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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