000098479 001__ 98479 000098479 005__ 20210902121850.0 000098479 0247_ $$2doi$$a10.1029/2020GC009149 000098479 0248_ $$2sideral$$a120637 000098479 037__ $$aART-2020-120637 000098479 041__ $$aeng 000098479 100__ $$aFendley, I.M. 000098479 245__ $$aNo Cretaceous-Paleogene Boundary in Exposed Rajahmundry Traps: A Refined Chronology of the Longest Deccan Lava Flows From 40Ar/39Ar Dates, Magnetostratigraphy, and Biostratigraphy 000098479 260__ $$c2020 000098479 5060_ $$aAccess copy available to the general public$$fUnrestricted 000098479 5203_ $$aDeccan Traps flood basalt volcanism affected ecosystems spanning the end-Cretaceous mass extinction, with the most significant environmental effects hypothesized to be a consequence of the largest eruptions. The Rajahmundry Traps are the farthest exposures (~1, 000 km) of Deccan basalt from the putative eruptive centers in the Western Ghats and hence represent some of the largest volume Deccan eruptions. Although the three subaerial Rajahmundry lava flows have been geochemically correlated to the Wai Subgroup of the Deccan Traps, poor precision associated with previous radioisotopic age constraints has prevented detailed comparison with potential climate effects. In this study, we use new 40Ar/39Ar dates, paleomagnetic and volcanological analyses, and biostratigraphic constraints for the Rajahmundry lava flows to ascertain the timing and style of their emplacement. We find that the lower and middle flows (65.92 ± 0.25 and 65.67 ± 0.08 Ma, ±1s systematic uncertainty) were erupted within magnetochron C29r and were a part of the Ambenali Formation of the Deccan Traps. By contrast, the uppermost flow (65.27 ± 0.08 Ma) was erupted in C29n as part of the Mahabaleshwar Formation. Given these age constraints, the Rajahmundry flows were not involved in the end-Cretaceous extinction as previously hypothesized. To determine whether the emplacement of the Rajahmundry flows could have affected global climate, we estimated their eruptive CO2 release and corresponding climate change using scalings from the LOSCAR carbon cycle model. We find that the eruptive gas emissions of these flows were insufficient to directly cause multi-degree warming; hence, a causal relationship with significant climate warming requires additional Earth system feedbacks. 000098479 536__ $$9info:eu-repo/grantAgreement/ES/MINECO/BES-2016-077800$$9info:eu-repo/grantAgreement/ES/MINECO-FEDER/PGC2018-093890-B-I00 000098479 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/ 000098479 590__ $$a3.624$$b2020 000098479 591__ $$aGEOCHEMISTRY & GEOPHYSICS$$b27 / 87 = 0.31$$c2020$$dQ2$$eT1 000098479 592__ $$a1.927$$b2020 000098479 593__ $$aGeophysics$$c2020$$dQ1 000098479 593__ $$aGeochemistry and Petrology$$c2020$$dQ1 000098479 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion 000098479 700__ $$aSprain, C.J. 000098479 700__ $$aRenne, P.R. 000098479 700__ $$0(orcid)0000-0003-4632-533X$$aArenillas, Ignacio$$uUniversidad de Zaragoza 000098479 700__ $$0(orcid)0000-0003-0063-8752$$aArz, José A.$$uUniversidad de Zaragoza 000098479 700__ $$0(orcid)0000-0001-7302-5901$$aGilabert, Vicente$$uUniversidad de Zaragoza 000098479 700__ $$aSelf, S. 000098479 700__ $$aVanderkluysen, L. 000098479 700__ $$aPande, K. 000098479 700__ $$aSmit, J. 000098479 700__ $$aMittal, T. 000098479 7102_ $$12000$$2655$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Paleontología 000098479 773__ $$g21, 9 (2020), e2020GC009149 [20 pp.]$$pGeochem. Geophys. Geosyst.$$tGEOCHEMISTRY GEOPHYSICS GEOSYSTEMS$$x1525-2027 000098479 8564_ $$s6197479$$uhttps://zaguan.unizar.es/record/98479/files/texto_completo.pdf$$yVersión publicada 000098479 8564_ $$s3309362$$uhttps://zaguan.unizar.es/record/98479/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada 000098479 909CO $$ooai:zaguan.unizar.es:98479$$particulos$$pdriver 000098479 951__ $$a2021-09-02-10:29:28 000098479 980__ $$aARTICLE