U.S.-Bulgaria Cooperative Research: A Novel Approach to Milliprobing Mossbauer Studies of Geologic Samples : Olivine Crystals with Fe-Bearing Precipitates

这是一个美国和保加利亚的合作研究项目，其重点是开发一种新的穆斯堡尔光谱技术，以改善小样本的信号质量，并将其应用于橄榄石中溶解相的研究。主要研究人员是加州大学河滨分校的Larissa Dobrzhinetskaya和Harry Green，以及保加利亚核研究与核能研究所的Todor Ruskov。所提出的技术将提高我们在非常小的样品上测量铁氧化态的能力，重点是确定从非常深的深处挖掘出来的地幔矿物的氧化态。这项工作将有助于确定这些矿物的起源和地幔的氧逸度，这两者目前都没有得到很好的限制。拟议的活动所产生的更广泛的影响是增加了测量小样本穆斯堡尔光谱的设施。这样一个设施有许多地球科学以外的应用，并将促进跨学科合作。这个地球科学研究项目实现了将美国和中欧/东欧的顶尖专家聚集在一起的计划目标，在平等、互惠和互利的基础上，在共同感兴趣和能力强的领域结合互补的努力和能力。

This is a U.S.-Bulgarian cooperative research project that focuses on developing a new Mossbauer spectrometry technique to improve signal quality for small samples, with application to the study of exsolved phases in olivine. The principal investigators are Larissa Dobrzhinetskaya and Harry Green from the University of California at Riverside and Todor Ruskov from the Institute for Nuclear Research and Nuclear Energy in Bulgaria.The proposed technique will improve our ability to measure the oxidation state of iron on very small samples with a focus on determining the oxidation state of mantle minerals exhumed from very deep depths. This work will help determine the origin of these minerals and the mantle's oxygen fugacity, both of which are poorly constrained at present.The broader impact resulting from the proposed activity is enhanced access to facilities for measuring Mossbauer spectra of small samples. Such a facility has numerous applications beyond the geosciences and will foster interdisciplinary cooperation.This project in earth sciences research fulfills the program objectives of bringing together leading experts in the U.S. and Central/Eastern Europe to combine complementary efforts and capabilities in areas of strong mutual interest and competence on the basis of equality, reciprocity, and mutuality of benefit.