TY - JOUR
T1 - New age constraints on the Lower Jurassic Pliensbachian–Toarcian Boundary at Chacay Melehue (Neuquén Basin, Argentina)
AU - Al-Suwaidi, Aisha H.
AU - Ruhl, Micha
AU - Jenkyns, Hugh C.
AU - Damborenea, Susana E.
AU - Manceñido, Miguel O.
AU - Condon, Daniel J.
AU - Angelozzi, Gladys N.
AU - Kamo, Sandra L.
AU - Storm, Marisa
AU - Riccardi, Alberto C.
AU - Hesselbo, Stephen P.
N1 - Funding Information:
This research was made possible through financial contributions of the Scholarship Coordination Office, Abu Dhabi, United Arab Emirates and Khalifa University Grant CIRA-066-2019. We also acknowledge funding from Shell International Exploration & Production B.V., the Natural Environmental Research Council (NERC) (Grant Number NE/N018508/1) and NIGFSC facilities grant (IP-1466-0514), and, the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET, Argentina). Daniel Condon publishes with the approval of the Executive Director of the British Geological Survey (NERC). We thank Tamsin Mather for access to the Lumex Hg analyser at Oxford. This manuscript is a contribution to IGCP 655 (IUGS-UNESCO): Toarcian Oceanic Anoxic Event: Impact on marine carbon cycle and ecosystems, IGCP 632 (IUGS-UNESCO): Continental Crises of the Jurassic: Major Extinction events and Environmental Changes within Lacustrine Ecosystems, and IGCP 739 (IUGS-UNESCO): The Mesozoic–Paleogene Hyperthermal Events. We also thank Kevin Page for his help with ammonite biostratigraphy in the Mochras core.
Funding Information:
This research was made possible through financial contributions of the Scholarship Coordination Office, Abu Dhabi, United Arab Emirates?and Khalifa University Grant CIRA-066-2019. We also acknowledge funding from Shell International Exploration & Production B.V., the Natural Environmental Research Council (NERC) (Grant Number NE/N018508/1) and NIGFSC facilities grant (IP-1466-0514), and, the Consejo Nacional de Investigaciones Cient?ficas y T?cnicas (CONICET, Argentina). Daniel Condon publishes with the approval of the Executive Director of the British Geological Survey (NERC). We thank Tamsin Mather for access to the Lumex Hg analyser at Oxford. This manuscript is a contribution to IGCP 655 (IUGS-UNESCO): Toarcian Oceanic Anoxic Event: Impact on marine carbon cycle and ecosystems, IGCP 632 (IUGS-UNESCO): Continental Crises of the Jurassic: Major Extinction events and Environmental Changes within Lacustrine Ecosystems, and IGCP 739 (IUGS-UNESCO): The Mesozoic?Paleogene Hyperthermal Events. We also thank Kevin Page for his help with ammonite biostratigraphy in the Mochras core.
Publisher Copyright:
© 2022, The Author(s).
PY - 2022/12
Y1 - 2022/12
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85126890634&partnerID=8YFLogxK
U2 - 10.1038/s41598-022-07886-x
DO - 10.1038/s41598-022-07886-x
M3 - Article
C2 - 35322043
AN - SCOPUS:85126890634
SN - 2045-2322
VL - 12
JO - Scientific Reports
JF - Scientific Reports
IS - 1
M1 - 4975
ER -