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

Al-Suwaidi, Aisha H.; Ruhl, Micha; Jenkyns, Hugh C.; Damborenea, Susana E.; Manceñido, Miguel O.; Condon, Daniel J.; Angelozzi, Gladys N.; Kamo, Sandra L.; Storm, Marisa; Riccardi, Alberto C.; Hesselbo, Stephen P.. 2022 New age constraints on the Lower Jurassic Pliensbachian–Toarcian Boundary at Chacay Melehue (Neuquén Basin, Argentina). Scientific Reports, 12 (1), 4975. 10.1038/s41598-022-07886-x

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Official URL: http://dx.doi.org/10.1038/s41598-022-07886-x

Abstract/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.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1038/s41598-022-07886-x
ISSN:	2045-2322
Date made live:	12 Apr 2022 13:49 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/532483

Item Type:

Publication - Article

Digital Object Identifier (DOI):

10.1038/s41598-022-07886-x

ISSN:

2045-2322

Date made live:

12 Apr 2022 13:49 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/532483