The Archean Earth as constrained by stable isotopes of transition metal (Zn, Fe)
During the Archean (4 to 2.5 Ga ago), the Earth experienced the biggest changes in terms of geological and biological settings – continental growth, transition from sagduction towards purely horizontal plate tectonics, emergence of life, … The purpose of the present study is to better understand the...
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ftccsdartic:oai:HAL:tel-00682665v1 2023-05-15T16:30:26+02:00 The Archean Earth as constrained by stable isotopes of transition metal (Zn, Fe) La Terre à l'Archéen. Apport des isotopes de métaux de transition (Zn, Fe) Pons, Marie-Laure Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement Lyon (LGL-TPE) Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon) Ecole normale supérieure de lyon - ENS LYON Francis Albarède 2011-12-16 https://tel.archives-ouvertes.fr/tel-00682665 https://tel.archives-ouvertes.fr/tel-00682665/document https://tel.archives-ouvertes.fr/tel-00682665/file/PONS_MarieLaure_2011_These.pdf fr fre HAL CCSD NNT: 2011ENSL0703 tel-00682665 https://tel.archives-ouvertes.fr/tel-00682665 https://tel.archives-ouvertes.fr/tel-00682665/document https://tel.archives-ouvertes.fr/tel-00682665/file/PONS_MarieLaure_2011_These.pdf info:eu-repo/semantics/OpenAccess https://tel.archives-ouvertes.fr/tel-00682665 Sciences de la Terre. Ecole normale supérieure de lyon - ENS LYON, 2011. Français. ⟨NNT : 2011ENSL0703⟩ Serpentinites Early life Early Earth Archean Stable isotopes Geochemistry Banded iron formations Formations de fer rubané Isua Serpentinite Zinc Vie primitive Terre primitive Archéen Isotopes stables Géochimie [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/doctoralThesis Theses 2011 ftccsdartic 2021-10-24T16:39:31Z During the Archean (4 to 2.5 Ga ago), the Earth experienced the biggest changes in terms of geological and biological settings – continental growth, transition from sagduction towards purely horizontal plate tectonics, emergence of life, … The purpose of the present study is to better understand the archean earth environment by measuring the isotopic composition of transition metals – Zn, Fe – of archean rocks. Most of the samples belong to the Isua supracrustal belt, in Greenland, dated 3.8 Ga. The chemical extraction protocol of Fe, Cu, Zn was adapted to our Fe-rich samples and isotopic analyses were conducted by multicollection inductively coupled plasma mass spectrometry. The serpentinization of the oceanic crust produces fuels for life (CH 4 , H 2 ) and mackinawite, which catalyses formation of complex organic compounds. Serpentinization may thus provide a suitable environment for the emergence of the first biomolecules. We analysed the oldest known serpentinites from Isua (3.81-3.70 Ga) to comprehend the archean serpentinization process. The isotopic compositions of zinc reported in this samples and in modern serpentinites attest to a strong similarity between Isua and the Mariana serpentinite mud volcanoes. We identified Isua as an oceanic forearc environment permeated by high-pH (9-12) hydrothermal solutions at medium temperature (100-300°C). We show that such an environment could have fostered the emergence of early life. We also analyzed several banded iron formations (BIF), which are sediments limited to the Archean and Proterozoic. The temporal evolution of these samples' isotopic composition shows a close relationship with the continental freeboard. Our results support the continental emersion starting 2.9 Ga ago. Besides, we identified the life colonization of continents at 2.6 Ga together with pedogenesis of archean soils with an organic horizon. L’Archéen, de 4 à 2,5 Ga, est la période qui a connu les plus grands bouleversements géologiques et biologiques de l’histoire de la Terre : formation ... Doctoral or Postdoctoral Thesis Greenland Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Greenland |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
French |
topic |
