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Abstract

Summary

Quantifying interactions between uplift, climate, deformation and exhumation processes remains difficult, mainly due to a paucity of data relevant to all processes. Central Andes are a prime example to study the respective role of climate forcing and tectonic activity on mountain building. In this study we propose new data (thermochronology, biostratigraphy, field observations and seismic interpretations) focused on the Eastern Cordillera (EC) and the Sub-Andean Zone (SAZ) of southern Peru between 12ºS and 14ºS, in order to i) constrain the timing of deformation, and to ii) demonstrate that contrary to recent studies, our new data outline that the Plio-Peistocene uplift and erosion of the Andes are more likely related to thrust induced exhumation than to a climate forcing. Low temperature thermochronological results obtained for the EC and the SAZ, as well as the growth strata documented in seismic and on the field allow to determine two main deformation periods: i) from the Oligocene to Middle Miocene (~25-14 Ma), and ii) from the Late Miocene to Pleistocene (~10-2.8 Ma). The Plio-Pleiostocene cooling induced by the erosion of the EC in southern Peru is not controlled by climatic change, but better by the development of duplex in the Andean front.

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/content/papers/10.3997/2214-4609.201413487
2015-06-01
2024-04-29

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References

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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201413487
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Plio-pleistocene Thrusting in the Eastern Amazonian Orogenic Wedge (South Peru)
Conference Proceedings 2015, 1 (2015); https://doi.org/10.3997/2214-4609.201413487
/content/papers/10.3997/2214-4609.201413487
/content/papers/10.3997/2214-4609.201413487
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