Petrologic and Stable Isotopic Investigation of the Role of Metasomatism During Regional Metamorphism in the Barrovian Type Area, Scotland

[405889]本研究将继续探讨大交代作用控制泥岩矿物学演化的假说。如果同变质流体的流动过程可能普遍改变了泥岩的化学性质，那么变质作用在决定中下地壳的物理化学演化中所起的作用就比以前认为的要大得多。通过在苏格兰高地巴罗维亚型地区进行岩石学和稳定同位素综合研究，验证上述假设。本研究的目的是：(1)通过区域岩脉组作图和岩石学质量平衡分析确定传质的性质和影响；(2)通过岩石学观测和后向散射电子成像确定相对于变质和变形事件的传质时间；(3)利用岩石学和稳定同位素方法确定交代流体的通量、流体流动的时间尺度和流体流动路径。

9405889 Ague The proposed research will continue to address the hypothesis that major metasomatism may control the mineralogic evolution of pelites. If pelite chemistry may be commonly altered as a result of syn-metamorphic fluid flow processes, then metamorphism plays a much larger role in determining the physicochemical evolution of the middle and lower crust than previously thought. The hypothesis will be tested by carrying out an integrative petrologic and stable isotope study in Barrovian type area of the Scottish Highlands. The aims of the proposed research are to (1) determine the nature and effects of mass transfer through regional mapping of vein sets and petrologic mass balance analysis, (2) constrain the timing of mass transfer relative to metamorphic and deformational events using petrographic observations and backscattered electron imaging, and (3) determine the fluxes of metasomatic fluids, time scales of fluid flow, and fluid flow paths using both petrologic and stable isotope methods.