| 大别造山带北部的中生代火山岩 |
| |
| 引用本文： | 杜建国,张鹏.大别造山带北部的中生代火山岩[J].现代地质,1999,13(1):57-65. |
| |
| 作者姓名： | 杜建国 张鹏 |
| |
| 作者单位： | 安徽省地质科学研究所 |
| |
| 基金项目： | 国土资源部“九五”重点科技项目 |
| |
| 摘 要： | 大别造山带北部的北淮阳中生代火山喷发岩带形成于后造山阶段的晚侏罗世—早白垩世。火山岩可以划分为２个独立的火山旋回，分别对应于高钾钙碱性系列（ＨＫＣＡ）和钾玄岩系列（ＳＨＯ），从岩石构造组合和岩石地球化学数据提供的约束条件分析，前者形成于晚侏罗世的陆内挤压环境，造山带是有“山根”的增厚陆壳，而早白垩世钾玄岩系列岩石的出现表征着造山带已发生“去根”作用，北淮阳处于陆壳减薄的拉张环境
|
| 关 键 词： | 中生代火山岩 高钾钙碱性系列 钾玄岩系列 “去根”作用 大别造山带 |
MESOZOIC VOLCANIC ROCKS IN NORTHERN PART OF DABIE OROGENIC BELT |
| |
| Du Jianguo,Zhang Peng.MESOZOIC VOLCANIC ROCKS IN NORTHERN PART OF DABIE OROGENIC BELT[J].Geoscience——Journal of Graduate School,China University of Geosciences,1999,13(1):57-65. |
| |
| Authors: | Du Jianguo Zhang Peng |
| |
| Abstract: | Mesozoic volcanic eruption belt, which locates on Beihuaiyang area in northern part of Dabie orogenic belt, formed at post orogenic stage during Late Jurassic to Early Cretaceous. The volcanic rocks can be divided into independent cycles, corresponding to high potassium calc alkline(HKCA) and shoshonite(SHO) series. Based on the analyses of petro tectonic assemblages and petrochemical data, first volcanic rock cycle(HKCA) formed at intracontinental compression and orogenic belt was in mountain root environment in Late Jurassic, another cycle(SHO) and its forming conditions indicate that Dabie orogenic belt had happened de rooting and the continental crust was thinned in Early Cretaceous. |
| |
| Keywords: | Mesozoic volcanic rock high potassium calc alkline series shoshonite series de rooting Dabie orogenic belt |
| 本文献已被 CNKI 维普 等数据库收录！ |
