publication . Other literature type . 1981

Mineralogy and Petrology of Lava Flows (Tertiary-Quaternary) In Southeastern Idaho and at Black Mountain, Rich County, Utah

Puchy, Barbara J.;
Open Access
  • Published: 01 May 1981
  • Publisher: DigitalCommons@USU
  • Country: United States
Abstract
Lava flows of Tertiary-Quaternary age occur in Enoch Valley, Upper Valley, and Slug Valley in southeastern Idaho. The basalts in Upper Valley and Enoch Valley contain olivine (Fo69 to Fo37), plagioclase (An62 to An39), augite and Fe-Ti oxides. The lava in Slug Valley lacks plagioclase, but contains sanidine (Or70 to Or56) with a trace of biotite and amphibole, and thus, has been termed alkali trachyte. Black Mountain, on the eastern side of Bear Lake, northeastern Utah, is capped by basalt. Minerals present include olivine (Fo83 to Fo72), plagioclase (An71 to An53 J, augite, and magnetite. Chemically, the basalt of Enoch Valley is comparable to olivine tholeiite...
Subjects
free text keywords: mineralogy, petrology, lava flows, Black Mountain, Utah, Geology, Geology
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DigitalCommons@USU
Other literature type . 1981
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