Origin, transportation and emplacement of Permian and Triassic exotic limestone blocks based on faunal analysis of foraminifers

日本二叠纪至早白垩世增生杂岩中的石灰岩块体发育了多种二叠纪和三叠纪有孔虫，这对泛海山的板块运动以及东亚古生代至中生代的构造和古生物地理都提供了限制。本研究项目旨在了解日本各增生地体中最适合研究环太平洋地区古生代和中生代有孔虫时空分布的封闭和代表性石灰岩块体的产状、岩性和化石组合，并为本研究提供有用的地质资料。阐明了这些石灰岩块体中有孔虫的生物地层分布、区系组成和分类多样性与石灰岩岩性的关系。本研究项目通过对有孔虫的系统发育关系、时间和空间分布、诊断种的相似程度和区系组成等方面的详细考察，对晚古生代有孔虫的古生物地理、灰岩和含灰岩地层的沉积位置、沉积后构造改造等进行了探讨和揭示，并在本研究项目的基础上补充了许多未发表的资料和文献调查的结果。需要更多的时间和信息来引导最终结论，以解释这个项目的目的，重点是这些异国情调的石灰石块的起源，运输和安置。三年来，积极推进本课题的研究工作，获得了与本课题密切相关的论文18篇，新资料多行。本课题是我关于晚古生代和中生代有孔虫进化与古生物地理学系列工作的延伸和进一步发展。

Limestone blocks contained in the Permian to Early Cretaceous accretionary complexes of Japan yield various kinds of Permian and Triassic foraminifers that provide restrictions considering the plate movement of the Panthalassan-originated seamounts, and tectonics and paleobiogeography of Paleozoic to Mesozoic in East Asia. This research program was performed to understand the field occurrences, lithologic properties, and fossil assemblages in confined and representative limestone blocks of each of the accretionary terranes of Japan that are most suitable for studying time- and space-distribution of Paleozoic and Mesozoic foraminifers in the Circum-Pacific regions and also have useful geologic data for the present study. Biostratigraphic distribution, faunal composition, and taxonomic diversity of foraminifers in relation to limestone lithologies were clarified in many of these limestone blocks. This research program discussed and revealed on paleobiogeography of Late Paleozoic foraminifers, depositional site of limestone and limestone-bearing strata, and post-depositional tectonic modification based on the careful examination of phylogenetic relationships, time- and space-distribution, degree of similarities of diagnostic species and faunal composition of these foraminifers, adding results of many unpublished data and literature survey to those obtained in this research program. Further time and information are necessary to lead the final conclusion to explain the aim of this program that is focused on the origin, transportation and emplacement of these exotic limestone blocks. Eighteen papers and many lines of new information deeply related to the aim of this program were obtained in these three years as the results of active promotion of this research program that was placed as the extension and further development of my serial work concerning evolution and paleobiogeography of Late Paleozoic and Mesozoic foraminifers.