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The AAPG/Datapages Combined Publications Database

Utah Geological Association

Abstract


Overthrust Belt of Utah, 1982
Pages 121-136

A Regional Gravity Survey of the Sanpete-Sevier Valleys and Adjacent Areas in Utah

Robert P. Brown, Kenneth L. Cook

Abstract

A regional gravity survey was made during the summer of 1968 in the Sanpete and Sevier Valleys and adjacent areas, Utah. The surveyed area covers approximately 2850 square miles. Gravity measurements were made by the senior author at 567 stations and these stations, combined with 157 stations from other sources, were compiled into a complete Bouguer gravity anomaly map with a contour interval of 2 milligals. The complete Bouguer values correlate well with the known large geologic structures of the region. The structures of the surveyed area are shown to be transitional between the Basin and Range and the Colorado Plateau provinces. The strong east-west asymmetry of the gravity map is thought to be due in part to the deepening of the Moho east of the Wasatch Line. The structure and lithology of the Arapien Formation are the major controlling factors in the gravity pattern. The thickness of the Arapien Formation is interpreted to be 8000 feet in the central part of the Sevier Valley and 7000 feet in the central part of the Sanpete Valley. An anticline of potential economic significance has been identified in the pre-Arapien formations. This anticline is located under the eastern margin of the Sevier Valley and is interpreted to have 5000 feet of structural relief and to be 4.9 miles wide at its base.


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