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合作的研究项目，重点是开发一种新的穆斯堡尔谱学技术，以提高小样本的信号质量，并应用于橄榄石中出溶相的研究。主要研究人员是来自加州大学河滨分校的Larissa Dobrzhinetskaya和Harry Green，以及来自保加利亚核研究和核能研究所的Todor Ruskov。这项拟议的技术将提高我们在非常小的样本上测量铁的氧化态的能力，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来源和地幔的氧逸度，这两者目前都受到很好的限制。拟议的活动产生的更广泛的影响是更容易获得测量小样本穆斯堡尔谱的设施。这样的设施在地球科学之外有许多应用，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东欧的顶尖专家聚集在一起，在平等互利和互惠互利的基础上，在共同利益和能力强的领域结合互补努力和能力的计划目标。

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.