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Four additional multi-crystal measurements are in general agreement with this age. Although the essence of those studies has been published previously, Richard Keizer, James Lyons and Eric Swanson are deserving of renewed recognition for their fine work. Farley, A precise ^(40)Ar–^(39)Ar reference age for the Durango apatite (U–Th)/He and fission-track dating standard, Chemical Geology, Volume 214, Issues 3–4, 25 January 2005, Pages 249-263, ISSN 0009-2541, 10.1016/j.chemgeo.20.Also in agreement are a set of 24 (U–Th–Sm)/He ages recently determined directly on the apatite, which have a mean of 31.02±1.01 Ma 1σ, with a standard error (S. Keizer and Paul Guenther also provided help with the K–Ar dating. *Prices in US$ apply to orders placed in the Americas only.Prices in GBP apply to orders placed in Great Britain only. Apatite and iron ore formed in situ and concurrently along with emplacement of small felsic intrusions along the southern margin of the Chupaderos caldera complex.
Mineral grains are handpicked and screened for inclusions using customized Nikon SMZ-U/100 stereomicroscopes with a rotating stages.Consequently, the U-Pb dates obtained on apatite can be interpreted as the emplacement ages for these mafic intrusions.Our results demonstrate that, in all cases, the apatite grains do carry enough radiogenic Pb to be dated by in situ U-Pb analyses and yield a Pb-corrected mean age of 363.4 ± 5.8 Ma. The apatite occurs within the Cerro de Mercado open-pit iron mine, located in the northern portion of Durango City, Mexico. AUTHORS:20121120-130529682 Full text is not posted in this repository. Use this Persistent URL to link to this item: AUTHORS:20121120-130529682The distinctive Durango apatite is widely distributed as a reference material for mineralogy, geochemistry and thermochronology.