云南勐翁地区1∶5万水系沉积物测量异常特征及找矿效果分析

Anomaly Characteristics of 1∶50,000 Stream Sediments Survey and Analysis on Prospecting Effect in Mengweng Area,Yunnan

云南勐翁地区位于临沧—勐海稀有稀土多金属成矿亚带南端,花岗岩风化壳发育,稀土矿成矿条件优越。为配合区内矿产地质调查工作,缩小找矿范围,在该区开展了针对稀土矿产的1∶5万水系沉积物测量,总结了La、Y、Zr等29种元素的地球化学分布规律、富集特征、元素组合特征及异常特征,并圈定了综合异常。分析认为La、Y、Zr、W、Sn、Au是区内主成矿元素,且La、Y与F、P等相关元素异常套合较好,其异常特征明显。在水系沉积物测量基础上开展异常查证和矿产检查工作,圈定找矿靶区3处,其中1处转化为新发现矿产地,取得了较好的找矿效果。

Mengweng area of Yunnan Province is located at the southern end of Lincang-Menghai rare earth-polymetallic mineralization subzone,where granite weathering crust is well developed and rare earth mineralization conditions are favorable.In order to coordinate the geological survey of the mineral resources in the area and narrow the scope of prospecting,1∶50,000 stream sediment survey for rare earth minerals was carried out in the area,this paper summarizes the geochemistry distribution,enrichment,element combination and anomaly of 29 elements,including La,Y and Zr,and delineates the comprehensive anomaly.The analysis shows that La,Y,Zr,W,Sn and Au are the main ore-forming elements in the area.The anomaly of La,Y and other related elements such as F,P are well nested,and its abnormal characteristics are obvious.On the basis of the mea-surement of stream sediments,the work of anomaly verification and mineral inspection was carried out,and delineation of three prospecting targets,one of them was transformed into a newly discovered ore producing area,and good prospecting results have been obtained.