Catálogo de publicaciones - revistas
Quaternary Research
Resumen/Descripción – provisto por la editorial en inglés
Publishing articles from the numerous disciplines that contribute to our knowledge of the Quaternary Period, Quaternary Research: An Interdisciplinary Journal focuses on studies in the earth and biological sciences. The journal features papers on previously unpublished research results that will be of interest to a diverse interdisciplinary audience.Research Areas include:
• Geoarcheology
• Geochemistry and geophysics
• Geochronology
• Geomorphology
• Glaciology
• Neotectonics
• Paleobotany and paleoecology
• Paleoclimatology
• Paleogeography
• Paleohydrology
• Paleontology
• Paleoceanography
• Paleopedology
• Quaternary geology
• Volcanology and tephrochronology
Palabras clave – provistas por la editorial
No disponibles.
Disponibilidad
Institución detectada | Período | Navegá | Descargá | Solicitá |
---|---|---|---|---|
No detectada | desde sep. 1970 / hasta nov. 2016 | ScienceDirect |
Información
Tipo de recurso:
revistas
ISSN impreso
0033-5894
ISSN electrónico
1096-0287
Editor responsable
Elsevier
País de edición
Países Bajos
Fecha de publicación
1970-
Cobertura temática
Tabla de contenidos
Accuracy of cosmogenic ages for moraines
Jaakko Putkonen; Terry Swanson
<jats:title>Abstract</jats:title><jats:p>Analyses of all published cosmogenic exposure ages for moraine boulders show an average age range of 38% between the oldest and youngest boulders from each moraine. This range conflicts with the common assumption that ages of surface boulders are the same as the age of the landform. The wide spread in boulder ages is caused by erosion of the moraine surface and consequent exhumation of fresh boulders. A diffusion model of surface degradation explains the age range and shows that a randomly sampled small set of boulders (<jats:italic>n</jats:italic> = 3–7) will always yield a lower age limit for the moraine. The model indicates that for identical dating accuracy, six to seven boulders are needed from old and tall moraines (40,000–100,000 yr, 50–100 m initial height) but only one to four boulders from small moraines (20,000–100,000 yr, 10–20 m). By following these guidelines the oldest obtained boulder age will be ≥90% of the moraine age (95% probability). This result is only weakly sensitive to a broad range of soil erosion rates. Our analysis of published boulder ages indicates that <3% of all moraine boulders have prior exposure, and 85% of these boulders predate the dated moraine.</jats:p>
Pp. 255-261
Lichenometric dating using Rhizocarpon subgenus Rhizocarpon in the Patagonian Andes, Argentina
Irene Adriana Garibotti; Ricardo Villalba
<jats:title>Abstract</jats:title><jats:p>This study represents the first attempt to develop and apply lichenometric dating curves of <jats:italic>Rhizocarpon</jats:italic> subgenus <jats:italic>Rhizocarpon</jats:italic> for dating glacier fluctuations in the Patagonian Andes. Six glaciers were studied along the Patagonian Andes. Surfaces of known ages (historical evidences and tree-ring analyses) were used as control sites to develop indirect lichenometric dating curves. Dating curves developed for the studied glaciers show the same general logarithmic form, indicating that growth rate of subgenus <jats:italic>Rhizocarpon</jats:italic> decreases over time. The strong west–east precipitation gradient across the Andean Cordillera introduces statistically significant differences in the growth curves, with faster growth rates in the moist west sites than the drier eastern sites. Latitudinal difference among the studied glaciers does not appear to be a major factor regulating lichen growth rates. Therefore, we developed two lichenometric curves for dating glacier fluctuations in wetter and drier sites in the Patagonian Andes during the past 450 yrs. Application of the developed curves to moraine dating allowed us to complement glacial chronologies previously obtained by tree-ring analyses. A first chronosequence for moraine formation in the Torrecillas Glacier (42°S) is presented. Our findings confirm the utility of lichenometry to date deglaciated surfaces in the Patagonian Andes.</jats:p>
Palabras clave: General Earth and Planetary Sciences; Earth-Surface Processes; Arts and Humanities (miscellaneous).
Pp. 271-283