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1 IntroductionTheLuonanBasinisasmallintermountainbasin .Itisabout 1 50kmnorthwestofthecityofXi an ,China .Thelengthofthebasinisabout 50kmfromwesttoeastandthewidthis 1 0— 2 0kmfromnorthtosouth .Theflooriswideatitswesternendandnarrowatitseasternend .Slopeis