天桥铅锌矿床的沉积改造成矿特征

从层序地层、沉积相、矿相剖面、微量元素、稀土元素、铅同位素和包裹体等方面 ,对天桥铅锌矿床及矿床地球化学特征进行了研究 ,认为产于退积型海侵体系域中顺层的似层状铅锌矿体 ,其成因与六盘水裂陷槽演化的某个阶段特定环境有一定联系 ,成矿溶液沿裂陷槽边界断裂上升 ,挤入上覆岩层间隙乃至进入水盆地 ,对围岩发生交代作用 ,参与成岩 -后生作用、多期次的叠加、改造是该矿床的特征

SEDIMENTARY-REFORMATION METALLOGENIC CHARACTERISTICS OF THE TIANQIAO LEAD-ZINC DEPOSIT

The study of geochemical characteristics of the Tianqiao Pb\|Zn deposit in terms of sequence stratigraphy, sedimentary facies, mineral facies section, trace elements, REEs, lead isotopes, inclusions, etc., indicated that stratoid lead\|zinc ores occurring in the transgressive system of retrograding type are genetically connected with the specific environment at a certain stage of Liupanshui taphrogenic trough evolution. Ore fluid found its way upwards along the boundary fault of the taphrogenic trough and forced itself into interstices of the overlying strata. As a result, the ore fluid replaced the country rocks and was involved in diagenesis\|catagenesis and multi\|episode superimposition and transformation, which are the characteristic features of the Tianqiao Pb\|Zn deposit.