摘要
本文探讨自然电场法在盐湖区寻找和评价富钾卤水的应用及效果。根据罗布泊地质、水文地质和卤水化学特征研究,鉴于富钾卤水具有低电阻率的特点,论证了自然电场法在监测区找富钾卤水的地球物理机理和可行性。在罗北凹地已查明的富钾卤水区开展自然电场法测量方法试验,负异常对应干盐湖的卤水分布区,正异常主要分布于山前地区;应用于铁南凹地,自电负异常带南北长约24km,东西宽约3km,面积约100km2,解译该带为高盐度卤水的富集地。结果表明,自然电场法可为盐湖区寻找和评价卤水钾矿提供一种新的、快速的技术手段。
A large-sized brine polash deposil was recently discovered m Lop Nur, a large playa located in the easl of Tarim basin, Xinjiang. In order to increase the reserves of potash resources of Lop Nur, the authors employed the self-potential technique to seek for and evaluate potassium-rich brine in sub playas of Lop Nur. On the basis of geology, hydrogeology and brine chemistry of the playas in Lop Nur and in consideration of the low resistivity of potassium-rich brine, it is held that the self-potential technique is effective in seeking for potassium-rich brine in Lop Nut. In the brine-investigating area of Luobei depression in Lop Nur, the tentative survey was conducted by the sclf-potential means. The results show that the negative anomalies are distributed over the brine-bearing area, whereas the positive anomalies are spread over the piediment area. In Tienan depression of Lop Nur, the surveying results reveal the existence of a negative self-potential anomalous belt, which is 24 km long in S--N direction and 3 - 4 km wide in E--W direction, with the total area being some 100 km^2. This belt is likely a potassium-rich brine area. It is thus concluded that the self potential technique is a feasible and rapid method in seeking for and evaluating potassium-rich brine in playa areas.
出处
《地球学报》
EI
CAS
CSCD
北大核心
2005年第4期381-385,共5页
Acta Geoscientica Sinica
基金
国家305项目(编号:2001BA609A-07-15)
地质调查项目(编号:20001300105)
新疆优势矿产资源勘查评价项目(编号:2002102000517)资助。
