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Journal Article

Volcanic history and magmatic evolution of Seguam Island, Aleutian Island arc, Alaska

Brian R. Jicha, Brad S. Singer
Journal: GSA Bulletin
Published: 01 July 2006
GSA Bulletin (2006) 118 (7-8): 805–822.
DOI: https://doi.org/10.1130/B25861.1
...Brian R. Jicha; Brad S. Singer Abstract New 40 Ar/ 39 Ar dating coupled with detailed field mapping, stratigraphy, and chemical analyses have established an eruptive chronology that reveals and constrains the compositional and volumetric evolution of Seguam Island in the Aleutian Island arc, Alaska...
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Journal Article

Plagioclase zonation in a basalt to rhyodacite eruptive suite, Seguam Island, Alaska; observations by Nomarski constrast interference

B. S. Singer, T. H. Pearce
Published: 01 June 1993
The Canadian Mineralogist (1993) 31 (2): 459–466.
DOI: https://doi.org/10.3749/1499-1276-31.2.459
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Journal Article

Plagioclase zoning in mid-Pleistocene lavas from the Seguam volcanic center, central Aleutian arc, Alaska

Bradley S. Singer, Thomas H. Pearce, Angela M. Kolisnik, James D. Myers
Published: 01 February 1993
American Mineralogist (1993) 78 (1-2): 143–157.
...Bradley S. Singer; Thomas H. Pearce; Angela M. Kolisnik; James D. Myers Abstract Nomarski and laser interferometry have been used to characterize plagioclase zoning in lavas ranging in composition from basalt to rhyodacite erupted at the Seguam volcanic center. This is the first application...
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Journal Article

Intra-arc extension and magmatic evolution in the central Aleutian arc, Alaska

Bradley S. Singer, James D. Myers
Journal: Geology
Published: 01 November 1990
Geology (1990) 18 (11): 1050–1053.
DOI: https://doi.org/10.1130/0091-7613(1990)018<1050:IAEAME>2.3.CO;2
...Bradley S. Singer; James D. Myers Abstract New geologic, petrologic, and Sr isotope data from Seguam Island, Alaska, reveal substantial variation in the composition of magmas of the central Aleutian arc. The data indicate that variable magmatic processes occur along the strike of the arc. Seguam...
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Journal Article

Vapor-bubble growth in olivine-hosted melt inclusions

Daniel J. Rasmussen, Terry A. Plank, Paul J. Wallace, Megan E. Newcombe, Jacob B. Lowenstern
Published: 01 December 2020
American Mineralogist (2020) 105 (12): 1898–1919.
DOI: https://doi.org/10.2138/am-2020-7377
... experiments were conducted on olivine-hosted melt inclusions from Seguam (Alaska, U.S.A.) and Fuego (Guatemala) volcanoes at the following conditions: 500–800 MPa, 1140–1200 °C for Seguam and 1110–1140 °C for Fuego, 4–8 wt% H 2 O in the KBr brine filling the experimental capsules, and run durations of 10–120...
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CO 2 -S trends in heated and unheated melt inclusions for ( a ) <span class="search-highlight">Seguam</span> and ...

CO 2 -S trends in heated and unheated melt inclusions for ( a ) Seguam and ...

Published: 01 December 2020
Figure 11. CO 2 -S trends in heated and unheated melt inclusions for ( a ) Seguam and ( d ) Fuego, and normalized histograms of CO 2 for ( b and c ) Seguam and ( e and f ) Fuego. Plotted are data for heated melt inclusions ( Heated ) and unheated bubble-bearing melt inclusions from
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TABLE 4. VOLUME ESTIMATES FOR <span class="search-highlight">SEGUAM</span> LAVAS AND TEPHRAS

TABLE 4. VOLUME ESTIMATES FOR SEGUAM LAVAS AND TEPHRAS

Published: 01 July 2006
TABLE 4. VOLUME ESTIMATES FOR SEGUAM LAVAS AND TEPHRAS
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TABLE 2. REPRESENTATIVE WHOLE-ROCK MAJOR- AND TRACE-ELEMENT COMPOSITIONS OF...

TABLE 2. REPRESENTATIVE WHOLE-ROCK MAJOR- AND TRACE-ELEMENT COMPOSITIONS OF...

Published: 01 July 2006
TABLE 2. REPRESENTATIVE WHOLE-ROCK MAJOR- AND TRACE-ELEMENT COMPOSITIONS OF SEGUAM ISLAND LAVAS
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TABLE 3. COMPARISON OF K-Ar AND 40 Ar&#x2F; 39 Ar AGES OF <span class="search-highlight">SEGUAM</span> ISLAND LAVAS

TABLE 3. COMPARISON OF K-Ar AND 40 Ar/ 39 Ar AGES OF SEGUAM ISLAND LAVAS

Published: 01 July 2006
TABLE 3. COMPARISON OF K-Ar AND 40 Ar/ 39 Ar AGES OF SEGUAM ISLAND LAVAS
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(A) Profile 1232E994 crosses the forearc offshore of <span class="search-highlight">Seguam</span> Island. HRSZ—Ha...

(A) Profile 1232E994 crosses the forearc offshore of Seguam Island. HRSZ—Ha...

Published: 01 December 2012
Figure 9. (A) Profile 1232E994 crosses the forearc offshore of Seguam Island. HRSZ—Hawley Ridge shear zone. (B) Close-up of area shown in box in A. Normal offset faults deform elevated area of Aleutian Terrace. No mass transport deposits are imaged within the forearc basin. Dark blue—base
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Figure 2. Digital elevation models (DEMs) of <span class="search-highlight">Seguam</span> Island with shaded area...

