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地质学报  2010 

北大巴山志留系滔河口组火山碎屑岩相序、组构特征及古火山作用环境分析

, PP. 311-328

Keywords: 火山相,火山碎屑岩,沉积序列,北大巴山,滔河口组

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Abstract:

志留系滔河口组是一套发育于北大巴山地区的火山岩火山碎屑岩沉积岩组合。在1:10000地质填图和大比例地质剖面实测基础上,通过详细的火山碎屑岩相序和组构分析,本文在滔河口组火山地层中共识别和划分出22个岩相,5个相组合类型。区域岩相测量与对比揭示,滔河口组火山沉积宏观序列自下而上由玄武岩相(一般下部为块状粗粒/细粒玄武岩相、上部为枕状玄武岩相)、凝灰角砾岩相、再沉积富辉石火山碎屑砾岩相、无结构或叠瓦状凝灰质粗砾岩相、凝灰质砂岩相、生物灰岩相或泥岩相构成。岩相组合横向变化显示滔河口组古火山活动西强东弱,火山活动类型为斯托柏林型(Stromboliantypeeruption)喷发。相对地,研究区西部火山沉积序列发育较为完整。滔河口组的地层序列与岩石组合与板内火山活动产物相似,本文认为北大巴山地区志留系滔河口组火山岩火山碎屑岩沉积岩组合形成于洋岛或海山构造环境,是板内拉伸作用的产物。

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