云南斗南锰矿带地质特征及找矿预测研究

Geological Characteristics and Ore-Prospecting Prediction Of Dounan Manganese Belt,Southeast

云南斗南锰矿带位于云南上扬子地台之富宁—那坡被动大陆边缘盆地与南盘江—右江山前坳陷的交汇部位,是云南省锰矿的富集地带,现已探得斗南、岩子脚等大中型锰矿床。经过研究查明了成矿带的岩浆岩、地层、构造的时空分布情况,认为本区锰矿床主要形成于断陷—岩溶凹槽内的半深海环境中,区内明苏、文麻断裂带对本区地层的沉积和锰矿的富集具有显著的控制作用,锰颗粒主要以核形石包裹体产出,与深海沉积多金属结核组构特征极为相似。并且圈定了A、B、C类预测远景区6个,其中A类预测区为最有利的成矿靶区。

Dounan manganese belt is located in upper Yangtze platform of Funing-Napo passive continental margin basin and Nanpanjiang-Youjiang piedmont depression intersection. Yunnan manganese ore is a rich zone,as has been probed in Dounan,Yanzi Feet and other large and medium manganese deposits. The study shows that the magmatic rocks,strata and tectonics of the metallogenic belt are mainly located in semi-deep sea environment of rift-karst trough,including the area of Mingsu and Wenma fault zones. The results show that the manganese particles are mainly produced in the form of nut inclusion,which is very similar to the structural characteristics of the polymetallic nodules deposited in the deep sea. We also get the forecasting prospective area of A,B and C delineated,of which A is the most favorable metallogenic target.