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New U–Pb constraints identify the end-Guadalupian and possibly end-Lopingian extinction events conceivably preserved in the passive margin of North America: implication for regional tectonics

  • V. I. DAVYDOV (a1) (a2) (a3), J. L. CROWLEY (a1), M. D. SCHMITZ (a1) and W. S. SNYDER (a1)

The discovery and dating of a volcanic ash bed within the upper Phosphoria Formation in SE Idaho, USA, is reported. The ash occurs 11 m below the top of the phosphatic Meade Peak Member and yielded a 206Pb/238U date of 260.57 ± 0.07 / 0.14 / 0.31 Ma, i.e. latest Capitanian, Guadalupian. The stratigraphic position of this ash near the top of the Meade Peak phosphatic Member of Phosphoria Formation indicates plausible completeness of the sedimentation within the Guadalupian–Lopingian and probably at the Permo-Triassic (P-T) transitions. The new radiometric age reveals that the regional biostratigraphy and palaeontology of Phosphoria and Park City formations requires serious reconsideration, particularly in cool water conodonts, bryozoans and brachiopods. The new age proposes that the Guadalupian–Lopingian boundary (GLB) coincides with the Meade Peak – Rex contact and consequently with the end-Guadalupian extinction event. The lack of a major unconformity at the P-T transition suggests that the effects of the Sonoma orogeny were not as extensive as has been assumed.

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Algeo, T., Henderson, C. M., Ellwood, B. B., Rowe, H., Elswick, E., Bates, S., Lyons, T. W., Hower, J. C., Smith, C., Maynard, B., Hays, L. E., Summons, R. E., Fulton, J. & Freeman, K. H. 2012. Evidence for a diachronous Late Permian marine crisis from the Canadian Arctic region. Geological Society of America Bulletin 124, 1424–48.
Algeo, T. J. & Twitchett, R. J. 2010. Anomalous Early Triassic sediment fluxes due to elevated weathering rates and their biological consequences. Geology (Boulder) 38, 1023–6.
Alvarez, W. & O'Connor, D. 2002. Permian-Triassic boundary in the Southwestern United States: hiatus or continuity? In Catastrophic Events and Mass Extinctions: Impacts and Beyond (eds Koeberl, G. & MacLeod, K. G.), pp. 385–93. Geological Society of America Special Paper 356.
Baud, A., Richoz, S., Beauchamp, B., Cordey, F., Grasby, S., Henderson, C., Krystyn, L. & Nicora, A. 2012. The Buday'ah Formation, Sultanate of Oman: a Middle Permian to Early Triassic oceanic record of the Neotethys and the late Induan microsphere bloom. Journal of Asian Earth Sciences 43, 130–44.
Blakey, R. C. 2013. Using paleogeographic maps to portray Phanerozoic geologic and paleotectonic history of western North America. AAPG Bulletin 97, 146.
Collinson, J. W., Kendall, G. St. C. & Marcantel, J. B. 1976. Permian–Triassic boundary in eastern Nevada and west-central Utah. Geological Society of America Bulletin 87, 821–4.
Condon, D., Schoene, B., McLean, N. M., Bowring, S. & Parrish, R. 2015. Metrology and traceability of U–Pb isotope dilution geochronology (EARTHTIME Tracer Calibration Part I). Geochimica et Cosmochimica Acta 164, 464–80.
Crowley, J. L., Schoene, B. & Bowring, S. A. 2007. U-Pb dating of zircon in the Bishop Tuff at the millennial scale. Geology 35, 1123–6.
Davydov, V. I. 2014. Warm water benthic foraminifera document the Pennsylvanian–Permian warming and cooling events — the record from the Western Pangea tropical shelves. Palaeogeography, Palaeoclimatology and Palaeogeography 414, 284–95.
Davydov, V. I., Biakov, A. S., Isbell, J. L., Crowley, J. L., Schmitz, M. D. & Vedernikov, I. L. 2015. Middle Permian U–Pb zircon ages of the “glacial” deposits of the Atkan Formation, Ayan-Yuryakh anticlinorium, Magadan province, NE Russia: their significance for global climatic interpretations. Gondwana Research, doi: 10.1016/
Denison, R. E. & Peryt, T. M. 2009. Strontium isotopes in the Zechstein (Upper Permian) anhydrites of Poland: evidence of varied meteoric contributions to marine brines. Geological Quarterly 53, 159–66.
Dott, R. H. 1961. Permo-Triassic diastrophism in the western Cordilleran region. American Journal of Science 259, 561–82.
Gerstenberger, H. & Haase, G., 1997. A highly effective emitter substance for mass spectrometric Pb isotope ratio determinations. Chemical Geology 136, 309–12.
Hein, J. R., Perkins, R. B. & McIntyre, B. R. 2004. Evolution of thought concerning the origin of the Phosphoria Formation, Western US Phosphate Field. In Life Cycle of the Phosphoria Formation: From Deposition to the Post-Mining Environment (ed. Hein, J. R.), pp. 1942. Handbook of Exploration and Environmental Geochemistry no. 8.
