| 上扬子地区下三叠统飞仙关组一段:大灭绝后从停滞海洋到动荡海洋的沉积记录 |
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| 引用本文： | 时志强,伊海生,曾德勇,张华.上扬子地区下三叠统飞仙关组一段:大灭绝后从停滞海洋到动荡海洋的沉积记录[J].地质论评,2010,56(6):769-780. |
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| 作者姓名： | 时志强 伊海生 曾德勇 张华 |
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| 作者单位： | 成都理工大学沉积地质研究院,成都,610059 |
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| 基金项目： | 本文为国家自然科学基金资助项目（编号40872082，40972084）的成果。 |
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| 摘 要： | 在P—T界线生物大灭绝事件以后的早三叠世早期,上扬子地区广泛沉积了低能环境纹层状微晶灰岩、灰质页岩或条带状灰岩沉积,代表了P—T事件之后早三叠世最早期上扬子地区所处的古特提斯海海洋循环的近乎停滞;该套低能环境静水沉积广泛见于江油、广元、旺苍、重庆等地剖面中。上覆于停滞海洋沉积之上的是角砾状灰岩、扁平砾石灰岩、丘状交错层理颗粒灰岩、沙纹层理粉砂岩等和风暴作用有关的动荡海水沉积;低能环境沉积与动荡海水沉积之间常见冲刷、侵蚀界面,这都反映了上扬子地区从停滞海洋到动荡海洋的地质记录。川西北地区角砾状灰岩分布面积大、成因特殊,而扁平砾石灰岩是早三叠世典型的与风暴作用有关的错时相灰岩。沉积岩石显示的从静水条件到与风暴有关的动荡水条件的环境变化,预示着早三叠世早期生物大灭绝以后不同寻常的古海洋和古气候变化。P—T生物大灭绝可能对早三叠世早期古气候和大气循环起到了显著作用,P—T事件后生物对整个地球系统的调节作用减弱,地球系统向极端情况发展的趋势将得不到有效制约,全球古环境与古气候可能因此变得极端恶劣。
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| 关 键 词： | 早三叠世 飞仙关组一段 错时相 上扬子地区 沉积相演变 |
The Lowest Member of Lower Triassic Feixianguan Formation in Upper Yangtze Region: Sedimentary Records from Sluggish Water to Turbulent Ocean after the Mass Extinction |
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| SHI Zhiqiang,YI Haisheng,ZENG Deyong,ZHANG Hua.The Lowest Member of Lower Triassic Feixianguan Formation in Upper Yangtze Region: Sedimentary Records from Sluggish Water to Turbulent Ocean after the Mass Extinction[J].Geological Review,2010,56(6):769-780. |
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| Authors: | SHI Zhiqiang YI Haisheng ZENG Deyong ZHANG Hua |
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| Institution: | SHI Zhiqiang,YI Haisheng ZENG Deyong,ZHANG HuaInstitute of Sedimentary Geology,Chengdu University of Technology,Chengdu,610059 |
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| Abstract: | In upper Yangtze Region, laminated microcrystalline limestone, calcareous shale or ribbon limestone widely developed during the earliest stage of Early Triassic time, just after the Permian Triassic boundary (PTB) mass extinction, which represented the Sluggish oceanic circulation. As seen at the sections in Jiangyou, Guangyuan, Wangcang County, Sichuan Province and Chongqing Municipality, the storm-related sediments such as brecciform limestone, flat-pebble conglomerate calcirudyte, hummocky cross-bedding ... |
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| Keywords: | Early Triassic lowest member of Feixianguan Formation anachronistic facies upper Yangtze Region evolvement of sedimentary facies |
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