Mantle Xenology

这项研究旨在检查丰度和同位素 来自地幔源的捕集物的组成。 先前的工作已经 显示大洋中脊玄武岩玻璃是 有效的陷阱，但两个复杂的解释， 数据出现了：可能存在类似大气的 成分，以及氙的质量分馏的可能性 同位素 陆地同位素捕虏学最重要的方面是 测量到的异常值是129/130比值， 解释为由于寿命短的I-129的衰变。 这样的 解释要求早期脱气模型;即，内 大约是地球历史的前2500万年。 但 解释是模糊的事实，几个作者有 没有发现异常，并由上述并发症。 计划调查是否存在 通过在各种MORB中进行的测量， 通过破碎的类似大气的分量的大小， 逐步加热运行，并同时测量Kr 同位素丰度来掌握质量的可能作用 分馏

This research seeks to examine the abundances and isotopic composition of Xe trapped from mantle sources. Previous work has shown that mid-ocean ridge basaltic glasses are the most efficient traps, but two complications to the interpretation of the data arise: the possible presence of an atmospheric-like component, and the possibility of mass fractionation of the xenon isotopes. The most important aspect of terrestrial isotopic xenology has been the measurements of an anomaly i the Xe-129/Xe-130 ratio, interpreted as due to the decay of short-lived I-129. Such an interpretation mandates an early-degassing model; i.e., within roughly the first 25 million years of earth history. But the interpretation is clouded by the fact that several authors have found no anomaly, and by the complications referred to above. It is planned to investigate the existence and extent of the anomaly by measurements made in a variety of MORB, to estimate the magnitude of the atmospheric-like component by crushing and stepwise-heating runs, and with simultaneous measurements of Kr isotopic abundances to gain a handle o the possible role of mass fractionation.