华南宾夕法尼亚亚系高精度牙形刺生物地层序列及全球对比

Global tectonics combined with Gondwanan glaciation confounds the subdivision of Pennsylvanian of Carboniferous and also complicates global correlations. Four Carboniferous stages, including the Serpukhovian of Mississippian, the Moscovian, Kasimovian and the Gzhelian of Pennsylvanian still do not have Global Stratotype Sections and Points (GSSPs). Although some research progress on the study of the above GSSPs have been made by some task group members in recent years, the boundary markers, the related conodont lineages and their global correlations are not very clear yet. In addition, conodonts within each stage are relatively less studied, and their conodont zonations are of low-resolution. Therefore, this project will focus on the establishment of a high-resolution Pennsylvanian conodont biostratigraphic succession in South China based on the further detailed study of conodonts from the Naqing section, Narao section, Fengting section and the Luokun section in Luodian and the Dianzishang section in Zhenning of Guizhou, their taxonomy, their evolutionary lineages and their global correlations. The new conodont succession could be a global standard succession for the subdivision and correlation of Pennsylvanian in the world, because it will be based on the conodonts from the successive Carboniferous limestones in several sections of South China. Moreover, the South China sections will benefit from this project for the competition on the GSSPs of the Moscovian, Kasimovian and the Gzhelian stages.

密西西比亚纪晚期开始的全球大规模构造运动和冈瓦纳大陆冰川的发育，为石炭系地层划分和对比带来了困难。目前为止，国际地层表中石炭系内部仍有4个阶的全球层型（GSSPs）没有确立,它们分别是密西西比亚系的谢尔普霍夫阶和宾夕法尼亚亚系的莫斯科阶、卡西莫夫阶和格舍尔阶。尽管近年来各界线工作组都取得了一些新的研究进展，但界线层的牙形刺演化谱系、界线标志、全球对比等方面仍存在问题，加之各阶内部的牙形刺研究相对薄弱，建带精度不高。本项目旨在利用华南发育连续的石炭系碳酸盐地层的独特优势，通过对贵州罗甸纳庆剖面、纳饶剖面、逢亭剖面、罗悃剖面和镇宁店子上剖面牙形刺分类、演化和全球对比等的深入研究，建立华南宾夕法尼亚亚系高精度的牙形刺生物地层序列，力争使其成为全球宾夕法尼亚亚系划分对比的标准，同时为我国争得莫斯科阶、卡西莫夫阶和格舍尔阶的GSSPs（"金钉子"）作出贡献。

密西西比亚纪晚期开始的全球大规模构造运动和冈瓦纳大陆冰川的发育，为石炭系地层划分和对比带来了困难。目前为止，国际地层表中石炭系内部仍有4个阶的全球层型（GSSPs）没有确立,它们分别是密西西比亚系的谢尔普霍夫阶和宾夕法尼亚亚系的莫斯科阶、卡西莫夫阶和格舍尔阶。尽管近年来各界线工作组都取得了一些新的研究进展，但界线层的牙形刺演化谱系、界线标志、全球对比等方面仍存在问题，加之各阶内部的牙形刺研究相对薄弱，建带精度不高。本项目利用华南发育连续的石炭系碳酸盐地层的独特优势，通过对贵州罗甸纳庆剖面、纳饶剖面、逢亭剖面、罗悃剖面和镇宁店子上剖面牙形刺分类、演化和全球对比等的深入研究，建立并完善了华南宾夕法尼亚亚系高精度的牙形刺生物地层序列，并发表了一系列论文。华南宾夕法尼亚亚系的牙形刺序列有望成为全球宾夕法尼亚亚系划分对比的标准。这些成果的取得将为我国争得谢尔普霍夫阶、莫斯科阶、卡西莫夫阶和格舍尔阶的GSSPs（“金钉子”）作出重要贡献。