| 北票-义县地区义县组火山构造及其与化石沉积层的关系 |
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| 引用本文：张立东,郭胜哲,张长捷,彭艳东,贾斌,陈树旺,邢德和,丁秋红,郑月娟.2004.北票-义县地区义县组火山构造及其与化石沉积层的关系[J].地球学报,25(6):639-646. |
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| 基金项目:中国地质调查局"北票市等四幅1:5万区调项目"(编号:4.1.12J) |
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| 中文摘要:义县火山旋回发育于早白垩世，可以划分出4个亚旋回，具有由西向东迁移，由基性向中基性、中酸性演化的特点，并形成了一系列不同级别的火山构造。区内主要为四至六级火山构造，包括火山构造洼地、层状火山、破火山和穹状火山等。不同级别、不同发展阶段的火山构造对化石沉积层的形成、分布和保存起到了不同的作用。三级火山构造控制了义县火山一沉积岩系呈NE向展布；四级火山构造形成了两大火山洼地，并在两个火山构造洼地中分别形成了相对独立的沉积层；五至六级火山构造直接影响了化石沉积层的空间形态和物质组成。 |
| 中文关键词:义县组 火山构造 北票—义县地区 |
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| Volcanic Structures in Beipiao-Yixian Area and Their Relationship to Fossil-bearing Beds of Yixian Formation |
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| Abstract:The Yixian volcanic cycle formed in Early Cretaceous may be divided into four subcycles, and the volcanism is characterized by migration from west to east and evolution from basic through intermediate-basic to intermediate-acid which results in the formation of a series of volcanic structures of various grades. There are mainly 4 th-order～6 th-order volcanic structures in the area, which include volcanic structural depressions, stratified volcanoes, broken volcanoes, and dome-shaped volcanoes. The volcanic structures of various grades and different stages affected the formation, distribution and preservation of fossil-bearing beds in various degrees. The 3 rd-order volcanic structure controlled NE-trending expansion of the volcanic-sedimentary rocks of Yixian Formation, the 4 th-order structures formed two huge volcanic structural depressions with relatively independent sedimentary strata in them, and the 5 th～6 th-order structures directly affected the spatial form and material constituents of the fossil-bearing beds. |
| keywords:Yixian Formation volcanic structure Beipiao-Yixian area |
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