Abstract
The objective of the proposed work is to move forward our understanding of the evolutionary adaptations of early life to the increasing atmospheric oxygen concentration. Our aim is to characterize the evolving biosphere and the changing environments across the 2.45 to 2.32 Ga old Great Oxidation Event and the ~0.8 to 0.54 Ga old Neoproterozoic Oxidation Event. To achieve this goal, we will use available drill cores and obtain pristine drill cores of key sedimentary successions from Brazil and Uruguay and develop new means to image and analyze chemical (major and trace elements) and isotope proxies (S, C, N, Fe, Mo, Cr) on the same samples at multiple scales (from the microfossil-scale to the sedimentary basin level) and degree of thermal overprint (from lower greenschist to amphibolite facies metamorphic conditions). The strong focus on linking multiple scales of observations, sedimentary and metamorphic history, and the use of state-of-the-art imaging and isotopic techniques makes the proposed work the first of its kind - and guarantees new insights into the history of life and oxygen on early Earth. This proposal will build upon previous and ongoing expertise of the applicants, who have been developing similar type of study in Australia during the last decade. Hence, this proposal represents a unique opportunity for Late Archean and Proterozoic paleoenvironmental and bio-geochemical reconstructions between South America and Australia. It will also be a large step forward in establishing leadership in imaging at hierarchical length-scales and analysis of bio-geochemical proxies in ancient settings. (AU)
Scientific publications
(13)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
MARIN-CARBONNE, JOHANNA;
BUSIGNY, VINCENT;
MIOT, JENNYFER;
ROLLION-BARD, CLAIRE;
MULLER, ELODIE;
DRABON, NADJA;
JACOB, DAMIEN;
PONT, SYLVAIN;
ROBYR, MARTIN;
BONTOGNALI, TOMASO R. R.;
FRANCOIS, CAMILLE;
REYNAUD, STEPHANIE;
VAN ZUILEN, MARK;
PHILIPPOT, PASCAL.
In Situ Fe and S isotope analyses in pyrite from the 3.2 Ga Mendon Formation (Barberton Greenstone Belt, South Africa): Evidence for early microbial iron reduction.
Geobiology,
v. 18,
n. 3
MAR 2020.
Web of Science Citations: 0.
DUCASSOU, C.;
MERCUZOT, M.;
BOURQUIN, S.;
ROSSIGNOL, C.;
PELLENARD, P.;
BECCALETTO, L.;
POUJOL, M.;
HALLOT, E.;
PIERSON-WICKMANN, A. C.;
HUE, C.;
RAVIER, E.
Sedimentology and U-Pb dating of Carboniferous to Permian continental series of the northern Massif Central (France): Local palaeogeographic evolution and larger scale correlations.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,
v. 533,
NOV 1 2019.
Web of Science Citations: 0.
LEPOT, KEVIN;
WILLIFORD, KENNETH H.;
PHILIPPOT, PASCAL;
THOMAZO, CHRISTOPHE;
USHIKUBO, TAKAYUKI;
KITAJIMA, KOUKI;
MOSTEFAOUI, SMAIL;
VALLEY, JOHN W.
Extreme C-13-depletions and organic sulfur content argue for S-fueled anaerobic methane oxidation in 2.72 Ga old stromatolites.
GEOCHIMICA ET COSMOCHIMICA ACTA,
v. 244,
p. 522-547,
JAN 1 2019.
Web of Science Citations: 3.
WANG, XIANGLI;
PLANAVSKY, NOAH J.;
HOFMANN, AXEL;
SAUPE, ERIN E.;
DE CORTE, BRIAN P.;
PHILIPPOT, PASCAL;
LALONDE, STEFAN V.;
JEMISON, NOAH E.;
ZOU, HUIJUAN;
OSSA, FRANTZ OSSA;
RYBACKI, KYLE;
ALFIMOVA, NADEZHDA;
LARSON, MATTHEW J.;
TSIKOS, HARILAOS;
FRALICK, PHILIP W.;
JOHNSON, THOMAS M.;
KNUDSEN, ANDREW C.;
REINHARD, CHRISTOPHER T.;
KONHAUSER, KURT O.
A Mesoarchean shift in uranium isotope systematics.
GEOCHIMICA ET COSMOCHIMICA ACTA,
v. 238,
p. 438-452,
OCT 1 2018.
Web of Science Citations: 9.
WARCHOLA, TYLER;
LALONDE, V, STEFAN;
PECOITS, ERNESTO;
VON GUNTEN, KONSTANTIN;
ROBBINS, LESLIE J.;
ALESSI, DANIEL S.;
PHILIPPOT, PASCAL;
KONHAUSER, KURT O.
Petrology and geochemistry of the Boolgeeda Iron Formation, Hamersley Basin, Western Australia.
Precambrian Research,
v. 316,
p. 155-173,
OCT 2018.
Web of Science Citations: 5.
PHILIPPOT, PASCAL;
AVILA, JANAINA N.;
KILLINGSWORTH, BRYAN A.;
TESSALINA, SVETLANA;
BATON, FRANCK;
CAQUINEAU, TOM;
MULLER, ELODIE;
PECOITS, ERNESTO;
CARTIGNY, PIERRE;
LALONDE, STEFAN V.;
IRELAND, TREVOR R.;
THOMAZO, CHRISTOPHE;
VAN KRANENDONK, MARTIN J.;
BUSIGNY, VINCENT.
Globally asynchronous sulphur isotope signals require re-definition of the Great Oxidation Event.
NATURE COMMUNICATIONS,
v. 9,
JUN 8 2018.
Web of Science Citations: 17.