Articles | Volume 2, issue 2
Research article
23 Sep 2020
Research article |  | 23 Sep 2020

LA-ICPMS U–Pb geochronology of detrital zircon grains from the Coconino, Moenkopi, and Chinle formations in the Petrified Forest National Park (Arizona)

George Gehrels, Dominique Giesler, Paul Olsen, Dennis Kent, Adam Marsh, William Parker, Cornelia Rasmussen, Roland Mundil, Randall Irmis, John Geissman, and Christopher Lepre

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Cited articles

Ash, S. R.: The Black Forest Bed, a distinctive unit in the Upper Triassic Chinle Formation, north-eastern Arizona, J. Arizona-Nevada Acad. Sci., 24–25, 59–73, 1992. 
Atchley, S. C., Nordt, L. C., Dworkin, S. I., Ramezani, J., Parker, W. G., Ash, S. R., and Bowring, S. A.: A linkage among Pangean tectonism, cyclic alluviation, climate change, and biologic turnover in the Late Triassic: The Record from the Chinle Formation, Southwestern United States, J. Sediment. Res., 83, 1147–1161, 2013. 
Baranyi, V., Reichgelt, T., Olsen, P. E., Parker, W. G., and Kürschner, W. M.: Norian vegetation history and related environmental changes: new data from the Chinle Formation, Petrified Forest National Park (Arizona, SW USA), Geol. Soc. Am. B., 130, 775–795,, 2017. 
Barth, A. P. and Wooden, J. L.: Timing of magmatism following initial convergence at a passive margin, southwestern US Cordillera, and ages of lower crustal magma sources, J. Geol., 114, 231–245, 2006. 
Barth, A. P. Walker, J. D., Wooden, J. L., Riggs, N. R., and Schweickert, R. A.: Birth of the Sierra Nevada magmatic arc: Early Mesozoic plutonism and volcanism in the east-central Sierra Nevada of California, Geosphere, 7, 877–897, 2011. 
Short summary
U–Pb ages of zircon crystals are used to determine the provenance and depositional age of strata of the Triassic Chinle and Moenkopi formations and the Permian Coconino Sandstone of northern Arizona. Primary source regions include the Ouachita orogen, local Precambrian basement rocks, and Permian–Triassic magmatic arcs to the south and west. Ages from fine-grained strata provide reliable depositional ages, whereas ages from sandstones are compromised by zircon grains recycled from older strata.