Henderson, C. M., Davydov, V. I. & Wardlaw, B. R. 2012. The Permian Period . In The Geological Time Scale (eds. Gradstein, F., Ogg, J., Schmitz, M. D. & Ogg, G.), pp. 652–79. Amsterdam: Elsevier.
Henderson, C. M. & Mei, S. 2007. Geographical clines in Permian and lower Triassic gondolellids and its role in taxonomy. Palaeoworld 16, 190201.
Hofmann, R., Hautmann, M. & Bucher, H. 2013. A new paleoecological look at the Dinwoody Formation (Lower Triassic, Western USA): intrinsic versus extrinsic controls on ecosystem recovery after the end-Permian mass extinction. Journal of Paleontology 87, 854–80.
Jaffey, A. H., Flynn, K. F., Glendenin, L. E., Bentley, W. C. & Essling, A. M. 1971. Precision measurement of half-lives and specific activities of 235U and 238U. Physical Review C 4, 1889–906.
Kozur, H. 1975. Beiträge zur Conodontenfauna des Perm. Geologische-Paläontologische Mitteilungen Innsbruck 5, 144.
Ketner, K. B. 2008. The Inskip Formation, the Harmony Formation, and the Havallah Sequence of northwestern Nevada: an interrelated Paleozoic assemblage in the home of the Sonoma Orogeny. US Geological Survey Professional Paper 1757, 121.
Kozur, H., Brandner, R., Resch, W. & Mostler, H. 1995. Permian conodont zonation and its importance for the Permian stratigraphic standard scale. Geologisch-Paläontologische Mitteilungen Innsbruck 20, 165205.
Krogh, T. E. 1973. A low-contamination method for hydrothermal decomposition of zircon and extraction of U and Pb for isotopic age determinations. Geochimica et Cosmochimica Acta 37, 485–94.
Lee, M.-Y., Chen, C.-H., Wei, K.-Y., Iizuka, Y. & Carey, S. 2004. First Toba supereruption revival. Geology (Boulder) 32, 61–4.
Ludwig, K. R. 2003. User's Manual for Isoplot 3.00. Berkeley, CA: Berkeley Geochronology Center.
McLean, N. M., Condon, D., Schoene, B. & Bowring, S. 2015. Calibration of the EARTHTIME 235U-233U-205Pb-(202Pb) tracer for high-precision U/Pb geochronology: Part II, evaluating analytical and systematic uncertainties. Geochimica et Cosmochimica Acta 164, 481501.
Mattinson, J. M. 2005. Zircon U-Pb chemical abrasion (“CA-TIMS”) method: combined annealing and multi-step partial dissolution analysis for improved precision and accuracy of zircon ages. Chemical Geology 220, 4766.
Miller, M. M. 1989. Intra-arc sedimentation and tectonism: late Paleozoic evolution of the eastern Klamath Terrane, California. Geological Society of America Bulletin 101, 170–87.
Mytton, J. W., Morgan, W. A. & Wardlaw, B. R. 1983. Stratigraphic relations of Permian units, Cassia Mountains, Idaho. In Tectonic and Stratigraphic Studies in the Eastern Great Basin (eds Miller, D. M., Todd, V. R. & Howard, K. A.), pp. 281303. Geological Society of America Memoir 157.
Northrup, C. J. & Snyder, W. S. 2000. Significance of the Sonoma Orogeny, Western U.S.: what, where, and when? Geological Society of Nevada Symposium 2000, Program with Abstracts, 6667.
Ota, A., Isozaki, Y., Shi, G. R., Campi, M. J. & Shen, S. 2006. Fusuline biotic turnover across the Guadalupian-Lopingian (Middle-Upper Permian) boundary in mid-oceanic carbonate buildups: biostratigraphy of accreted limestone in Japan. Journal of Asian Earth Sciences 26, 353–68.
Paull, R. K. 1980. Conodont biostratigraphy of the Lower Triassic Dinwoody Formation in northwestern Utah, northeastern Nevada, and southeastern Idaho. Ph.D. thesis, University of Wisconsin, Madison. Published thesis.
Paull, R. K. & Paull, R. A. 1986. Epilogue for the Permian in the western Cordillera: a retrospective view from the Triassic. Contributions to Geology 24, 243–52.
Paull, R. K. & Paull, R. A. 1994 a. Lower Triassic transgressive-regressive sequences in the Rocky Mountains, eastern Great Basin, and Colorado Plateau, USA. Sedimentary Geology 93, 181–91.
Paull, R. K. & Paull, R. A., 1994 b. Hindeodus parvus: proposed index fossil for the Permian-Triassic boundary. Lethaia 27, 271–2.
