北京十三陵地区中侏罗统九龙山组硅质岩成因模式及地质意义

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Analysis of genetic model of siliceous rocks of the Middle Jurassic Jiulongshan Formation in Ming Tombs area in Beijing and their geological significance

Li Kun-Peng, Xing Chao-Chao, Shen Bing

北京十三陵地区九龙山组剖面研究样品镜下照片 A—凝灰质砂岩,采样点同点2;B—凝灰岩,采样点同点14;C和D—硅质岩,采样点为点1和点9