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

合作研究：增生棱镜中记录的扩展山脊-海沟相互作用：日本南部第三纪四万十带

• 批准号: 8720743
• 负责人: Timothy Byrne
• 金额: $ 2万
• 依托单位: Brown University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-06-15 至 1989-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8720743&HistoricalAwards=false
• 关键词: Collaborative; Research; Spreading; Ridge; Trench

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.

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一个典型的 在会聚的板块边缘简单的增生。 结构性 异常包括结构极性发生180 °逆转， 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