Foraminiferal fauna and limestone lithology of the Upper Permian, and paleogeographic and tectonic implications

本研究旨在通过对晚二叠世石灰岩岩性、发育史、时空分布、古生物学特征的研究，探讨晚二叠世有孔虫古生物地理及其构造意义，包括石灰岩块体地质单元的起源、漂移和侵位，晚二叠世有孔虫的特征分类群和区系组成在许多地区进行了一系列的野外调查，为开展这项研究项目，准备了石灰岩和许多石灰岩薄片。本课题研究了秋吉地体上二叠统常盛组和上三叠统不整合覆盖的原组的灰岩岩性和灰岩块、碎屑中有孔虫动物群。的 关于我们 y表明，“泷口石灰岩”或“泷口组”根据高千穗地区上二叠统三台群有孔虫生物地层学和动物群的研究结果，将原组上部划分为长兴阶，而不是原组上部划分为吴家坪阶想的赤坂灰岩的顶部也可采用武家坪阶的年龄。根据野外观察和京都舞鹤地体中含Lubiolina的灰岩砾岩和含Colaniella-Nanlingella的灰岩的外来岩块之间的有孔虫动物群分析，舞鹤群被证明是一个较深的斜坡存款，而不像小林（2003）所认为的那样显示出任何地层关系。根据以往积累和新获得的资料，发表了3篇关于兵库县舞鹤群有孔虫动物群的论文。关于兵库县自然与人类活动博物馆保存的由古生代和中生代石灰岩薄切片组成的带有孔虫标本集，该标本集的模式标本已编制成一个数据库，其中包括登记编号，种、类型、分类、岩石单位、时代、产地、参考文献和显微照片。少

The purpose of this study is to discuss collectively the Late Permian paleobiogeography of foraminifers and tectonic implications including the origin, drift, and emplacement of the geologic unit with limestone blocks, based on the examination of limestone lithology and phylogeny, time-space distribution, characteristic taxa and faunal composition of Late Permian foraminifers among areas as well as terranes A serial field survey has been performed in many limestones and many limestone thin sections have been prepared to carry out this research project. Although most of results obtained in the term of this, research project have not been published, some important results have been accumulated available for further study.Limestone lithology and foraminiferal fauna of limestone blocks and clasts were examined in detail in the Tsunemori Formation (Upper Permian accretionary complex in the Akiyoshi Terrane) and unconformably overlying Hirabaru Formation of the Upper Triassic Mine Group. The … More y show that the "Takiguchi Limestone" or the "Takiguchi Formation" formerly thought to be the basal conglomerate of the Hirabaru Formation is more reasonably included into the Tsunemori Group separating from the Mine Group.The results of foraminiferal biostratigraphy and faunas of the Upper Permian Mitai Group in the Takachiho area reveal that the upper part of the formation is assignable to the Changhsingian and not to the Wuchiapingian as previously thought. The Wuchiapingian age assignment is also applicable to the top of the Akasaka Limestone.From the field observation and foraminiferal faunal analysis between exotic blocks of the limestone conglomerate with Lepidolina and he limestone having Colaniella-Nanlingella in the Maizuru Terrane of the Kyoto Prefecture, the Maizuru Group is proved to be a deeper slope deposit without showing any stratigraphic relation as considered by Kobayashi (2003). Three papers of foraminiferal faunas of the Maizuru Group in the Hyogo Prefecture were published on the basis of the data previously accumulated and newly obtained.Concerning the FUMIO KOBAYASHI COLLECTION consisting of Paleozoic and Mesozoic limestone thin sections with foraminifers kept in the Museum of Nature and Human Activities of Hyogo, the type specimens of the collection have compiled as a database with basic information such as registered number, species, type, taxonomy, rock unit, age, locality, reference, and photomicrograph. Less