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  • Other Sources  (6)
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  • 1
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    East Butte: A volcanic dome of the Eastern Snake River Plain, Idaho (1984)
    In:  CASI
    Details
    Publication Date: 2006-04-06
    Description: Preliminary mapping shows East Butte to be a single, large cumulo-dome composed dominantly of rhyolite which can be classified into three main groups based on color and structure. The rhyolite of East Butte is aphanitic with phenocrysts of sanidine and quartz which vary from 1 to 5 mm in length. Vesicular reddish black inclusions of basalt up to 10 cm in length, found in all varieties of the East Butte rhyolites are believed to have originated from fragmentation of the basalt walls of the conduit by rhyolitic magma as it was emplaced. Most of the inclusions contain plagioclase phenocrysts. These phenocrysts measure up to 1 to 2 cm in length and have a typical euhedral, tabular habit. A 250-m diameter depression which has the appearance of a crater is located at the top of East Butte. Evidence supporting the fact that the depression is a crater is displayed by three small (3 to 5 m in height) mounds of massive rhyolite which border the depression.
    Keywords: GEOPHYSICS
    Type: NASA, Washington Rept. of Planetary Geol. Program, 1983; p 121-124
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  • 2
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    The Geology of Mt. Hope, a Silicic Volcanic Center in West Central Arizona (1985)
    In:  CASI
    Details
    Publication Date: 2014-10-08
    Description: The purpose was to establish a detailed history of the sequence of geologic events which occurred at Mt. Hope and an area 6.8 miles in diameter surrounding it. The final result will be comprised of information collected during field mapping, with data from petrographic studies and wet chemical analyses. From this it should be possible to suggest relationships to other volcanic regions, particularly bimodal suites in the transition zone, and gain a clearer picture of the petrologic nature of this area. Field work conducted this past summer confirmed the bimodal nature of volcanism at Mt. Hope. The symmetrical, radial cone is comprised of several rhyolites with numerous intrusions of intermediate-composition dikes and two breccia pipes near the summit.
    Keywords: GEOPHYSICS
    Type: NASA, Washington Repts. of Planetary Geol. and Geophys. Program; p 272-274
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  • 3
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    The Geology of East Butte, a Rhyolitic Volcanic Dome on the Eastern Snake River Plain, Idaho (1985)
    In:  CASI
    Details
    Publication Date: 2014-10-08
    Description: East Butte is a prominent volcanic dome located on the eastern Snake River Plain. It is situated 51 km west of Idaho Fallls in the southeast corner of the Idaho National Engineering facility. East Butte rises 350 meters above the Quaternary basalt flows which encircle its 2.4 kilometer diameter base. Its maximum elevation is 2003 meters above sea level. East Butte is composed dominantly of rhyolite. Armstrong and others (1975) determined a K-Ar age of 0.6 +/- m.y. for a rhyolite sample from East Butte. Detailed geologic mapping revealed East Butte to be a single, large cumulo-dome composed dominantly of rhyolite. Major element geochemical analyses indicate that the rhyolite of East Butte is mildly peralkaline (molecular excess of Na2O and K2O over Al2O3 and compositionally homogeneous. Color variations in the East Butte rhyolite result from varying amounts of chemical and physical weathering and to the degree of devitrification that the glass in the groundmass of the rhyolite underwent.
    Keywords: GEOPHYSICS
    Type: NASA, Washington Repts. of Planetary Geol. and Geophys. Program; p 269-271
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  • 4
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    Volcanism of the Eastern Snake River Plain, Idaho: A comparative planetary geology-guidebook (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The Planetary Geology Field Conference on the central Snake River Plain was conceived and developed to accomplish several objectives. Primarily, field conferences are sponsored by the National Aeronautics and Space Administration to draw attention to aspects of terrestrial geology that appear to be important in interpreting the origin and evolution of extraterrestrial planetary surfaces. Another aspect is to present results of recent research in a region. A final objective of this conference is to bring together investigators of diverse backgrounds who share a common interest in the Snake River Plain. The Snake River Plain appears to be similar in surface morphology to many volcanic regions on the Moon, Mars, and possibly Mercury. Therefore, the Snake River Plain, in combination with the relatively good state of preservation, the lack of forests or other heavy vegetation, and the good network of jeep trails, is an area nearly ideal for analog studies.
    Keywords: GEOPHYSICS
    Type: NASA-CR-154621
    Format: application/pdf
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  • 5
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    A proposed origin of the Olympus Mons escarpment (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Olympus Mons (Nix Olympica) on Mars is delimited by a unique steep, nearly circular scarp. A pyroclastic model is proposed for the construct's origin. It is postulated that the Olympus Mons plateau is constructed predominantly of numerous ash-flow tuffs which were erupted from central sources over an extended period of time. Lava flows may be intercalated with the tuffs. A schematic radial profile incorporating the inferred compaction zones for an ash sheet is proposed. Following emplacement, eolian (and possibly fluvial) erosion and abrasion during dust storms would act on the ash sheets. Interior portions of the sheets would spall and slump following eolian erosion, generating steep, relatively smooth boundary scarps. The scarp would be circular due to symmetrical distribution of compaction zones. The model implies further that the Olympus Mons plateau rests on a more resistant rock substrate.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 23; Oct. 197
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  • 6
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    Geologic field guide to the quaternary volcanics of the south-central Snake River Plain, Idaho (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: GEOPHYSICS
    Type: Annual Meeting; May 01, 1975; Boise, Idaho
    Format: text
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