Mantle Xenology

9405443 Fisher这个项目是为了检查由各种MORB捕获的地幔源的丰度和同位素组成，特别注意质量129的异常，它已经被一些工作者发现，但没有被其他人发现。 在根据原始提议进行的工作中，建立了一个新的质谱仪系统，并粉碎了两个典型MORB中的多个等分囊泡。 未观察到质量-129异常。 在这个提议中，我们希望将这项工作扩展到更多的样品，利用分步加热与破碎实验相结合，并测量所有稀有气体的同位素和元素丰度，以更好地表征结果。

9405443 Fisher This project is to examine the abundances and isotopic composition of Xe trapped from mantle sources by various species of MORB, with particular attention paid to the anomaly at mass 129, which has been by some workers but not found by others. In the work performed under the original proposal a new mass spectrometer system was set up and multiple aliquots of vesicles in two typical MORB were crushed. No mass-129 anomaly was seen. In this proposal we hope to extend that work to many more samples, to utilize stepwise-heating in conjunction with the crushing experiments, and to measure the isotopic and elemental abundances of all the rare gases to better characterize the results.