浙江苍南望州山破火山地质特征及其形成演化  

Geologic features and evolution of Wangzhoushan caldera in Cangnan County,Zhejiang Province

作　　者：褚平利 靳国栋[2] 张炜[2] 陈荣[2] 范飞鹏[2] 段政[1,2] 余明刚 赵希林[2,3] 李龙明[3] 贺振宇[4] CHU Pingli;JIN Guodong;ZHANG Wei;CHEN Rong;FAN Feipeng;DUAN Zheng;YU Minggang;ZHAO Xilin;LI Longming;HE Zhenyu(Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China;Nanjing Center,China Geological Survey,Nanjing 210016,Jiangsu,China;Department of Resources and Environment Hefei University of Technology,Hefei 230009,Anhui,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]中国地质科学院地质研究所,北京100037 [2]中国地质调查局南京地质调查中心,江苏南京210016 [3]合肥工业大学资源与环境工程学院,安徽合肥230009 [4]北京科技大学土木与资源工程学院,北京100083

出　　处：《华东地质》2022年第4期460-473,共14页East China Geology

基　　金：中国地质调查局“武夷山松溪—庆元地区区域地质调查(编号:DD20190045)”、“华东地区区域基础地质调查(编号:DD20221633)”;国家自然科学基金“酸性火山岩的成分分层与地壳岩浆系统演化(编号:42172070)”项目联合资助。

摘　　要：相对于保存完好的新火山而言,古老火山由于经受长期剥蚀与后期构造改造能够直接出露不同时期和深度的物质组成,是火山机构解剖的理想对象。通过对古火山机构进行调查及研究,对于理解火山喷发过程和浅部岩浆系统演化具有重要研究意义,同时对活动火山的监测及灾害评估具有实践意义。文章通过系统的野外地质调查和综合研究,对浙江苍南地区望州山古火山进行了详细的剖析,根据岩性岩相平面上呈环状展布且向核部由老变新,产状围斜内倾,发育典型的环状、放射状断层以及晚期中央侵入相岩穹等特征,确认其是一座典型的复活破火山,其形成演化先后经历了初始断陷与小规模喷发、普林尼式喷发、溢流式喷发、大规模普林尼式喷发和破火山塌陷、晚期复活5个阶段。Compared with the well-preserved young volcanoes, the ancient volcanoes that have experienced long denudation and late structural transformation can directly expose the material composition of different forming time and depth, which is the ideal object for the anatomy of volcanic edifice. It plays an important role for understanding the process of volcanic eruption and the evolution of shallow magma system, and has practical significance for the monitoring and disaster assessment of active volcanoes. Based on regional geological survey and comprehensive research of Wangzhoushan ancient volcano in Cangnan, Zhejiang Province, we identify that this ancient volcano is a typical resurgent caldera according to its lithology and lithofacies plane which show annular distribution and become younger toward the core with the occurrence of inward-dipping volcano-sedimentary strata, typical ring and radial faults, and later resurgent dome. The evolution of Wangzhoushan caldera consists of six stages: initial subsidence accompanied with small eruptions, minor Plinian eruption, effusive eruption, major Plinian eruption, caldera collapse and resurgence.

关 键 词：望州山复活破火山 火山演化 火山岩相 火山断裂构造 浙江苍南 

分 类 号：P588.14[天文地球—岩石学] P52[天文地球—地质学]