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Chaos Crags

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Journal Article
Published: 01 October 2018
American Mineralogist (2018) 103 (10): 1575–1590.
...Melissa A. Scruggs; Keith D. Putirka Abstract Magma mixing at arc volcanoes is common, but the manner in which mixing or mafic recharge may trigger volcanic eruptions is unclear. We test ideas of eruption triggering for the 1103 ± 13 years B.P. Chaos Crags eruption at the Lassen Volcanic Center...
FIGURES | View All (13)
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(A) Google Earth™ image of <span class="search-highlight">Chaos</span> <span class="search-highlight">Crags</span> (Lassen volcanic center, California,...
Published: 20 July 2021
Figure 1. (A) Google Earth™ image of Chaos Crags (Lassen volcanic center, California, USA; 40.5240°N, 121.5222°W) showing sampling sites. Inset shows location of Chaos Crags (red triangle) in California. Horizontal distance between sampling sites CCC and CC4A/B is approximately 2250 m. SF—San
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Simplified geologic map of the <span class="search-highlight">Chaos</span> <span class="search-highlight">Crags</span> (after  Christiansen et al. 2002...
Published: 01 October 2018
Figure 1. Simplified geologic map of the Chaos Crags (after Christiansen et al. 2002 ) overlain on 1 MOA Shasta Co. DEM (USGS National Elevation Data set). (Color online.)
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SiO 2  (wt%) vs. measured mol% An (plagioclase) within natural <span class="search-highlight">Chaos</span> <span class="search-highlight">Crags</span> ...
Published: 01 October 2018
Figure 2. SiO 2 (wt%) vs. measured mol% An (plagioclase) within natural Chaos Crags samples from this study and experimental plagioclase from referenced studies. Experimental plagioclase are equilibrated over the range of 750–1125 °C, 0.01–2.5 kbar, and 1.2–5.3 wt% H 2 O; red rectangle
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Frequency distributions of olivine Fo contents within <span class="search-highlight">Chaos</span> <span class="search-highlight">Crags</span> mafic enc...
Published: 01 October 2018
Figure 7. Frequency distributions of olivine Fo contents within Chaos Crags mafic enclaves. Fo content = 100·[Mg/(Mg+Fe)].
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Classification of amphiboles present within <span class="search-highlight">Chaos</span> <span class="search-highlight">Crags</span> eruptive products. ...
Published: 01 October 2018
Figure 8. Classification of amphiboles present within Chaos Crags eruptive products. Amphibole compositions measured from host lavas are represented in light gray; amphibole compositions measured from mafic enclaves are represented in dark gray (after Leake et al. 1997 ).
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Frequency distributions of Pioclase An contents within <span class="search-highlight">Chaos</span> <span class="search-highlight">Crags</span> eruptive...
Published: 01 October 2018
Figure 9. Frequency distributions of Pioclase An contents within Chaos Crags eruptive products. Plagioclase compositions measured from host lavas are represented in white with black outlines; plagioclase compositions measured from mafic enclaves are represented in gray. An component = Ca/(Ca+Na).
Journal Article
Published: 01 June 1979
Bulletin of the Seismological Society of America (1979) 69 (3): 867–875.
... the north and east sides of the 4-km-diameter Mt. Tehama caldera. The recent dacite plug domes of Lassen Peak and Chaos Crags are nearly aseismic, however. Several approximate focal mechanism solutions indicate primarily normal faulting with east-west extension. This implies the northwest-trending seismic...
Journal Article
Journal: Geology
Published: 20 July 2021
Geology (2021) 49 (11): 1348–1352.
...Figure 1. (A) Google Earth™ image of Chaos Crags (Lassen volcanic center, California, USA; 40.5240°N, 121.5222°W) showing sampling sites. Inset shows location of Chaos Crags (red triangle) in California. Horizontal distance between sampling sites CCC and CC4A/B is approximately 2250 m. SF—San...
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Journal Article
Published: 01 February 2016
American Mineralogist (2016) 101 (2): 343–354.
... records of hydrothermal discharge are likely too short to document long-term transients, whether they are intrinsic to the system or owe to various geologic events such as the eruption of Lassen Peak at 27 ka, deglaciation beginning ~18 ka, the eruptions of Chaos Crags at 1.1 ka, or the minor 1914–1917...
