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《Geological Bulletin of China》 2008-05
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Applications of combined microgravity survey and CSAMT sounding in search for concealed bauxite deposits in western Henan,China.

LIU Guo-yin~(1,2) YAN Chang-hai~(1,2) ZHAO Jian-min~(1,2) WAMG Ji-zhong~2 LI Zhong-ming~(1,2) 1.China University of Geosciences,Beijing 100083; 2.Henan Institute of Geological Survey,Zhengzhou 450007,Henan,China  
The authors carried out 1:50000 high-precision microgravity survey through methodological experiments at the peripheries of the known bauxite mining area in western Henan and found that most ore deposits are located in gende gravity gradient zones and that areas with a comparatively stable basement are bauxite exploration targets.The burial depths of the Cenozoic cover (aluminiferous rocks) and Ordovician limestone (dolostone) bed can be directly reflected by the controllable source audio frequency magnetotelluric (CSAMT)sounding section and Kania resistivity-frequency curve inflexion and then further the burial depth of the carboniferous Benxi Formation(bauxite) may be deduced.Checks and verification of more than ten boreholes show that the ore encountering rate reaches more than 80%.The results of tests prove that the combined microgravity survey and CSAMT sounding carried out based on the geological study are an effective technique combination for looking for hidden bauxite deposits in western Henan.
【Fund】: 中国地质调查局国土资源调查项目《河南陕县—新安—济源地区铝土矿调查评价》(编号:1212010532403);; 河南省两权价款项目《河南省重要成矿区带1:5万区域矿产调查》资助。
【CateGory Index】: P631.3
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