U.S.-Ethiopia Dissertation Improvement Research on Petrologic and Geochemical Investigation of Volcanism in theMain Ethopian Rift-Afar Transition Region

埃塞俄比亚国民Tadiwos Chernet(国际和平研究所指导下的博士候选人)将在埃塞俄比亚进行实地工作，以补充1990年期间国际和平研究所和研究生进行的初步实地研究。这项研究的目标是建立地质年代学、地球化学和岩石学框架，从中可以阐明与埃塞俄比亚主要裂谷(MER)和阿法尔之间的过渡带的构造和岩浆演化有关的重要细节。元素和锶同位素地球化学将由T·切尔内特在内部进行；Nd和Pb同位素工作将由国际和平研究所利用华盛顿卡内基研究所地磁系的设施进行。这种类型的地球化学和地质年代学研究对合作机构埃塞俄比亚地质调查研究所非常感兴趣，特别是从更清楚地了解主要硅质火山中心的持续时间和热演化以及获得宝贵的年代和化学信息以帮助正在进行的地质测绘项目的角度。因此，所获得的信息将有助于他们正在努力利用与许多北部Mer和Afar硅质杂岩相关的地热潜力。据设想，在这项具体的研究工作之后，国际和平协会与埃塞俄比亚的合作机构之间的合作将继续下去。该项目与发展中国家科学计划(SDC)的目标有关，即加强发展中国家的科学和工程基础设施，加强美国科学家和工程师与发展中国家同行之间的合作。

An Ethiopian national, Tadiwos Chernet, (Ph.D. candidate under the supervision of the PI), will perform field work in Ethiopia to complement initial field studies conducted by the PI and the graduate student during 1990. The goal of the research is to establish the geochronologic, geochemical, and petrologic framework from which important details bearing on the tectonic and magmatic evolution of the transition zone between the Main Ethiopian Rift (MER) and Afar can be elucidated. The elemental and Sr isotope geochemistry will be performed in-house by T. Chernet; the Nd and Pb isotope work will be done by the PI, using the facilities of the Department of Terrestrial Magnetism, Carnegie Institution of Washington. This type of geochemical and geochronologic study is of great interest to the cooperating institution, the Ethiopian Institute of Geological Surveys, particularly from the standpoints of gaining a clearer understanding of the duration and thermal evolution of major silicic volcanic centers and of gaining valuable age and chemical information to aid in ongoing geologic mapping projects. Thus, the information derived will assist their ongoing efforts to harness the geothermal potential associated with many of northern MER and Afar silicic complexes. It is envisioned that collaboration between the PI and the cooperating institution in Ethiopia will continue well beyond this particular research effort. This project is relevant to the objectives of the Science in Developing Countries (SDC) Program with regard to strengthening scientific and engineering infrastructure in developing countries and increasing cooperation between U.S. scientists and engineers and their counterparts in developing countries.