As early as 1878,while carrying on his geological work in Kansu,Ludwigvon Loczy [12] visited the region under study and for the first time notedthe existence of a moderately metamorphosed rock series of mica-schist andamphibolite-schist with granite and pegmatite intrusions.The district was As early as 1878, while carrying on his geological work in Kansu, Ludwigvon Loczy [12] visited the region under study and for the first time noted the existence of a moderately metamorphosed rock series of mica-schist andamphibolite-schist with granite and pegmatite intrusions. The district was