Volatile contents of mafic magmas from cinder cones in the Central Oregon High Cascades: Implications for magma formation and mantle conditions in a hot arc

Ruscitto, D. M.; Wallace, Paul; Johnson, E. R.; Kent, Adam J.R.; Bindeman, Ilya N.

doi:10.1016/j.epsl.2010.07.037

Cited by 80 publications

(67 citation statements)

References 66 publications

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“…Shasta. Analyses of the petrology [Grove et al, , 2005 and melt inclusions in these samples [Ruscitto et al, 2010] suggest they have at least 6-8 wt% H 2 O. Some of these magmas bypass the main conduit system and erupt as satellite vents.…”

Section: Model For the Mt Shasta Magmatic Systemmentioning

confidence: 99%

“…Therefore the magmas being fed into the Mt. Shasta plumbing system are H 2 O-rich magmas, and the phase equilibrium constraints require minimum H 2 O contents significantly higher than the amounts preserved in melt inclusions in olivine phenocrysts [Anderson, 1974, Ruscitto et al, 2010, Sisson and Layne, 1993 contents that are at 14 wt% (Fig 4-12 Studies of basalts and basaltic andesites from the South Cascade region have revealed evidence for variable pre-eruptive water contents and temperatures that range from 8 to <1 wt% H 2 O and 1000-1250…”

Section: Evidence From Amphibole For High Magmatic H 2 O In Primary Mmentioning

confidence: 99%

“…These lavas represent primitive inputs into the Mt. Shasta plumbing system and are both hydrous with pre-eruptive H 2 O contents between 3 and 6 wt% H 2 O [Anderson, 1974, Ruscitto et al, 2010.…”

Section: Experiments 421 Starting Materialsmentioning

confidence: 99%

“…This is the high-silica (57 wt% SiO 2 ), high-MgO (9 wt% MgO), high Mg# (0.75) end member of a suite of primitive lavas from the Mt. Shasta region that have Mg#'s >0.7, and contains Fo 94 olivine antecrysts [Baker et al, 1994, Ruscitto et al, 2010.…”

Section: Experiments 421 Starting Materialsmentioning

confidence: 99%

“…Shasta is an important volcano in the context of global subduction zone magmatism because primitive melts in equilibrium with a mantle mineral assemblage are preserved at monogenetic cinder cones in the greater Shasta region [Baker et al, 1994, and the fact that high pre-eruptive H 2 O contents have been inferred for lavas erupted from Shastina (a large vent on the flank of Mt. Shasta) by melt inclusion studies [Anderson, 1974], the primitive lavas by melt inclusions [Ruscitto et al, 2010], the petrology of the primitive magmas [Grove et al, 2005], and experiments [McCanta et al, 2007].…”

Section: Introductionmentioning

confidence: 99%

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Experimental studies of melting and crystallization processes in planetary interiors

Krawczynski¹

2011

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Melting and crystallization processes on the Earth and Moon are explored in this thesis, and the topics of melt generation, transport, and crystallization are discussed in three distinct geologic environments: the Moon's mantle, the Greenland ice sheet, and the Earth's crust. Experiments have been conducted to determine the conditions of origin for two high-titanium magmas from the Moon. The lunar experiments (Chapter 2) were designed to explore the effects of variable oxygen fugacity (f O 2 ) on the high pressure and high temperature crystallization of olivine and orthopyroxene in high-Ti magmas. The results of these experiments showed that the source regions for the high-Ti lunar magmas are distributed both laterally and vertically within the lunar mantle, and that it is critical to estimate the pre-eruptive oxygen fugacity in order to determine true depth of origin for these magmas within the lunar mantle. Chapter 3 models the behavior of water flow through the Greenland ice sheet driven by hydrofracture of water through ice. The results show that melt water in the ablation zone of Greenland has almost immediate access to the base of the ice sheet in areas with up two kilometers of ice. Chapter 4 is an experimental study of two hydrous high-silica mantle melts from the Mt. Shasta, CA region. Crystallization is simulated at H 2 O saturated conditions at all crustal depths, and a new geobarometerhygrometer based on amphibole magnesium number is calibrated. In Chapter 5 I use the new barometer to study a suite of mafic enclaves from the Mt. Shasta region, and apply it to amphiboles in these enclaves. Evidence for pre-eruptive H 2 O contents of up to 14 wt% is presented, and bulk chemical analyses of the inclusions are used to show that extensive magma mixing has occurred at all crustal depths up to 35 km beneath Mt. Shasta. Tim Grove. I can never repay all the knowledge, time, trust, friendship, and guidance that you have freely given to me. You are more than an advisor; you made me feel like family. Your endless energy and passion for petrology has rubbed off on me, and has reinforced my desire to pursue the origins of igneous rocks. The time we spent in the field is the most fun I have ever had, and has taught me that geology necessarily happens in the field as well as the lab. Those experiences will shape the future of my geologic career. In the lab you trusted me to make my own scientific decisions, and then patiently helped me fix all the equipment I broke and set me straight on some of the wacky decisions I made! You read all of the early drafts of this thesis, practiced all my talks over and over with me, and at times I know it was painful, but you shaped me into a scientist. I am truly honored that my thesis will always sit right above your desk, with all of your great students. I hope that someday I will live up to your expectations of me and I promise to pass on the dedication and care to my own students that you have showed me. In the future, stop by for a visit in my thermodynamics/petrology/...

