老挝万象北班根钾盐勘查区重力场特征及其成矿远景评价

老挝万象地区是世界级钾盐矿产的产地之一,为在钾盐勘探工作薄弱的万象北班根地区寻找优质钾盐资源,在充分吸收总结前人资料的基础上,通过在工作区实施高精度重力勘查,进行重力异常、断裂和剖面解释,利用重力资料反演三维密度界面,综合分析圈定成矿远景区。结果表明:班根钾盐勘查区布格重力异常全为负值,重力场具有西高东低的总趋势;盐岩地层的局部隆起和凹陷是引起剩余重力异常的主要原因,剩余重力负异常是寻找盐矿的有利部位;盐盆基底西部为斜坡,东南部为北西向坳陷,盐岩顶界面起伏不大;全区共划分出3类盐岩富集远景区,其中Ⅰ类远景区1个,Ⅱ类远景区2个,Ⅲ类远景区1个。

Gravity field characteristics and its metallogenic prospect evaluation of Ban keun potash exploration area in north Vientiane, Laos

Vientiane area is one of the world-classic potash resources producing area in Laos. In order to seeking for high quality potash resources at weak potash exploration area of Ban keun in North Vientiane, on the basis of fully absorbing and summarizing previous data, high precision gravity survey in the working area was carried out, gravity anomaly, fracture and profile were interpreted, 3 D density interfacies were Inverted using gravity data, metallogenic prospects were delined after comprehensive analysis. The results show that: The Bouguer gravity anomaly in the Ban Keun potash exploration area is all negative, the gravity field has the general trend of high in the west and low in the East. Local uplift and depression of salt rock strata are the main causes of residual gravity anomaly, residual negative gravity anomaly is a favorable position for salt ore exploration. The western part of salt basin basement is slope, and its southeastern part is a northwest depression. The interface of salt rock top has little fluctuation. There are three types of potash enrichment areas in the region, Containing 1 class I scenic spot, 2 class Ⅱ scenic spot and 1 class Ⅲ scenic spot.