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Subduction factory: 2

Subduction factory: 2,B. R. Hacker,S. M. Peacock,G. A. Abers,S. D. Holloway

Subduction factory: 2   (Citations: 24)
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    • ...These are compared to the temperature at the top of the slab and at the bottom of the thickened oceanic crust (black lines) and the lawsonite–dehydration curves suggested by field relations [30], experiments [31] and thermodynamic calculations [32]...
    • ...Blue lines indicate petrological constraints on the lawsonite-out boundary based on field relations (H03) [30], from experiments (SP98) [31] and from thermodynamic calculations (CK02) [32]...
    • ...There is some uncertainty in the actual location of this reaction boundary; field relations indicate lawsonite breaks down in mafic rocks at b500 8C [30], while experiments [31] and thermodynamic calculations [32] indicate that lawsonite is stable up to 600–700 8C. The dehydration reaction appears to be complex and continuous below the lawsonite-boundary [31], potentially complicating the distribution of available H2O...
    • ...Given these uncertainties, the seismicity could be associated with lawsonite breakdown, or along some other similar univariant reaction (for example, serpentine in ultramafic rocks breaks down at similar temperatures [30])...

    Geoffrey A. Aberset al. The thermal structure of subduction zones constrained by seismic imagi...

    • ...As the oceanic lithosphere subducts it undergoes a series of metamorphic phase transformations that release H2O (Peacock 1996; Hacker et al. 2003a)...
    • ...We computed the equilibrium mineralogy of the subducting Cocos Plate for northern and central Costa Rica using the method of Hacker (1996) and Hacker et al. (2003a) (Fig. 13)...
    • ...Velocities obtained following this approach are within 1‐2 per cent of rock velocities measured by laboratory experiments (Hacker et al. 2003a)...
    • ...Predicted velocities are based on the maximum thermodynamically possible H2O content, which in reality can certainly yield higher velocities (Hacker et al. 2003a)...

    S. Husenet al. Subduction-zone structure and magmatic processes beneath Costa Rica co...

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