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甘肃礼县石炭系地层古生物研究
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摘要
在对西秦岭石炭纪地层和古生物化石资料进行广泛的野外收集和室内分析处理的基础上,对研究区石炭系进行了系统的岩石地层和生物地层学的划分和对比;对所获古生物化石进行了系统的描述和归属讨论,形成了一套内容丰富的西秦岭石炭纪地层古生物研究新资料。
     1.岩石地层学研究
     通过对研究区7条剖面的测制和研究,依据地层的发育、分布特征和岩性、岩相特征,进行了地层划分和对比;在岩石地层单元的划分中,对前人在该区的划分方案进行了清理和细分。从武山杨河—礼县固城一带(北带)新解体出下石炭统地层,并建议采用巴都组这一名称;对礼县鲁班石地区(南带)上石炭统地层建议采用下加岭组、东扎口组等名称。同时对所划的各组、段的特征、含义进行了详细描述,最后依据岩性岩相特征、地层接触关系等,进行了区域对比,建立了该区石炭系的岩石地层格架。
     2.生物地层研究
     综合各剖面上获得的古生物资料,按牙形刺、珊瑚和有孔虫化石等三大类论述了它们的特征、分布和组合特点,进而在鲁班石地区划分建立了牙形刺生物化石组合带。最后进行了各类化石的综合对比研究。
     南带牙形刺化石丰富且大多为典型的建带分子,而且从化石的产出状况表明牙形刺的演化趋势明显,通过深入研究本文建立了3个生物组合带,并在1、2组合带中分别建立了2个亚组合,具体为:
     3.Streptognathodus suberectus-S. expansus-S. parvus-S. gracilis组合带
     2.Idiognathodus delicatus- Idiognathodus shanxiensis- Neognathodus bassleri-Neogondolella clarki组合带
     Idiognathodus shanxiensis- Neognathodus bassleri-Neogondolella clarki亚组合
     Idiognathodus delicatus- Idiognathodus sinuosus亚组合
     1.Declinognathodus noduliferus noduliferus- Idiognathoides sinuatus- Polygnathodella ouachitensis组合带
     Idiognathoides sulcatus- I. sinuatus- I. corrugnatus-Polygnathodella ouachitensis亚组合
     Declinognathodus noduliferus noduliferus亚组合
     3.化石描述
     本文主要对产自北带(杨河—固城地区)和南带(鲁班石地区)古生物化石进行了系统的鉴定、描述和讨论,共鉴定有牙形刺25属47种,蜓类4属6种,珊瑚5属5种和一些非蜒有孔虫。
     4.生物地层分区
     本文通过对牙形刺、蜒类、珊瑚等化石的对比研究,发现研究区的生物群特征与华南区生物群相近,这表明在该区早、晚石炭世与华南区及东古特提斯区同属一个生物地理区系。
On the basis of extensive field investigations and laboratory analyses on the Carboniferous strata and fossils in the West Qinling . To the Carboniferous of Lixian , there has systematically been studied in the lithostratigraphy and biostratigraphy. At the same time, a diverse of fossils form this area have detailedly been described and discussed. Thus, it is a significant new contribution on stratigraphy and palaeontology of Carboniferous in Lixian of the West Qinling.
    Ch.1 Lithostratigraphy
    7 stratigraphical sections of the Carboniferous has been described Based on the features of development, distribution, petrology and facies of strata, the Carboniferous in this area can be further subdivided into secondary stratigraphical regions. I reconsider the disjoint strata of the early Carboniferous should adopt Badu Formation in Yanghe-Gucheng, the strata of the late Carboniferous should adopt Xijialing Formation and Dongzhakou Formation in Lubanshi. I also define each unite of formation and members. including characters of petrology and regional distribution. Finally, the stratigraphical framework have been constructed based on consistencies of petrology , facies and the relationships of rock units.
    Ch.2 Biostratigraphy
    Features, distribution and assemblage of three group fossils from many of the 7 geological setions, including conodont, coral and foraminifera fossils, have been comprehensively discussed. And a series of fossil assemblages can be recognized. Finally, integrative correlation has been made.
    The fossil assemblages and Suassemblages:
    3. Streptognathodus suberectus- S. expansus-S. parvus- S. gracilis Assemblage
    2. Idiognathodus delicatus- Idiognathodus shanxiensis- Neognathodus
    bassleri-Neogondolella clarki Assemblage
    Idiognathodus shanxiensis- Neognathodus bassleri-Neogondolella clarki Subassemblage
    Idiognathodus delicatus- Idiognathodus sinuosus Subassemblage
    2. Declinognathodus noduliferus noduliferus- Idiognathoides sinuatus-
    Polygnathodella ouachitensis Assemblage
    Idiognathoides sulcatus- I. sinuatus- I. corrugnatus-Polygnathodella ouachitensis Subassemblage Declinognathodus noduliferus noduliferus Subassemblage
    Ch.3 Description of fossils
    Fossils discovered from many localities in research area are systematically described. There are 25 genera and 47 species of conodont, 4 genera and 6 species of coral and some foraminifera.
    Ch.4 Biostratigraphical regions
    Based on the study on the conodont, coral and foraminifera fossils in research area, it was discovered that the biota features are resemble to the South China. So a conclusion can be drawn that the research area and South China belong to the same biogeographical region.
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