Resolution of U-Th-Pb isotope systems perturbations at the nanoscale in monazite from ultra-high temperature contexts (Antarctica, Madagascar, India)
This thesis focuses on the behavior of the mineral monazite (LREEPO4) which is used in geosciences for dating planetary events. This mineral integrates U and Th in its crystal lattice, which decay to Pb by radioactive decay over time. By measuring the isotopic compositions in U, Th and Pb in monazit...
Main Author: | |
---|---|
Other Authors: | , , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | French |
Published: |
HAL CCSD
2022
|
Subjects: | |
Online Access: | https://theses.hal.science/tel-04019471 https://theses.hal.science/tel-04019471/document https://theses.hal.science/tel-04019471/file/These-Turuani-Marion-2022.pdf |
id |
ftclermontuniv:oai:HAL:tel-04019471v1 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
HAL Clermont Auvergne (Université Blaise Pascal Clermont-Ferrand/Université d'Auvergne) |
op_collection_id |
ftclermontuniv |
language |
French |
topic |
Geochronology U-Th-Pb systems Isotope disruption Monazite Tomographic atom probe Transmission electron microscope Géochronologie Systèmes U-Th-Pb Perturbation isotopique Sonde atomique tomographique Microscope électronique en transmission [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Geochronology U-Th-Pb systems Isotope disruption Monazite Tomographic atom probe Transmission electron microscope Géochronologie Systèmes U-Th-Pb Perturbation isotopique Sonde atomique tomographique Microscope électronique en transmission [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Turuani, Marion Resolution of U-Th-Pb isotope systems perturbations at the nanoscale in monazite from ultra-high temperature contexts (Antarctica, Madagascar, India) |
topic_facet |
Geochronology U-Th-Pb systems Isotope disruption Monazite Tomographic atom probe Transmission electron microscope Géochronologie Systèmes U-Th-Pb Perturbation isotopique Sonde atomique tomographique Microscope électronique en transmission [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
This thesis focuses on the behavior of the mineral monazite (LREEPO4) which is used in geosciences for dating planetary events. This mineral integrates U and Th in its crystal lattice, which decay to Pb by radioactive decay over time. By measuring the isotopic compositions in U, Th and Pb in monazite, it is possible to calculate the age of crystallization of the mineral and to deduce the age of the rock or the geological events that affected it. However, it is frequent to observe perturbations in the isotopic signal, leading to the calculation of meaningless dates. To explain these perturbations, it is important to improve our knowledge of this mineral by taking as case studies Precambrian monazites from the Napier Complex (Antarctica), the Andriamena Unit (Madagascar) and the Kerala Khondalite Belt (India), where the U-Th-Pb signal is perturbed, giving a range of dates between two ages. In order to understand the origin of these perturbations, it is necessary to go down to the nanometric scale by coupling two analytical techniques; atom probe tomography (APT) which allows the acquisition of isotopic information at the atomic scale and transmission electron microscopy (TEM) which allows access to nano-structural information. This nanometric characterization of monazites reveals that the observed perturbations in the isotopic signal are due to the presence of Pb nano-phases in the monazite crystals. These results allow a new interpretation of the perturbations of the U-Th-Pb isotopic systems in monazite. Cette thèse s'intéresse aux comportements du minéral monazite (LREEPO4) qui est utilisé en géosciences pour la datation des évènements planétaires. Ce minéral intègre de l'U et Th dans son réseau cristallin qui au cours du temps se désintègrent en Pb par décroissance radioactive. En mesurant les compositions isotopiques en U, Th et Pb dans la monazite, il est possible de calculer l'âge de cristallisation du minéral et d'en déduire celui de la roche ou des évènements géologiques l'ayant affecté. Toutefois, il ... |
author2 |
Laboratoire Magmas et Volcans (LMV) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA) Université de Lyon Anne-Magali Seydoux-Guillaume Simon L. Harley |
format |
Doctoral or Postdoctoral Thesis |
author |
Turuani, Marion |
author_facet |
Turuani, Marion |
author_sort |
Turuani, Marion |
title |
Resolution of U-Th-Pb isotope systems perturbations at the nanoscale in monazite from ultra-high temperature contexts (Antarctica, Madagascar, India) |
title_short |
Resolution of U-Th-Pb isotope systems perturbations at the nanoscale in monazite from ultra-high temperature contexts (Antarctica, Madagascar, India) |
title_full |
Resolution of U-Th-Pb isotope systems perturbations at the nanoscale in monazite from ultra-high temperature contexts (Antarctica, Madagascar, India) |
title_fullStr |
