Comparative Lower-Middle Ordovician conodont oxygen isotope palaeothermometry of the Argentine Precordillera and Laurentian margins
Stratigraphic, palaeontologic, and palaeomagnetic data support a hypothesis that argues for the Argentine Precordillera rifting from the southwestern margin of Laurentia in low latitudes during the Cambrian, migrating across the Iapetus Ocean, colliding with the Gondwanan margin in the late Middle O...
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ftconicet:oai:ri.conicet.gov.ar:11336/141462 2023-10-09T21:53:41+02:00 Comparative Lower-Middle Ordovician conodont oxygen isotope palaeothermometry of the Argentine Precordillera and Laurentian margins Albanesi, Guillermo Luis Barnes, Christopher R. Trotter, Julie A. Williams, Ian S. Bergström, Stig M. application/pdf http://hdl.handle.net/11336/141462 eng eng Elsevier Science info:eu-repo/semantics/altIdentifier/doi/10.1016/j.palaeo.2019.03.016 info:eu-repo/semantics/altIdentifier/url/www.sciencedirect.com/science/article/abs/pii/S0031018218302347 http://hdl.handle.net/11336/141462 Albanesi, Guillermo Luis; Barnes, Christopher R.; Trotter, Julie A.; Williams, Ian S.; Bergström, Stig M.; Comparative Lower-Middle Ordovician conodont oxygen isotope palaeothermometry of the Argentine Precordillera and Laurentian margins; Elsevier Science; Palaeogeography, Palaeoclimatology, Palaeoecology; 549; 7-2020; 1-13 0031-0182 CONICET Digital CONICET info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ Iapetus Ocean SHRIMP ion microprobe Cuyania Wilcox Pass Alberta Western Newfoundland Marathon area Texas https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.1016/j.palaeo.2019.03.016 2023-09-24T19:03:17Z Stratigraphic, palaeontologic, and palaeomagnetic data support a hypothesis that argues for the Argentine Precordillera rifting from the southwestern margin of Laurentia in low latitudes during the Cambrian, migrating across the Iapetus Ocean, colliding with the Gondwanan margin in the late Middle Ordovician, and receiving glaciogenic sediments in the Late Ordovician. An alternative model proposes that the Precordillera originated as a low-latitude segment of Gondwana, migrated southward through major transform faulting toward high latitudes in the late Middle Ordovician, to reach its present position in the Devonian. New conodont oxygen isotope compositions (δ18Ophos) have been determined by ion microprobe SHRIMP II using samples from both the Precordillera and Laurentia (Marathon area of Texas, Wilcox Pass in Alberta, and western Newfoundland). Significantly, the δ18O values of conodonts from all four widely separated areas show a consistent pattern of a cyclic but overall increasing trend in δ18O (ca. 16 to 18‰) hence ocean cooling through the Early and Middle Ordovician. An apparent change occurs at the basal Late Ordovician, where δ18O values obtained from conodonts in the uppermost sample from the Precordillera are significantly higher (+1.5‰) than those from Laurentia. Albeit from a single sample, this higher value implies significantly cooler conditions, as would be anticipated with a southerly (poleward) migration of the Precordillera (irrespective of either hypothesis). The virtual absence of conodont-bearing carbonates in most of the Precordilleran Upper Ordovician precluded analysis of younger samples. When combined with existing macrofaunal and palaeomagnetic data, the oxygen isotope data would tend to favour the model of a drift of the Precordillera from tropical to higher latitudes during the Ordovician; however, further studies are needed to determine unequivocally whether the Precordillera originated from southern Laurentia (Ouachita embayment). These new oxygen isotope values provide the best ... Article in Journal/Newspaper Newfoundland CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Argentine Wilcox ENVELOPE(-66.933,-66.933,-67.949,-67.949) Palaeogeography, Palaeoclimatology, Palaeoecology 549 109115 |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
Iapetus Ocean SHRIMP ion microprobe Cuyania Wilcox Pass Alberta Western Newfoundland Marathon area Texas https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
spellingShingle |
Iapetus Ocean SHRIMP ion microprobe Cuyania Wilcox Pass Alberta Western Newfoundland Marathon area Texas https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 Albanesi, Guillermo Luis Barnes, Christopher R. Trotter, Julie A. Williams, Ian S. Bergström, Stig M. Comparative Lower-Middle Ordovician conodont oxygen isotope palaeothermometry of the Argentine Precordillera and Laurentian margins |
