Can slab melting be caused by flat subduction

@article{Gutscher2000CanSM,
  title={Can slab melting be caused by flat subduction},
  author={Marcus Gutscher and Ren{\'e} Charles Maury and Jean-Philippe Eissen and Erwan Bourdon},
  journal={Geology},
  year={2000},
  volume={28},
  pages={535-538}
}
Slab melting has been suggested as a likely source of adakitic arc magmas (i.e., andesitic and dacitic magmas strongly depleted in Y and heavy rare earth elements). Existing numerical and petrologic models, however, restrict partial melting to very young (≤ 5 Ma) oceanic crust (typically at 60–80 km depth). Paradoxically, most of the known Pliocene-Quaternary adakite occurrences are related to subduction of 10–45 Ma lithosphere, which should not be able to melt under normal subduction-zone… Expand

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References

SHOWING 1-10 OF 42 REFERENCES
Partial melting of subducting oceanic crust
The conditions under which partial melting of subducting oceanic crust occurs can be determined by combining a partial melting model for basaltic compositions with two-dimensional thermal models ofExpand
Derivation of some modern arc magmas by melting of young subducted lithosphere
MOST volcanic rocks in modern island and continental arcs are probably derived from melting of the mantle wedge, induced by hydrous fluids released during dehydration reactions in the subductedExpand
The geochemistry of young volcanism throughout western Panama and southeastern Costa Rica: an overview
Oblique aseismic subduction below western Panama and southeastern Costa Rica has produced Recent arc-related volcanism. The aseismicity is probably related to the subduction of relatively hot oceanicExpand
Generation of sodium-rich magmas from newly underplated basaltic crust
SODIUM-RICH rocks of trondhjemite–tonalite–dacite (TTD) or –granodiorite (TTG) suites form much of Precambrian continental crust1. They are thought to have formed by partial melting of subductedExpand
Slab melting as an explanation of Quaternary volcanism and aseismicity in southwest Japan
Two volcanoes on the Quaternary volcanic front in southwest Japan have erupted medium-K andesite and dacite, which are chemically similar to adakites (i.e., high Al 2 O 3 , Sr/Y, low Y, and steepExpand
Mount St. Helens: Potential example of the partial melting of the subducted lithosphere in a volcanic arc
Mount St. Helens, 50 km to the west of Mount Adams and the main Cascade volcanic chain, is only 80 km above the subducting oceanic lithosphere. The elevated temperatures off the subducting slab,Expand
Geochemical window into subduction and accretion processes: Raspas metamorphic complex, Ecuador
The high-pressure, low-temperature ( P = 1.3–2 GPa; T is ≤ 600 °C) Raspas metamorphic complex is an exhumed fragment of the partially accreted, partially subducted Amotape-Chaucha terrane inExpand
Fluid-present melting of ocean crust in subduction zones
Phase equilibria were investigated in the pressure range 400–2000 MPa on the Pinatubo dacite, a representative example of natural Cenozoic adakites (slab melts), to constrain the temperature versusExpand
Effect of steeper Archean geothermal gradient on geochemistry of subduction-zone magmas
The comparative study of Archean and post-Archean granitic rocks shows significant changes with time. The high rare-earth element fractionation and the low Yb content of the Archean granitoidsExpand
The effect of oceanic crustal structure on phase changes and subduction
Abstract Recent numerical models for the thermal regime of subduction zones are in disagreement with observations of depth to formation of eclogite, which require higher temperatures than those foundExpand
...
1
2
3
4
5
...