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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

Published online by Cambridge University Press:  25 October 2016

V. I. DAVYDOV ,
J. L. CROWLEY ,
M. D. SCHMITZ  and
W. S. SNYDER
V. I. DAVYDOV*
Affiliation:
Department of Geosciences, Boise State University, 1910 University Drive, Boise, ID 83725, USA Kazan Federal University, 18 Kremlyovskaya St., Kazan, Republic of Tatarstan 420008, Russia Department of Earth & Environment, Florida International University, 11200 S.W. 8th Street, Miami, FL 33199, USA
J. L. CROWLEY
Affiliation:
Department of Geosciences, Boise State University, 1910 University Drive, Boise, ID 83725, USA
M. D. SCHMITZ
Affiliation:
Department of Geosciences, Boise State University, 1910 University Drive, Boise, ID 83725, USA
W. S. SNYDER
Affiliation:
Department of Geosciences, Boise State University, 1910 University Drive, Boise, ID 83725, USA
*
†Author for correspondence: [email protected], [email protected]
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Abstract

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.

Keywords

U–Pb CA-IDTIMSPermian–TriassiccorrelationPhosphoria and Park City formationsIdaho North America marginSonoma orogeny
Type
Original Articles
Information
Geological Magazine , Volume 155 , Issue 1 , January 2018 , pp. 119 - 131
Copyright
Copyright © Cambridge University Press 2016 

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