云南巧家松梁铅锌矿床地质特征及构造地球化学异常模式

【作者】 李波；

【导师】 韩润生； 顾晓春；

【作者基本信息】 昆明理工大学 ， 矿产普查与勘探， 2008， 硕士

【摘要】 松梁铅锌矿床是川滇黔铅锌多金属成矿域内赋存于震旦系灯影组白云岩中的小型铅锌矿床,严格受构造控制。论文在总结矿床地质特征的基础上,重点研究了断裂结构面力学性质、构造地球化学和构造地球化学异常以及构造原生晕的轴向分带序列等方面。白云岩、断裂构造岩的微量元素聚类分析结果表明:两者元素聚类结果及其所代表的地质意义相一致;成矿流体中富集Zn-Cd-Ga-Cu贫Pb-Ge-In,并和白云岩奠定了本区铅锌成矿元素与分散元素富集的物质基础。构造岩的稀土元素球粒陨石标准化分布型式图均呈脉动式“W”型,且各稀土元素参数变化范围较小,说明它们有相同的成矿物质来源。构造岩与白云岩的REE分布模式不同,但REE总量相近,反映成矿物质来源于基底和盖层,具“多源”性。NW向与NE向REE总量很接近,且模式图形态相同,具同期构造的特点。F5断裂内构造岩的R型因子分析结果亦证明铅、锌等成矿物质为“多源”,部分来自于围岩白云岩,部分来自于基底地层,主要来源于深部热液流体。构造地球化学特征分析表明:成矿流体由南向北运移,①、②号矿体是同一成矿流体作用而成,成矿过程具有多阶段特征;重晶石化与铅锌成矿关系密切,是重要的找矿标志之一。构造原生晕综合轴向分带序列为:Li-P-Cu-Ba-Cd-Ga-Zn-V-Ag-Mn-Ge-In~2→U-Sn-Th-Be-∑REE-Pb-Bi→Cs-In-Ta-T1-Ti-Co-Nb-Mo-W-Li~2-V~2→Zr-Ni-Sr-Rb-Hf-Cr-Cs~2-∑REE~2。①号矿体构造原生晕轴向分带和地球化学参数在轴向上的变化规律表明其构造原生晕结构较复杂,反映①号矿体可能是控矿因素叠加在一起,暗示其成矿作用经历了多阶段,同时预测①号矿体深部延深较好,并有隐伏矿体存在的可能性。更多还原

【Abstract】 The Songliang Zn-Pb deposit occurs in Dengying Formation(Sinian)which is located in the Sichuan-Yunnan-Guizhou lead-zinc mineralization district,and is under control of fault strictly.Based on a study of the geological characteristics of Songliang lead-zinc deposit,this article has primarily researched the geochemical characteristics and primary halo of tectonite and so on.The cluster analyses of trace elements in dolomite and tectonite show that the associations of elements are in concordant with the geological significance that it represents.The ore-forming fluid which is rich in Zn,Cd,Ga,Cu and poor in Pb,Ge, In,lays a foundation of the ore-forming and the enrichment of dispersed elements with the dolomite.The source of ore-forming material of tectonite is the same,resulting from that the REE chondrite normatization model is the same and with a small range of their parameters.But the REE chondrite normalization model of dolomite is completely different from that of tectonite,which indicates that the material of ore-forming does not completely originate from dolomite.The result of factor analysis of R type about tectonite in F5 Fault also shows that the material of ore-forming such as Zn and Pb is partly from hydrothermal fluid.The analysis of geochemical characteristics of tectonite shows that:The direction of ore-forming fluid is from south to north,and it may experience superimposition of multiple ore-forming stages;The baritezation is closely linked with the Pb-Zn mineralization and that is the main indicators of prospecting.The axial zonal elemental sequence:Li-P-Cu-Ba-Cd-Ga-Zn-V-Ag-Mn-Ge-In~2→U-Sn-Th-Be-∑REE-Pb-Bi→Cs-In-Ta-Tl-Ti-Co-Nb-Mo-W-Li~2-V~2→Zr-Ni-Sr-Rb-Hf-Cr-Cs~2-∑REE~2,primary halo in the Songliang lead and zinc deposit is concluded,which indicates that the structure of primary halo is complex,the No.1 body may be superposed by many intermittent orebody,and the ore-forming process may experience more than one Stage of mineralization.The analyses also forecast that the No.1 body may has a good extend and there may exist concealed orebody in the deep of No.1 body.更多还原