Publication Title

Geological Society of America Bulletin

Publication Date

6-1976

Document Type

Article

Disciplines

Earth Sciences

Abstract

Rb-Sr isochron data from whole-rock samples of dolerite and metadolerite indicate emplacement of dikes 2,826 ± 58 m.y. ago, during formation of the Bighorn gneiss and granitic complexes. Whole-rock samples of other dolerite dikes and mineral separates mark another intrusive event at 2,200 ± 35 m.y. B.P., well after the regional metamorphism. Two episodes of mafic dike emplacement are consistent with field relations but are not in agreement with recent K-Ar age determinations.

Comments

An edited version of this paper was published by AGU. Copyright 1974 American Geophysical Union.


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