青海茶卡北山锂铍矿勘查区X射线荧光异常特征及找矿意义

X-ray fluorescence anomalies in the Chakabeishan exploration area for lithium-beryllium deposits,Qinghai Province:Characteristics and implications for prospecting

在青海省乌兰县茶卡北山勘查区开展了土壤X射线荧光测量勘查伟晶岩锂铍矿的研究,结果表明,通过测量Ca、Ni、Mn、Fe以及Nb、Ta、Rb、K两组指示元素,可以准确捕获花岗伟晶岩锂铍矿形成的土壤次生晕。其中,第一组元素的X射线荧光异常信息用于指示含矿层位花岗伟晶岩的位置,第二组元素的X射线荧光异常则用于圈定具有矿化显示的伟晶岩脉的位置、走向及其在平面上的延伸范围。根据捕获的X射线荧光异常推测,勘查区主矿脉沿西北、东南两个方向还有较大延伸,该结论为下一步找矿工作提供了参考。

The research on exploring pegmatite-type lithium-beryllium deposits through soil X-ray fluorescence measurements was con-ducted in the Chakabeishan exploration area of Ulan County,Qinghai Province.The results demonstrate that soil secondary halos formed by granite pegmatite-type lithium-beryllium deposits can be accurately captured by measuring two groups of indicator elements,i.e.,Ca,Ni,Mn,Fe,and Nb,Ta,Rb,K.The X-ray fluorescence anomalies of the first group of elements indicate the position of the ore-hosting horizon(i.e.,granitic pegmatites).Those of the second group of elements are used to determine the location,strike,and planar extension range of the pegmatite veins with mineralization manifestation.As inferred from the captured X-ray fluorescence a-nomalies,the main ore veins in the exploration area exhibit significant extensions along the northwest and southeast directions.This conclusion provides a reference for further prospecting work.