Paul A. Mueller
Lawrence C. Rowan
1971
<div class="article-section-wrapper js-article-section js-content-section "><p>Two cross-cutting mafic dikes in the headwall of Gardner Lake in the eastern Beartooth Mountains, Wyoming, have structural relations with Archean migmatite and gneiss that suggest intrusion between deformational phases recognized in the eastern part of the range. Fabric data show that the older dike, an orthoamphibolite, was emplaced subsequent to the F<sub>1</sub><span> </span>deformational event, but prior to the main episode of metamorphism, metasomatism, and folding, F<sub>2</sub>. The younger dike, a metanorite, was intruded after F<sub>2</sub>, but is folded by west-trending, open F<sub>3</sub><span> </span>folds. The style and general trend of these F<sub>3</sub><span> </span>folds are consistent with those observed elsewhere in the eastern part of the range. The data available and absolute age relations in other parts of the range indicate that F<sub>2</sub><span> </span>occurred 2750 m.y. ago and F<sub>3</sub><span> </span>1600 to 1800 m.y. ago.</p></div>
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10.1130/0016-7606(1971)82[2177:ROFDAP]2.0.CO;2
en
Geological Society of America
Relations of folded dikes and Precambrian polyphase deformation, Gardner Lake area, Beartooth Mountains, Wyoming
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