Campanian-Eocene dinoflagellate cyst biostratigraphy in the Southern Andean foreland basin: Implications for Drake Passage throughflow
The tectonic opening of the Tasmanian Gateway and Drake Passage represented crucial geographic requirements for the Cenozoic development of the Antarctic Circumpolar Current (ACC). Particularly the tectonic complexity of Drake Passage has hampered the exact dating of the opening and deepening phases...
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ftconicet:oai:ri.conicet.gov.ar:11336/183897 2023-10-09T21:46:24+02:00 Campanian-Eocene dinoflagellate cyst biostratigraphy in the Southern Andean foreland basin: Implications for Drake Passage throughflow Bioestratigrafía de quistes dinoflagelados del Campaniano-Eoceno en la cuenca de antepaís de los Andes meridionales: Implicancias para la circulación oceánica a través del Pasaje de Drake Bijl, Peter K. Guerstein, Gladys Raquel Sanmiguel Jaimes, Edgar A. Sluijs, Appy Casadio, Silvio Alberto Valencia, Víctor Rodriguez Amenabar, Cecilia Encinas, Alfonso application/pdf http://hdl.handle.net/11336/183897 eng eng Servicio Nacional de Geología y Minería info:eu-repo/semantics/altIdentifier/doi/10.5027/andgeoV48n2-3339 info:eu-repo/semantics/altIdentifier/url/http://www.andeangeology.cl/index.php/revista1/article/view/V48n2-3339 http://hdl.handle.net/11336/183897 Bijl, Peter K.; Guerstein, Gladys Raquel; Sanmiguel Jaimes, Edgar A.; Sluijs, Appy; Casadio, Silvio Alberto; et al.; Campanian-Eocene dinoflagellate cyst biostratigraphy in the Southern Andean foreland basin: Implications for Drake Passage throughflow; Servicio Nacional de Geología y Minería; Andean Geology; 48; 2; 6-2021; 185-218 0718-7092 0718-7106 CONICET Digital CONICET info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/2.5/ar/ BIOSTRATIGRAPHY DINOFLAGELLATE CYSTS DRAKE PASSAGE ENDEMISM PALEOCEANOGRAPHY RADIOMETRIC DATING 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/10.5027/andgeoV48n2-3339 2023-09-24T20:07:27Z The tectonic opening of the Tasmanian Gateway and Drake Passage represented crucial geographic requirements for the Cenozoic development of the Antarctic Circumpolar Current (ACC). Particularly the tectonic complexity of Drake Passage has hampered the exact dating of the opening and deepening phases, and the consequential onset of throughflow of the ACC. One of the obstacles is putting key regional tectonic events, recorded in southern Patagonian sediments, in absolute time. For that purpose, we have collected Campanian-Eocene sediment samples from the Chilean sector of Southern Patagonia. Using U-Pb radiometric dating on zircons and dinoflagellate cyst biostratigraphy, we updated age constraints for the sedimentary formations, and the hiatuses in between. Thick sedimentary packages of shallow-marine and continental sediments were deposited in the foreland basin during the early Campanian, mid-Paleocene, the Paleocene-Eocene boundary interval and the middle Eocene, which represent phases of increased foreland subsidence. We interpret regional sedimentary hiatuses spanning the late Campanian, early-to mid-Paleocene, mid-Eocene and latest Eocene-early Oligocene to indicate times of reduced foreland subsidence, relative to sediment supply. We relate these changes to varying subduction rates and Andean orogeny. Dinoflagellate cyst assemblages suggest that the region was under the influence of the Antarctic-derived waters through the western boundary current of the Subpolar Gyre, developed in the southwest Atlantic Ocean and thus argues for limited throughflow through the Drake Passage until at least the latest Eocene. However, the proliferation of dinoflagellate endemism we record in the southwest Atlantic is coeval with that in the southwest Pacific, and on a species level, dinoflagellate cyst assemblages are the same in these two regions. This suggests that both regions were oceanographically connected throughout the early Paleogene, likely through a shallow opening of a restricted Drake Passage. This implies a ... Article in Journal/Newspaper Antarc* Antarctic Drake Passage CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Antarctic Drake Passage Pacific Pasaje ENVELOPE(-59.750,-59.750,-62.383,-62.383) Pasaje de Drake ENVELOPE(-60.000,-60.000,-60.000,-60.000) Patagonia The Antarctic Andean Geology 48 2 185 |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
BIOSTRATIGRAPHY DINOFLAGELLATE CYSTS DRAKE PASSAGE ENDEMISM PALEOCEANOGRAPHY RADIOMETRIC DATING https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
spellingShingle |
BIOSTRATIGRAPHY DINOFLAGELLATE CYSTS DRAKE PASSAGE ENDEMISM PALEOCEANOGRAPHY RADIOMETRIC DATING https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 Bijl, Peter K. Guerstein, Gladys Raquel Sanmiguel Jaimes, Edgar A. Sluijs, Appy Casadio, Silvio Alberto Valencia, Víctor Rodriguez Amenabar, Cecilia Encinas, Alfonso Campanian-Eocene dinoflagellate cyst biostratigraphy in the Southern Andean foreland basin: Implications for Drake Passage throughflow |
