Structural and chemical heterogeneity of Proterozoic organic microfossils of the ca. 1 Ga old Angmaat Formation, Baffin Island, Canada
International audience Organic microfossils in Meso-and Neoproterozoic rocks are of key importance to track the emergence and evolution of eukaryotic life. An increasing number of studies combine Raman spectroscopy with synchrotron-based methods to characterize these microfossils. A recurring observ...
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ftunivtcompiegne:oai:HAL:hal-03426869v1 2023-05-15T15:35:25+02:00 Structural and chemical heterogeneity of Proterozoic organic microfossils of the ca. 1 Ga old Angmaat Formation, Baffin Island, Canada Nabhan, Sami Kah, Linda, Mishra, Bhoopesh Pollok, Kilian Manning‐berg, Ashley, Zuilen, Mark Institut de Physique du Globe de Paris (IPGP (UMR_7154)) Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) The University of Tennessee Knoxville School of Chemical and Process Engineering University of Leeds Friedrich-Schiller-Universität = Friedrich Schiller University Jena Jena, Germany University of Tennessee Chattanooga (UTC) 2021 https://hal.science/hal-03426869 https://hal.science/hal-03426869/document https://hal.science/hal-03426869/file/Nabhan-2021-Geobiology-pre-proof.pdf https://doi.org/10.1111/gbi.12463 en eng HAL CCSD Wiley info:eu-repo/semantics/altIdentifier/doi/10.1111/gbi.12463 hal-03426869 https://hal.science/hal-03426869 https://hal.science/hal-03426869/document https://hal.science/hal-03426869/file/Nabhan-2021-Geobiology-pre-proof.pdf doi:10.1111/gbi.12463 info:eu-repo/semantics/OpenAccess ISSN: 1472-4677 EISSN: 1472-4669 Geobiology https://hal.science/hal-03426869 Geobiology, 2021, 19 (6), pp.557 - 584. ⟨10.1111/gbi.12463⟩ Mesoproterozoic organic microfossils Angmaat Formation Raman-spectroscopy [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry info:eu-repo/semantics/article Journal articles 2021 ftunivtcompiegne https://doi.org/10.1111/gbi.12463 2023-03-15T17:19:52Z International audience Organic microfossils in Meso-and Neoproterozoic rocks are of key importance to track the emergence and evolution of eukaryotic life. An increasing number of studies combine Raman spectroscopy with synchrotron-based methods to characterize these microfossils. A recurring observation is that Raman spectra of organic microfossils. A recurring observation is that Raman spectra of organic microfossils show negligible variation on a sample scale and that variation between different samples can be explained by differences in thermal maturation or in the biologic origin of organic precursor material. There is a paucity of work, however, that explores the extent to which the petrographic framework and diagenetic processes might in-fluence the chemical structure of organic materials. We present a detailed Raman spectroscopy- based study of a complex organic microfossil assemblage in the ca. 1 Ga old Angmaat Formation, Baffin Island, Canada. This formation contains abundant early diagenetic chert that preserves silicified microbial mats with numerous, readily identifiable organic microfossils. Individual chert beds show petrographic differences with discrete episodes of cementation and recrystallization. Raman spectroscopy reveals measurable variation of organic maturity between samples and between neigh-boring organic microfossils of the same taxonomy and taphonomic state. Scanning transmission X- ray microscopy performed on taphonomically similar coccoidal micro-fossils from the same thin section shows distinct chemical compositions, with varying ratios of aromatic compounds to ketones and phenols. Such observations imply that geochemical variation of organic matter is not necessarily coupled to thermal alteration or organic precursor material. Variation of the Raman signal across single samples is most likely linked to the diagenetic state of analyzed materials and implies an association between organic preservation and access to diagenetic fluids. Variation in the maturity of individual ... Article in Journal/Newspaper Baffin Island Baffin Université de Technologie de Compiègne: HAL Baffin Island Canada Geobiology 19 6 557 584 |
institution |
Open Polar |
collection |
Université de Technologie de Compiègne: HAL |
op_collection_id |
ftunivtcompiegne |
language |
English |
topic |
Mesoproterozoic organic microfossils Angmaat Formation Raman-spectroscopy [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
spellingShingle |
Mesoproterozoic organic microfossils Angmaat Formation Raman-spectroscopy [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Nabhan, Sami Kah, Linda, Mishra, Bhoopesh Pollok, Kilian Manning‐berg, Ashley, Zuilen, Mark Structural and chemical heterogeneity of Proterozoic organic microfossils of the ca. 1 Ga old Angmaat Formation, Baffin Island, Canada |
topic_facet |
Mesoproterozoic organic microfossils Angmaat Formation Raman-spectroscopy [SDU.STU.PG]Sciences of the Universe [physics]/Earth Sciences/Paleontology [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry |
description |
International audience Organic microfossils in Meso-and Neoproterozoic rocks are of key importance to track the emergence and evolution of eukaryotic life. An increasing number of studies combine Raman spectroscopy with synchrotron-based methods to characterize these microfossils. A recurring observation is that Raman spectra of organic microfossils. A recurring observation is that Raman spectra of organic microfossils show negligible variation on a sample scale and that variation between different samples can be explained by differences in thermal maturation or in the biologic origin of organic precursor material. There is a paucity of work, however, that explores the extent to which the petrographic framework and diagenetic processes might in-fluence the chemical structure of organic materials. We present a detailed Raman spectroscopy- based study of a complex organic microfossil assemblage in the ca. 1 Ga old Angmaat Formation, Baffin Island, Canada. This formation contains abundant early diagenetic chert that preserves silicified microbial mats with numerous, readily identifiable organic microfossils. Individual chert beds show petrographic differences with discrete episodes of cementation and recrystallization. Raman spectroscopy reveals measurable variation of organic maturity between samples and between neigh-boring organic microfossils of the same taxonomy and taphonomic state. Scanning transmission X- ray microscopy performed on taphonomically similar coccoidal micro-fossils from the same thin section shows distinct chemical compositions, with varying ratios of aromatic compounds to ketones and phenols. Such observations imply that geochemical variation of organic matter is not necessarily coupled to thermal alteration or organic precursor material. Variation of the Raman signal across single samples is most likely linked to the diagenetic state of analyzed materials and implies an association between organic preservation and access to diagenetic fluids. Variation in the maturity of individual ... |
author2 |
Institut de Physique du Globe de Paris (IPGP (UMR_7154)) Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) The University of Tennessee Knoxville School of Chemical and Process Engineering University of Leeds Friedrich-Schiller-Universität = Friedrich Schiller University Jena Jena, Germany University of Tennessee Chattanooga (UTC) |
format |
Article in Journal/Newspaper |
author |
Nabhan, Sami Kah, Linda, Mishra, Bhoopesh Pollok, Kilian Manning‐berg, Ashley, Zuilen, Mark |
author_facet |
Nabhan, Sami Kah, Linda, Mishra, Bhoopesh Pollok, Kilian Manning‐berg, Ashley, Zuilen, Mark |
author_sort |
Nabhan, Sami |
title |
Structural and chemical heterogeneity of Proterozoic organic microfossils of the ca. 1 Ga old Angmaat Formation, Baffin Island, Canada |
title_short |
Structural and chemical heterogeneity of Proterozoic organic microfossils of the ca. 1 Ga old Angmaat Formation, Baffin Island, Canada |
title_full |
Structural and chemical heterogeneity of Proterozoic organic microfossils of the ca. 1 Ga old Angmaat Formation, Baffin Island, Canada |
title_fullStr |
Structural and chemical heterogeneity of Proterozoic organic microfossils of the ca. 1 Ga old Angmaat Formation, Baffin Island, Canada |
title_full_unstemmed |
Structural and chemical heterogeneity of Proterozoic organic microfossils of the ca. 1 Ga old Angmaat Formation, Baffin Island, Canada |
title_sort |
structural and chemical heterogeneity of proterozoic organic microfossils of the ca. 1 ga old angmaat formation, baffin island, canada |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.science/hal-03426869 https://hal.science/hal-03426869/document https://hal.science/hal-03426869/file/Nabhan-2021-Geobiology-pre-proof.pdf https://doi.org/10.1111/gbi.12463 |
geographic |
Baffin Island Canada |
geographic_facet |
Baffin Island Canada |
genre |
Baffin Island Baffin |
genre_facet |
Baffin Island Baffin |
op_source |
ISSN: 1472-4677 EISSN: 1472-4669 Geobiology https://hal.science/hal-03426869 Geobiology, 2021, 19 (6), pp.557 - 584. ⟨10.1111/gbi.12463⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1111/gbi.12463 hal-03426869 https://hal.science/hal-03426869 https://hal.science/hal-03426869/document https://hal.science/hal-03426869/file/Nabhan-2021-Geobiology-pre-proof.pdf doi:10.1111/gbi.12463 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1111/gbi.12463 |
container_title |
Geobiology |
container_volume |
19 |
container_issue |
6 |
container_start_page |
557 |
op_container_end_page |
584 |
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