The Metallogenic Material Sources of Permian Karst Bauxite in Pingguo Region, Guangxi
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摘要: 桂西靖西-平果铝土矿带是我国重要的铝土矿产区之一，但是二叠纪喀斯特型铝土矿成矿物质来源尚不明确。本文在1∶5万区域地质调查基础上，通过碎屑锆石LA-(MC)-ICP-MS U-Pb定年和Hf同位素研究初步分析了平果那念矿区二叠纪喀斯特型铝土矿的成矿物质来源。结果显示，两个样品碎屑锆石具单一的峰值年龄，分别为259.0 Ma和256.5 Ma，与中晚二叠世之交的岩浆活动事件相对应。锆石εHf(t)值在−1.5 ~ −16.2之间，平均-6.2，Hf同位素二阶段模式年龄峰值均在1.7 Ga左右。结合该区远岸碳酸盐岩台地的古地理格局及铝土岩系中存在的毫米级长石斑晶假象和石英斑晶，推测平果地区二叠纪喀斯特型铝土矿的成矿物质可能来源于西南方向的古特提斯二叠纪岩浆弧成因火山灰。Abstract: The Jingxi-Pingguo bauxite belt in western Guangxi is an important bauxite production area in China, but the source of metallogenic materials of Permian karst bauxite is not clear. Based on the 1:50,000 regional geological survey, the LA-(MC) -ICP-MS U-Pb dating and Hf isotope study of detrital zircons are used to preliminarily analyze the metallogenic material sources of Permian karst bauxite in Pingguo Nanian mining area. The results show that the detrital zircons of the two samples have the single peak ages of 259Ma and 256.5Ma, respectively, corresponding to the magmatic events during the turn of the Middle and Late Permian. The yielded zircon εHf(t) values range from -1.5 to -16.2, with an average of -6.2, and the peak ages of the two-stage Hf model age are around 1.7Ga. Combined with the paleogeographic pattern of the carbonate platform in the far bank of the Pingguo area and the existence of millimeter-sized feldspar porphyry and quartz porphyry in the bauxite series, it is speculated that the metallogenic material of Permian karst bauxite in Pingguo area might have been derived from the volcanic ash of Paleo Tethys magmatic arc in the southwest.
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Key words:
- bauxite /
- zircon age /
- Hf isotope /
- material source /
- Pingguo area, Guangxi
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