| 安徽巢湖地区早三叠世火山碎屑流的岩石学特征及其形成机理 |
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| 引用本文： | 李双应.安徽巢湖地区早三叠世火山碎屑流的岩石学特征及其形成机理[J].安徽地质,2000(1). |
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| 作者姓名： | 李双应 |
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| 作者单位： | 合肥工业大学资源与环境科学系!安徽 合肥 230009 |
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| 摘 要： | 安徽巢湖早三叠世青龙组南陵湖段中的火山碎屑流沉积物，由火山碎屑岩组成，可分为英安 质角砾岩、英安质晶屑－玻屑凝灰角砾岩、英安质玻屑－晶屑凝灰岩和凝灰质灰岩四种岩石类型。沉积 层序分为两个旋回，包括Ｂｏｕｍａ序列的Ａ—Ｃ、Ａ—Ｅ段。层序分析表明，是介于近源和远源之间的过渡 相，属于斜坡沉积环境，物质来源于巢湖以南的浅海区火山喷发物质。
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| 关 键 词： | 海底火山碎屑流 岩石学特征 形成机理 南陵湖段 安徽巢湖地区 |
PETROLOGICAL FEATURES AND FORMATION MECHANISM OF PYROCLASTIC FLOWS IN THE LOWER TRIASSIC NANLINHU MEMBER, CHAOXIAN, ANHUI |
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| LI Shuang - ying.PETROLOGICAL FEATURES AND FORMATION MECHANISM OF PYROCLASTIC FLOWS IN THE LOWER TRIASSIC NANLINHU MEMBER, CHAOXIAN, ANHUI[J].Geology of Anhui,2000(1). |
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| Authors: | LI Shuang - ying |
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| Abstract: | The pyroclastic flow deposits developed in the Lower Triassic Nanlinhu member, Chaoxian, Anhui, are compoesd of pyroclastic rocks which can be further divided into dacite breccia, crystal and glass shard dacite tuff breccia glass and crystal dacite tuff, and tuff. The stratigraphie sequence is classified into 2 cycles including A-C and A-E beds of Bouma sequence. Sequence analysis shows that the pyroclastic flow deposits are of transition facies between the proximal and distal facies. The sediments are of clinothem derived from the volcanic debris erupted in shallow sea area south to Chaoxian |
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| Keywords: | pyroclastic flow petrological features formation mechanism Nanlinhu member Chaoxian of Anhui |
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