Figure 2. Digital elevation models (DEMs) of Seguam Island with shaded area...

Published: 01 July 2006
Figure 2. Digital elevation models (DEMs) of Seguam Island with shaded areas indicating the three main stages of eruptive activity over the past 318 k.y. Dots represent sample locations and are shown with corresponding 40 Ar/ 39 Ar ages reported in ka. The ages of 6.0 and 1.7 ka shown
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Figure 4. Geologic map of <span class="search-highlight">Seguam</span> Island. Topographic base map is compiled f...

Figure 4. Geologic map of Seguam Island. Topographic base map is compiled f...

Published: 01 July 2006
Figure 4. Geologic map of Seguam Island. Topographic base map is compiled from National Oceanic and Atmospheric Administration (NOAA) (1972) maps T-10322, T-10323, T-10324, and T-10325. The oldest of the 34 units are shown in shades of brown, orange, and gray. Lava flows flanking the Wilcox volcano
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Figure 9. Evolution of ( 230 Th&#x2F; 232 Th) 0 ratios measured in <span class="search-highlight">Seguam</span> Isla...

Figure 9. Evolution of ( 230 Th/ 232 Th) 0 ratios measured in Seguam Isla...

Published: 01 July 2006
Figure 9. Evolution of ( 230 Th/ 232 Th) 0 ratios measured in Seguam Island lavas as a function of eruptive age (expressed as e λ t ) (after Jicha et al., 2005 ). These ratios were obtained from the intercepts of mineral-glass whole-rock isochrons with the equiline. The lavas that erupted
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Figure 10. Cumulative eruptive volume versus time for the <span class="search-highlight">Seguam</span> Island vol...

Figure 10. Cumulative eruptive volume versus time for the Seguam Island vol...

Published: 01 July 2006
Figure 10. Cumulative eruptive volume versus time for the Seguam Island volcanic complex showing the total volume of each magma type erupted over the past 318 k.y. The total volume of erupted material is denoted by the black line. The oldest volcanism is primarily basaltic; however, >30
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Figure 11. SiO 2 versus age and compositional evolution of <span class="search-highlight">Seguam</span> lavas an...

Figure 11. SiO 2 versus age and compositional evolution of Seguam lavas an...

Published: 01 July 2006
Figure 11. SiO 2 versus age and compositional evolution of Seguam lavas and tuffs. Error bars represent 2σ uncertainties. Although there is no overall apparent correlation between age and SiO 2 silica content, several important patterns emerge. Older lavas between 318 and 142 ka include virtually
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Figure 12. Minimum cumulative volume versus time for <span class="search-highlight">Seguam</span> Island and othe...

Figure 12. Minimum cumulative volume versus time for Seguam Island and othe...

Published: 01 July 2006
Figure 12. Minimum cumulative volume versus time for Seguam Island and other well-dated Pleistocene to Holocene arc volcanoes. Data are restricted to the volume erupted at each volcano over the last 400 k.y. Data from Katmai volcanic cluster encompass seven frontal arc volcanoes and five rear-arc
Journal Article

Bubbles matter: An assessment of the contribution of vapor bubbles to melt inclusion volatile budgets

Lowell R. Moore, Esteban Gazel, Robin Tuohy, Alexander S. Lloyd, Rosario Esposito, Matthew Steele-MacInnis, Erik H. Hauri, Paul J. Wallace, Terry Plank, Robert J. Bodnar
Published: 01 April 2015
American Mineralogist (2015) 100 (4): 806–823.
DOI: https://doi.org/10.2138/am-2015-5036
... on quantitative Raman analysis of the vapor bubbles in MI from the 1959 Kilauea Iki (Hawaii), 1960 Kapoho (Hawaii), 1974 Fuego volcano (Guatemala), and 1977 Seguam Island (Alaska) eruptions. We found that the bubbles typically contain 40 to 90% of the total CO 2 in the MI. Reconstructing the original CO 2 content...
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Includes: Supplemental Content
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Photomicrographs of representative MI from this study. ( a ) a typical glas...

Photomicrographs of representative MI from this study. ( a ) a typical glas...

Published: 01 April 2015
) A typical glassy, bubble-bearing MI (Seguam 14.1) hosted by olivine from tephras erupted on Pyre Peak (1977), Seguam Island, Alaska. This MI shows the “wrinkled” texture that is common in the larger MI (~100 μm or larger) from these samples. ( e ) An olivine-hosted MI from Seguam Island, Alaska (SEG 7.1
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Post-entrapment processes during quench. Shown are closure (S, MgO, and CO ...

Post-entrapment processes during quench. Shown are closure (S, MgO, and CO ...

Published: 01 December 2020
. Entrapment temperatures of Seguam and Fuego melt inclusions are shown with the gray shaded region (1070 ± 40 °C), which encompasses 90% of the data. The time to cool from 1100 °C to the glass transition temperature (i.e., cooling time) is indicated. Closure temperatures were calculated using the Dodson
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Figure 5. Representative 40 Ar/ 39 Ar age spectrum and inverse isochron di...

Figure 5. Representative 40 Ar/ 39 Ar age spectrum and inverse isochron di...

Published: 01 July 2006
Figure 5. Representative 40 Ar/ 39 Ar age spectrum and inverse isochron diagrams for five Seguam lavas and one ignimbrite. The preferred ages and ±2σ errors in bold are given by the plateau steps in the age spectra.