| 康滇古陆东侧早奥陶世遗迹化且合及其指相意义 |
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| 引用本文： | 沈志达,曾羽.康滇古陆东侧早奥陶世遗迹化且合及其指相意义[J].沉积学报,1990,8(3):110-120. |
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| 作者姓名： | 沈志达 曾羽 |
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| 作者单位： | 1.贵州省地质矿产局; |
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| 摘 要： | 康滇古陆东侧的下奥陶统,发育有一套碎屑岩相岩石组合,遗迹化石丰富,其组合与沉积相的关系密切,起到了极好的指相佐证。遗迹化石组合有三个特点:1、Cruziana产出层位由西向东升高,具穿时性,越过了整个早奥陶世;2、Cruziana分布较广,而Skolithos较局限;3、Cruziana与Skolithos在时间上交替出现,而在贵州赫章县则只有Skolithos相。
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| 关 键 词： | 早奥陶世 遗迹化石 指相 康滇古陆东侧 |
| 收稿时间： | 1988-04-27 |
THE TRACE FOSSIL ASSOCIATIONS OF EARLYORDOVICIAN IN THE EASTERN SIDE OF KANGDIANOLDLAND AND THEIR FACIES-INDICATING SIGNIFICANCE |
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| Institution: | 1.Guizhou Bureau of Geology and Minerals;2.Postgraduates of the Geology Department of Guizhou Engineering Institute |
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| Abstract: | A clastic rock association is developed in Lower Ordovician in the eastern side ofKangdian oldland, with trace fossils very abundant.The relation between trace fossil associa-tions and sedimentary facies is the central topic to be dealt with in this paper. Thirteen tracefossils are described in the paper, among which there are six new ichnosp.Cruziana regularianov. ichnosp.，C. dimorphiconis nov. ichnosp.，Dimorphichnus ebianensis nov. ichnosp.，D.reticularis nov.ichnosp., Cvlindricum ovatus nov.ichnosn., etc. According to our researches, the area of trace fossils can be divided into the easternpart and the wastern part by a line from Weiyuan, through Yiliang, to Xuanwei. In littoralzone of the western, the trace fossils of Scoyenia, Skolithos and Gruziana occuredalternately, which indicate that the water body of the littoral environment was shallower,and the sea level changed violently(the cyclic change of the supratidal, intertidal andsubtidal) to Meitan age. In the eastern part, such as Guiyang, Hezhang, the trace fossilswere mainly occured in the Meitan age. The abundant trace fossils of Skolithos were occuredin the prolittoral fades of the sedimentary sequence of the sandy progradationad shore in ear-1y Meitan age; the abundant trace fossils of Cruziana were occured in the sandstone and theshale occurring in the Limestone of late Meitan age in Guiyang, which indicate a subtitalmid and high-energy littoral environment, that is to say a linear sandy ridge controlled bytidal current. As a result that the trace fossils associations formed and influenced by the changes oftime and space of water body envisoument，it has the important facios-indicating signifi-cance. |
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