Carbon Isotopic Signature and Organic Matter Composition of Cenomanian High-Latitude Paleosols of Southern Patagonia

The Cenomanian Mata Amarilla Formation (MAF) in southern Patagonia (~55° S paleolatitude, Austral-Magallanes Basin, Argentina) is composed mainly of stacked fluvial deposits with intercalated paleosols, which document Cenomanian environments at high-paleolatitudes in the Southern Hemisphere. We perf...

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Autores principales: Varela, Augusto Nicolás, Raigemborn, María Sol, Santamarina, Patricio Emmanuel, Lizzoli, Sabrina, Adatte, Thierry, Heimhofer, Ulrich
Formato: Articulo
Lenguaje:Inglés
Publicado: 2021
Materias:
Geología
carbon isotopes
carbon cycle
terrestrial deposits
palynology
mid-cretaceous
Southern Gondwana
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/125607
https://www.mdpi.com/2076-3263/11/9/378
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-125607
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Geología
carbon isotopes
carbon cycle
terrestrial deposits
palynology
mid-cretaceous
Southern Gondwana
spellingShingle Geología
carbon isotopes
carbon cycle
terrestrial deposits
palynology
mid-cretaceous
Southern Gondwana
Varela, Augusto Nicolás
Raigemborn, María Sol
Santamarina, Patricio Emmanuel
Lizzoli, Sabrina
Adatte, Thierry
Heimhofer, Ulrich
Carbon Isotopic Signature and Organic Matter Composition of Cenomanian High-Latitude Paleosols of Southern Patagonia
topic_facet Geología
carbon isotopes
carbon cycle
terrestrial deposits
palynology
mid-cretaceous
Southern Gondwana
description The Cenomanian Mata Amarilla Formation (MAF) in southern Patagonia (~55° S paleolatitude, Austral-Magallanes Basin, Argentina) is composed mainly of stacked fluvial deposits with intercalated paleosols, which document Cenomanian environments at high-paleolatitudes in the Southern Hemisphere. We performed a multiproxy study of the paleosols and sediments of the MAF in order to (1) understand the composition of the soil- and sediment-derived organic matter (OM), (2) apply carbon isotope stratigraphy as a tool to correlate patterns obtained from the MAF with existing marine and non-marine δ13Corg records worldwide, and (3) investigate the relationship between variations in spore-pollen assemblages of the MAF and the climatic conditions prevailing in the Cenomanian Southern Hemisphere. An integrated dataset was generated, including total organic carbon content, Rock-Eval pyrolysis data, stable isotope (δ13Corg) composition, and palynological data, combined with published paleosol-derived mean annual temperatures and mean annual precipitations. The results indicated that the OM preserved in the MAF paleosols allowed its use as a chemostratigraphic tool. The MAF δ13Corg curve showed the rather stable pattern characteristic for the Early to Late Cenomanian interval. The absence of the major positive carbon isotope excursion associated with oceanic anoxic event 2 provided an upper limit for the stratigraphic range of the MAF. The palynological data suggested the development of fern prairies during warmer and moister periods at the expense of the background gymnosperm-dominated forests. Overall, the multiproxy record provided new insights into the long-term environmental conditions during the Cenomanian in the high latitudes of the Southern Hemisphere.
format Articulo
Articulo
author Varela, Augusto Nicolás
Raigemborn, María Sol
Santamarina, Patricio Emmanuel
Lizzoli, Sabrina
Adatte, Thierry
Heimhofer, Ulrich
author_facet Varela, Augusto Nicolás
Raigemborn, María Sol
Santamarina, Patricio Emmanuel
Lizzoli, Sabrina
Adatte, Thierry
Heimhofer, Ulrich
author_sort Varela, Augusto Nicolás
title Carbon Isotopic Signature and Organic Matter Composition of Cenomanian High-Latitude Paleosols of Southern Patagonia
title_short Carbon Isotopic Signature and Organic Matter Composition of Cenomanian High-Latitude Paleosols of Southern Patagonia
title_full Carbon Isotopic Signature and Organic Matter Composition of Cenomanian High-Latitude Paleosols of Southern Patagonia
title_fullStr Carbon Isotopic Signature and Organic Matter Composition of Cenomanian High-Latitude Paleosols of Southern Patagonia
title_full_unstemmed Carbon Isotopic Signature and Organic Matter Composition of Cenomanian High-Latitude Paleosols of Southern Patagonia
title_sort carbon isotopic signature and organic matter composition of cenomanian high-latitude paleosols of southern patagonia
publishDate 2021
url http://sedici.unlp.edu.ar/handle/10915/125607
https://www.mdpi.com/2076-3263/11/9/378
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