Calibrating the data logger…
ABSTRACT: The Rb-Sr whole-rock method has been used to measure the ages of two alkalic intrusions and related carbonatites in Colorado: the Iron Hill complex in Gunnison County, and the McClure Mountain complex in Fremont County. The age and initial Sr87/Sr86 ratio of the Iron Hill complex are 1487 +/- 9 m. y. and 0.7027, respectively. Two isochrons define the limits of the age and initial Sr87/5r86 ratio for the McClure Mountain complex as 517 - 704 m. y. and 0.7055 - 0. 7059.
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