Optical dating of alluvial deposits at the orogenic front of the andean precordillera (Mendoza, Argentina)
dc.bibliographicCitation.firstPage | 62 | eng |
dc.bibliographicCitation.issue | 1 | eng |
dc.bibliographicCitation.journalTitle | Geochronometria : journal on methods and applications of absolute chronology | eng |
dc.bibliographicCitation.lastPage | 75 | eng |
dc.bibliographicCitation.volume | 39 | eng |
dc.contributor.author | Schmidt, Silke | |
dc.contributor.author | Tsukamoto, Sumiko | |
dc.contributor.author | Salomon, Eric | |
dc.contributor.author | Frechen, Manfred | |
dc.contributor.author | Hetzel, Ralf | |
dc.date.accessioned | 2022-02-17T08:14:10Z | |
dc.date.available | 2022-02-17T08:14:10Z | |
dc.date.issued | 2012 | |
dc.description.abstract | Well constrained numerical ages of alluvial fan sediments are key to understanding the chronology of alluvial episodes and tectonic activity at the front of the Andean Precordillera. We test-ed the application of radiocarbon and optically stimulated luminescence (OSL) dating in the distal part of an alluvial fan five kilometers north of Mendoza. For OSL dating a large number of aliquots (n > 70)-each composed of ̃50 quartz grains-were measured in order to obtain reliable burial ages despite scattered dose distributions. Owing to a feldspar contamination in all samples, an infrared stimulation was inserted before each OSL measurement, which reduced the feldspar OSL signal suc-cessfully. By using the minimum age model we obtained stratigraphically consistent burial ages of al-luvial deposits in a depth profile. The uppermost ̃1 m of sediment is composed of debris flow depos-its buried 770±76 years ago. Three plant remnants used for radiocarbon dating from the same layer, however, yielded ages younger than 350 years, which are interpreted to underestimate the deposition-al age. Underneath the debris flow, a major unconformity cuts a series of distal alluvial fan sediments with interstratified floodplain deposits, which are composed of sandy and calcite-rich silt layers, re-spectively. Three samples from this unit which were distributed over one meter of sediment thickness yielded statistically concordant OSL ages of 12.3±1.2 ka, 12.3±1.2 ka, and 11.7±1.1 ka. The deposi-tion of these sediments during the latest Pleistocene coincides with a phase of cool and humid cli-mate, which occurred before the alluvial fan propagated farther into the foreland. The overlying de-bris flow sediments are associated with alluvial fan incision during the arid Late Holocene. © 2011 Silesian University of Technology. | eng |
dc.description.version | publishedVersion | eng |
dc.identifier.uri | https://oa.tib.eu/renate/handle/123456789/8024 | |
dc.identifier.uri | https://doi.org/10.34657/7065 | |
dc.language.iso | eng | eng |
dc.publisher | Warsaw : De Gruyter | eng |
dc.relation.doi | https://doi.org/10.2478/s13386-011-0050-5 | |
dc.relation.essn | 1897-1695 | |
dc.rights.license | CC BY-NC-ND 3.0 Unported | eng |
dc.rights.uri | https://creativecommons.org/licenses/by-nc-nd/3.0/ | eng |
dc.subject.ddc | 620 | eng |
dc.subject.ddc | 690 | eng |
dc.subject.other | Alluvial fan sediments | eng |
dc.subject.other | Andean Precordillera | eng |
dc.subject.other | Incomplete bleaching | eng |
dc.subject.other | Minimum age model | eng |
dc.subject.other | OSL dating | eng |
dc.title | Optical dating of alluvial deposits at the orogenic front of the andean precordillera (Mendoza, Argentina) | eng |
dc.type | Article | eng |
dc.type | Text | eng |
tib.accessRights | openAccess | eng |
wgl.contributor | LIAG | eng |
wgl.subject | Ingenieurwissenschaften | eng |
wgl.type | Zeitschriftenartikel | eng |
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