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The AAPG/Datapages Combined Publications Database

Wyoming Geological Association

Abstract


Geology Of the Bighorn Basin; 34th Annual Field Conference Guidebook, 1983
Pages 89-94

Gravity Anomalies Along the Beartooth Front, Montana: Evidence for a Low-Angle Thrust

William E. Bonini, Randy E. Kinard

Abstract

Recent documentation using well and seismic data has reopened the controversy on tectonic styles of deformation of Laramide structures in the Central Rocky Mountains. Styles suggested for the Beartooth Range and front have been that of a block uplift or a thrust, or fold-thrust, uplift. Analyses of a gravity profile across the Red Lodge corner of the Range support a model in which the Range has been thrust 12 kilometers (7frac12.gif (855 bytes) miles) over the Bighorn Basin. This suggests that the tectonic style of the Beartooth Range is more consistent with that of a thrust, or fold-thrust, uplift.

Several gravity low closures and northeast gravity high trends within the regional gravity low of the Bighorn Basin north of Cody, Wyoming, could be caused by one or a combination of: structure, sediment thickness, or intrabasement density variations. Further study of these anomalies is planned.


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