Accessory Minerals and Crustal Processes

9527014沃森拟议的研究的目的是增加我们的理解的副矿物（特别是锆石）的物理化学环境中的中，下地壳。 该项目将包括实验，自然材料分析和数值模拟的结合。 几个子项目计划，包括：（1）继续晶格扩散测量卢瑟福背散射光谱的母和子同位素的关键同位素系统（2）锆石与磷酸盐矿物共存时的地质温度计标定，（3）晶体生长、溶解和化学分带过程的数值模拟，（4）锆石与磷酸盐矿物共存时的温度计标定，（5）锆石与磷酸盐矿物共存时的温度计标定。（4）内部结构的成像（例如分带、过度生长）和这些特征与原位同位素分析的相关性;（5）阴极发光光谱（CL）的发展与电子探针分析相结合，作为识别和区分单个锆石内各种生长区域的起源的手段。 拟议的工作将提供充分利用副矿物作为地壳事件时间和温度记录器所需的工具和见解。

9527014 Watson The objective of the proposed research is to increase our understanding of accessory minerals (particularly zircon) in the physiochemical environment of the mid- to lower-crust. This project will include a combination of experiments, analyses of natural materials and numerical modeling. Several sub-projects are planned, including: (1) continuation of lattice diffusion measurements by Rutherford backscattering spectroscopy on the parent and daughter isotopes of key isotopic systems (U-Pb, Sm-Nd, Lu-Hf); (2) calibration of geothermometers involving zircon coexisting with a phosphate mineral; (3) numerical modeling of crystal growth and dissolution and the processes that lead to chemical zoning; (4) imaging of internal structures (e.g. zoning, overgrowths) and correlation of these features with in situ isotopic analyses; and (5) development of cathodluminescence spectroscopy (CL) in combination with electron microprobe analysis as a means of identifying and distinguishing the origin of various growth regions within individual zircons. The proposed work will provide the tools and insights needed to take full advantage of accessory minerals as recorders of the timing and temperature of crustal events.