Matches in SemOpenAlex for { <https://semopenalex.org/work/W2155588557> ?p ?o ?g. }
Showing items 1 to 84 of
84
with 100 items per page.
- W2155588557 abstract " The potential for valid dating using feldspar minerals has recently been increasingly questioned with the recognition of a range of effects capable of giving rise to age shortfalls. The intention here was to investigate the more serious of these, and to simultaneously extend the surprisingly meagre body of knowledge on the luminescence of the feldspar minerals. A suite of feldspars representative of all major mineral species of the feldspar ternary system was assembled and mineralogically classified by XRD and SEM techniques. Characterization of some luminescence properties relevant to dating (radiation dose-sensitivities, emission spectra, thermal sensitization and bleaching by IR and green light) was conducted to enable comparison of these properties with the anomalous fading behaviour in each feldspar (IRSL and OSL intensities being subsequently measured as a function of storage duration at 10°C and 100°C). Examples of feldspars representative of each major compositional regime of the ternary system were found to fade, and similarly some were stable; no luminescence characteristics or storage duration at these temperatures permitted reliable separation of stable signals. A new method for analysis of localised transition-type anomalous fading was successfully tested on zircon; however the fading mechanism operant in feldspars was found to be tunnelling-type fading. Such fading cannot be circumvented by any feasible laboratory procedure and it was concluded that monitoring of samples for the presence of fading is essential: discovery of fading is a rejection criteria. The long-term trapping stability of the IRSL source traps was investigated by conventional kinetic means, and also by a combined optical and thermal approach in which the bleaching response curves of five selected feldspars were measured along with their low temperature (= 100-400 K) response. It was concluded that the IRSL signal originates from one trap type only in all feldspars, which possesses a constant ground state-to-excited state transition energy of 1.44 ± 0.01 eV. However, the excited state-to-conduction band energy varies depending on the major element composition of the feldspar. Lifetimes of microcline TL from glow curve temperatures > 300°C greatly exceed the minimum required for dating and this work and complementary experiments showed no physical basis for the existence of an age limit for coarse grain feldspars, other than dose saturation. Supplementary work supported the existence of an upper age limit of = 100 ka for fine grain materials." @default.
- W2155588557 created "2016-06-24" @default.
- W2155588557 creator A5066426016 @default.
- W2155588557 date "1993-01-01" @default.
- W2155588557 modified "2023-09-28" @default.
- W2155588557 title "The validity of optical dating based on feldspar" @default.
- W2155588557 hasPublicationYear "1993" @default.
- W2155588557 type Work @default.
- W2155588557 sameAs 2155588557 @default.
- W2155588557 citedByCount "14" @default.
- W2155588557 countsByYear W21555885572019 @default.
- W2155588557 crossrefType "dissertation" @default.
- W2155588557 hasAuthorship W2155588557A5066426016 @default.
- W2155588557 hasConcept C105795698 @default.
- W2155588557 hasConcept C110307207 @default.
- W2155588557 hasConcept C121332964 @default.
- W2155588557 hasConcept C125800877 @default.
- W2155588557 hasConcept C127313418 @default.
- W2155588557 hasConcept C148869448 @default.
- W2155588557 hasConcept C159985019 @default.
- W2155588557 hasConcept C17409809 @default.
- W2155588557 hasConcept C192562407 @default.
- W2155588557 hasConcept C199289684 @default.
- W2155588557 hasConcept C199360897 @default.
- W2155588557 hasConcept C24890656 @default.
- W2155588557 hasConcept C2778518048 @default.
- W2155588557 hasConcept C2778520076 @default.
- W2155588557 hasConcept C2778849375 @default.
- W2155588557 hasConcept C2779870107 @default.
- W2155588557 hasConcept C33923547 @default.
- W2155588557 hasConcept C41008148 @default.
- W2155588557 hasConcept C49040817 @default.
- W2155588557 hasConcept C57273362 @default.
- W2155588557 hasConcept C64452783 @default.
- W2155588557 hasConcept C81978471 @default.
- W2155588557 hasConceptScore W2155588557C105795698 @default.
- W2155588557 hasConceptScore W2155588557C110307207 @default.
- W2155588557 hasConceptScore W2155588557C121332964 @default.
- W2155588557 hasConceptScore W2155588557C125800877 @default.
- W2155588557 hasConceptScore W2155588557C127313418 @default.
- W2155588557 hasConceptScore W2155588557C148869448 @default.
- W2155588557 hasConceptScore W2155588557C159985019 @default.
- W2155588557 hasConceptScore W2155588557C17409809 @default.
- W2155588557 hasConceptScore W2155588557C192562407 @default.
- W2155588557 hasConceptScore W2155588557C199289684 @default.
- W2155588557 hasConceptScore W2155588557C199360897 @default.
- W2155588557 hasConceptScore W2155588557C24890656 @default.
- W2155588557 hasConceptScore W2155588557C2778518048 @default.
- W2155588557 hasConceptScore W2155588557C2778520076 @default.
- W2155588557 hasConceptScore W2155588557C2778849375 @default.
- W2155588557 hasConceptScore W2155588557C2779870107 @default.
- W2155588557 hasConceptScore W2155588557C33923547 @default.
- W2155588557 hasConceptScore W2155588557C41008148 @default.
- W2155588557 hasConceptScore W2155588557C49040817 @default.
- W2155588557 hasConceptScore W2155588557C57273362 @default.
- W2155588557 hasConceptScore W2155588557C64452783 @default.
- W2155588557 hasConceptScore W2155588557C81978471 @default.
- W2155588557 hasLocation W21555885571 @default.
- W2155588557 hasOpenAccess W2155588557 @default.
- W2155588557 hasPrimaryLocation W21555885571 @default.
- W2155588557 hasRelatedWork W1967329269 @default.
- W2155588557 hasRelatedWork W1976641559 @default.
- W2155588557 hasRelatedWork W1977005985 @default.
- W2155588557 hasRelatedWork W1980874692 @default.
- W2155588557 hasRelatedWork W1985508465 @default.
- W2155588557 hasRelatedWork W1990234956 @default.
- W2155588557 hasRelatedWork W1995048384 @default.
- W2155588557 hasRelatedWork W1999282741 @default.
- W2155588557 hasRelatedWork W2000903925 @default.
- W2155588557 hasRelatedWork W2010710299 @default.
- W2155588557 hasRelatedWork W2041872459 @default.
- W2155588557 hasRelatedWork W2042422241 @default.
- W2155588557 hasRelatedWork W2044787796 @default.
- W2155588557 hasRelatedWork W2047079330 @default.
- W2155588557 hasRelatedWork W2080480192 @default.
- W2155588557 hasRelatedWork W2082423707 @default.
- W2155588557 hasRelatedWork W2092978190 @default.
- W2155588557 hasRelatedWork W2093197713 @default.
- W2155588557 hasRelatedWork W2094408279 @default.
- W2155588557 hasRelatedWork W3128341092 @default.
- W2155588557 isParatext "false" @default.
- W2155588557 isRetracted "false" @default.
- W2155588557 magId "2155588557" @default.
- W2155588557 workType "dissertation" @default.