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| 基金项目：广西壮族自治区人力资源和社会保障厅项目“广西关键矿产资源深部勘查人才小高地”（2019—2023）(桂组通字〔2019〕85号)，广西壮族自治区科学技术项目“广西沉积型铝土矿成矿理论研究和找矿突破关键技术研发与示范”（桂科AB21196028号），广西壮族自治区地质矿产项目“桂西地区沉积型铝土矿控矿因素、成矿规律与找矿预测研究”(桂地矿综研〔2021〕85 号) |
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| 摘要： |
| 对龙州地区合山组和都安组铝土岩（矿）层进行系统采样分析，并与堆积铝土矿进行对比研究，结合含铝岩系岩性与矿物特征发现，合山组、都安组铝土岩（矿）矿石矿物无显著差异，主要为一水硬铝石、高岭石、（鲕）绿泥石，其次为赤铁矿（针铁矿）集合体和碎屑物（岩屑、玻屑、砾屑），普遍存在大量（铁）凝胶。常量、微量、稀土元素特征及相关图解显示，合山组、都安组铝土岩（矿）均可能为该区堆积铝土矿的矿源层。Ni-Cr图解显示合山组铝土岩（矿）可能来自与火山物质有关的玄武岩，都安组铝土岩（矿）来源于卡斯特岩溶，堆积铝土矿除部分落入玄武岩、碳酸盐岩区以外，大多位于页岩、板岩内，表明该区堆积铝土矿存在多源性。微量元素Be、Ga、Sr、Ba含量与Sr/Ba、V/Zr、Zr/Cu含量比值等沉积环境元素特征表明该区原生铝土岩（矿）沉积环境为陆相；δCe分析显示铝土岩（矿）沉积环境有所差异，合山组表现为氧化环境，都安组则表现为还原环境。Th、U含量及Th/U含量比值显示该区铝土岩（矿）成矿以混合作用为主，并经历了较强的风化作用；δEu分析表明合山组、都安组铝土岩（矿）分别形成于被动大陆边缘与活动大陆边缘。合山组、都安组含铝岩系均发育不同程度的铝土岩（矿）层，都安组铝土岩（矿）部分样品已达工业边界指标，可作为沉积铝土矿勘查的主要目的层。 |
| 关键词：含铝岩系 地质特征 物质来源 广西龙州 |
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| Abstract: |
| The bauxite rock (ore) layer of Heshan Formation and Du′an Formation in Longzhou area has been systematically sampled and analyzed, and compared with accumulated bauxite. The lithological and mineral characteristics of aluminum-bearing rock series reveal that there is no significant difference in the minerals of the bauxite rock (ore) of Heshan Formation and Du′an Formation, which mainly consist of diaspore, kaolinite, (oolitic) chlorite, followed by hematite (goethite) aggregate and detritus (rock chips, glass chips, gravel chips), and a large amount of (iron) gel. The characteristics of major, trace and rare earth elements and related diagrams show that the bauxite rock (ore) of Heshan Formation and Du′an Formation may be the source beds of bauxite accumulation in this area. The Ni-Cr diagram shows that the bauxite rock (ore) of Du′an Formation may come from karst, and the bauxite rock (ore) of Heshan Formation may be from basalt related to volcanic materials. Except for some in the basalt and carbonate rock areas, most of the accumulated bauxite is located in shale and slate, indicative of multiple sources. The contents of Be, Ga, Sr, Ba and the characteristics of Sr/Ba, V/Zr, Zr/Cu indicate that the sedimentary environment of the primary bauxite rock (ore) in this area was continental. The δCe analysis shows that the bauxite (ore) sedimentary environment was different, with the Du′an Formation showing a reducing environment and the Heshan Formation showing an oxidizing environment. Th, U content and Th/U content ratio show that the mineralization of bauxite rock (ore) in this area was mainly mixed and experienced strong weathering. The δEu analysis shows that the bauxite rock (ore) of Du′an Formation and Heshan Formation may be formed in active and passive continental margins respectively. The aluminum-bearing rock series of Du′an Formation and Heshan Formation have developed bauxite rock (ore) layers of different degrees, and some samples of bauxite (ore) of Du′an Formation have reached the industrial boundary index, which can be used as the main target layer of sedimentary bauxite exploration. |
| Keywords:aluminium-bearing rock series geological characteristic material source Longzhou of Guangxi |
| 韦访，黄文芳，罗家元，等.广西龙州地区双层含铝岩系地质特征与找矿意义[J].地质学刊,2023,47(4):358-368 |
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