Burnard P, Graham D, Turner G
P. Burnard and G. Turner, Department of Earth Sciences, University of Manchester, Manchester M13 9PL, UK. D. Graham, College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, USA.
Science. 1997 Apr 25;276(5312):568-71. doi: 10.1126/science.276.5312.568.
Gases trapped in individual vesicles in the volatile-rich basaltic glass "popping rock" were found to have the same carbon dioxide, helium-4, and argon-40 composition, but a variable 40Ar/36Ar ratio ( approximately 4000 to >/=40,000). The argon-36 is probably surface-adsorbed atmospheric argon; any mantle argon-36 trapped in the vesicles cannot be distinguished from an atmospheric contaminant. Consequently the 40Ar/36Ar ratios and 3He/36Ar ratios (1.45) determined are minimum estimates of the upper mantle composition. Heavy noble gas relative abundances in the mantle resemble solar noble gas abundance patterns, and a solar origin may be common to all primordial mantle noble gases.
在富含挥发物的玄武质玻璃“爆裂岩”中，被困在单个小泡中的气体被发现具有相同的二氧化碳、氦-4和氩-40组成，但40Ar/36Ar比值可变（约4000至≥40,000）。氩-36可能是表面吸附的大气氩；被困在小泡中的任何地幔氩-36都无法与大气污染物区分开来。因此，所测定的40Ar/36Ar比值和3He/36Ar比值（1.45）是上地幔组成的最低估计值。地幔中重稀有气体的相对丰度类似于太阳稀有气体的丰度模式，并且所有原始地幔稀有气体可能都有一个太阳起源。
