Strontium isotopic and selected trace element variations between two Aleutian volcanic centers (Adak and Atka): implications for the development of arc volcanic plumbing systems

Myers, James D.; Marsh, Bruce D.; Sinha, A. K.

doi:10.1007/bf00413349

Cited by 108 publications

(39 citation statements)

References 29 publications

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“…Kay [12] suggested that the reverse zonation in cpx phenocrysts was produced by reaction between a silicic melt of the subducting slab and hot peridotite in the mantle wedge. This interpretation is similar to that proposed by Myers [8], and Myers and Frost [8] for a wide variety of chemical and petrographic features in Aleutian volcanic rocks. Yogodzinski et al [13] suggested a model in which reverse major element zonation in adakite cpx might be produced by the mixing of a silicic melt from the slab and a primitive basaltic melt of the mantle wedge.…”

Section: The Genesis Of Adakites and Adakitic Rockssupporting

confidence: 63%

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Slab melting in the Aleutians: implications of an ion probe study of clinopyroxene in primitive adakite and basalt

Yogodzinski

Kelemen

1998

Earth and Planetary Science Letters

192

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An ion probe study of trace elements in Mg-rich clinopyroxene phenocrysts in primitive Aleutian lavas provides constraints on the genesis of Aleutian adakites, and possible insights into the source of common Aleutian magmas. Clinopyroxene (cpx) phenocrysts in the primitive adakites have high Sr and Nd=Yb compared to cpx in Aleutian basalts. In the adakites, Sr and Nd=Yb are highest for high Mg# cpx, and these concentrations decrease toward lower Mg# compositions. These trends are the opposite of those seen in basalt cpx which generally show increasing incompatible trace element contents with decreasing Mg#, and are unlike antithetic compatible-incompatible trace element trends produced by chemical or kinetic effects of crystal growth. Petrographic observations and major and trace element zonation in cpx phenocrysts indicate that primitive Aleutian adakites are in part the product of mixing between primitive and relatively evolved magmas. The adakite trace element signature (high Sr, Nd=Yb) is clearly associated with the primitive mixing end-member. This observation supports the idea that adakites are derived by equilibration of slab melts with mantle olivine, and appears to rule out an origin by melting in the lower crust. Adakites are relatively rare in the Aleutians, but arc-wide correlations between Sr and La=Yb indicates that an adakite-type slab melt component may be present in the magmatic source throughout the arc.

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Section: The Genesis Of Adakites and Adakitic Rockssupporting

confidence: 63%

“…The classic model of Green and Ringwood [1] suggested that abundant calc-alkaline andesite found in volcanic arcs was and co-workers continuously espoused an important role for slab melting in arc magmatism (e.g. [8,9]). …”

Section: Introductionmentioning

confidence: 99%

Slab melting in the Aleutians: implications of an ion probe study of clinopyroxene in primitive adakite and basalt

Yogodzinski

Kelemen

1998

Earth and Planetary Science Letters

192

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“…The chromatographic column is a useful point of reference for thinking about the nature of this interaction. A number of authors (e.g., Nicholls and Ringwood 1973;Marsh and Kantha 1978;Mysen 1979) have anticipated aspects of the consequences of this process, and Myers et al (1985) discuss an example where they think they can see petrochemical features that have time dependencies similar to those that might be expected in the output of a chromatographic system.…”

Section: Discussionmentioning

confidence: 99%

Geochemical Consequences of Melt Percolation: The Upper Mantle as a Chromatographic Column

Navon

Stolper

1987

The Journal of Geology

624

254

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As magmas rise toward the surface, they traverse regions of the mantle and crust with which they are not in equilibrium; to the extent that time and the intimacy of their physical contact permit, the melts and country rocks will interact chemically. We have modeled aspects of these chemical interactions in terms of ion-exchange processes similar to those operating in simple chromatographic columns. The implications for trace element systematics are straightforward: the composition of melt emerging from the top of the column evolves from close to that of the incipient melt of the column matrix toward that of the melt introduced into the base of the column. The rate of evolution is faster in the incompatible than the compatible elements and, as a result, the abundance ratios of elements of different compatibilities can vary considerably with time.

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“…Only through repeated, long term use do the ultimate source charateristics become clear (e.g. Myers et al, 1985). And the restricted size range of mafic minerals in both magmas and cumulate piles may ultimately reflect (1) a delicate balance between magma ascent rate and the size of crystals entrained, and (2) the time spent by crystals in propagating solidification fronts.…”

Section: Magma Chambers As Solidification Frontsmentioning

confidence: 99%

Solidification fronts and magmatic evolution

1996

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From (3. F. Becker's and L. V. Pirsson's early enunciations linking the dynamics of magma chambers to the rock records of sills and plutons to this day, two features stand at the centre of nearly every magmatic process: solidification fronts and phenocrysts. The structure and behaviour of the envisioned solidification front, however, has been mostly that akin to non-silicate, non-multiply-saturated systems, which has led to confusion in appreciating its role in magmatic evolution. The common habit of intruding magmas to carry significant amounts of phenocrysts, which can lead to efficient ffactionation, layering, and interstitial melt flow within extensive mush piles, when coupled with solidification fronts, allows a broad understanding of the processes leading to the rock records of sills and lava lakes. These same processes are fundamental to understanding all magmas.The spatial manifestation of the liquidus and solidus is the Solidification Front (SF); all magmas, stationary or in transit, are encased by SFs. In the ideal case of an initially crystal-free, cooling magma, crystallinity increases from nucleation on the leading liquidus edge to a holocrystalline rock at the trailing solidus. The package of SF isotherms advances inward, thickening with time and, depending on location --roof, floor, or walls --and the initial crystallinity of the magma, is instrumental in controlling magmatic evolution. Bimodal volcanism as well as much of the structure of the oceanic crust may arise from the behaviour of SFs.In mafic magmas, somewhere near a crystallinity (N) of 55% (vol), depending on the phase assemblage, the SF changes from a viscous fluid (suspension (0

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Strontium isotopic and selected trace element variations between two Aleutian volcanic centers (Adak and Atka): implications for the development of arc volcanic plumbing systems

Cited by 108 publications

References 29 publications

Slab melting in the Aleutians: implications of an ion probe study of clinopyroxene in primitive adakite and basalt

Slab melting in the Aleutians: implications of an ion probe study of clinopyroxene in primitive adakite and basalt

Geochemical Consequences of Melt Percolation: The Upper Mantle as a Chromatographic Column

Solidification fronts and magmatic evolution

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