Banca de QUALIFICAÇÃO: Gabriel Ribeiro Moizinho

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : Gabriel Ribeiro Moizinho
DATE: 19/07/2023
TIME: 14:00
LOCAL: Sala de videoconferência e Teams
TITLE:

Late Cenozoic co-evolution of tectonics, weathering and climate in the Amazon Basin: insights from neodymium and hafnium isotopes

KEY WORDS:

weathering, climate, Andes, Amazon Basin Hf-Nd and Li, Geochemistry, Rare Earths Elements.

PAGES: 90
BIG AREA: Ciências Exatas e da Terra
AREA: Geociências
SUBÁREA: Geologia
SUMMARY:

Chemical weathering plays an important role in sequestering atmospheric CO2, but its potential influence on global climate over geological time remains debated. To some extent, this uncertainty arises from the difficulty in separating the respective contribution of igneous/metamorphic and sedimentary rocks to total weathering rates during mountain erosion; two types of rocks having different impacts on the long-term carbon cycle.  Here, we propose a novel approach for identifying the origin of weathered rocks on continents and their evolution through time, based on the combined analyses of geochemical and isotopic (Hf-Nd and Li) proxies on iron oxide and detrital silicate fractions in the sediment record. This new approach will be used to reconstruct, for the first time, the weathering history of the Amazon Basin for the last 20 Ma and its relationships to the Andean uplift and global climate.

BANKING MEMBERS:
Interno - 1303786 - ELTON LUIZ DANTAS
Interna - 1897668 - NATALIA HAUSER
Presidente - 418662 - ROBERTO VENTURA SANTOS
Externo à Instituição - TRISTAN CHARLES CLITANDRE ROUSSEAU - UFC