Alpine Eclogites and Blueschists - Markers of Subduction or Continental Collision?

高山榴辉岩和蓝片岩 - 俯冲或大陆碰撞的标志？

• 批准号: 9526596
• 负责人: Eric Essene
• 金额: $ 7.97万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-01-01 至 1998-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9526596&HistoricalAwards=false
• 关键词: Alpine; Eclogites; Blueschists; Markers; Subduction

9526596 Essene This project involves petrological, geochemical, and isotopic studies of granulitic rock from different tectonic settings within the Sesia-Lanzo Zone (Western Alps) that record various degrees od transformations. Specific tasks include: (1) thermobarometric studies on eclogites, blueschists and greenschists to constrain the depths to which the rocks have been buried; (2) evaluation of the role of fluids in triggering the transformations between the facies; (3) reevaluation of thermodynamic data for typical eclogite/blueschist minerals and derivation of a new internally consistent petrogenic grid for blueschists and eclogites; (4) radiogenic isotopic studies (Sm-Nd and U-Pb) to establish the timing of the events and the influence of metamorphic transitions on the behavior of these systems. The results of this study will be important to evaluate discrepancies in the age of high pressure metamorphism in the Western Alps and will lead to a better understanding of deep crustal processes occurring during mountain building events in convergent tectonic zones.

9526596 该项目涉及对Sesia-Lanzo带（西阿尔卑斯山）内不同构造背景的麻粒岩进行岩石学、地球化学和同位素研究，这些麻粒岩记录了不同程度的转变。 具体任务包括：（1）对榴辉岩、蓝片岩和绿片岩的温压研究，以确定岩石的埋藏深度;（2）评价流体在触发岩相转换中的作用;（3）重新评价典型榴辉岩/蓝片岩矿物的热力学数据，并推导出蓝片岩和榴辉岩新的内部一致的成岩格网;（4）放射性同位素研究（Sm-Nd和U-Pb），以确定事件发生的时间和变质转变对这些系统行为的影响。 这项研究的结果将是重要的，以评估在西阿尔卑斯山的高压变质作用的年龄差异，并会导致更好地了解地壳深部过程中发生的造山活动在收敛构造带。