| 四合屯-义县地区义县组火山活动的旋回性特征 |
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| 引用本文： | 邢德和,陈树旺,张立东,郭胜哲,张长捷,彭艳东,贾斌,丁秋红,郑月娟.四合屯-义县地区义县组火山活动的旋回性特征[J].地质与资源,2003,12(4):193-200,214. |
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| 作者姓名： | 邢德和 陈树旺 张立东 郭胜哲 张长捷 彭艳东 贾斌 丁秋红 郑月娟 |
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| 作者单位： | 1. 吉林大学 地球科学学院, 吉林长春 130061;2. 沈阳地质矿产研究所, 辽宁 沈阳 110033;2. 东北大学 资源与土木工程学院, 辽宁 沈阳 110004 |
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| 基金项目： | 中国地质调查局项目“北票、上园、义县、地藏寺等四幅1∶5万区域地质调查”(编号J4.1.12)的工作成果. |
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| 摘 要： | 在岩石学特征分析的基础上,结合本区广为发育的火山间歇期沉凝灰岩、凝灰质粉砂岩以及其中的古生物化石特征等,作者将四合屯-义县地区义县组火山活动分为早、中、晚3个火山活动旋回,即早期以玄武岩、玄武安山质火山岩类为主的基性、中基性旋回;中期以流纹质及英安质火山岩类为主的中酸性旋回;晚期以玄武岩为主的基性旋回.义县组火山活动早期的基性、中基性旋回还可进一步分为4个亚旋回,在其中的沉凝灰岩中发育有以鹦鹉嘴龙为主的古脊椎动物化石.各旋回或亚旋回的底部不同程度地发育有爆发-沉积相的沉凝灰岩或内陆湖泊相沉积岩.包括珍稀动植物在内的热河生物群化石则产于义县组火山活动中期的沉凝灰岩以及钙质页岩之中.
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| 关 键 词： | 旋回性特征 火山活动 义县组 |
| 文章编号： | 1671-1947(2003)04-0193-09 |
| 收稿时间： | 2003-06-19 |
THE CYCLICITY OF VOLCANIC ACTIVITIESOF YIXIAN FORMATION IN SIHETUN YIXIAN AREA,LIAONING PROVINCE |
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| XING De he,CHEN Shu wang,ZHANG Li dong,GUO Sheng zhe,ZHANG Chang jie,PENG Yan dong,JIA Bin,DING Qiu hong,ZHENG Yue juan.THE CYCLICITY OF VOLCANIC ACTIVITIESOF YIXIAN FORMATION IN SIHETUN YIXIAN AREA,LIAONING PROVINCE[J].Geology and Resources,2003,12(4):193-200,214. |
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| Authors: | XING De he CHEN Shu wang ZHANG Li dong GUO Sheng zhe ZHANG Chang jie PENG Yan dong JIA Bin DING Qiu hong ZHENG Yue juan |
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| Institution: | 1. Institute of Earth Sciences, Jilin University, Changchun 130061, China;2. Shenyang Institute of Geology and Mineral Resources, Shenyang 110033, China;3. Institute of Resources and Civil Engineering, Northeast University, Shenyang 110004, China |
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| Abstract: | Based on the analysis of petrology and occurrence of tuffite and fossils within it,the volcanic activities of Yixian formation are divided into three cycles.The early stage is a basic and intermediate basic cycle that is of mainly basaltic or basaltic andesitic volcanic rocks.The middle stage is an acid intermediate cycle dominated by rhyolitic or dacitic volcanic rocks.The last stage is a basaltic cycle with mainly basaltic or trachytoid rocks.The early stage could be subdivided into four subcycles.And for the first time,we have discovered planty of paleo vertebrate fossils (mainly of Psittacosaurus)in the tuffite of the early stage(basic and intermediate basic cycle).The tuffites of explosive sedimentary phase or inland lake phase always occur at the bottoms of each cycle or subcycle.“Jehe Biota”fossils,including precious birds,occur in the tuffites and calcareous shale beds of the middle stage(intermediate acidic cycle).The division of volcanic activity cycles of Yixina formation is of most significant to realize the volcanic sedimentary action and the relationship between creature hazard and volcanic actions. |
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| Keywords: | cyclicity volcanic activity Yixian formation |
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