Case Study Investigation of the Relationships Between Fluid Infiltration and Deformation Using Oxygen Isotope Zoning in Metamorphic Porphyroblasts

本研究将采用激光探测氧同位素分析和新建立的进阶变质过程中矿物同位素变化预测模型，综合检验变质过程中流体入渗与变形之间是否存在成因关系。将通过获得变质卟啉母岩和基质相的氧同位素分带剖面和/或图来研究这种关系。选择三个不同的角闪岩相区（新罕布什尔州中西部、新罕布什尔州西南部和智利的Tierra del Fuwgo）进行研究，因为它们在P-T、T-t和变形史方面具有很好的特征，而且它们代表了一系列的构造环境、流体和变形史。

9316349 Kohn This study will employ laser probe oxygen isotope analysis and a recently developed predictive model of mineral isotopic changes during prograde metamorphism in an intergrative effort to test whether there is a genetic relationship between fluid infiltration and deformation during metamorphism. The relationship will be investigated by obtaining oxygen isotope zoning profiles and/or maps for both metamorphic porphyroblasts and matrix phases. Three different amphibolite-facies areas (west-central New Hampshire, southwestern New Hampshire, and Tierra del Fuwgo, Chili) were selected for study because they are well characterized with respect to their P-T, T-t and deformational histories, and because they represent a range of tectonic settings and fluid and deformational histories.