| 论扬子地区上奥陶统五峰组观音桥段的深海成因 |
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| 引用本文： | 徐论勋,肖传桃,龚文平,何幼斌.论扬子地区上奥陶统五峰组观音桥段的深海成因[J].地质学报,2004,78(6):726-732. |
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| 作者姓名： | 徐论勋 肖传桃 龚文平 何幼斌 |
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| 作者单位： | 长江大学地球科学学院,湖北,荆州,434023 |
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| 基金项目： | 国家自然科学基金 (编号 40 2 72 0 60 )资助的成果 |
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| 摘 要： | 通过对沉积速率与现代深海沉积速率的比较及古生态学、生物古地理学、海平面变化以及沉积特征综合的分析 ,认为观音桥段形成于深海环境中 ,且属深海等深流沉积。奥陶 -志留系之交广泛发生的高频火山事件可能是生物灭绝的主要和直接原因 ,而火山事件、铱和碳同位素异常事件与志留纪初期缺氧事件在奥陶 -志留系之交的耦合作用可能是 H irnantia- Dalmanitina动物群的灭绝的主要原因。
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| 关 键 词： | 观音桥段 深海沉积 生物灭绝 地质事件 扬子地区 |
| 修稿时间： | 2004年3月19日 |
A Study on the Deep-sea Sediment of the Guanyinqiao Memberof the Upper Ordovician Wufeng Formation in the Yangtze Area |
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| XU Lunxun,XIAO Chuantao,GONG Wenping,HE Youbi Geosciences College of Yangtze University,Jingzhou,Hubei.A Study on the Deep-sea Sediment of the Guanyinqiao Memberof the Upper Ordovician Wufeng Formation in the Yangtze Area[J].Acta Geologica Sinica,2004,78(6):726-732. |
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| Authors: | XU Lunxun XIAO Chuantao GONG Wenping HE Youbi Geosciences College of Yangtze University Jingzhou Hubei |
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| Abstract: | Through a comparison of sedimentation rates between the Guanyinqiao Member and modern deep-sea deposits and analyses of paleoecology, paleobiogeography, sea-level changes and comprehensive geological characteristics of the Guanyinqiao Member, the authors hold that the Guanyinqiao Member was formed in a deep-sea environment and should belong to the deep-sea contourites. In addition, the authors suggest that the extensive volcanic events frequently occurred at the turn of Ordovician-Silurian may be the main and direct cause for organism extinction and that the coupling of volcanic events, iridium and carbon isotopic abnormality events and the anoxic event in the early stage of the Silurian at that time may be the main cause for the extinction of the Hirnantia-Dalmanitina fauna. |
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| Keywords: | Guanyinqiao Member Deep-sea sedimentation organism extinction geological event Yangtze area |
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