New age constraints for the Salamanca Formation and lower Río Chico Group in the western San Jorge Basin, Patagonia, Argentina: Implications for Cretaceous-Paleogene extinction recovery and land mammal age correlations

The Salamanca Formation of the San Jorge Basin (Patagonia, Argentina) preserves critical records of Southern Hemisphere Paleocene biotas, but its age remains poorly resolved, with estimates ranging from Late Cretaceous to middle Paleocene. We report a multi-disciplinary geochronologic study of the S...

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Detalles Bibliográficos
Autores principales: Clyde, William C., Wilf, Peter, Iglesias, Ari, Slingerland, Rudy, Barnum, Timothy, Bijl, Peter K, Bralower, Timothy J., Brinkhuis, Henk, Comer, Emily E., Huber, Brian T., Ibanez Mejia, Mauricio, Jicha, Brian R., Krause, Javier Marcelo, Schueth, Jonathan D., Singer, Bradley S., Raigemborn, María Sol, Schmitz, Mark D., Sluijs, Appy, Zamaloa, María del Carmen
Formato: Articulo
Lenguaje:Inglés
Publicado: 2014
Materias:
Geología
Cretaceous
Geology
Paleontology
Paleomagnetism
Geochronology
Paleogene
Southern hemisphere
Carodnia
Paleosol
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/126256
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-126256
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
Cretaceous
Geology
Paleontology
Paleomagnetism
Geochronology
Paleogene
Southern hemisphere
Carodnia
Paleosol
spellingShingle Geología
Cretaceous
Geology
Paleontology
Paleomagnetism
Geochronology
Paleogene
Southern hemisphere
Carodnia
Paleosol
Clyde, William C.
Wilf, Peter
Iglesias, Ari
Slingerland, Rudy
Barnum, Timothy
Bijl, Peter K
Bralower, Timothy J.
Brinkhuis, Henk
Comer, Emily E.
Huber, Brian T.
Ibanez Mejia, Mauricio
Jicha, Brian R.
Krause, Javier Marcelo
Schueth, Jonathan D.
Singer, Bradley S.
Raigemborn, María Sol
Schmitz, Mark D.
Sluijs, Appy
Zamaloa, María del Carmen
New age constraints for the Salamanca Formation and lower Río Chico Group in the western San Jorge Basin, Patagonia, Argentina: Implications for Cretaceous-Paleogene extinction recovery and land mammal age correlations
topic_facet Geología
Cretaceous
Geology
Paleontology
Paleomagnetism
Geochronology
Paleogene
Southern hemisphere
Carodnia
Paleosol
description The Salamanca Formation of the San Jorge Basin (Patagonia, Argentina) preserves critical records of Southern Hemisphere Paleocene biotas, but its age remains poorly resolved, with estimates ranging from Late Cretaceous to middle Paleocene. We report a multi-disciplinary geochronologic study of the Salamanca Formation and overlying Rio Chico Group in the western part of the basin. New constraints include (1) an 40Ar/39Ar age determination of 67.31 ± 0.55 Ma from a basalt flow underlying the Salamanca Formation, (2) micropaleontological results indicating an early Danian age for the base of the Salamanca Formation, (3) laser ablation HR-MC-ICP-MS (high resolution-multi collector-inductively coupled plasma-mass spectrometry) U-Pb ages and a high-resolution TIMS (thermal ionization mass spectrometry) age of 61.984 ± 0.041(0.074)[0.100] Ma for zircons from volcanic ash beds in the Penas Coloradas Formation (Rio Chico Group), and (4) paleomagnetic results indicating that the Salamanca Formation in this area is entirely of normal polarity, with reversals occurring in the Rio Chico Group. Placing these new age constraints in the context of a sequence stratigraphic model for the basin, we correlate the Salamanca Formation in the study area to Chrons C29n and C28n, with the Banco Negro Inferior (BNI), a mature widespread fossiliferous paleosol unit at the top of the Salamanca Formation, corresponding to the top of Chron C28n. The diverse paleobotanical assemblages from this area are here assigned to C28n (64.67–63.49 Ma), ∼2–3 million years older than previously thought, adding to growing evidence for rapid Southern Hemisphere floral recovery after the Cretaceous-Paleogene extinction. Important Peligran and “Carodnia” zone vertebrate fossil assemblages from coastal BNI and Penas Coloradas exposures are likely older than previously thought and correlate to the early Torrejonian and early Tiffanian North American Land Mammal Ages, respectively.
format Articulo
Articulo
author Clyde, William C.
Wilf, Peter
Iglesias, Ari
Slingerland, Rudy
Barnum, Timothy
Bijl, Peter K
Bralower, Timothy J.
Brinkhuis, Henk
Comer, Emily E.
Huber, Brian T.
Ibanez Mejia, Mauricio
Jicha, Brian R.
Krause, Javier Marcelo
Schueth, Jonathan D.
Singer, Bradley S.
Raigemborn, María Sol
Schmitz, Mark D.
Sluijs, Appy
Zamaloa, María del Carmen
author_facet Clyde, William C.
Wilf, Peter
Iglesias, Ari
Slingerland, Rudy
Barnum, Timothy
Bijl, Peter K
Bralower, Timothy J.
Brinkhuis, Henk
Comer, Emily E.
Huber, Brian T.
Ibanez Mejia, Mauricio
Jicha, Brian R.
Krause, Javier Marcelo
Schueth, Jonathan D.
Singer, Bradley S.
Raigemborn, María Sol
Schmitz, Mark D.
Sluijs, Appy
Zamaloa, María del Carmen
author_sort Clyde, William C.
title New age constraints for the Salamanca Formation and lower Río Chico Group in the western San Jorge Basin, Patagonia, Argentina: Implications for Cretaceous-Paleogene extinction recovery and land mammal age correlations
title_short New age constraints for the Salamanca Formation and lower Río Chico Group in the western San Jorge Basin, Patagonia, Argentina: Implications for Cretaceous-Paleogene extinction recovery and land mammal age correlations
title_full New age constraints for the Salamanca Formation and lower Río Chico Group in the western San Jorge Basin, Patagonia, Argentina: Implications for Cretaceous-Paleogene extinction recovery and land mammal age correlations
title_fullStr New age constraints for the Salamanca Formation and lower Río Chico Group in the western San Jorge Basin, Patagonia, Argentina: Implications for Cretaceous-Paleogene extinction recovery and land mammal age correlations
title_full_unstemmed New age constraints for the Salamanca Formation and lower Río Chico Group in the western San Jorge Basin, Patagonia, Argentina: Implications for Cretaceous-Paleogene extinction recovery and land mammal age correlations
title_sort new age constraints for the salamanca formation and lower río chico group in the western san jorge basin, patagonia, argentina: implications for cretaceous-paleogene extinction recovery and land mammal age correlations
publishDate 2014
url http://sedici.unlp.edu.ar/handle/10915/126256
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