中国地质Issue(1)：248-264,17.
滇东南铝土矿床地球化学特征及成矿物质来源研究
Geochemical characteristics and ore-forming materials of bauxite deposits in southeast Yunnan Province
摘要
Abstract
There exist abundant bauxite resources in southeastern Yunnan Province. Taking sedimentary bauxite deposits in <br> southeastern Yunnan Province as the research objects, the authors studied their geochemical characteristics and discussed their ore-forming material sources. These deposits are enriched in rare earth elements,dispersed elements gallium,ferrous metal element Ti and rare metal element Nb in aluminum-containing rocks, with the reserves attaining the requirements of industrial exploitation. In aluminum-containing rocks, there are generally high REE values and big differences between samples, with the characteristics of moderate Eu negative anomaly, complex Ce anomalies composed of poaitive and negative anomalies. REE distribution patterns for normalized aluminum-containing rocks exhibit rightly-oblique curve with weak“V”shape and different slopes, reflecting varying degrees of REE fractionation. REE characteristics are similar to features of underlying limestone of Weining Formation, which shows that there exists a close relationship between aluminum-containing rocks and limestones of Weining Formation. Aluminum-containing rocks are enriched in LILE elements Li, U, high field strength elements Nb, Ta, Zr, Hf, Th, transition elements V, Cr, Ti, and dispersed elements Ga, with the obvious depletion of the remaining elements. The authors found that aluminum-containing rocks deposited directly in the weathering crust. Aluminum-containing rocks have complex Ce anomalies and moderate Th/U (3-7), high Sr/Ba (>1) and high Al2O3/TiO2 (3.41-44.02), suggesting that main ore-forming materials of sedimentary bauxite deposits were derived form the weathering crust of limestones of Weining Formation, and sedimentation played the role of the reformation of the ore-forming materials of the weathering crust.关键词
铝土矿床/地球化学/成矿物质/滇东南Key words
bauxite deposit/geochemical characteristics/ore-forming materials/southeast Yunnan Province分类
天文与地球科学引用本文复制引用
王行军,王梓桐,王根厚,周洁,毕丽莎,崔银亮,张道红,李伟清,范良军..滇东南铝土矿床地球化学特征及成矿物质来源研究[J].中国地质,2015,(1):248-264,17.基金项目
云南有色地质局项目（20100610-02、20100610-03）联合资助。 （）
