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通过对毛儿沟灰岩中段所谓“燧石层”的研究，提出火山成因的新见解，确定该岩石为蚀交流纹质沉凝灰岩。以宏观为基础，借助镜下下鉴定及各种物理化学测试手段，揭示出岩石成分以火山玻璃为主，由火山尘、玻屑、晶清、凝灰质内功屑、非火山质沉积物及生物屑等组成。火山生及脱玻化玻屑已开始蚀变，向片状、板状、絮状粘土矿物转化。还对火山物质来源作了初浅分析。关键词
Through the study of the so-called “chert layer” in the middle section of the Maoergou limestone, new insights into volcanogenic origin are proposed, and the rock is determined to be an ethen-trending sedimentary tuff. On the basis of macroscopic, with the aid of microscopic identification and various physical and chemical tests, it is revealed that the rock components are mainly volcanic glass, and are composed of volcanic dust, vitrified, clear crystal, tuff internal crumbs, non-volcanic sediments and organisms Debris and other components. Volcano Health and glass removal vitrification has begun to change to the sheet, plate, floc clay mineral conversion. Also made a brief analysis of the source of volcanic material. Key words