| 王行军,王根厚,周洁,桑学镇,崔银亮,张道红.滇东南丘北县大铁铝土矿床微量元素特征与成矿环境[J].地质找矿论丛,2015,30(3):313-320 |
| 滇东南丘北县大铁铝土矿床微量元素特征与成矿环境 |
| Research on Trace element geochemical characteristics and ore-forming environment of the Datie bauxite deposit in Qiubei county, the southeast Yunnan province |
| 投稿时间：2014-08-08 |
| DOI：10.6053/j.issn.1001-1412.2015.03.001 |
| 中文关键词: 大铁铝土矿 微量元素 成矿环境 丘北 滇东南 |
| 英文关键词:Datie bauxite deposit trace element ore-forming environment Qiubei county the southeast Yunnan province |
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| 中文摘要: |
| 大铁铝土矿床是近年来在滇东南地区新发现的大型铝土矿床,普遍伴生Fe,Ti,Ga,为低铝高铁高钛铝土矿床。文章通过ICP-MS分析测试,研究了大铁铝土矿含铝岩系微量元素的特征及成矿作用。大铁铝土矿含铝岩系Be含量(2.66×10-6)较低、Th/U值(4.83)中等、Ti含量(33702×10-6)高、LREE/HREE(10.52)中等、δ(Ce)(1.55)高,说明其成矿物质来源于风化壳,后又经历了沉积作用的改造;Ga含量(29.63×10-6)高、Sr/Ba值(11.51)高、Sr含量(70×10-6)低、Ba含量(518×10-6)高、V/Zr值(0.97)较高、Li含量(163×10-6)高,总体上显示出海相沉积特征,部分样品显示出陆相沉积特征,这也预示着其成矿物来源于风化壳,局部沉积作用改造不明显,亦显示出近源沉积的特征。研究结果表明,大铁铝土矿床含铝岩系成矿物质来源于风化壳,残积作用明显,沉积作用起到对铝土矿改造和再沉积作用;大铁铝土矿床形成于海相环境,海水对成矿物质的改造不充分,部分微量元素显示出陆相沉积的特征。 |
| 英文摘要: |
| Datie bauxite deposit is a large bauxite deposit newly discovered in the southeast Yunnan in recent years. It is low in Al, high in Fe and Ti with Fe, Ti and Ga as by-products. ICP-MS test were carried out to study characteristics of trace elements and metallogeny of the Al-bearing rock series. The results show lower Be(2.66×10-6), medium Th/U(4.83), high Ti(33702×10-6), medium LREE/HREE(10.52), high δ(Ce)(1.55) indicating that the ore materials come from weathering crust and is reworked after deposition. High Ga (29.63×10-6), high Sr/Ba (11.51), low Sr (70×10-6), high Ba (518×10-6), higher V/Zr (0.97), and high Li (163×10-6) reflect a general sea facies feature. Some samples show terrestrial facies and indicates source of the ore materials from weathering crust. Locally, no obvious reworking occurs in the sedimentation thus proximal sedimentation took place. In summary the ore materials of the Al-bearing series come from the weathering crust with obvious residual sedimentation and the bauxite is reworked and re-deposited during sedimentation; the bauxite deposit is formed under sea facies with incomplete reworking of the ore materials and terrestrial facies sedimentary feature. |
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