Artículo

Clyde, W.C.; Wilf, P.; Iglesias, A.; Slingerland, R.L.; Barnum, T.; Bijl, P.K.; Bralower, T.J.; Brinkhuis, H.; Comer, E.E.; Huber, B.T.; Ibañez-Mejia, M.; Jicha, B.R.; Krause, J.M.; Schueth, J.D.; Singer, B.S.; Raigemborn, M.S.; Schmitz, M.D.; Sluijs, A.; Zamaloa, M.C. "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" (2014) Bulletin of the Geological Society of America. 126(3-4):289-306
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Abstract:

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 Río 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 resolutionmulti collector-inductively coupled plasmamass spectrometry) U-Pb ages and a highresolution TIMS (thermal ionization mass spectrometry) age of 61.984 ± 0.041(0.074) [0.100] Ma for zircons from volcanic ash beds in the Peñas Coloradas Formation (Río Chico Group), and (4) paleomagnetic results indicating that the Salamanca Formation in this area is entirely of normal polarity, with reversals occurring in the Río 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 paleo botanical 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 Peñas Coloradas exposures are likely older than previously thought and correlate to the early Torrejonian and early Tiffanian North American Land Mammal Ages, respectively. © 2014 Geological Society of America.

Registro:

Documento: Artículo
Título: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
Autor:Clyde, W.C.; Wilf, P.; Iglesias, A.; Slingerland, R.L.; Barnum, T.; Bijl, P.K.; Bralower, T.J.; Brinkhuis, H.; Comer, E.E.; Huber, B.T.; Ibañez-Mejia, M.; Jicha, B.R.; Krause, J.M.; Schueth, J.D.; Singer, B.S.; Raigemborn, M.S.; Schmitz, M.D.; Sluijs, A.; Zamaloa, M.C.
Filiación:Department of Earth Sciences, University of New Hampshire, 56 College Road, Durham, NH 03824, United States
Department of Geosciences, Pennsylvania State University, University Park, PA 16802, United States
División Paleontología, Universidad Nacional del Comahue, Instituto de Investigaciones en Biodiversidad y Ambiente INIBIOMA-CONICET, San Carlos de Bariloche 8400, Río Negro, Argentina
Department of Earth Sciences, Faculty of Geosciences, Utrecht University Laboratory of Palaeobotany and Palynology, Budapestlaan 4, 3584 CD Utrecht, Netherlands
Department of Paleobiology, MRC NHB-121, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, United States
Department of Geosciences, University of Arizona, 1040 E. 4th Street, Tucson, AZ 85721, United States
Department of Geoscience, University of Wisconsin-Madison, 1215 W. Dayton Street, Madison, WI 53706, United States
Museo Paleontológico Egidio Feruglio (CONICET-UNPSJB), Av. Fontana 140, 9100 Trelew, Argentina
Centro de Investigaciones Geológicas (CONICET-UNLP), Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, La Plata 1900, Argentina
Department of Geosciences, Boise State University, 1910 University Drive, Boise, ID 83725, United States
Departamento de Ecología, Genética y Evolución, Universidad de Buenos Aires, Capital Federal, Buenos Aires C1428EHA, Argentina
Palabras clave:Electromagnetic induction; Inductively coupled plasma mass spectrometry; Lead; Mass spectrometers; Stratigraphy; Age determination; High resolution; Late cretaceous; North American; Southern Hemisphere; Thermal ionization mass spectrometry; Vertebrate fossils; Volcanic ash beds; Mammals; age determination; argon-argon dating; Cretaceous; geochronology; mammal; mass extinction; micropaleontology; paleobotany; Paleogene; paleomagnetism; stratigraphic correlation; uranium-lead dating; Argentina; Patagonia; San Jorge Basin; Mammalia; Vertebrata
Año:2014
Volumen:126
Número:3-4
Página de inicio:289
Página de fin:306
DOI: http://dx.doi.org/10.1130/B30915.1
Título revista:Bulletin of the Geological Society of America
Título revista abreviado:Bull. Geol. Soc. Am.
ISSN:00167606
CODEN:BUGMA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00167606_v126_n3-4_p289_Clyde

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Citas:

---------- APA ----------
Clyde, W.C., Wilf, P., Iglesias, A., Slingerland, R.L., Barnum, T., Bijl, P.K., Bralower, T.J.,..., Zamaloa, M.C. (2014) . 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. Bulletin of the Geological Society of America, 126(3-4), 289-306.
http://dx.doi.org/10.1130/B30915.1
---------- CHICAGO ----------
Clyde, W.C., Wilf, P., Iglesias, A., Slingerland, R.L., Barnum, T., Bijl, P.K., et al. "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" . Bulletin of the Geological Society of America 126, no. 3-4 (2014) : 289-306.
http://dx.doi.org/10.1130/B30915.1
---------- MLA ----------
Clyde, W.C., Wilf, P., Iglesias, A., Slingerland, R.L., Barnum, T., Bijl, P.K., et al. "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" . Bulletin of the Geological Society of America, vol. 126, no. 3-4, 2014, pp. 289-306.
http://dx.doi.org/10.1130/B30915.1
---------- VANCOUVER ----------
Clyde, W.C., Wilf, P., Iglesias, A., Slingerland, R.L., Barnum, T., Bijl, P.K., et al. 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. Bull. Geol. Soc. Am. 2014;126(3-4):289-306.
http://dx.doi.org/10.1130/B30915.1