Resolution of U-Th-Pb isotope systems perturbations at the nanoscale in monazite from ultra-high temperature contexts (Antarctica, Madagascar, India) |
title_full_unstemmed |
Resolution of U-Th-Pb isotope systems perturbations at the nanoscale in monazite from ultra-high temperature contexts (Antarctica, Madagascar, India) |
title_sort |
resolution of u-th-pb isotope systems perturbations at the nanoscale in monazite from ultra-high temperature contexts (antarctica, madagascar, india) |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://theses.hal.science/tel-04019471 https://theses.hal.science/tel-04019471/document https://theses.hal.science/tel-04019471/file/These-Turuani-Marion-2022.pdf |
long_lat |
ENVELOPE(-58.440,-58.440,-62.167,-62.167) |
geographic |
Napier |
geographic_facet |
Napier |
genre |
Antarc* Antarctica Antarctique* |
genre_facet |
Antarc* Antarctica Antarctique* |
op_source |
https://theses.hal.science/tel-04019471 Sciences de la Terre. Université de Lyon, 2022. Français. ⟨NNT : 2022LYSES019⟩ |
op_relation |
NNT: 2022LYSES019 tel-04019471 https://theses.hal.science/tel-04019471 https://theses.hal.science/tel-04019471/document https://theses.hal.science/tel-04019471/file/These-Turuani-Marion-2022.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1802644065949319168 |
spelling |
ftclermontuniv:oai:HAL:tel-04019471v1 2024-06-23T07:46:07+00:00 Resolution of U-Th-Pb isotope systems perturbations at the nanoscale in monazite from ultra-high temperature contexts (Antarctica, Madagascar, India) Résoudre les perturbations des systèmes isotopiques U-Th-Pb à l'échelle nanométrique dans les monazites de contextes de UHT (Antarctique, Madagascar, Inde) Turuani, Marion Laboratoire Magmas et Volcans (LMV) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA) Université de Lyon Anne-Magali Seydoux-Guillaume Simon L. Harley 2022-06-01 https://theses.hal.science/tel-04019471 https://theses.hal.science/tel-04019471/document https://theses.hal.science/tel-04019471/file/These-Turuani-Marion-2022.pdf fr fre HAL CCSD NNT: 2022LYSES019 tel-04019471 https://theses.hal.science/tel-04019471 https://theses.hal.science/tel-04019471/document https://theses.hal.science/tel-04019471/file/These-Turuani-Marion-2022.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-04019471 Sciences de la Terre. Université de Lyon, 2022. Français. ⟨NNT : 2022LYSES019⟩ Geochronology U-Th-Pb systems Isotope disruption Monazite Tomographic atom probe Transmission electron microscope Géochronologie Systèmes U-Th-Pb Perturbation isotopique Sonde atomique tomographique Microscope électronique en transmission [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/doctoralThesis Theses 2022 ftclermontuniv 2024-06-10T23:58:51Z This thesis focuses on the behavior of the mineral monazite (LREEPO4) which is used in geosciences for dating planetary events. This mineral integrates U and Th in its crystal lattice, which decay to Pb by radioactive decay over time. By measuring the isotopic compositions in U, Th and Pb in monazite, it is possible to calculate the age of crystallization of the mineral and to deduce the age of the rock or the geological events that affected it. However, it is frequent to observe perturbations in the isotopic signal, leading to the calculation of meaningless dates. To explain these perturbations, it is important to improve our knowledge of this mineral by taking as case studies Precambrian monazites from the Napier Complex (Antarctica), the Andriamena Unit (Madagascar) and the Kerala Khondalite Belt (India), where the U-Th-Pb signal is perturbed, giving a range of dates between two ages. In order to understand the origin of these perturbations, it is necessary to go down to the nanometric scale by coupling two analytical techniques; atom probe tomography (APT) which allows the acquisition of isotopic information at the atomic scale and transmission electron microscopy (TEM) which allows access to nano-structural information. This nanometric characterization of monazites reveals that the observed perturbations in the isotopic signal are due to the presence of Pb nano-phases in the monazite crystals. These results allow a new interpretation of the perturbations of the U-Th-Pb isotopic systems in monazite. Cette thèse s'intéresse aux comportements du minéral monazite (LREEPO4) qui est utilisé en géosciences pour la datation des évènements planétaires. Ce minéral intègre de l'U et Th dans son réseau cristallin qui au cours du temps se désintègrent en Pb par décroissance radioactive. En mesurant les compositions isotopiques en U, Th et Pb dans la monazite, il est possible de calculer l'âge de cristallisation du minéral et d'en déduire celui de la roche ou des évènements géologiques l'ayant affecté. Toutefois, il ... Doctoral or Postdoctoral Thesis Antarc* Antarctica Antarctique* HAL Clermont Auvergne (Université Blaise Pascal Clermont-Ferrand/Université d'Auvergne) Napier ENVELOPE(-58.440,-58.440,-62.167,-62.167) |