Se encontraron 2 investigaciones en el año 2026
The uplift of the Andes has been recognized as a key driver of South America climatic regimes and lowland Amazonian landscapes, whose changes through time were directly or indirectly crucial to Amazonia becoming the most diverse continental ecosystem on Earth. However, the timing, rates, and mechanisms that link the recent growth of the Andes (ca. 10Ma) to regional climate and physical landscape in the Amazonian lowlands remain poorly understood. Here, we will reconstruct the spatiotemporal trends of erosion rates and sediment flux from the Andes to the Amazonian lowlands using cosmogenic nuclides, luminescence signals, and magnetic parameters. Therefore, we will investigate a unique and comprehensive set of spatially distributed surface sedimentary deposits, as well as deep and continuous sediment cores that will be drilled in strategic sites at western (Acre Basin), central (Solimões Basin), and eastern (Marajó Basin) Amazonia, under the "Trans-Amazon Drilling Project (TADP)" and Ocean Drilling Program (ODP). Our records will provide original insights into (1) how the history of uplift and erosion of the world's longest mountain chain is stored in the world's largest river basin; (2) how orbital and millennial-scale hydroclimate variability affects erosion rates and sediment flux from Andean and cratonic terrains within the Amazon; (3) how the mountain erosion signal is transformed from its source to the ocean, the ultimate sink in the system; and (4) a potentially transformative history of uplift and climate change in Amazonia's lowland physical landscapes and its influence on biotic diversification over the last 10 Ma, a period when most extant species originated. In addition, this project will allow the outstanding training of students and scientific development through exchange among national and international research institutions from Brazil, Germany, and Peru.
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The main objective of this research proposal is to propose a new tectonic model to explain the emplacement and exhumation of the CBB in the context of the predominantly compressional setting in this segment of the Central Andes and taking into account its structural relationships with the main neighboring geological provinces (e.g., CO, MFTB, CN). In order to tackle this the following specific objectives are delineated: - To establish the detailed low temperature cooling history along two/three cross-sections of the CBB. - To characterize the structure and intrusive relationship along the eastern border of the CBB. - To construct two balanced structural cross-sections of the MFTB. - To detect potential Plio-Quaternary compressive reactivations across the MFTB main thrusts. - To determine the low-temperature cooling history of the CO at relevant areas of interest.
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