Facies Succession and Architecture of Volcaniclastic Rocks of the Taohekou Formation: Implication for Early Silurian Volcanism in the North Dabashan Area, China

• 责任者：Xiang Zhongjin (Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Yan Quanren
• 刊名：Acta Geologica Sinica
• 出版年：2010
• 卷期：84(3)
• 关键词：火山碎屑岩 ; pyroclastics ; 火山作用 ; volcanism ; 大巴山 ; Daba Mountains
• 页码：p.311-328
• 图表：8 illus., 1 table, 57 refs.
• 分类号：0801
• issnNo：ISSN0001-5717
• isbnNo：CN11-1951/P

According to the comparative studying among different sections, the authors summarized the generalized succession of the volcanic-sedimentary deposits, which to top is basalt facies (lower is massive basalts, upper is pillow basalts), tuff breccia, resedimented pyroclast-rich (or pyroxene-rich) lapillistone facies, structureless or imbricate tuffaceous conglomerate facies, tuffaceous sandstone facies (locally interbedded with calcarenite), biolithite or mudstone facies. The intensity of volcanism of west area is more powerful than the ones of east area. The type of eruption is Strombolian. The succession of Taohekou Formation, combines with geochemical of volcanic rocks or pyroxene, suggest that the tectonic setting of Taohekou Formation is ocean islands or seamounts, caused by within plate stretching.