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An aeromagnetic survey was carried out over the Qian'an district of northeastern China. The area is underlain by a part of the Archean metamorphosed-rock series of Eastern Hebei province in China. From the total-field-intensity map, an apparent-susceptibility (SUSC) map and a regional-field map were produced. The regional-field map clearly indicates the structural trend of the Qian'an tectonic belt as well as the faults around it. The SUSC map was found to be useful in geological interpretation of the bedrock in the study area. Inferences from previous geological studies have been corrected. Subsequent field mapping in an area earlier mapped as sedimentary rocks has been shown to be an area of Archean crystalline rocks, and various units within the Archean have been reclassified. These changes have been confirmed by subsequent field work.

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