陕西马元地区铅锌矿地质特征及找矿远景

陕西马元地区铅锌矿位于扬子地台北缘碑坝隆起东南缘一带。矿化带长大于60km,宽10～200m,可分为南、东、北3个铅锌矿化带,已圈出了40多条铅锌矿体。其中南矿化带长大于20km,宽20～120m,已圈出了40多条铅锌矿体;东矿化带长大于30km,宽20～200m,地表已发现7条铅锌矿体;北矿化带长大于10km,宽10～100m。矿体一般长100～2560m,厚0.80～10.01m,锌品位1.05%～10.82%,铅品位0.55%～7.54%。主矿体长2560m,厚1.46～32.53m,平均厚约7.60m,最厚28.40m,锌品位1.45%～11.42%,平均4.47%。矿化带主体由震旦系灯影组白云岩组成,产于灯影组的砾状白云质角砾岩带中。矿化主要受地层和构造的控制。经预测,马元地区铅锌矿有较好的找矿远景,具有形成超大型铅锌矿的潜力。

Geological characteristics of lead-zinc mineralized zones in the Mayuan area, Shaanxi, and their ore prospects

Lead-zinc mineralization in the Mayuan area,Shaanxi Province,occurs on the southeastern margin of the Beiba uplift on the northern margin of the Yangtze platform.It,>60 km long and 10-200 m wide,may be divided into the north,east and south mineralization zones,in which over 40 lead-zinc orebodies have been delineated.The south mineralized zone is >20 km and 20-120 m.The east mineralized zone is >30 km long and 20-200 m wide,in which seven orebodies have been found at the surface.The north mineralized zone is >10 km long and 10-100 m wide,and the orebodies are generally 100-2560 m long and 0.80-10.01 m thick with a zinc grade ranging between 1.5 and 10.82% and a lead grade of 0.55%-7.54%.The principal orebody has a length of 2560 m and ranges in thickness from 1.46 to 32.53 m,with a mean thickness of 7.60 m,and contains 1.45-11.42% zinc,averaging 4.47%.The mineralized zones are composed predominantly of dolostone of the Sinian Dengying Formation,occurring in doloruditic breccia of the Sinian Dengying Formation.The mineralization is mainly controlled by stratigraphy and structures.It is estimated that the Mayuan area has good ore prospects and potential for forming a superlarge lead-zinc deposit.