| Texto completo | |
| Autor(es): |
Gautheron, Cecile
;
Hueck, Mathias
;
Ternois, Sebastien
;
Heller, Beatrix
;
Schwartz, Stephane
;
Sarda, Philippe
;
Tassan-Got, Laurent
Número total de Autores: 7
|
| Tipo de documento: | Artigo Científico |
| Fonte: | MINERALS; v. 12, n. 5, p. 24-pg., 2022-05-01. |
| Resumo | |
Quantifying geological processes has greatly benefited from the development and use of thermochronometric methods over the last fifty years. Among them is the (U-Th)/He dating method, which is based on the production and retention, within a crystal structure, of radiogenic He-4 atoms associated with the alpha decay of U, Th and Sm nuclei. While apatite has been the main target of (U-Th)/He studies focusing on exhumation and burial processes in the upper levels of the continental crust (similar to 50-120 degrees C), the development of (U-Th)/He methods for typical phases of igneous and metamorphic rocks (e.g., zircon and titanite) or mafic and ultramafic rocks (e.g., magnetite) over the last two decades has opened up a myriad of geological applications at higher temperatures (>100-300 degrees C). Thanks to the understanding of the role of radiation damage in He diffusion and retention for U-Th-poor and rich mineral phases, the application of (U-Th)/He thermochronometry to exhumation processes and continental evolution through deep time is now mainstream. This contribution reviews the (U-Th)/He thermochronometer principle and the influence of radiation damage in modifying the diffusion behavior. It presents applications of (U-Th)/He dating to problems in tectonic and surface processes at shallow to middle crustal depths (>100-300 degrees C). New and promising applications using a combination of methods will stimulate a research avenue in the future. (AU) | |
| Processo FAPESP: | 19/06838-2 - Zonas de cisalhamento Brasilianas/Pan-Africanas no Cinturão Kaoko e conexões com a América do Sul: evolução Neoproterozoica e reativações fanerozoicas |
| Beneficiário: | Mathias Hueck |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |