| 中扬子台地及其南缘早奥陶世道保湾期生态地层 |
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| 引用本文： | 肖传桃,朱忠德,胡明毅,李相明.中扬子台地及其南缘早奥陶世道保湾期生态地层[J].沉积与特提斯地质,1997,17(2):53-57. |
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| 作者姓名： | 肖传桃 朱忠德 胡明毅 李相明 |
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| 作者单位： | 江汉石油学院地质系!湖北荆沙 |
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| 摘 要： | 通过对中扬子台地及其南缘早奥陶世道保湾期生态地层的研究，划分出了7个生态相域，即：Batostoma-Calathium群落台地生物礁生态相域、Calathium-Archaeoscyphia群落台地生物礁生态相域、Sinorthis群落内陆棚生态相域、Cameroceras群落中一外陆棚生态相域、Endoceras群落深水斜坡生态相域、Tatragraptus群落盆地边缘生态相域、Didymograptus群落深水盆地生态相域。根据生态相域的组合特征，建立了4个生态相区和1个生态相体系。生态地层研究的结果揭示了中扬子台地及其南缘道保湾期的生态特征、古生物地理和古构造及沉积古地理等特征。
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| 关 键 词： | 群落 生态相 奥陶纪 中扬子台地 华南古大陆边缘 |
ECOSTRATIGRAPHY OF THE MIDDLE YANGTZE PLATFORM AND ITS SOUTHERN MARGIN DURING THE DAOBAOWANIAN (EARLY ORDOVICIAN) |
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| Xiao Chuantao,Zhu Zhongde,Hu Mingyi,Li Xingming.ECOSTRATIGRAPHY OF THE MIDDLE YANGTZE PLATFORM AND ITS SOUTHERN MARGIN DURING THE DAOBAOWANIAN (EARLY ORDOVICIAN)[J].Sedimentary Geology and Tethyan Geology,1997,17(2):53-57. |
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| Authors: | Xiao Chuantao Zhu Zhongde Hu Mingyi Li Xingming |
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| Institution: | Jnipghan College of Petroleum |
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| Abstract: | Seven ecostratigraphic facies tracts (EFT) have been distinguished. for the Daobaowa-nian ecostratigraphy of the Middle Yangtze platform and its southern margin. They are:(1)Batostoma-Calathium platform organic reef ecostratigraphic facies tract, characterizedby benthic reef-building communities ; (2)Calathium-Archaeoscyphia platform organic reefecostratigraphic facies tract ; (3)Sinorthis inner shelf ecostratigraphic facies tract ; (4 )Came-roceras mid-outer shelf ecostratigraphic facies tract characterized by nektonic organisms;(5)Endoceras deep-water slope ecostratigraphic facies tract also characterized by nektonicorganisms ; (6) Teragraptus basin-margin ecostratigraphic facies tract characterized byplanktonic organisms, and (7) Didymograptus deep-sea basin ecostratigaphic facies tractcharacterized by planktonic organisms as well. According to the assemblages of ecostrati-graphic facies tracts ; four ecostratigraphic facies regions have also been estahlished. (1)Batostoma-Calathium and Calathium-Archaeoscyphia platform organic reef ecostratigraphicfacies region ; (2 )Sinorthis and Cameroceras shelf ecostratigraphic facies region dominatedby benthic and nektonic organisms ; (3)Endoceras deep-water slope ecostratigraphic faciesregion including the transitional-type organisms,and (4) Teragraptus and Didymograptusdeep-water basin ecostratigraphic facies region composed of the Jiangnan-type organisms,all of which are arranged into one ecostratigraphic facies system,i. e- BCA,SC,E and TDplatform-shelf-slope-basin ecostratigraphic facies system,The results of research on ecos-tratigraphy in this paper have disclosed the ecological,palaeobiogeographic,tectono-palaeo-geographic,sedimentary facies and palaeogeographic characteristics of the study area dur-ing the Daobaowanian (Early Ordovician ). |
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| Keywords: | community ecostratigraphic facies Ordovician Middle Yangtze platform margins of South China oldland |
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