U‐Pb and40Ar/39Ar Ages for a Tephra Lens in the Middle Jurassic Page Sandstone: First Direct Isotopic Dating of a Mesozoic Eolianite on the Colorado Plateau
Joint U‐Pb and40Ar/39Ar geochronology for pyroclastic zircon and biotite crystals from tephra lenses intercalated within eolianite of the Middle Jurassic Page Sandstone on the Colorado Plateau provides the first direct isotopic age for a Jurassic eolianite on the Colorado Plateau and indicates a chr...
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| Veröffentlicht in: | The Journal of geology 2010-03, Vol.118 (2), p.215-221 |
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| container_title | The Journal of geology |
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| creator | Dickinson, William R. Stair, Kelley N. Gehrels, George E. Peters, Lisa Kowallis, Bart J. Blakey, Ronald C. Amar, Joseph R. Greenhalgh, Brent W. |
| description | Joint U‐Pb and40Ar/39Ar geochronology for pyroclastic zircon and biotite crystals from tephra lenses intercalated within eolianite of the Middle Jurassic Page Sandstone on the Colorado Plateau provides the first direct isotopic age for a Jurassic eolianite on the Colorado Plateau and indicates a chronostratigraphic age of 171.5–169.5 Ma for the Page Sandstone. With stated uncertainties in the age boundaries of global stratigraphic stages taken into account, the isotopic age of lower Bajocian is coordinate with the inferred biostratigaphic age of upper Bajocian from lateral correlation of Page Sandstone with equivalent marine strata. Comparative isotopic ages imply that the Page Sandstone was deposited during the same time frame as the Temple Cap Formation, inferred conventionally to be older, and that the J1 and J2 surfaces of the Colorado Plateau are therefore not reliable chronostratigraphic marker horizons. |
| doi_str_mv | 10.1086/649819 |
| format | Article |
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With stated uncertainties in the age boundaries of global stratigraphic stages taken into account, the isotopic age of lower Bajocian is coordinate with the inferred biostratigaphic age of upper Bajocian from lateral correlation of Page Sandstone with equivalent marine strata. Comparative isotopic ages imply that the Page Sandstone was deposited during the same time frame as the Temple Cap Formation, inferred conventionally to be older, and that the J1 and J2 surfaces of the Colorado Plateau are therefore not reliable chronostratigraphic marker horizons.</description><identifier>ISSN: 0022-1376</identifier><identifier>EISSN: 1537-5269</identifier><identifier>DOI: 10.1086/649819</identifier><language>eng</language><publisher>The University of Chicago Press</publisher><subject>Bentonite ; Biotite ; Canyons ; Decay constants ; Dunes ; Geochronology ; Geological facies ; Geological Note ; Sandstones ; Tephra ; Weighted averages</subject><ispartof>The Journal of geology, 2010-03, Vol.118 (2), p.215-221</ispartof><rights>2010 by The University of Chicago. 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With stated uncertainties in the age boundaries of global stratigraphic stages taken into account, the isotopic age of lower Bajocian is coordinate with the inferred biostratigaphic age of upper Bajocian from lateral correlation of Page Sandstone with equivalent marine strata. 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With stated uncertainties in the age boundaries of global stratigraphic stages taken into account, the isotopic age of lower Bajocian is coordinate with the inferred biostratigaphic age of upper Bajocian from lateral correlation of Page Sandstone with equivalent marine strata. Comparative isotopic ages imply that the Page Sandstone was deposited during the same time frame as the Temple Cap Formation, inferred conventionally to be older, and that the J1 and J2 surfaces of the Colorado Plateau are therefore not reliable chronostratigraphic marker horizons.</abstract><pub>The University of Chicago Press</pub><doi>10.1086/649819</doi></addata></record> |
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| language | eng |
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| source | Jstor Complete Legacy |
| subjects | Bentonite Biotite Canyons Decay constants Dunes Geochronology Geological facies Geological Note Sandstones Tephra Weighted averages |
| title | U‐Pb and40Ar/39Ar Ages for a Tephra Lens in the Middle Jurassic Page Sandstone: First Direct Isotopic Dating of a Mesozoic Eolianite on the Colorado Plateau |
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