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Comment and Reply on "Late Triassic paleogeography of the southern Cordillera: The problem of a source for voluminous volcanic detritus in the Chinle Formation of the Colorado Plateau region"

Stewart, John H. and Anderson, Thomas H. and Haxel, Gordon B. and Silver, Leon T. and Wright, James E. (1987) Comment and Reply on "Late Triassic paleogeography of the southern Cordillera: The problem of a source for voluminous volcanic detritus in the Chinle Formation of the Colorado Plateau region". Geology, 15 (6). pp. 578-579. ISSN 0091-7613. https://resolver.caltech.edu/CaltechAUTHORS:20130508-152220795

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Abstract

On page 569 of our article (Stewart et al., 1986) we emphasized the critical dependence of our ideas upon the validity of the isotopic and paleontologic geochronology, and on the calibration between the two methods. Wyman also emphasizes this same point but introduces other information—namely, isotopic dates on uranium ores in the Chinle Formation. He indicates, citing the work of Miller and Kulp (1963), that the average date for uranium ores in the Chinle Formation in the Cameron area, Arizona, is 175 Ma and in Lisbon Valley, Utah, is 150 Ma. These averages, however, seem meaningless because they incorporate individual dates that range from 101 to 218 Ma at Cameron, and from 95 to 207 Ma at Lisbon Valley. In any case, recent data (not cited by Wyman) gives a concordant U-Pb age of 206 ±1 Ma for uranium ores from the Chinle Formation in Lisbon Valley (Ludwig et al., 1986).


Item Type:Article
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http://dx.doi.org/10.1130/0091-7613(1987)15<578a:CAROLT>2.0.CO;2DOIUNSPECIFIED
http://geology.geoscienceworld.org/content/15/6/578.1PublisherUNSPECIFIED
http://geology.gsapubs.org/content/15/6/578.1PublisherUNSPECIFIED
http://resolver.caltech.edu/CaltechAUTHORS:20130508-152950143Related ItemUNSPECIFIED
Additional Information:© 1987 Geological Society of America.
Issue or Number:6
Record Number:CaltechAUTHORS:20130508-152220795
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130508-152220795
Official Citation:Comment and Reply on “Late Triassic paleogeography of the southern Cordillera: The problem of a source for voluminous volcanic detritus in the Chinle Formation of the Colorado Plateau region”: COMMENT Geology, June, 1987, v. 15, p. 578, doi:10.1130/0091-7613(1987)15<578a:CAROLT>2.0.CO;2
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38366
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:13 May 2013 19:51
Last Modified:03 Oct 2019 04:56

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