Using fallout Cs-137 and OSL as sediment tracers in badlands: a case study of Tepezala volcano (Central Mexico)
Por:
Munoz-Salinas, E., Castillo, M., Arce, J. L., Correa-Metrio, A., Cruz-Zaragoza, E., Valoix, A.
Publicada:
1 feb 2023
Ahead of Print:
1 feb 2023
Resumen:
Badlands are dynamic landforms that cause soil loss over extensive
areas. In this study, we analyze recent sediment mobilization in a
badland area by using a novel approach that integrates fallout Cs-137
and optically stimulated luminescence (OSL). We assess how erosion and
sediment storage operate over the Tepezala volcano, a tephra cone
located in central Mexico. We analyzed a set of sediment samples
extracted from the surface of an altitudinal sequence with different
land uses to explore how landscape management practices relate to
erosion and, depth profiles from local sinks, to detect patterns of
sediment mobilization and sedimentation. We compared Cs-137 and OSL
results with reference values to evaluate whether erosion or deposition
is predominant and to assess how deep the erosive processes in the
landscape are. Results from fallout Cs-137 values indicate that in those
badlands with implemented actions to mitigate erosion, sediment is
retained. The high luminescence values show that the edaphic soil has
been flushed away, and subsoil crops out in some of the sampled sites.
For the case of depth profiles, maximum values of Cs-137 coincide with
high luminescence values, suggesting that in such sites, the sediment
was mobilized during rapid incision episodes that caused widespread
erosion of the landscape. We detected at least three episodes of rapid
incision in 10 years of sediment record. We propose that using Cs-137
and OSL together can provide valuable information of the sediment
transport in settings dominated by fast erosion as do occur for the case
of badlands.
Filiaciones:
Munoz-Salinas, E.:
(Corresponding Author), Univ Nacl Autonoma Mexico, Estn Reg Noroeste, Inst Geol, Colosio S-N, Hermosillo 83250, Sonora, Mexico
Univ Nacl Autonoma Mexico, Estn Reg Noroeste, Inst Geol, Colosio S-N, Hermosillo 83250, Sonora, Mexico
Lab Nacl Geoquim & Mineral LANGEM, Ciudad Univ, Mexico City, DF, Mexico
Castillo, M.:
Univ Nacl Autonoma Mexico, Estn Reg Noroeste, Inst Geol, Colosio S-N, Hermosillo 83250, Sonora, Mexico
Lab Nacl Geoquim & Mineral LANGEM, Ciudad Univ, Mexico City, DF, Mexico
Arce, J. L.:
Univ Nacl Autonoma Mexico, Inst Geol, Ciudad Univ, Mexico City, DF, Mexico
Correa-Metrio, A.:
Univ Nacl Autonoma Mexico, Inst Geol, Ciudad Univ, Mexico City, DF, Mexico
Univ Nacl Autonoma Mexico, Ctr Geociencias, Queretaro, Mexico
Cruz-Zaragoza, E.:
Univ Nacl Autonoma Mexico, Unidad Irradiac, Inst Ciencias Nucl, Ciudad Univ, Mexico City, DF, Mexico
Valoix, A.:
Univ Nacl Autonoma Mexico, Posgrad Ciencias Tierra, Ciudad Univ, Mexico City, DF, Mexico
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