topic_facet |
BIOSTRATIGRAPHY DINOFLAGELLATE CYSTS DRAKE PASSAGE ENDEMISM PALEOCEANOGRAPHY RADIOMETRIC DATING https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
description |
The tectonic opening of the Tasmanian Gateway and Drake Passage represented crucial geographic requirements for the Cenozoic development of the Antarctic Circumpolar Current (ACC). Particularly the tectonic complexity of Drake Passage has hampered the exact dating of the opening and deepening phases, and the consequential onset of throughflow of the ACC. One of the obstacles is putting key regional tectonic events, recorded in southern Patagonian sediments, in absolute time. For that purpose, we have collected Campanian-Eocene sediment samples from the Chilean sector of Southern Patagonia. Using U-Pb radiometric dating on zircons and dinoflagellate cyst biostratigraphy, we updated age constraints for the sedimentary formations, and the hiatuses in between. Thick sedimentary packages of shallow-marine and continental sediments were deposited in the foreland basin during the early Campanian, mid-Paleocene, the Paleocene-Eocene boundary interval and the middle Eocene, which represent phases of increased foreland subsidence. We interpret regional sedimentary hiatuses spanning the late Campanian, early-to mid-Paleocene, mid-Eocene and latest Eocene-early Oligocene to indicate times of reduced foreland subsidence, relative to sediment supply. We relate these changes to varying subduction rates and Andean orogeny. Dinoflagellate cyst assemblages suggest that the region was under the influence of the Antarctic-derived waters through the western boundary current of the Subpolar Gyre, developed in the southwest Atlantic Ocean and thus argues for limited throughflow through the Drake Passage until at least the latest Eocene. However, the proliferation of dinoflagellate endemism we record in the southwest Atlantic is coeval with that in the southwest Pacific, and on a species level, dinoflagellate cyst assemblages are the same in these two regions. This suggests that both regions were oceanographically connected throughout the early Paleogene, likely through a shallow opening of a restricted Drake Passage. This implies a ... |
format |
Article in Journal/Newspaper |
author |
Bijl, Peter K. Guerstein, Gladys Raquel Sanmiguel Jaimes, Edgar A. Sluijs, Appy Casadio, Silvio Alberto Valencia, Víctor Rodriguez Amenabar, Cecilia Encinas, Alfonso |
author_facet |
Bijl, Peter K. Guerstein, Gladys Raquel Sanmiguel Jaimes, Edgar A. Sluijs, Appy Casadio, Silvio Alberto Valencia, Víctor Rodriguez Amenabar, Cecilia Encinas, Alfonso |
author_sort |
Bijl, Peter K. |
title |
Campanian-Eocene dinoflagellate cyst biostratigraphy in the Southern Andean foreland basin: Implications for Drake Passage throughflow |
title_short |
Campanian-Eocene dinoflagellate cyst biostratigraphy in the Southern Andean foreland basin: Implications for Drake Passage throughflow |
title_full |
Campanian-Eocene dinoflagellate cyst biostratigraphy in the Southern Andean foreland basin: Implications for Drake Passage throughflow |
title_fullStr |
Campanian-Eocene dinoflagellate cyst biostratigraphy in the Southern Andean foreland basin: Implications for Drake Passage throughflow |
title_full_unstemmed |
Campanian-Eocene dinoflagellate cyst biostratigraphy in the Southern Andean foreland basin: Implications for Drake Passage throughflow |
title_sort |
campanian-eocene dinoflagellate cyst biostratigraphy in the southern andean foreland basin: implications for drake passage throughflow |
publisher |
Servicio Nacional de Geología y Minería |
url |
http://hdl.handle.net/11336/183897 |
long_lat |
ENVELOPE(-59.750,-59.750,-62.383,-62.383) ENVELOPE(-60.000,-60.000,-60.000,-60.000) |
geographic |
Antarctic Drake Passage Pacific Pasaje Pasaje de Drake Patagonia The Antarctic |
geographic_facet |
Antarctic Drake Passage Pacific Pasaje Pasaje de Drake Patagonia The Antarctic |
genre |
Antarc* Antarctic Drake Passage |
genre_facet |
Antarc* Antarctic Drake Passage |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5027/andgeoV48n2-3339 info:eu-repo/semantics/altIdentifier/url/http://www.andeangeology.cl/index.php/revista1/article/view/V48n2-3339 http://hdl.handle.net/11336/183897 Bijl, Peter K.; Guerstein, Gladys Raquel; Sanmiguel Jaimes, Edgar A.; Sluijs, Appy; Casadio, Silvio Alberto; et al.; Campanian-Eocene dinoflagellate cyst biostratigraphy in the Southern Andean foreland basin: Implications for Drake Passage throughflow; Servicio Nacional de Geología y Minería; Andean Geology; 48; 2; 6-2021; 185-218 0718-7092 0718-7106 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/2.5/ar/ |
op_doi |
https://doi.org/10.5027/andgeoV48n2-3339 |
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Andean Geology |
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48 |
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