Occurrence law and electrical characteristics of groundwater in Archean metamorphic rock area of Fuping County
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Abstract:
The Archean metamorphic rock in Fuping County has undergone multiple stages of metamorphosed deep melting,mainly composed of plutonium rich gneiss.The stratum is dense and flexible,and it is very difficult to find water because it contains a small amount of groundwater.Based on the combination of geological survey,geophysical exploration and drilling verification, this work systematically analyzed the regularity and electrical characteristics of the four types of groundwater,including structural fissure water in the metamorphic rock area,fissures in the weathering crust,pore water,layered fissure water,and contact type bedrock fissure water.The results show that the structural fissure water was mainly distributed in the structural fracture zone.The fissure porosity water in the weathering crust was widely distributed but the water volume was small.The water richness of the weathered crust and fracture zone in the valley was generally larger,the layered fissure water and the contact bedrock Fracture water was predominantly present on the contact zone of a hard brittle-soft rock combination.In the apparent resistivity section,the structural fissure water presented a steep reduction stopband,and the composite weathercock fissureporosity water presented a concave lowresistance curve.Layered fissure water surface distribution showing a horizontal low resistance curve.Bedrock fissure water contacted with the veins presented as strip-shaped high resistance+type fault low resistance reflection.
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