西北地质2017，Vol.50Issue(3)：205-221,17.
滇西北鹤庆县松桂铝土矿床地球化学特征及成矿环境分析
Geochemical Characteristics and Ore-forming Environment of the Songgui Bauxite Deposit in Heqing County, Northwest Yunnan Province
摘要
Abstract
In this paper,it took the sedimentary bauxite of the Songgui bauxite deposit as the research object,its geochemical characteristics have been studied,and then its ore-forming materials sources as well as metallogenetic environment have been discussed.The Songgui bauxite deposit is characterized by high Al2 O3 content and highA/Sratio.In aluminum-containing rock series,the overall total REE contents are higher,with large differences among the samples,moderate Eu anomaly and more positive Ce anomaly.REE distribution patterns are tilted to the right of the weak V-shaped curve or the weak M-shaped curve,reflecting the varying degree of REE fractionation.LILE (U),HFSE (Nb,Ta) and siderophile element (Cr) are significantly enriched in aluminum-containing rock series,the remaining elements are significantly loss.Cluster analysis shows that Al2O3 is positively correlated with Nb,TiO2, REE,and Li,and their correlation is obvious.Aluminum-containing rock series are associated with black metal (Ti and V),rare earth elements,and rare metals (Nb and Li),and all of these elements can be comprehensively utilizated with Al2 O3.REE distribution pattern fornormalized aluminum-containing rock series are nearly horizontal "U"-shaped curve,the TiO2/Al2 O3 ratio of Aluminum-containing rock series (17.91) is close with the TiO2/Al2O3 ratio of underlying limestone and sandstone of Beiya Formation (26.21),illustrating that the aluminiferous rock series are closely related with the underlying limestone inBeiya Formation.Among the aluminum-containing rock series,the Becontent is low (2.23 × 10-6),Th/U ratio is medium (3.68),and Ce anomalies are more negative Ce anomalies.These characteristics indicate that the ore-forming materialsof the Songgui bauxite deposit were sourced from weathering crust,and they experienced the sedimentation transformation.Ga,Sr,Ba contents andEu/Sm ratio are low (12.71 × 10-6,43.0 × 10-6,27.9 × 10-6 and0.17,respectively),which show the continental sedimentary characteristics;Sr/Ba ratio is high (1.73),which indicates the sea facies characteristics.These geochemical characteristics indicate that the ore-forming material of the Songgui bauxite deposit was came from the weathering crust,without obvious sedimentation transformation.关键词
松桂/铝土矿/地球化学特征/成矿物质来源/成矿环境Key words
Songgui/bauxite deposit/geochemical characteristics/ore-forming materials sources/mineralization environment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,崔银亮,张道红..滇西北鹤庆县松桂铝土矿床地球化学特征及成矿环境分析[J].西北地质,2017,50(3):205-221,17.基金项目
云南有色地质局“云南省铝土矿成矿规律与成矿预测研究项目”(20100610-02)、“滇东南主要铝土矿矿床构造地质和成矿作用研究项目”(20100610-03)和中国地质调查局“东天山成矿带景峡地区矿产地质调查”(121201001000150009)联合资助 （20100610-02）
