Collaborative Research: Spreading Ridge-Trench Interaction Recorded in an Accretionary Prism: The Tertiary Shimanto Belt, Southern Japan

增生棱镜是其中一个主要组成部分， 汇聚板块造山带，形成了 覆盖地壳板块。 四万十增生杂岩 日本西南部最近接受了一项研究， 暴露良好，因此详细的构造和地层 关系可以调查。 这项研究的结果 揭示了这个增生棱镜的部分是典型的 在会聚的板块边缘简单的增生。 结构性 异常包括180度的结构极性反转， 始新世和中新世增生包与晚期斜山 弯曲这一更新将测试假设，这些 异常是由于中新世的扩张脊 俯冲，通过计算机建模和进一步分析的程序 现有的数据。 预计结果将澄清 Shimanto变形数据的意义，并探讨 活跃扩张脊俯冲在增生中的作用 配合物

Accretionary prisms are one of the major components of convergent plate orogens, forming the pliant leading edge of the overriding crustal plate. The Shimanto accretionary complex in southwest Japan has received recent study because portions are well-exposed so that detailed structural and stratigraphic relation-ships can be investigated. Results of that study have revealed t hat parts of this accretionary prism are a typical of simple accretion at convergent plate margins. The structural anomalies include a 180o reversal in structural polarity between Eocene and Miocene accreted packets and late stage oroclinal flexing. This renewal will test the hypothesis that these anomalies are attributable to a Miocene episode of spreading-ridge subduction, by a program of computer modeling and further analysis of existing data. Results are expected to clarify the significance of the Shimanto deformational data and explore the role of subduction of actively spreading ridges in accretionary complexes.