High-temperature inter-mineral potassium isotope fractionation: implications for K-Ca-Ar chronology.

ABSTRACT: Recent advances in high-precision potassium (K) isotopic analysis have found considerable isotopic variation in rock samples of the Earth's continental and oceanic crusts; however, it is still uncertain whether there is any resolvable inter-mineral and mineral-melt K isotopic fractionation during igneous and metamorphic processes. Here, we report K isotope compositions of mineral separates from three extremely well preserved igneous rocks (intrusive/extrusive and mafic/intermediate/felsic) in order to investigate possible inter-mineral and mineral-melt K isotopic fractionation at magmatic temperatures. For the first time, we found large inter-mineral fractionation of K isotopes in natural samples (up to 1.072‰), where plagioclase displays a significant enrichment of heavier K isotopes comp

SUBMITTER: Wilson Kuhnel W 

PROVIDER: S-EPMC8740525 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature