Do the rocks on the subducting plate subduct as a relatively coherent sequence of lithosphere?

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Presentation transcript:

What is the nature of the interface between the plates in a subduction zone?

Do the rocks on the subducting plate subduct as a relatively coherent sequence of lithosphere? Photos courtesy of Sarah Penniston-Dorland Subduction-related rocks from some localities, e.g. the Alps are found in large part as large sheets of oceanic lithosphere that are fault-bounded.

Do the rocks at the interface become sheared and mixed together? Photos courtesy of Sarah Penniston-Dorland Block Mélange Matrix Mélange Mélange Matrix Block Block Mélange Matrix Subduction-related rocks from other localities, e.g. California are found as jumbled mafic, ultramafic, and sedimentary blocks that are surrounded by fine-grained matrix in mélange zones.

Endmember behaviors of rocks within subduction zone http://www.lehigh.edu/~geb0/BeboutFrontiersEPSL07.pdf Coherent Melange (Redrawn after Bebout, 2007)

Resources Bebout, G.E., 2007, Metamorphic chemical geodynamics of subduction zones, Earth and Planetary Science Letters, 260, 373-393. http://www.lehigh.edu/~geb0/BeboutFrontiersEPSL07.pdf