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Upper-crustal structure beneath the Columbia River Basalt Group, Washington: gravity interpretation controlled by borehole and seismic studies

Geological Society of America Bulletin

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Abstract

A three-dimensional gravity model indicates that the Miocene Columbia River Basalt Group (CRBG) overlies a broad basin filled with sedimentary rocks that reach thicknesses in excess of 5 km; thickest sub-basalt sedimentary rocks are beneath the late Cenozoic Yakima basin. Analysis of residual gravity shows that the Eocene Chiwaukum graben goes not continue beneath the CRBG and that sub-basalt sedimentary rocks are not thrust into the cores of the basalt anticlines in the Yakima fold belt. A major crustal feature, the Olympic-Wallowa lineament, is expressed in the gravity field. -from Author

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Upper-crustal structure beneath the Columbia River Basalt Group, Washington: gravity interpretation controlled by borehole and seismic studies
Series title:
Geological Society of America Bulletin
Volume
105
Issue:
9
Year Published:
1993
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geological Society of America Bulletin
First page:
1247
Last page:
1259
Number of Pages:
13