| 湖北恩施太阳河奥陶纪-志留纪之交沉积间断的研究 |
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| 引用本文： | 王怿,樊隽轩,张元动,徐洪河,M.J.Melchin.湖北恩施太阳河奥陶纪-志留纪之交沉积间断的研究[J].地层学杂志,2011(4):361-367. |
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| 作者姓名： | 王怿 樊隽轩 张元动 徐洪河 M.J.Melchin |
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| 作者单位： | 现代古生物学和地层学国家重点实验室中国科学院南京地质古生物研究所;Department of Earth Sciences,St.Francis Xavier University,Antigonish |
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| 基金项目： | 中国科学院知识创新工程方向性项目(No.KZCX2-EW-111,YW-Q05-01);国家自然科学基金(No.40772002)共同资助 |
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| 摘 要： | 依据湖北恩施太阳河灯草坪奥陶系—志留系剖面的生物地层学和岩石学的研究,该剖面的沉积间断发生在Paraorthograptus pacificus带至Coronograptus cyphus带之间,共缺失5个笔石带。奥陶系、志留系之间黏土岩矿物分析显示,在奥陶系、志留系之间出现有高岭土,推断在其间可能上升为陆地。具体演变...
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| 关 键 词： | 生物地层 岩石地层 笔石 沉积间断 奥陶系 志留系 恩施 湖北 |
ON THE ORDOVICIAN-SILURIAN DEPOSITIONAL HIATUS AT TAIYANGHE,ENSHI,HUBEI PROVINCE |
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| Institution: | WANG Yi1),FAN Jun-Xuan1),ZHANG Yuan-Dong1),XU Hong-He1)and Michael J.MELCHIN2)1) State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008;2) Department of Earth Sciences,St.Francis Xavier University,Antigonish,NS B2G 2W5,Canada |
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| Abstract: | A depositional hiatus of five graptolite zones,between the Paraorthograptus pacificus Biozone and the Coronograptus cyphus Biozone,is recognized based on biostratigraphical and lithological evidence at the Dengcaoping Ordovician-Silurian Section,Taiyanghe,Enshi,Hubei Province.The abundance of kaolinitein the claystones between the Ordovician and the Silurian rocks implies that the study area had probably emerged above the sea level during the depositional hiatus.The geological processes befire and after this hiatus can be described as four steps: 1) before the P.pacificus Chron this area was submerged in anoxic or dysoxic sea waters,resulting in deposition of graptolite-bearing black shales;2) In the P.pacificus Chron(or earlier) uplift began,as a result,this area became a submarine highland where subaqueous erosion occurreed,both the bioturbation and sedimentary features in the shales indicate a moderate energy environment at this time;3) from the latest Ordovician to Aeronian this area continued to rise and probably became subaerially emerged;4) before or at the C.cyphus Chron,a rapid subsidence of this area resulted in a return to relatively deep marine conditions and deposition of the Lungmachi graptolite-bearing black shales.The sea level fall in this area is thought to be a related to the late Katian-early Hirnantian global regression and the continuous west to northwestward expansion of the Cathaysian Land.Further field work in the entire Yangtze platform will help to establish a more comprehensive depositional model during the Ordovician-Silurian transition. |
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| Keywords: | biostratigraphy lithostratigraphy depositional hiatus graptolites Ordovician Silurian Enshi Hubei |
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