Chemical Variation Related to the Stratigraphy of the Columbia River Basalt

Wright, Thomas L.; Grolier, Maurice J.; Swanson, Donald A.

doi:10.1130/0016-7606(1973)84<371:cvrtts>2.0.co;2

Cited by 73 publications

(45 citation statements)

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“…Almost all flows within the lower Yakima basalt fall within the highMg (average MgO, 4.9 percent), low-Mg (average MgO, 3.4 percent), or high-Ti (average Ti02, 2.35 percent) Yakima chemical types as designated by Wright, Grolier, and Swanson (1973). All these types are quite similar chemically and petrographically and are intermixed throughout this lower Yakima basalt part of the section.…”

Section: Chemistrymentioning

confidence: 81%

“…Swanson and Wright suggest that flows of this composition may be a new and different variety. Because of the relative position of the flows at St. Maries, these flows of the low-iron Picture Gorge chemical type are probably at or above the base of the middle Yakima basalt of Wright, Grolier, and Swanson (1973).…”

Section: Chemistrymentioning

confidence: 99%

“…All these types are quite similar chemically and petrographically and are intermixed throughout this lower Yakima basalt part of the section. The middle Yakima basalt includes flows that fall within the Lolo, Roza, Frenchman Springs, or Umatilla chemical types of Wright, Grolier, and Swanson (1973). The names applied to these chemically distinct types were derived and sometimes modified from named individual flows or flow units that have been mapped over a part of the plateau.…”

Section: Chemistrymentioning

confidence: 99%

“…The capping flows in the general Spokane area are of compositions consistent with an assignment to the middle Yakima basalt. Wright, Grolier, and Swanson (1973), except for high TiO2, and the Elephant Mountain chemical type, except for low Fe. Wright, Grolier, and Swanson (1973, p. 384) noted that some flows of otherwise equivalent composition have a higher Ti02 content in the eastern part of the plateau than in the rest of the plateau.…”

Section: Chemistrymentioning

confidence: 99%

“…Waters noted that some of the upper flows within the Yakima Basalt in the western part of the plateau constituted a more mafic variant which he designated the "late Yakima petrographic type." Comparing hundreds of analyses of basalts from all over the plateau, many of them from detailed sections, supplemented by field examinations, Wright, Grolier, and Swanson (1973, Wright, Grolier, and Swanson (1973).…”

Section: Chemistrymentioning

confidence: 99%

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The Columbia River Basalt Group in the Spokane Quadrangle, Washington, Idaho, and Montana, with a section on petrography

Griggs¹,

Swanson²

1976

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Section: Chemistrymentioning

confidence: 81%

Section: Chemistrymentioning

confidence: 99%

Section: Chemistrymentioning

confidence: 99%

Section: Chemistrymentioning

confidence: 99%

Section: Chemistrymentioning

confidence: 99%

See 3 more Smart Citations

The Columbia River Basalt Group in the Spokane Quadrangle, Washington, Idaho, and Montana, with a section on petrography

Griggs¹,

Swanson²

1976

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The Story of a Yakima Fold and How It Informs Late Neogene and Quaternary Backarc Deformation in the Cascadia Subduction Zone, Manastash Anticline, Washington, USA

et al. 2017

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The Yakima folds of central Washington, USA, are prominent anticlines that are the primary tectonic features of the backarc of the northern Cascadia subduction zone. What accounts for their topographic expression and how much strain do they accommodate and over what time period? We investigate Manastash anticline, a north vergent fault propagation fold typical of structures in the fold province. From retrodeformation of line‐ and area‐balanced cross sections, the crust has horizontally shortened by 11% (0.8–0.9 km). The fold, and by inference all other folds in the fold province, formed no earlier than 15.6 Ma as they developed on a landscape that was reset to negligible relief following voluminous outpouring of Grande Ronde Basalt. Deformation is accommodated on two fault sets including west‐northwest striking frontal thrust faults and shorter north to northeast striking faults. The frontal thrust fault system is active with late Quaternary scarps at the base of the range front. The fault‐cored Manastash anticline terminates to the east at the Naneum anticline and fault; activity on the north trending Naneum structures predates emplacement of the Grande Ronde Basalt. The west trending Yakima folds and west striking thrust faults, the shorter north to northeast striking faults, and the Naneum fault together constitute the tectonic structures that accommodate deformation in the low strain rate environment in the backarc of the Cascadia Subduction Zone.

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Early Western Margin of the United States

Maxwell¹

1974

The Geology of Continental Margins

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Chemical Variation Related to the Stratigraphy of the Columbia River Basalt

Cited by 73 publications

References 0 publications

The Columbia River Basalt Group in the Spokane Quadrangle, Washington, Idaho, and Montana, with a section on petrography

The Columbia River Basalt Group in the Spokane Quadrangle, Washington, Idaho, and Montana, with a section on petrography

The Story of a Yakima Fold and How It Informs Late Neogene and Quaternary Backarc Deformation in the Cascadia Subduction Zone, Manastash Anticline, Washington, USA

Early Western Margin of the United States

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