【摘要】 陕西马元铅锌矿产于扬子板块北缘碑坝穹隆构造周缘灯影组上段。矿化受角砾状、裂隙状白云岩和放射状横向断裂组成的构造带控制。矿化强度与构造角砾岩发育程度和藻屑白云岩厚度成正相关。晚震旦世灯影期,通过基底断裂及裂隙通道产生的海水循环系统不断地萃取并吸收基底杂岩中的Pb、Zn等有用组份,运移到台坪相被藻类吸附,铅锌矿初步富集。灯影世末期,基底隆起产生灯影组容矿构造系统,同时形成构造热卤水活化、迁移吸附在藻屑白云岩中的铅锌等成份形成含矿热液,并在容矿构造带中充填富集成矿。更多还原

【Abstract】 The Mayuan lead-zinc deposit of Shaanxi province occurs in the upper part of the Dengying Formation marginal to the Beiba dome structure at the north margin of the Yangtze Plate.Mineralization is bounded by breccia and fractural rocks and structural zone constituted by radiating with horizontal trend faults.The mineralization intensity is positive related to the development of structural breccia and the thickness of algal dolomite.During the late Sinian Dengying period,the seawater circulation system formed by basement faults and fissures assimilated useful elements such as lead and zinc from the basement complex,and then transported the elements to tidal-flat facies for absorption by algal,resulting in primary enrichment of lead and zinc.In the end of the Dengying period,the uplift of the basement formed host structures in the Dengying Formation and active hot hydrothermal brine of structures,which migrated and absorbed lead and zinc in algal dolomite,forming ore-bearing hydrothermal fluid that filled into the host structures and enriched into ore deposit.更多还原