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

9316349 Kohn本研究将采用激光探针氧同位素分析和最近开发的一个预测模型，在综合努力，以测试是否有一个成因之间的关系，在变质作用过程中的流体渗透和变形的矿物同位素变化。 通过获得变质变斑晶和基质相的氧同位素分带剖面和/或图，将研究这种关系。 选择了三个不同的角闪岩相区域（新罕布什尔州中西部、新罕布什尔州西南部和辣椒的Tierra del Fuwgo）进行研究，因为它们在P-T、T-t和变形历史方面具有很好的特征，而且它们代表了一系列构造背景、流体和变形历史。

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.