Daly Gaps at South Sister, Oregon, USA, generated via partial melting

Waters, L. E.; Andrews, B. J.; Frey, H. V.

doi:10.1007/s00410-021-01805-5

Cited by 8 publications

(2 citation statements)

References 136 publications

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“…After filtering, we were only able to obtain N = 6 Cpx from the Matthieu Lakes Fissure transecting North Sister from Schmidt and Grunder (2011), and N = 11 Cpx from South Sister dacites from Waters et al. (2021). The small number of analyses make it harder to average out the effects of analytical uncertainty; the available data suggests storage centered around 1 kbar at North Sister and ∼2 kbar at South Sister, although these differences are certainly within uncertainty of one another, and individual analyses show substantial overlap between the two centers.…”

Section: Three Sistersmentioning

confidence: 99%

Geophysical and Geochemical Constraints on Magma Storage Depths Along the Cascade Arc: Knowns and Unknowns

Wieser,

Kent,

Till

et al. 2023

Geochem Geophys Geosyst

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The iconic volcanoes of the Cascade arc stretch from Lassen Volcanic Center in northern California, through Oregon and Washington, to the Garibaldi Volcanic Belt in British Columbia. Recent studies have reviewed differences in the distribution and eruptive volumes of vents, as well as variations in geochemical compositions and heat flux along strike (amongst other characteristics). We investigate whether these along‐arc trends manifest as variations in magma storage conditions. We compile available constraints on magma storage depths from InSAR, geodetics, seismic inversions, and magnetotellurics for each major edifice and compare these to melt inclusion saturation pressures, pressures calculated using mineral‐only barometers, and constraints from experimental petrology. The availability of magma storage depth estimates varies greatly along the arc, with abundant geochemical and geophysical data available for some systems (e.g., Lassen Volcanic Center, Mount St. Helens) and very limited data available for other volcanoes, including many which are classified as “very high threat” by the USGS (e.g., Glacier Peak, Mount Baker, Mount Hood, Three Sisters). Acknowledging the limitations of data availability and the large uncertainties associated with certain methods, available data are indicative of magma storage within the upper 15 km of the crust (∼2 ± 2 kbar) beneath the main edifices. These findings are consistent with previous work recognizing barometric estimates cluster within the upper crust in many arcs worldwide. There are no clear offsets in magma storage between arc segments that are in extension, transtension or compression, although substantially more petrological work is needed for fine scale evaluation of storage pressures.

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Section: Three Sistersmentioning

confidence: 99%

Geophysical and Geochemical Constraints on Magma Storage Depths Along the Cascade Arc: Knowns and Unknowns

Wieser,

Kent,

Till

et al. 2023

Geochem Geophys Geosyst

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“…The lack of seismic constraints on magma storage is not surprising; the seismic network at Crater Lake was non-existent for more than 20 years in the late 1980s to mid 2000s (Fig. manuscript submitted to Geochemistry, Geophysics, Geosystems Mineral Compositions: We were only able to compile N=6 Cpx from the Matthieu Lakes Fissure transecting North Sister from Schmidt and Grunder (2011), and N=11 Cpx from South Sister dacites from Waters et al (2021). The small number of analyses make it harder to average out the effects of analytical uncertainty; the available data suggests storage centred around 1 kbar at North Sister and ~2 kbar at South Sister, although these differences are certainly within uncertainty of one another, and individual analyses show substantial overlap between the two centers.…”

Section: Geophysicsmentioning

confidence: 99%

Geophysical and Geochemical Constraints on Magma Storage Depths along the Cascade Arc: Knowns and Unknowns

Wieser¹,

Kent²,

Till³

et al. 2024

Preprint

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The iconic volcanoes of the Cascade arc stretch from Lassen Volcanic Center in northern California, through Oregon and Washington, to the Garibaldi Volcanic Belt in British Columbia. Recent studies have reviewed differences in the distribution and eruptive volumes of vents, as well as variations in geochemical compositions and heat flux along strike (amongst other characteristics). We investigate whether these along-arc variations manifest as variations in magma storage conditions. We compile available constraints on magma storage depths from InSAR, geodetics, seismic inversions, and magnotellurics for each major edifice, and compare these to melt inclusion saturation pressures, pressures calculated using mineral-only barometers, and constraints from experimental petrology. The availability of magma storage depth estimates varies greatly along the arc, with abundant geochemical and geophysical data available for some systems (e.g. Lassen Volcanic Center, Mt. St. Helens), and very limited data available for other volcanoes, including many which are classified as “very high threat” by the USGS (e.g., Glacier Peak, Mt. Baker, Mt. Hood, Three Sisters). Acknowledging the limitations of data availability and the large uncertainties associated with certain methods, available data is indicative of magma storage within the upper 15 km of the crust (~2 ± 2 kbar). These findings are consistent with previous work recognising barometric estimates cluster within the upper crust in many arcs worldwide. There are no clear offsets in magma storage between arc segments that are in extension, transtension or compression, although substantially more petrological work is needed for fine scale evaluation of storage pressures.

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Contrasting magmatic evolutions of the Three Sister Volcanoes reflect increased heat flow, crustal melting and silicic magmatism in the Central Oregon Cascade Arc

et al. 2023

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Daly Gaps at South Sister, Oregon, USA, generated via partial melting

Cited by 8 publications

References 136 publications

Geophysical and Geochemical Constraints on Magma Storage Depths Along the Cascade Arc: Knowns and Unknowns

Geophysical and Geochemical Constraints on Magma Storage Depths Along the Cascade Arc: Knowns and Unknowns

Geophysical and Geochemical Constraints on Magma Storage Depths along the Cascade Arc: Knowns and Unknowns

Contrasting magmatic evolutions of the Three Sister Volcanoes reflect increased heat flow, crustal melting and silicic magmatism in the Central Oregon Cascade Arc

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