Identification of chondritic krypton and xenon in Yellowstone gases and the timing of terrestrial volatile accretion.

ABSTRACT: Identifying the origin of noble gases in Earth's mantle can provide crucial constraints on the source and timing of volatile (C, N, H₂O, noble gases, etc.) delivery to Earth. It remains unclear whether the early Earth was able to directly capture and retain volatiles throughout accretion or whether it accreted anhydrously and subsequently acquired volatiles through later additions of chondritic material. Here, we report high-precision noble gas isotopic data from volcanic gases emanating from, in and around, the Yellowstone caldera (Wyoming, United States). We show that the He and Ne isotopic and elemental signatures of the Yellowstone gas requires an input from an undegassed mantle plume. Coupled with the distinct ratio of ¹²⁹Xe to primordial Xe isotopes in Yellowsto

SUBMITTER: Broadley MW 

PROVIDER: S-EPMC7322010 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature