Snapshots of pre-glacial paleoenvironmental conditions along the Sabrina Coast, East Antarctica: New palynological and biomarker evidence
The Aurora Subglacial Basin (ASB) catchment contains 3–5 m of sea-level equivalent ice volume that drains to the Sabrina Coast, East Antarctica via the Totten Glacier system. Observed thinning and retreat of Totten Glacier indicate regional sensitivity to oceanographic and atmospheric warming. Paleo...
Published in: | Geobios |
---|---|
Main Authors: | , , , , , , , , |
Other Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2022
|
Subjects: | |
Online Access: | https://hal.science/hal-04259511 https://hal.science/hal-04259511/document https://hal.science/hal-04259511/file/Duffy%20et%20al%202022%20-%20Geobios%20%28Accepted%20MS%29.pdf https://doi.org/10.1016/j.geobios.2021.09.001 |
id |
ftccsdartic:oai:HAL:hal-04259511v1 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
East Antarctica Paleogene Cretaceous Palynology Paleovegetation [SDE]Environmental Sciences |
spellingShingle |
East Antarctica Paleogene Cretaceous Palynology Paleovegetation [SDE]Environmental Sciences Duffy, Meghan Tibbett, Emily Smith, Catherine Warny, Sophie Feakins, Sarah Escarguel, Gilles Askin, Rosemary Leventer, Amy Shevenell, Amelia Snapshots of pre-glacial paleoenvironmental conditions along the Sabrina Coast, East Antarctica: New palynological and biomarker evidence |
topic_facet |
East Antarctica Paleogene Cretaceous Palynology Paleovegetation [SDE]Environmental Sciences |
description |
The Aurora Subglacial Basin (ASB) catchment contains 3–5 m of sea-level equivalent ice volume that drains to the Sabrina Coast, East Antarctica via the Totten Glacier system. Observed thinning and retreat of Totten Glacier indicate regional sensitivity to oceanographic and atmospheric warming. Paleoclimate studies of climatically sensitive catchments are required to understand the evolution of the East Antarctic Ice Sheet (EAIS) and its outlet glacier systems. Recent seismic and sediment studies from the Sabrina Coast document the evolution of the EAIS in the ASB catchment, suggesting that the region has long been sensitive to climatic changes. This study presents new palynological and biomarker data from Sabrina Coast continental shelf sediments. Detailed palynological records were obtained from four short jumbo piston cores (JPC; NBP14-02 JPC-30, -31, -54 and -55), enabling reconstructions of regional vegetation and environments prior to and during Cenozoic EAIS development. The Sabrina Flora is dominated by angiosperms, with Gambierina spp. often exceeding 40% of the assemblage, and diverse Proteaceae, Battenipollis spp., Forcipites spp., Nothofagidites spp., fern, and conifer palynomorphs indicative of an open shrubby ecosystem. Excellent preservation and frequent occurrence of Gambierina spp. clusters suggest that a majority of the Sabrina Flora assemblage is penecontemporaneous with sedimentation; however, some uncertainties remain whether this sedimentation occurred in the Late Cretaceous or the Paleogene. Despite that uncertainty, high abundances of Gambierina spp. and Battenipollis spp., in combination with relatively low (<10%) Nothofagidites spp. abundances indicate that the Sabrina Flora is unique in Antarctica. Evaluation of biomarkers finds evidence for penecontemporaneous and reworked compo- nents. The penecontemporaneous C30 n-alkanoic acids have d13C values of 30.2 ± 0.5‰, consistent with d13C values in an open canopy woodland or shrubby open vegetation. Their hydrogen isotope (dD) values of ... |
author2 |
Museum of Natural Science Louisiana State University (LSU) Department of Earth Sciences University of Southern California University of Southern California (USC) Department of Oceanography College Station Texas A&M University College Station Équipe 6 - Paléontologie, Paléoécologie, Paléobiogéographie, Évolution (P3E) Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés (LEHNA) Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Centre National de la Recherche Scientifique (CNRS) Colgate University |
format |
Article in Journal/Newspaper |
author |
Duffy, Meghan Tibbett, Emily Smith, Catherine Warny, Sophie Feakins, Sarah Escarguel, Gilles Askin, Rosemary Leventer, Amy Shevenell, Amelia |
author_facet |
Duffy, Meghan Tibbett, Emily Smith, Catherine Warny, Sophie Feakins, Sarah Escarguel, Gilles Askin, Rosemary Leventer, Amy Shevenell, Amelia |
author_sort |
Duffy, Meghan |
title |
Snapshots of pre-glacial paleoenvironmental conditions along the Sabrina Coast, East Antarctica: New palynological and biomarker evidence |
title_short |
Snapshots of pre-glacial paleoenvironmental conditions along the Sabrina Coast, East Antarctica: New palynological and biomarker evidence |
title_full |
Snapshots of pre-glacial paleoenvironmental conditions along the Sabrina Coast, East Antarctica: New palynological and biomarker evidence |
title_fullStr |
Snapshots of pre-glacial paleoenvironmental conditions along the Sabrina Coast, East Antarctica: New palynological and biomarker evidence |
title_full_unstemmed |
Snapshots of pre-glacial paleoenvironmental conditions along the Sabrina Coast, East Antarctica: New palynological and biomarker evidence |
title_sort |
snapshots of pre-glacial paleoenvironmental conditions along the sabrina coast, east antarctica: new palynological and biomarker evidence |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal.science/hal-04259511 https://hal.science/hal-04259511/document https://hal.science/hal-04259511/file/Duffy%20et%20al%202022%20-%20Geobios%20%28Accepted%20MS%29.pdf https://doi.org/10.1016/j.geobios.2021.09.001 |
long_lat |
ENVELOPE(118.550,118.550,-67.000,-67.000) ENVELOPE(116.333,116.333,-66.833,-66.833) |
geographic |
Antarctic East Antarctic Ice Sheet East Antarctica Sabrina Coast Totten Glacier |
geographic_facet |
Antarctic East Antarctic Ice Sheet East Antarctica Sabrina Coast Totten Glacier |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Totten Glacier |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Totten Glacier |
op_source |
ISSN: 0016-6995 Geobios https://hal.science/hal-04259511 Geobios, 2022, 70, pp.1-16. ⟨10.1016/j.geobios.2021.09.001⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.geobios.2021.09.001 hal-04259511 https://hal.science/hal-04259511 https://hal.science/hal-04259511/document https://hal.science/hal-04259511/file/Duffy%20et%20al%202022%20-%20Geobios%20%28Accepted%20MS%29.pdf doi:10.1016/j.geobios.2021.09.001 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.geobios.2021.09.001 |
container_title |
Geobios |
container_volume |
70 |
container_start_page |
1 |
op_container_end_page |
16 |
_version_ |
1790594697373155328 |
spelling |
ftccsdartic:oai:HAL:hal-04259511v1 2024-02-11T09:58:53+01:00 Snapshots of pre-glacial paleoenvironmental conditions along the Sabrina Coast, East Antarctica: New palynological and biomarker evidence Duffy, Meghan Tibbett, Emily Smith, Catherine Warny, Sophie Feakins, Sarah Escarguel, Gilles Askin, Rosemary Leventer, Amy Shevenell, Amelia Museum of Natural Science Louisiana State University (LSU) Department of Earth Sciences University of Southern California University of Southern California (USC) Department of Oceanography College Station Texas A&M University College Station Équipe 6 - Paléontologie, Paléoécologie, Paléobiogéographie, Évolution (P3E) Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés (LEHNA) Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Centre National de la Recherche Scientifique (CNRS) Colgate University 2022-02 https://hal.science/hal-04259511 https://hal.science/hal-04259511/document https://hal.science/hal-04259511/file/Duffy%20et%20al%202022%20-%20Geobios%20%28Accepted%20MS%29.pdf https://doi.org/10.1016/j.geobios.2021.09.001 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.geobios.2021.09.001 hal-04259511 https://hal.science/hal-04259511 https://hal.science/hal-04259511/document https://hal.science/hal-04259511/file/Duffy%20et%20al%202022%20-%20Geobios%20%28Accepted%20MS%29.pdf doi:10.1016/j.geobios.2021.09.001 info:eu-repo/semantics/OpenAccess ISSN: 0016-6995 Geobios https://hal.science/hal-04259511 Geobios, 2022, 70, pp.1-16. ⟨10.1016/j.geobios.2021.09.001⟩ East Antarctica Paleogene Cretaceous Palynology Paleovegetation [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2022 ftccsdartic https://doi.org/10.1016/j.geobios.2021.09.001 2024-01-20T23:55:43Z The Aurora Subglacial Basin (ASB) catchment contains 3–5 m of sea-level equivalent ice volume that drains to the Sabrina Coast, East Antarctica via the Totten Glacier system. Observed thinning and retreat of Totten Glacier indicate regional sensitivity to oceanographic and atmospheric warming. Paleoclimate studies of climatically sensitive catchments are required to understand the evolution of the East Antarctic Ice Sheet (EAIS) and its outlet glacier systems. Recent seismic and sediment studies from the Sabrina Coast document the evolution of the EAIS in the ASB catchment, suggesting that the region has long been sensitive to climatic changes. This study presents new palynological and biomarker data from Sabrina Coast continental shelf sediments. Detailed palynological records were obtained from four short jumbo piston cores (JPC; NBP14-02 JPC-30, -31, -54 and -55), enabling reconstructions of regional vegetation and environments prior to and during Cenozoic EAIS development. The Sabrina Flora is dominated by angiosperms, with Gambierina spp. often exceeding 40% of the assemblage, and diverse Proteaceae, Battenipollis spp., Forcipites spp., Nothofagidites spp., fern, and conifer palynomorphs indicative of an open shrubby ecosystem. Excellent preservation and frequent occurrence of Gambierina spp. clusters suggest that a majority of the Sabrina Flora assemblage is penecontemporaneous with sedimentation; however, some uncertainties remain whether this sedimentation occurred in the Late Cretaceous or the Paleogene. Despite that uncertainty, high abundances of Gambierina spp. and Battenipollis spp., in combination with relatively low (<10%) Nothofagidites spp. abundances indicate that the Sabrina Flora is unique in Antarctica. Evaluation of biomarkers finds evidence for penecontemporaneous and reworked compo- nents. The penecontemporaneous C30 n-alkanoic acids have d13C values of 30.2 ± 0.5‰, consistent with d13C values in an open canopy woodland or shrubby open vegetation. Their hydrogen isotope (dD) values of ... Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet Totten Glacier Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic East Antarctic Ice Sheet East Antarctica Sabrina Coast ENVELOPE(118.550,118.550,-67.000,-67.000) Totten Glacier ENVELOPE(116.333,116.333,-66.833,-66.833) Geobios 70 1 16 |