High pressure metamorphism in the nappes of the Valle dell'Orco traverse (Western Alps collisional belt)
High pressure metamorphism in the nappes of the Valle dell'Orco traverse (Western Alps collisional belt)
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Valle dellOrco 横断（西阿尔卑斯山碰撞带）推覆体中的高压变质作用
DOI：
10.1111/j.1525-1314.1987.tb00392.x
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发表时间：
1987
影响因子：
3.4
通讯作者：
N. Ferrati
中科院分区：
文献类型：
--
作者：
U. Pognante;F. Talarico;N. Rastelli;N. Ferrati
对来自瓦莱dell'Orco（意大利西阿尔卑斯山）切割的推覆体的岩石，特别是Sesia-Lanzo复合单元的岩石进行了详细的野外和岩石学研究，揭示了地质和变质历史，这些历史始于前阿尔卑斯时代，一直持续到阿尔卑斯俯冲碰撞过程。在这些过程中，推覆体维持了早期的高P-低T阶段和后期的低P绿片岩相阶段，但遵循部分独特的P-T-时间轨迹。本文讨论了高山带从俯冲俯冲早期到折返晚期的运动学演化和热历史。变质结晶往往是由不完全和/或局部平衡，和普遍的同变质变形和同变质流体相（如果存在）的组成施加了有效的局部控制反应动力学。
A detailed field and petrological study of rocks from nappes cut by the Valle dell'Orco (Italian Western Alps), in particular the Sesia–Lanzo composite unit, has revealed geological and metamorphic histories which started in pre-alpine times and lasted up to the alpine subduction-collisional processes. During these processes the nappes sustained an early high P–low T stage and a later low P greenschist facies stage, but followed partly distinctive P–T–time trajectories. This paper discusses the kinematic evolution and the thermal history of the alpine belt from the early subduction/underthrust to the later exhumation stage. The metamorphic crystallization is often governed by incomplete and/or local equilibrium, and the pervasive syn-metamorphic deformation and the composition of the syn-metamorphic fluid phase (if present) have exerted an effective local control on reaction kinetics.