Spatial distributions of sediment provenance and erosion rates of modern deposits in eastern Andean Cordillera and their relationship to natural controls

• Grant number: 23/16318-1
• Support Opportunities: Scholarships in Brazil - Master
• Effective date (Start): March 01, 2024
• Effective date (End): February 28, 2026
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geology
• Principal Investigator: Fabiano do Nascimento Pupim
• Grantee: Gabriella Brandino de Campos
• Host Institution: Instituto de Ciências Ambientais, Químicas e Farmacêuticas (ICAQF). Universidade Federal de São Paulo (UNIFESP). Campus Diadema. Diadema , SP, Brazil
• Associated research grant: 22/03007-5 - From sand grains to mountain chains: linking recent Andean orogenesis and climate changes to the assembly of lowland Amazonia (PAALE), AP.PNGP.PI

Abstract

Geological archives like river terraces and continental and marine sediment cores register environmental conditions through proxies in an indirect way. Therefore, the appropriate reconstruction of landscape changes along thousand to million years relies on understanding the relationship between the modern signals and their natural controls. Here, we will determine the spatial distributions of two signals in modern deposits that are key for understanding landscape changes in eastern Andean Cordillera: sediment provenanceand erosion rates. Provenance information will be assessed by determining the luminescence signature of modern sediments transported by the main tributaries of the western and central Amazon River drainage basin. In-situ cosmogenic nuclides(10Be and 26Al concentrations) for the eastern Andes in Peru, Ecuador, and south Colombia. Potential relationships with tectonic, topographic, lithologic, and climate controls will be accessed for both provenance and erosion rates findings. By doing this, we will provide an in-depth understanding of the way luminescence and erosion signals are recorded in modern sediments and transported from Andean sourced rivers toAmazonian lowlands, improving our ability to interpret paleo signals recorded on fossilcontinental and marine sediment deposits.