Elson Paiva de Oliveira

• Abstract

  The study of Earth's primitive crust, the mechanisms responsible for its formation and evolution are important topics to understand the origin and differentiation of the continental crust, formation of the first cratons, and when plate tectonics began in our planet. The oldest rocks on Earth are mostly gneiss complexes that occur in cratonic blocks within high-grade metamorphic terrains o…

  The oldest rocks of the Sao Francisco Craton: Geological characteristics and tectonic significance, AP.R

• Abstract

  Key initiatives for this project are: i) Deposition ages of sedimentary rocks; ii) Formation ages of ore deposits; and iii) Archean tectonics. In-situ U-Pb isotope analyses of zircon, monazite, and xenotime by SHRIMP geochronology have been successful in resolving the age of ore formation in Cu-Au and orogenic Au ore systems, banded ore formations, high-pressure metamorphic rocks, and the…

  4D Evolution of mineralization in Archaean Terranes of Brazil, AP.R

• Abstract

  Planet Earth experienced tremendous geodynamic and environmental changes during the Archaean, from 3.85 to 2.50 Ga. The continents grew from more primitive crust, the atmosphere and oceans evolved to oxic conditions, and the first evidences of biological activities emerged in sedimentary rocks. Gold, iron, nickel and other metals were deposited in quantities larger than ever observed duri…

  Evolution of archaean terranes of the São Francisco Craton and the Borborema Province, Brazil: global environmental and geodynamic implications, AP.TEM

(Only some records are available in English at this moment)

• Abstract

  This research project has the major goal of identifying the environmental constraints and chemical signatures of life in the anoxic systems prevailed in the Archean. Archean sedimentary sequences have the potential to record the early oxygen generation in the atmosphere (around 3.0 Ga), and the subsequent build-up of sulfate and sulfide in the oceans (developing euxinic systems) near the …

  Isotope geochemistry and biomarkers in Archaean terranes and in their modern analogues systems: environmental constraints and ecology of early Earth life, BP.PD

• Abstract

  The project deals with the study of CH1, CH2 and CH6 charnockites from the Jequié complex and partially migmatized gneisses and pink granitoids from the Campo Belo complex. These gneisses and granitoids will be studied using XRF, ICP-MS, LA-ICP-MS and SHRIMP, with the main objective of gaining new insights into the understanding of crustal growth and crustal recycling during the Archean i…

  Geological and geochemical investigations on archaen granite-gneiss terranes of São Francisco Craton, BP.PD

• Abstract

  Information about the origin of tonalite-trondhjemite-granodiorite (TTG) series is crucial for our understanding of crust formation during the Archean. While there is general agreement that TTG suite rocks formed by partial melting of mafic crust, the depth, the composition of the source as well as the tectonic environment of formation are still a matter of debate. This study will address…

  Origin of TTG magmas using thermodynamic and trace element modeling, BP.PD

(Only some records are available in English at this moment)

• Abstract

  This proposal intends to study the water columns and sediments of two shallow sulfidic lakes (Mahoney Lake in British Columbia, Canada, and Lime Blue Lake in Washington, USA), in order to better correlate environmental constraints and the ecology of phototrophic sulfur bacteria with the molecular biomarkers preserved in the sediments. The overarching hypothesis is that constraining the en…

  Isotope geochemistry and biomarkers in modern analogues of early Earth systems: environmental constraints and ecology of phototrophic sulfur bacteria, BE.EP.PD