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

9526596艾赛尼本项目涉及对来自西阿尔卑斯山脉塞西亚-兰佐带（西阿尔卑斯山脉）不同构造背景的麻粒质岩石进行岩石学、地球化学和同位素研究，这些岩石记录了不同程度的古代转变。具体任务包括：(1)对榴辉岩、蓝片岩和绿片岩进行热气压研究，以限定岩石的埋藏深度；(2)评价流体在引发相转换中的作用；(3)重新评价典型榴辉岩/蓝片岩矿物的热力学数据，推导出蓝片岩和榴辉岩新的内部一致的成岩网格；(4)放射性成因同位素研究（Sm-Nd和U-Pb），以确定事件的时间和变质转变对这些系统行为的影响。本研究结果对于评价西阿尔卑斯地区高压变质作用年龄的差异具有重要意义，并有助于更好地理解汇聚构造带造山事件期间发生的深部地壳过程。

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.