EAR-PF: Nanochronology and Moho Topography: Towards Precise and Accurate Constraints on the Evolution of North American Continental Lithosphere

格雷戈里·杜蒙德博士被授予美国国家科学基金会地球科学博士后奖学金，在马萨诸塞州理工学院开展研究和教育计划。Dumond博士将开发一种技术，通过测量锆石和独居石中的铀和铅同位素来确定矿物颗粒不同部分的年龄。杜蒙德博士将使用聚焦离子束采集微米大小的矿物颗粒样本，然后他将使用热电离质谱仪确定同位素组成。这种新方法将使科学家能够精确地量化矿物颗粒不同部分的年龄，从而将矿物生长事件与地球深处的地质条件和过程联系起来。此外，杜蒙德博士将与处于不同职业阶段的研究生密切合作。他将领导研究生水平的研讨会和课程，讨论大陆的化学演变以及用于研究这种演变的工具（例如同位素和计算机模型）。

Dr. Gregory Dumond is awarded an NSF Earth Science Postdoctoral Fellowship to carry out a program of research and education at the Massachusetts Institute of Technology. Dr. Dumond will develop a technique to determine the age of different sections of a mineral grain by measuring uranium and lead isotopes in zircons and monazites, for example. Dr. Dumond will take micrometer size samples of mineral grains using a focused ion beam and then he will determine the isotope composition using a thermal ionization mass spectrometer. The new method will allow scientists to quantify the age of different sections of the mineral grains in a precise matter to link mineral growth episodes to geologic conditions and processes deep within the earth?s crust.In addition, Dr. Dumond will be work closely with graduate students at different stages of their career. He will lead graduate level seminars and classes on the chemical evolution of continents and on tools that are used to study this evolution (e.g. isotopes and computer models).