Magnetotelluric sounding of deep geological framework of gold deposits in loess-covered areas:a case study of the Yanjiagou gold deposit in Huailai County, Hebei Province
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摘要: 基于岩体和矿体的电性差异,应用大地电磁测深法在河北怀来颜家沟金矿进行地球物理勘探,通过对采集原始数据的处理分析,建立电性剖面模型,依据电性剖面中的电阻率梯度分布特征,结合钻探勘查成果和高精度磁测发现的成矿异常等地质资料,预测在测区西部11号测点、南部54号测点、东部21号测点深部及附近发育的低阻异常带是有利成矿位置,并已得到部分工程验证,该成果为覆盖区隐伏矿体预测提供了科学依据。Abstract: According to the obvious differences of resistivity between major rocks and ore bodies, the magnetotellic method was em?ployed in the Yanjiagou gold deposit of Huailai County, Hebei Province. In this paper, the authors processed and analyzed the data col?lected in the study area by some precision instruments, and constructed the resistivity gradient profile model. On such a basis, some low-resistivity zones were detected, which accorded well with the result of drilling exploration and high precision magnetic survey. Some anomalous belts of low resistivity were found in the surveyed area, which are distributed at the depth of or near western site 11, south?ern site 54 and eastern site 21 and are considered to be places favorable for minerization. The study results provide useful geophysical information for prognosis of concealed orebodies in covered areas.
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Key words:
- concealed ore /
- covered area /
- magnetotelluric sounding /
- resistivity gradient /
- gold deposit /
- metallogenic prognosis
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