| 四合屯及其周边地区义县组火山活动对生物灾难事件的影响 |
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| 引用本文： | 陈树旺,张立东,郭胜哲,张长捷,彭艳东,贾斌,邢得和,丁秋红,郑月娟.四合屯及其周边地区义县组火山活动对生物灾难事件的影响[J].地学前缘,2002,9(3):103-107. |
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| 作者姓名： | 陈树旺 张立东 郭胜哲 张长捷 彭艳东 贾斌 邢得和 丁秋红 郑月娟 |
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| 作者单位： | 中国地质调查局,沈阳地质矿产研究所,辽宁,沈阳,110032 |
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| 基金项目： | 中国地质调查局项目 (J4.1.12 ) |
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| 摘 要： | 野外填图证实 ,四合屯及其周边地区热河生物群化石主要产于义县组下部的沉凝灰岩和中部的内陆湖泊相沉积岩之中。综合研究还发现 ,上述化石层之中发育有火山弹、湖泊相枕状熔岩以及数层火山碎屑和火山灰物质 ;在产有珍稀鸟类、爬行类以及早期被子植物化石的岩石中 ,As,Hg ,S的含量明显高于相关的对比层。种种迹象表明 ,四合屯及其周边地区的义县组火山活动所产生的熔岩流和有毒、有害气体以及频繁爆发的火山灰等是造成热河生物群灾难事件并使其得以保存的主要因素
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| 关 键 词： | 火山活动 生物灾难事件 义县组 |
| 文章编号： | 1005-2321(2002)03-0103-05 |
| 修稿时间： | 2002年5月24日 |
EFFECTS OF VOLCANIC ACTIVITY ON THE BIOLOGICAL CATASTROPHIC EVENT OF YIXIAN FORMATION IN SIHETUN AND ADJACENT AREA |
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| CHEN Shu wang,ZHANG Li dong,GUO Sheng zhe,ZHANG Chang jie,PENG Yan dong,JIA Bin,XING De he,DING Qiu hong,ZHENG Yue juan.EFFECTS OF VOLCANIC ACTIVITY ON THE BIOLOGICAL CATASTROPHIC EVENT OF YIXIAN FORMATION IN SIHETUN AND ADJACENT AREA[J].Earth Science Frontiers,2002,9(3):103-107. |
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| Authors: | CHEN Shu wang ZHANG Li dong GUO Sheng zhe ZHANG Chang jie PENG Yan dong JIA Bin XING De he DING Qiu hong ZHENG Yue juan |
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| Abstract: | Based on the field mapping, we recognized that "Jehol Biota" fossils occurred mainly in tuffite of the lower part and inner lake sedimentary beds of the middle part of Yixian F. in Sihetun and the adjacent area. Comprehensive study also shows that there are volcanic bomb, pillow lava, tephra and volcanic ash developed in the fossil beds. The rocks of fossil rich sedimentary beds (containing precious birds, reptiles and early angiosperms) abounded with more toxic elements such as As, Hg and S than the other beds. All evidences indicate that the lava flow, tephra, ash and toxic gases of the volcanic activities are the main factors that caused the biological hazard and the fossil preservation of "Jehol Biota" in Sihetun and the adjacent area. |
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| Keywords: | volcanic activity biological catastrophic event Yixian Formation |
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