Paleogene foreland basin formation and Neogene surface uplift in the Peruvian central Andes

Abstract:

Cenozoic nonmarine clastic basin strata in southern Peru contain valuable clues to how topography developed in the central Andes. To understand topographic growth in this region we take a multidisciplinary approach incorporating basin analysis, detrital geochronology, and stable isotopic paleoaltimetry. First, we measured 6400 m of basin fill in the northernmost Altiplano, characterized by lithofacies analysis, paleocurrent measurements, sandstone and conglomerate compositional analysis, and detrital zircon U-Pb geochronology. Next, we sampled and analyzed the H compositions of volcanic glasses from a 650 by 300 km area in southern Peru (13-17 S) to determine Neogene surface uplift patterns. Modern waters were also sampled for calculation of modern lapse rates and comparison to previously reported paleo-lapse rates that may vary depending on regional elevation and latitude.

Año de publicación:

2018

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Fuente:

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