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宣化斑脱岩产地位子河北省宣化县城西南×里之×××和×××一带,分布面积约20余平方公里。过去只是在日本占领期间,曾有日人藏田延男等到该地进行过一些调查工作,但是他们只为剥夺资源,着重作了一些油脂脱色试验。解放后由于水泥工业发展的需要,前建材部703地质队于1955及1956年间,先后在该地进行凝灰岩混合材的勘查工作,由于斑脱岩和凝灰岩密切共生在一起,故对于斑脱岩亦进行了一些工作。作者与该地质队合作,曾于1956年及1957年暑期至该区进行某凝灰岩混合材矿区外围的地质调查工作,也附带
Xuanhua spot rock production site located in Xuanhua County, Hebei Province, southwest × × × × and × × × area, the distribution area of about 20 square kilometers. In the past, during the Japanese occupation, there was a series of investigations conducted by Japanese possession of Yonago Nobuyasu, but they only focused on deprivation of resources and focused on decolorizing oils. After the liberation of the needs of the development of the cement industry, 703 geological team of the former building materials department in 1955 and 1956, successively in the tuff mixed material exploration work, as the rock-rich rocks and tuff closely together, Some work was done. In collaboration with the geology team, the authors conducted a geological survey outside the tuff mixed-metal area in the summer of 1956 and the summer of 1957, along with