COLLABORATIVE RESEARCH: Tectonic Consequences of Ridge Subduction and Plate Reorganization; the Chugach MetamorphicComplex, Alaska

合作研究：山脊俯冲和板块重组的构造后果；

• 批准号: 9304062
• 负责人: Virginia Sisson
• 金额: --
• 依托单位: William Marsh Rice University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-08-01 至 1997-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9304062&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; Tectonic; Consequences; Ridge

9304062 Sisson Most tectonic processes are ultimately driven by plate motions, however the tie between the two is generally obscure except in the simplest cases. Recent work in the Chugach Metamorphic Complex of Alaska suggests that the history of the complex is intimately tied not only to ridge subduction but to a North Pacific plate reorganization that changed the plate configuration in the vicinity of the subducting ridge. This hypothsis will be tested in this project by three dimensional structural analysis, geochronology and geochemical techniques. Results have important implications for early Cenozoic North Pacific plate reconstructions that ultimately ended with demise of the Kula plate. In addition it offers the opportunity to examine deep seated processes that accompany ridge-trench- ridge triple junction interactions that involves a highly oblique component on one limb of the triple junction.

[304062]西松大多数构造过程最终是由板块运动驱动的，然而，除了最简单的情况外，两者之间的联系通常是模糊的。最近对阿拉斯加楚加奇变质杂岩的研究表明，该杂岩的历史不仅与洋脊俯冲密切相关，而且与北太平洋板块重组密切相关，那次重组改变了俯冲洋脊附近的板块构造。这一假设将在本项目中通过三维构造分析、地质年代学和地球化学技术进行检验。研究结果对以库拉板块消亡告终的早新生代北太平洋板块重建具有重要意义。此外，它还提供了考察伴随脊-沟-脊三联结相互作用的深层过程的机会，其中包括在三联结的一个分支上的高度倾斜成分。