Evidence for Changing Plate Motions in the Tertiary Shimanto Belt, Japan

日本第三纪四万十带板块运动变化的证据

• 批准号: 9418344
• 负责人: Timothy Byrne
• 金额: $ 17.93万
• 依托单位: University of Connecticut
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-01-01 至 1998-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9418344&HistoricalAwards=false
• 关键词: Evidence; Changing; Plate; Motions; Tertiary

9418344 Byrne Ancient deformed accretionary prisms commonly preserve patterns of multiple microstructure such as cleavage generations, fiberous overgrowths and oriented vein sets. Inversions of these kinematic indications to relative plate motions during the deformation event, which is of fundamental importance, is quite speculative due to lack of rigorous tests of the hypothesis that they accurately reflect such motions. This project will examine the pattern of overprinting fabrics and kinematic indicators from the Shimanto Belt of Southwest Japan, an example selected because of a well-known and significant change in convergence directions during the deformation of the Belt, and because this well exposed area has recieved considerable geologic study. Results should provide a clear test of the idea that such features can be inverted to obtain the relative convergence directions between the plates involved. Success in assessing the degree to which such inversion results in accurate plate motions will be widely applicable to other origins.

9418344 Byrne 古变形增生棱柱体通常保存多种显微结构的模式，如解理世代，纤维状增生和定向脉组。这些运动学指标的反演相对板块运动在变形事件，这是至关重要的，是相当投机的，由于缺乏严格的测试的假设，他们准确地反映了这种运动。该项目将研究日本西南部四万十带的叠印组构和运动学指标的模式，选择该带作为一个例子是因为该带变形期间会聚方向发生了众所周知的重大变化，并且因为这个暴露良好的地区已经接受了大量的地质研究。结果应提供一个明确的测试的想法，这些功能可以被倒置，以获得相关板块之间的相对收敛方向。 成功地评估这种反演导致精确板块运动的程度将广泛适用于其他起源。