2003/12/01 by G. Erfurt · 2 citations
Earth and Planetary Sciences · Environmental Science · Physics and Astronomy · #Geology and Paleoclimatology Research #Methane Hydrates and Related Phenomena #Planetary Science and Exploration
paper · doi:10.1002/pssa.200306700
crossref issued 2003/12/01 · crossref published 2003/12/01 · crossref published-print 2003/12/01 · openalex publication_date 2003/12/01 · crossref created 2004/01/20 · crossref deposited 2021/07/04 · openalex created_date 2025/10/10 · crossref indexed 2026/07/27 · openalex updated_date 2026/07/28
This paper reports on new results of the characteristics of photo- and radioluminescence emissions at 865 nm and 910 nm emitted by potassium-rich feldspars (KAlSi3O8). For the physical interpretation of its behaviour, the IR luminescence in potassium-rich feldspars is compared to a well investigated IR luminescence occurring in lead-doped potassium chloride (KCl:Pb) and to a study on the IR luminescence of lead-rich KAlSi3O8 (amazonite). The emissions in both materials, potassium-rich feldspar and potassium chloride, are most likely due to electron transitions in Pb+ from the 72P1/2 and 72S1/2 excited states to the 62S1/2 ground state of Pb+. Pb+ originates from interaction processes of Pb2+ cations, substituted for K+ cations in the tetrahedral feldspar framework or the cubic lattice of KCl, with ionising radiation (Pb2+ + β, γ, … → Pb+). Another result of the experiments reported is the fact, that this radiatively induced conversion is reversed by thermal treatment of the minerals (Pb+ + T → Pb2+). Also, the Pb+ centres can be “optically bleached”, which is also interpreted as reversed conversion Pb+ + ħω → Pb2+. The conclusions of this paper have important implications for the physical precision of a recently developed luminescence dating method for the determination of the deposition time of Quaternary sediments using the infrared radiofluorescence (IR-RF) of potassium-rich feldspar grains. (© 2003 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)