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Histograms (n = 305) of ( a ) anorthite (An) content of plagioclase, ( b ) ...
Published: 01 October 2018
▸Figure 12. Histograms (n = 305) of ( a ) anorthite (An) content of plagioclase, ( b ) SiO 2 contents of liquids equilibrated with such plagioclase that are also consistent with Chaos Crags whole-rock compositions (see Fig. 3 ), and ( c ) temperature estimates for plagioclase + liquid
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A comparison of SiO 2  vs. ( a ) MgO and ( b ) K 2 O for natural whole-rock...
Published: 01 October 2018
Figure 3. A comparison of SiO 2 vs. ( a ) MgO and ( b ) K 2 O for natural whole-rock compositions at Chaos Crags (light open gray circles) and liquids that are calculated to be in equilibrium with olivine (Ol) of compositions ranging from Fo 69–82 , clinopyroxene (Cpx; nominally crystallizes
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Isobaric ( P  = 2 kbar) crystallization temperature (°C) and  f  O 2   esti...
Published: 01 October 2018
Figure 10. Isobaric ( P = 2 kbar) crystallization temperature (°C) and f O 2 estimates of Chaos Crags eruptive products calculated using Fe-Ti oxide geothermobarometer of Ghiorso and Evans (2008) ; σ est for Fe-Ti oxides = ±51 °C. Co-CoO and Ni-NiO oxygen buffers calculated using O'Neill
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BSE images of disequilibrium mineral assemblage present within selected Cha...
Published: 01 October 2018
Figure 6. BSE images of disequilibrium mineral assemblage present within selected Chaos Crags mafic enclaves. Replacement of hornblende by clinopyroxene and sieve-textured zoned plagioclase phenocryst present within Dome D mafic enclave ( a ). Coexisting quartz and olivine phenocryst within Dome
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Figure 1. Mineral-scale isotope variations—expressed as Δ function, where Δ...
Published: 01 January 2005
Figure 1. Mineral-scale isotope variations—expressed as Δ function, where Δ = (measured isotope ratio − minimum measured isotope ratio)—among whole rocks (WR) and minerals from example cases to illustrate wide ranges recorded among minerals. References: Chaos Crags— Tepley et al. (1999) ; El
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Figure 4. Compositions of stored versus intruded magma for number of well-d...
Published: 01 July 2000
Figure 4. Compositions of stored versus intruded magma for number of well-documented eruptions. California: Coso, Bacon and Metz (1984) ; Chaos Crags, Heiken and Eichelberger (1980) ; Bishop Tuff, Hildreth (1981) ; Inyo, Vogel et al. (1989) ; and Glass Mountain, Eichelberger (1980) . Wyoming
Journal Article
Published: 01 September 2020
American Mineralogist (2020) 105 (9): 1443–1444.
... allows readers to use the book in different ways. If one is interested in seeing, for example, a shield volcano, or pahoehoe lava, the introductory chapters show where these can be found. A reader taking a lunch break at Chaos Crags can readily find maps, tables, and descriptions of rock types...
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(A)  Plot of apparent viscosity vs. strain for a strain rate stepping exper...
Published: 01 May 2022
Figure 4.7. (A) Plot of apparent viscosity vs. strain for a strain rate stepping experiment on Chaos Crags (USA) dome lava (unpublished data by Kolzenburg et al.). For a given strain rate, the recorded load (and thus also the measured viscosity) initially increases rapidly until reaching
Journal Article
Published: 01 July 1948
Bulletin of the Seismological Society of America (1948) 38 (3): 179–193.
... by the Wood-Anderson instrument at Mineral. Clustered about the flanks of the ancient Mount Tehama are a number of dacite domes, 8which constitute the fourth major zone of faulting. The prin- cipal domes are Eagle Peak, Lassen Peak (fig. 9), and Chaos Crags (fig. 10) on the north flank of Mount Tehama; Bumpas...
Journal Article
Journal: Geology
Published: 01 July 2000
Geology (2000) 28 (7): 603–606.
...Figure 4. Compositions of stored versus intruded magma for number of well-documented eruptions. California: Coso, Bacon and Metz (1984) ; Chaos Crags, Heiken and Eichelberger (1980) ; Bishop Tuff, Hildreth (1981) ; Inyo, Vogel et al. (1989) ; and Glass Mountain, Eichelberger (1980) . Wyoming...
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