topic_facet |
Iapetus Ocean SHRIMP ion microprobe Cuyania Wilcox Pass Alberta Western Newfoundland Marathon area Texas https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
description |
Stratigraphic, palaeontologic, and palaeomagnetic data support a hypothesis that argues for the Argentine Precordillera rifting from the southwestern margin of Laurentia in low latitudes during the Cambrian, migrating across the Iapetus Ocean, colliding with the Gondwanan margin in the late Middle Ordovician, and receiving glaciogenic sediments in the Late Ordovician. An alternative model proposes that the Precordillera originated as a low-latitude segment of Gondwana, migrated southward through major transform faulting toward high latitudes in the late Middle Ordovician, to reach its present position in the Devonian. New conodont oxygen isotope compositions (δ18Ophos) have been determined by ion microprobe SHRIMP II using samples from both the Precordillera and Laurentia (Marathon area of Texas, Wilcox Pass in Alberta, and western Newfoundland). Significantly, the δ18O values of conodonts from all four widely separated areas show a consistent pattern of a cyclic but overall increasing trend in δ18O (ca. 16 to 18‰) hence ocean cooling through the Early and Middle Ordovician. An apparent change occurs at the basal Late Ordovician, where δ18O values obtained from conodonts in the uppermost sample from the Precordillera are significantly higher (+1.5‰) than those from Laurentia. Albeit from a single sample, this higher value implies significantly cooler conditions, as would be anticipated with a southerly (poleward) migration of the Precordillera (irrespective of either hypothesis). The virtual absence of conodont-bearing carbonates in most of the Precordilleran Upper Ordovician precluded analysis of younger samples. When combined with existing macrofaunal and palaeomagnetic data, the oxygen isotope data would tend to favour the model of a drift of the Precordillera from tropical to higher latitudes during the Ordovician; however, further studies are needed to determine unequivocally whether the Precordillera originated from southern Laurentia (Ouachita embayment). These new oxygen isotope values provide the best ... |
format |
Article in Journal/Newspaper |
author |
Albanesi, Guillermo Luis Barnes, Christopher R. Trotter, Julie A. Williams, Ian S. Bergström, Stig M. |
author_facet |
Albanesi, Guillermo Luis Barnes, Christopher R. Trotter, Julie A. Williams, Ian S. Bergström, Stig M. |
author_sort |
Albanesi, Guillermo Luis |
title |
Comparative Lower-Middle Ordovician conodont oxygen isotope palaeothermometry of the Argentine Precordillera and Laurentian margins |
title_short |
Comparative Lower-Middle Ordovician conodont oxygen isotope palaeothermometry of the Argentine Precordillera and Laurentian margins |
title_full |
Comparative Lower-Middle Ordovician conodont oxygen isotope palaeothermometry of the Argentine Precordillera and Laurentian margins |
title_fullStr |
Comparative Lower-Middle Ordovician conodont oxygen isotope palaeothermometry of the Argentine Precordillera and Laurentian margins |
title_full_unstemmed |
Comparative Lower-Middle Ordovician conodont oxygen isotope palaeothermometry of the Argentine Precordillera and Laurentian margins |
title_sort |
comparative lower-middle ordovician conodont oxygen isotope palaeothermometry of the argentine precordillera and laurentian margins |
publisher |
Elsevier Science |
url |
http://hdl.handle.net/11336/141462 |
long_lat |
ENVELOPE(-66.933,-66.933,-67.949,-67.949) |
geographic |
Argentine Wilcox |
geographic_facet |
Argentine Wilcox |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.palaeo.2019.03.016 info:eu-repo/semantics/altIdentifier/url/www.sciencedirect.com/science/article/abs/pii/S0031018218302347 http://hdl.handle.net/11336/141462 Albanesi, Guillermo Luis; Barnes, Christopher R.; Trotter, Julie A.; Williams, Ian S.; Bergström, Stig M.; Comparative Lower-Middle Ordovician conodont oxygen isotope palaeothermometry of the Argentine Precordillera and Laurentian margins; Elsevier Science; Palaeogeography, Palaeoclimatology, Palaeoecology; 549; 7-2020; 1-13 0031-0182 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
op_doi |
https://doi.org/10.1016/j.palaeo.2019.03.016 |
container_title |
Palaeogeography, Palaeoclimatology, Palaeoecology |
container_volume |
549 |
container_start_page |
109115 |
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1779316988609298432 |