| 湖北赤壁二叠纪一三叠纪之交古海洋沉积环境演化 |
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| 引用本文： | 邓宝柱,余黎雪,王永标,李国山,孟亚飞.湖北赤壁二叠纪一三叠纪之交古海洋沉积环境演化[J].地球科学,2015,40(2):317-326. |
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| 作者姓名： | 邓宝柱 余黎雪 王永标 李国山 孟亚飞 |
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| 作者单位： | 中国地质大学地球科学学院,湖北武汉430074 2.中国地质大学地质过程与矿产资源国家重点实验室,湖北武汉430074 3.中国地质大学资源学院,湖北武汉430074 |
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| 基金项目： | 国家重点基础研究发展计划(No.2011CB808800)国家自然科学基金(No.41172036)中国地质大学(武汉)中央高校基本科研业务 费专项(No.1410491A03) |
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| 摘 要： | 晚二叠世时,湖北赤壁位于扬子台地与北部硅质岩盆地的过渡地带.特殊的古地理位置,使该地区发育一套独特的地层
沉积序列.沉积微相、古生物化石和草莓状黄铁矿的综合研究表明,晚二叠世长兴期至早三叠世早期,赤壁剖面沉积环境演化
可分为6个阶段:近氧化的深水台缘硅质岩沉积、含氧量正常的台缘缓坡沉积、火山活动加剧而含氧量正常的台缘缓坡沉积、
大灭绝后严重缺氧环境的沉积、大灭绝后贫氧环境下的沉积、大灭绝后氧化环境的沉积.由于赤壁剖面处在远离陆地的台缘缓
坡环境,陆源剥蚀的影响可能比较有限,因此火山作用带来的营养物质可能是引起大灭绝后海洋缺氧的主要原因.
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| 关 键 词： | 湖北赤壁 二叠纪-三叠纪之交 古海洋环境 草莓状黄铁矿 沉积岩 地层学. |
Evolution of Marine Conditions and Sedimentation during the Permian-Triassic Transition in Chibi of Hubei Province |
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| Deng Baozhu,Yu Lixue,Wang Yongbiao,Li Guoshan,Meng Yafei.Evolution of Marine Conditions and Sedimentation during the Permian-Triassic Transition in Chibi of Hubei Province[J].Earth Science-Journal of China University of Geosciences,2015,40(2):317-326. |
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| Authors: | Deng Baozhu Yu Lixue Wang Yongbiao Li Guoshan Meng Yafei |
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| Abstract: | The Chibi section of Hubei Province was1ocated in the transitiona1 zone between the Yangtze Platform and the northern deep
silicious basin during Late Permian and its specia1 paleogeographic settingled to the formation of a unique sedimentary sequence within
the PermoTriassic interva1. Base on a comprehensive study of microfacies, fossils and pyrite framboids it is found that the evolution of
the sedimentary environment of Chibi section can be divided into6 stages during the Later Permian Changhsingian to early stage of Ear-
1y Triassic Period, which are nearly oxidized deepwater platform margin siliceous sedimentary, normoxic gentle s1ope platform margin
sedimentary, volcanic activity intensified and normoxic platform margin gentle s1ope deposition, severe anoxic sedimentary environ-
ment, oxygen-depleted sedimentary environment and oxidizing environment of deposition after the mass extinction. The Chibi section
was1ocated in the gentle s1ope environment platform margin away from theland withlimited impact fromland-erosion, so nutrients
from volcanism may be the main reason to cause marine anoxia aftermath the mass extinction. |
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| Keywords: | Chibi section of Hubei Province Permian-Triassic paleoceanography environment pyrite framboid sedimentary rocks stratigraphy |
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