Perkins, R. B., Piper, D. Z. & Hein, J. R. 2004. The Meade Peak Member of the Phosphoria Formation: temporal and spatial variations in sediment geochemistry. In Life Cycle of the Phosphoria Formation: From Deposition to the Post-Mining Environment (ed. Hein, J. R.), pp. 73110. Handbook of Exploration and Environmental Geochemistry no. 8.
Poole, F. G. & Wardlaw, B. R. 1978. Candelaria (Triassic) and Diablo (Permian) formations in southern Toquima Range, central Nevada. In Mesozoic Paleogeography of the western United States (eds Howell, D. G. & McDougall, K.). Los Angeles: Society of Economic Paleontologists and Mineralogists, Pacific Section, pp. 271–6. Pacific Coast Paleogeography Symposium 2.
Saltzman, M. R. & Sedlacek, A. R. C. 2013. Chemostratigraphy indicates a relatively complete Late Permian to Early Triassic sequence in the Western United States. Geology (Boulder) 41, 399402.
Schmitz, M. D. & Schoene, B. 2007. Derivation of isotope ratios, errors, and error correlations for U-Pb geochronology using (super 205) Pb- (super 235) U- ((super 233) U)-spiked isotope dilution thermal ionization mass spectrometric data. Geochemistry, Geophysics, Geosystems 8, 120.
Sepkoski, J. J. Jr. 2002. A compendium of fossil marine animal genera. Bulletins of American Paleontology 363, 1560.
Silberling, N. J. & Roberts, R. J. 1962. Pre-Tertiary stratigraphy and structure of northwestern Nevada. Geological Society of America Special Paper 58, 156.
Stevens, C. H. 1991. Permian paleogeography of the Western United States. In Paleozoic Paleogeography of the Western United States – II (eds Cooper, J. D. & Stevens, C. H.). Los Angeles: Society of Economic Paleontologists and Mineralogists, Pacific Section, pp. 149–66. Field Trip Guidebook 67.
Stewart, J. H., Poole, F. G. & Wilson, R. F., 1972. Stratigraphy and origin of the Chinle Formation and related Upper Triassic strata in the Colorado Plateau region: US Geological Survey Professional Paper 690, 1336.
Szurlies, M. 2013. Late Permian (Zechstein) magnetostratigraphy in Western and Central Europe. In Palaeozoic Climate Cycles: Their Evolutionary and Sedimentological Impact (eds Gasiewicz, A. & Slowakiewicz, M.), pp. 7385. Geological Society of London, Special Publication 376.
Tomlinson, A. J., Miller, E. L., Holdsworth, B. K., Whiteford, W. B., Snyder, W. S. & Brueckner, H. K. 1987. Structure of the Havallah Sequence, Golconda Allochthon, Nevada: evidence for prolonged evolution in an accretionary prism: discussion and reply. Geological Society of America Bulletin 98, 615–17.
Wardlaw, B. R. 1977. The biostratigraphy and paleoecology of the Gerster Limestone (Upper Permian) in Nevada and Utah. US Geological Survey Open File Report 77–470, 1124.
Wardlaw, B. R. 2001. Smooth Gondolellids from the Kungurian and Guadalupian of the Western U.S. Permophiles 42, 20–1.
Wardlaw, B. R. 2003. Global Guadalupian (Middle Permian) conodont correlation and distribution. Permophiles 38, 22–4.
Wardlaw, B. R. & Collinson, J. W. 1979. Youngest Permian conodont faunas from the Great Basin and Rocky Mountain regions. In Conodont Biostratigraphy of the Great Basin and Rocky Mountains (eds Sandberg, C. & Clark, D. L.), pp. 151–63. Brigham Young University, Geology Studies 26.
Wardlaw, B. R. & Collinson, J. W. 1986. Paleontology and deposition of the Phosphoria Formation. Contributions to Geology 24, 107–42.
Wardlaw, B. R., Collinson, J. W. & Maughan, E. K. 1979. The Murdock Mountain Formation: a new unit of the Permian Park City Group. US Geological Survey Professional Paper 1163, 58.
Wardlaw, B. R., Snyder, W. S., Spinosa, C. & Gallegos, D. M. 1995. Permian of the Western United States. In Permian of Northern Pangaea (eds Scholle, P. A., Peryt, T. M. & Ulmer-Scholle, D. S.), pp. 2340. Berlin: Springer-Verlag.
Whalen, M. T. 1996. Facies architecture of the Permian Park City Formation, Utah and Wyoming: implications for the paleogeography and oceanographic setting of western Pangea. In Paleozoic Systems of the Rocky Mountain Region (eds Longman, M. W. & Sonnenfeld, M. D.), pp. 355378. Denver, CO: Rocky Mountain Section, Society for Sedimentary Geology.
Wignall, P. B., Sun, Y., Bond, D. P. G., Izon, G., Newton, R. J., Vedrine, S., Widdowson, M., Ali, J. R., Lai, X., Jiang, H., Cope, H. & Bottrell, S. H. 2009. Volcanism, mass extinction, and carbon isotope fluctuations in the Middle Permian of China. Science 324, 1179–82.
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