Os Isotopic Investigations of Earth's Evolution

本提案早期版本产生的奖项可追溯到 到1988年7月，在很大程度上， 利用拉蒙的新方法， Isolab 54质谱仪。 但在1990年之后， 被证明是更好的，这是PI实验室使用的。 在建议的资助期内， 古地壳岩石的调查，地幔衍生的 橄榄岩和现代幔源火山岩。 这些目标是 （1）研究古白垩纪岩石在多大程度上代表了 更古老大陆物质的壳内“再循环”; 2） 建立了该地区Os同位素不均匀性的现状， 现代地幔; 3）表征Re和Os分布在 地壳和地幔岩石的矿物学尺度。

Awards resulting from earlier versions of this proposal dating back to July, '88, were in large part for the development of a SRIMS technique for the isotopic analysis of Os, using Lamont's new Isolab 54 mass spectrometer. But after 1990 when the NTIMS was shown to be better, this is what has been used in the PI's lab. Efforts during the proposed funding period will involve Re-Os investigations of ancient crustal rocks, mantle-derived peridotites, and modern mantle-derived volcanics. The goals are to: 1) investigate the extent to which old cratonic rocks represent intracrustal "recycling" of even older continental materials; 2) establish the present state of Os isotopic heterogeneity in the modern mantle; and 3) characterize Re and Os distributions on mineralogical scales in both crustal and mantle rocks.