Selby, D. and Creaser, R. A. (2005) 'Direct radiometric dating of the Devonian-Mississippian time-scale boundary using the Re-Os black shale geochronometer.', Geology., 33 (7). pp. 545-548.
Many Phanerozoic time-scale boundaries are characterized by oceanic anoxia and mass extinction events with the deposition of black shale. The Re-Os isotope system in black shale can be used to provide depositional ages for these rocks, thus yielding direct radiometric ages for time-scale boundaries. We demonstrate that the Re-Os black shale geochronometer can yield precise ages useful for time-scale research through study of the Devonian-Mississippian boundary within the Exshaw Formation, Canada. The Re-Os date determined places the Devonian-Mississippian boundary at 361.3 ± 2.4 Ma (2σ including λ uncertainty, model 1, mean square of weighted deviates = 1.2), in accord with recent calibration interpolated from U-Pb zircon dates (360.7 ± 0.7 Ma) for the Hasselbachtal section, Germany.
|Additional Information:||Geological Society of America, P.O. Box 9140, Boulder, CO 80301-9140 USA (http://www.geosociety.org)|
|Keywords:||Re-Os, Black shale, Geochronology, Devonian-Mississippian boundary.|
|Full text:||Full text not available from this repository.|
|Publisher Web site:||http://dx.doi.org/10.1130/G21324.1|
|Record Created:||13 Mar 2007|
|Last Modified:||08 Feb 2011 16:31|
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