New age constraints on the Lower Jurassic Pliensbachian–Toarcian Boundary at Chacay Melehue (Neuquén Basin, Argentina)

The Pliensbachian–Toarcian boundary interval is characterized by a ~ 3‰ negative carbon-isotope excursion (CIE) in organic and inorganic marine and terrestrial archives from sections in Europe, such as Peniche (Portugal) and Hawsker Bottoms, Yorkshire (UK). A new high-resolution organic-carbon isoto...

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Bibliographic Details
Authors: Al Suwaidi, Aisha, Ruhl, Micha, Jenkyns, Hugh, Damborenea, Susana Ester, Manceñido, Miguel Oscar, Condon, Daniel J., Angelozzi, Gladys Noemí, Kamo, Sandra L., Storm, Marisa, Riccardi, Alberto Carlos, Hesselbo, Stephen P.
Format: article
Status:Published version
Publication Date:2022
Country:Argentina
Institution:Consejo Nacional de Investigaciones Científicas y Técnicas
Repository:CONICET Digital (CONICET)
Language:English
OAI Identifier:oai:ri.conicet.gov.ar:11336/188200
Online Access:http://hdl.handle.net/11336/188200
Access Level:Open access
Keyword:Pliensbachian?Toarcian
Carbon-Isotope Excursion
Neuquén Basin
Chemostratigraphy
Biostratigraphy
Geochronology
https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
Description
Summary:The Pliensbachian–Toarcian boundary interval is characterized by a ~ 3‰ negative carbon-isotope excursion (CIE) in organic and inorganic marine and terrestrial archives from sections in Europe, such as Peniche (Portugal) and Hawsker Bottoms, Yorkshire (UK). A new high-resolution organic-carbon isotope record, illustrating the same chemostratigraphic feature, is presented from the Southern Hemisphere Arroyo Chacay Melehue section, Chos Malal, Argentina, corroborating the global significance of this disturbance to the carbon cycle. The negative carbon-isotope excursion, mercury and organic-matter enrichment are accompanied by high-resolution ammonite and nannofossil biostratigraphy together with U–Pb CA-ID-TIMS geochronology derived from intercalated volcanic ash beds. A new age of ~ 183.73 + 0.35/− 0.50 Ma for the Pliensbachian–Toarcian boundary, and 182.77 + 0.11/− 0.15 for the tenuicostatum–serpentinum zonal boundary, is assigned based on high-precision U–Pb zircon geochronology and a Bayesian Markov chain Monte Carlo (MCMC) stratigraphic age model.

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