Serpentinites Early life Early Earth Archean Stable isotopes Geochemistry Banded iron formations Formations de fer rubané Isua Serpentinite Zinc Vie primitive Terre primitive Archéen Isotopes stables Géochimie [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Serpentinites Early life Early Earth Archean Stable isotopes Geochemistry Banded iron formations Formations de fer rubané Isua Serpentinite Zinc Vie primitive Terre primitive Archéen Isotopes stables Géochimie [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Pons, Marie-Laure The Archean Earth as constrained by stable isotopes of transition metal (Zn, Fe) |
topic_facet |
Serpentinites Early life Early Earth Archean Stable isotopes Geochemistry Banded iron formations Formations de fer rubané Isua Serpentinite Zinc Vie primitive Terre primitive Archéen Isotopes stables Géochimie [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
During the Archean (4 to 2.5 Ga ago), the Earth experienced the biggest changes in terms of geological and biological settings – continental growth, transition from sagduction towards purely horizontal plate tectonics, emergence of life, … The purpose of the present study is to better understand the archean earth environment by measuring the isotopic composition of transition metals – Zn, Fe – of archean rocks. Most of the samples belong to the Isua supracrustal belt, in Greenland, dated 3.8 Ga. The chemical extraction protocol of Fe, Cu, Zn was adapted to our Fe-rich samples and isotopic analyses were conducted by multicollection inductively coupled plasma mass spectrometry. The serpentinization of the oceanic crust produces fuels for life (CH 4 , H 2 ) and mackinawite, which catalyses formation of complex organic compounds. Serpentinization may thus provide a suitable environment for the emergence of the first biomolecules. We analysed the oldest known serpentinites from Isua (3.81-3.70 Ga) to comprehend the archean serpentinization process. The isotopic compositions of zinc reported in this samples and in modern serpentinites attest to a strong similarity between Isua and the Mariana serpentinite mud volcanoes. We identified Isua as an oceanic forearc environment permeated by high-pH (9-12) hydrothermal solutions at medium temperature (100-300°C). We show that such an environment could have fostered the emergence of early life. We also analyzed several banded iron formations (BIF), which are sediments limited to the Archean and Proterozoic. The temporal evolution of these samples' isotopic composition shows a close relationship with the continental freeboard. Our results support the continental emersion starting 2.9 Ga ago. Besides, we identified the life colonization of continents at 2.6 Ga together with pedogenesis of archean soils with an organic horizon. L’Archéen, de 4 à 2,5 Ga, est la période qui a connu les plus grands bouleversements géologiques et biologiques de l’histoire de la Terre : formation ... |
author2 |
Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement Lyon (LGL-TPE) Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon) Ecole normale supérieure de lyon - ENS LYON Francis Albarède |
format |
Doctoral or Postdoctoral Thesis |
author |
Pons, Marie-Laure |
author_facet |
Pons, Marie-Laure |
author_sort |
Pons, Marie-Laure |
title |
The Archean Earth as constrained by stable isotopes of transition metal (Zn, Fe) |
title_short |
The Archean Earth as constrained by stable isotopes of transition metal (Zn, Fe) |
title_full |
The Archean Earth as constrained by stable isotopes of transition metal (Zn, Fe) |
title_fullStr |
The Archean Earth as constrained by stable isotopes of transition metal (Zn, Fe) |
title_full_unstemmed |
The Archean Earth as constrained by stable isotopes of transition metal (Zn, Fe) |
title_sort |
archean earth as constrained by stable isotopes of transition metal (zn, fe) |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://tel.archives-ouvertes.fr/tel-00682665 https://tel.archives-ouvertes.fr/tel-00682665/document https://tel.archives-ouvertes.fr/tel-00682665/file/PONS_MarieLaure_2011_These.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
https://tel.archives-ouvertes.fr/tel-00682665 Sciences de la Terre. Ecole normale supérieure de lyon - ENS LYON, 2011. Français. ⟨NNT : 2011ENSL0703⟩ |
op_relation |
NNT: 2011ENSL0703 tel-00682665 https://tel.archives-ouvertes.fr/tel-00682665 https://tel.archives-ouvertes.fr/tel-00682665/document https://tel.archives-ouvertes.fr/tel-00682665/file/PONS_MarieLaure_2011_These.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766020156053520384 |