 ～ 2.8, average 1.9> 1, indicating that the aluminum-bearing rock series are mainly formed in the oxygen-rich sedimentary environment. Comprehensive research shows that the Cambrian-Ordovician carbonate rocks in this area provide a rich ore-forming parent material for bauxite, and ancient karst karst basins provide favorable sites and erosion and weathering conditions for bauxite deposits. The effect of weathering and leaching caused the loss of ferrosilicon and the enrichment of aluminum, and eventually formed a high-quality bauxite deposit. |
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