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Section: Model For the Mt Shasta Magmatic Systemmentioning

confidence: 99%

Section: Evidence From Amphibole For High Magmatic H 2 O In Primary Mmentioning

confidence: 99%

Section: Experiments 421 Starting Materialsmentioning

confidence: 99%

Section: Experiments 421 Starting Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental studies of melting and crystallization processes in planetary interiors

Krawczynski¹

2011

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Reconciling mantle wedge thermal structure with arc lava thermobarometric determinations in oceanic subduction zones

Perrin

Goes

Prytulak

et al. 2016

Geochem Geophys Geosyst

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Subduction zone mantle wedge temperatures impact plate interaction, melt generation, and chemical recycling. However, it has been challenging to reconcile geophysical and geochemical constraints on wedge thermal structure. Here we chemically determine the equilibration pressures and temperatures of primitive arc lavas from worldwide intraoceanic subduction zones and compare them to kinematically driven thermal wedge models. We find that equilibration pressures are typically located in the lithosphere, starting just below the Moho, and spanning a wide depth range of 25 km. Equilibration temperatures are high for these depths, averaging 13008C. We test for correlations with subduction parameters and find that equilibration pressures correlate with upper plate age, indicating overriding lithosphere thickness plays a role in magma equilibration. We suggest that most, if not all, thermobarometric pressure and temperature conditions reflect magmatic reequilibration at a mechanical boundary, rather than reflecting the conditions of major melt generation. The magma reequilibration conditions are difficult to reconcile, to a first order, with any of the conditions predicted by our dynamic models, with the exception of subduction zones with very young, thin upper plates. For most zones, a mechanism for substantially thinning the overriding plate is required. Most likely thinning is localized below the arc, as kinematic thinning above the wedge corner would lead to a hot fore arc, incompatible with fore-arc surface heat flow and seismic properties. Localized subarc thermal erosion is consistent with seismic imaging and exhumed arc structures. Furthermore, such thermal erosion can serve as a weakness zone and affect subsequent plate evolution.

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Light Stable Isotopic Compositions of Enriched Mantle Sources: Resolving the Dehydration Paradox

Dixon

Bindeman

Kingsley

et al. 2017

Geochem Geophys Geosyst

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Volatile and stable isotope data provide tests of mantle processes that give rise to mantle heterogeneity. New data on enriched mid‐oceanic ridge basalts (MORB) show a diversity of enriched components. Pacific PREMA‐type basalts (H2O/Ce = 215 ± 30, δDSMOW = −45 ± 5 ‰) are similar to those in the northern Atlantic (H2O/Ce = 220 ± 30; δDSMOW = −30 to −40 ‰). Basalts with EM‐type signatures have regionally variable volatile compositions. Northern Atlantic EM‐type basalts are wetter (H2O/Ce = 330 ± 30) and have isotopically heavier hydrogen (δDSMOW = −57 ± 5 ‰) than northern Atlantic MORB. Southern Atlantic EM‐type basalts are damp (H2O/Ce = 120 ± 10) with intermediate δDSMOW (−68 ± 2 ‰), similar to δDSMOW for Pacific MORB. Northern Pacific EM‐type basalts are dry (H2O/Ce = 110 ± 20) and isotopically light (δDSMOW = −94 ± 3 ‰). A multistage metasomatic and melting model accounts for the origin of the enriched components by extending the subduction factory concept down through the mantle transition zone, with slab temperature a key variable. Volatiles and their stable isotopes are decoupled from lithophile elements, reflecting primary dehydration of the slab followed by secondary rehydration, infiltration, and re‐equilibration by fluids derived from dehydrating subcrustal hydrous phases (e.g., antigorite) in cooler, deeper parts of the slab. Enriched mantle sources form by addition of <1% carbonated eclogite ± sediment‐derived C‐O‐H‐Cl fluids to depleted mantle at 180–280 km (EM) or within the transition zone (PREMA).

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Volatile contents of mafic magmas from cinder cones in the Central Oregon High Cascades: Implications for magma formation and mantle conditions in a hot arc

Cited by 80 publications

References 66 publications

Experimental studies of melting and crystallization processes in planetary interiors

Experimental studies of melting and crystallization processes in planetary interiors

Reconciling mantle wedge thermal structure with arc lava thermobarometric determinations in oceanic subduction zones

Light Stable Isotopic Compositions of Enriched Mantle Sources: Resolving the Dehydration Paradox

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