Abstract
The Upper Triassic Chinle Formation, cropping out in and around Petrified Forest National Park (PFNP) in northern Arizona, U.S.A., preserves an important non-marine biotic and sedimentologic record of Late Triassic key Earth-life events. In 2013, the Colorado Plateau Coring Project (CPCP) obtained a 520-m-long core of the Triassic strata at PFNP to study this sedimentary record in unequivocal superposition and, among other goals, to test hypotheses about the paleoenvironmental and biotic changes preserved in the Sonsela Member of the Chinle Formation, and specifically their link to the Manicouagan impact and the Adamanian-Revueltian biotic turnover event (A-R transition). We sampled the Sonsela Member of CPCP core 1A for bulk organic material and for pedogenic carbonates to establish the δ13Corg, δ13Ccarb, and δ18Ocarb records. Throughout much of the Sonsela Member, the stable isotope record is characterized by a relatively narrow range of values (δ13Corg = ~ −25 to −30‰; δ13Ccarb = ~ −7 to −10‰; and δ18Ocarb = ~ −5 to −8‰). Based on these data, we estimate mean annual precipitation and correlate our isotope record to two previously developed, high resolution, multi-proxy age models for the CPCP core. Our new data set supports three main conclusions based on these observations: (1) whereas the A-R transition and the Manicouagan impact event might correlate in time, establishing a causal relationship between those two events remains challenging; (2) the Manicouagan impact as well as the A-R transition are not linked to a clear geochemical perturbation preserved in the CPCP core; and (3) multiple proxies agree the climate became more arid throughout the Sonsela Member, possibly contributing to the Adamanian-Revueltian biotic turnover.
Original language | English (US) |
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Article number | 111060 |
Journal | Palaeogeography, Palaeoclimatology, Palaeoecology |
Volume | 601 |
DOIs | |
State | Published - Sep 1 2022 |
Bibliographical note
Funding Information:This project was funded by National Science Foundation (NSF) collaborative grants EAR 0958915 (to Randall B. Irmis), 0958976 (to Paul E. Olsen and John W. Geissman), and 0958723 (to Roland Mundil). Paul E. Olsen acknowledges support from the Lamont Climate Center , and Roland Mundil acknowledges support of the Ann and Gordon Getty Foundation . A special thanks goes to the National Park Service, particularly superintendent Brad Traver, for permission to core in the park and for logistical support during site selection and drilling. On-site and laboratory core processing, scanning, and archiving were carried out by LacCore, and we specifically thank Anders Noren, Kristina Brady, and Ryan O'Grady as well as the on-site core handling volunteers Justin Clifton, Bob Graves, Ed Lamb, Max Schnurrenberger, and Riley Black for their exceptional around-the-clock efforts, and drilling manager Doug Schnurrenberger for overseeing an excellent-run coring project. Curatorial facilities for the work halves of the CPCP cores are provided by the Rutgers Core Repository. Cornelia Rasmussen thanks her Ph.D. committee members: Thure Cerling, Gabriel Bowen, and Peter Lippert for their helpful comments on an early version of this manuscript. We thank editor Dr. Shucheng Xie and the reviewer Dr. Yadong Sun as well as one anonymous reviewer for their helpful comments that improved the manuscript. This is Petrified Forest Paleontological Contribution No. 85. The views expressed herein are those of the authors and do not represent those of the United States government.
Funding Information:
This project was funded by National Science Foundation (NSF) collaborative grants EAR 0958915 (to Randall B. Irmis), 0958976 (to Paul E. Olsen and John W. Geissman), and 0958723 (to Roland Mundil). Paul E. Olsen acknowledges support from the Lamont Climate Center, and Roland Mundil acknowledges support of the Ann and Gordon Getty Foundation. A special thanks goes to the National Park Service, particularly superintendent Brad Traver, for permission to core in the park and for logistical support during site selection and drilling. On-site and laboratory core processing, scanning, and archiving were carried out by LacCore, and we specifically thank Anders Noren, Kristina Brady, and Ryan O'Grady as well as the on-site core handling volunteers Justin Clifton, Bob Graves, Ed Lamb, Max Schnurrenberger, and Riley Black for their exceptional around-the-clock efforts, and drilling manager Doug Schnurrenberger for overseeing an excellent-run coring project. Curatorial facilities for the work halves of the CPCP cores are provided by the Rutgers Core Repository. Cornelia Rasmussen thanks her Ph.D. committee members: Thure Cerling, Gabriel Bowen, and Peter Lippert for their helpful comments on an early version of this manuscript. We thank editor Dr. Shucheng Xie and the reviewer Dr. Yadong Sun as well as one anonymous reviewer for their helpful comments that improved the manuscript. This is Petrified Forest Paleontological Contribution No. 85. The views expressed herein are those of the authors and do not represent those of the United States government.
Publisher Copyright:
© 2022 Elsevier B.V.
Keywords
- Late Triassic
- Manicouagan impact event
- Norian
- Paleoclimate
- Stable isotope record
Continental Scientific Drilling Facility tags
- CPCP