Crystallization of oxidized, moderately hydrous arc basalt at mid- to lower-crustal pressures: implications for andesite genesis

Blatter, Dawnika L.; Sisson, T. W.; Hankins, W. B.

doi:10.1007/s00410-013-0920-3

Cited by 195 publications

(167 citation statements)

References 66 publications

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“…The high temperature estimates are also supported by the absence of cumulate amphibole and the high pressure is in agreement with the pyroxene-dominated cumulate assemblages (Blatter et al, 2013;Müntener et al, 2001).…”

Section: Crystallization Pressure and Temperaturesupporting

confidence: 73%

“…Increasing producing pyroxenite-dominated cumulate assemblages. As mentioned before, the differentiation of the Ningcheng melts followed a path of websterites-(Ol −/Hbl-)pyroxenites-gabbros in terms of mineral assemblage, comparable with the solid assemblages left by fractional crystallization of hydrous magmas (Blatter et al, 2013;Müntener et al, 2001;Nandedkar et al, 2014) and cumulates from hydrous arc magmas (Jagoutz et al, 2011) at lower-crustal levels. Plagioclase is absent from the cumulus assemblage of the high-Mg websterites (early fractionation stage), low-Mg websterites and Hbl-pyroxenites (intermediate fractionation stage), and is present in higher proportions during the late differentiation of the magma.…”

Section: A Hydrous Parental Magmasupporting

confidence: 59%

“…Therefore, we suggest that the cumulate unit of the Ningcheng complex records a typical hydrous, high-pressure fractionation sequence. Moreover, the inferred liquid line of descent, with the early appearance of amphibole and the late appearance of plagioclase, also is typical for high-pressure fractionation of parental melts with high initial water contents (at least ≥ 2 wt%) (Blatter et al, 2013;Jagoutz et al, 2011;Müntener et al, 2001). We thus propose that the parental magma of the Ningcheng complex was hydrous.…”

Section: A Hydrous Parental Magmamentioning

confidence: 70%

“…Hydrous minerals (e.g. amphibole) are absent in this stage, probably because of the high temperature of the magmas (~1112°C); hydrous minerals are not stable on the liquidus of such magmas at temperature greater than about 1050°C (Blatter et al, 2013;Müntener et al, 2001). …”

Section: Crystal Fractionation Sequence In the Ningcheng Complexmentioning

confidence: 98%

“…H 2 O is a crucial component in the fractionation sequence of basaltic and basaltic andesitic magmas (Blatter et al, 2013;Gaetani et al, 1993;Müntener et al, 2001). At crustal pressures, a low H 2 O concentration in the liquid stabilizes plagioclase earlier than pyroxene and amphibole, which results in crystallization being dominated by olivine + plagioclase.…”

Section: A Hydrous Parental Magmamentioning

confidence: 99%

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High-Mg adakitic rocks and their complementary cumulates formed by crystal fractionation of hydrous mafic magmas in a continental crustal magma chamber

Zheng

et al. 2016

Lithos

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Section: Crystallization Pressure and Temperaturesupporting

confidence: 73%

Section: A Hydrous Parental Magmasupporting

confidence: 59%

Section: A Hydrous Parental Magmamentioning

confidence: 70%

Section: Crystal Fractionation Sequence In the Ningcheng Complexmentioning

confidence: 98%

Section: A Hydrous Parental Magmamentioning

confidence: 99%

See 3 more Smart Citations

High-Mg adakitic rocks and their complementary cumulates formed by crystal fractionation of hydrous mafic magmas in a continental crustal magma chamber

Zheng

et al. 2016

Lithos

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What processes control the chemical compositions of arc front stratovolcanoes?

Turner

Langmuir

2015

Geochem Geophys Geosyst

105

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Arc front stratovolcanoes have global chemical systematics that constrain processes at convergent margins. Positive correlations exist for arc averages among ''fluid mobile,'' ''high field strength,'' and ''large ion lithophile'' elements. 143 Nd/ 144 Nd and 87 Sr/ 86 Sr from rear-arc lavas lacking subduction signature align with the oceanic ''mantle array,'' and correlate with arc front 143 Nd/ 144 Nd. Most chemical parameters (but not isotopes) also correlate well with crustal thickness and slightly less well with the slab thermal parameter, but not with the depth of the slab nor model slab surface temperatures. Successful models of arc volcanism should account for these global regularities. Two distinct models can quantitatively account for the observationsdifferent extents of melting of the mantle wedge caused by variations in wedge thermal structure, or varying contributions from the subducting slab owing to variations in the slab thermal structure. Both successful model scenarios require a significant flux of melted ocean crust to the mantle source of all volcanic arcs. The wedge melting model has constant contributions from ocean crust, sediment, and mantle wedge to lavas globally, while the slab model varies slab contributions with slab temperature. The wedge melting model fit improves by incorporating convergence rate and slab dip, which should affect the wedge thermal structure; the slab model is not supported by a similar analysis. The wedge model also more easily accommodates the isotope data. The two models predict different primary H 2 O contents, with large variations in H 2 O for the wedge model, and relatively constant H 2 O for the slab model. An evaluation of the effects of varying sediment compositions on arc lavas will benefit from considering the very different consequences of the two models.

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Comb layering monitors decompressing and fractionating hydrous mafic magmas in subvolcanic plumbing systems (Fisher Lake, Sierra Nevada, USA)

McCarthy

Müntener

2016

JGR Solid Earth

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Understanding the dynamics of volcanic eruptions requires constraints on the processes of melt extraction in shallow magma reservoirs. This study focuses on the formation of intraplutonic igneous layering known as comb layers and orbicules within the Fisher Lake Pluton, Sierra Nevada. Comb layers are mineralogically and texturally diverse, ranging from plagioclase‐amphibole comb layers to plagioclase‐pyroxene and olivine comb layers. The majority of individual layers are related to the initiation of plagioclase nucleation and growth on preexisting host rocks and remobilized xenoliths. We use simple phase diagrams to illustrate the formation of comb layers through crystal fractionation along conduit walls and xenoliths, with plagioclase as the liquidus phase. Near‐adiabatic ascent of water‐undersaturated melts through the crust will lead to superheating and crystal resorption, which upon saturation of volatiles at shallow depth can induce heterogeneous nucleation of plagioclase. The rarity of orbicules and comb layers worldwide suggests that adiabatic decompression of crystal‐poor, moderately hydrous melts through the crust is rare. Most melts in intermediate/silicic volcanoes crystallize in multiple reservoirs within the crust prior to emplacement at shallow depth as crystal‐bearing melts. Comb layers and orbicules preserve evidence of multiple melt injections where a sequence of texturally and mineralogically similar comb layers and orbicules reflect the timescale of an individual melt pulse. Short timescales on the order of months to years for the growth of these sequences are estimated using experimental plagioclase growth rates and are interpreted as representing the lifetime of a melt injection within a long‐lived, subvolcanic melt extraction zone.

show abstract

Crystallization of oxidized, moderately hydrous arc basalt at mid- to lower-crustal pressures: implications for andesite genesis

Cited by 195 publications

References 66 publications

High-Mg adakitic rocks and their complementary cumulates formed by crystal fractionation of hydrous mafic magmas in a continental crustal magma chamber

High-Mg adakitic rocks and their complementary cumulates formed by crystal fractionation of hydrous mafic magmas in a continental crustal magma chamber

What processes control the chemical compositions of arc front stratovolcanoes?

Comb layering monitors decompressing and fractionating hydrous mafic magmas in subvolcanic plumbing systems (Fisher Lake, Sierra Nevada, USA)

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