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Mantle hydration at the Middle America Trench
Slow isotropic velocities suggest that the oceanic upper-mantle
may be hydrated (serpentinized) by seawater flowing along
bending-related faults at the outer rise of subduction zones,
but accurately estimating the degree of this hydration requires
separating anisotropic effects on seismic wavespeed from the
velocity reduction due to serpentinization alone
(more).
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Thick evaporites and early rifting in Guaymas Basin
The size, shape, and age of a ~2-km-thick
evaporite in the Guaymas Basin place new constraints on the
kinematics and timing of early rifting and marine incursions
in the Gulf of California
(Miller and
Lizarralde, in press, Geology).
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Crustal structure and rift magmatism in Guaymas Basin
Tomographic imaging of the crustal structure across the rifted
margins of the robustly magmatic Guaymas Basin, Gulf of
California, help us better understand the role of mantle melting
and new igneous crustal production in rifts
(poster).
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Sediment diapirs in subduction zones
Numerical experiments constrain timescales for the growth of
diapirs forming in the sediment layer on a subducted
slab (Miller
and Behn, GJI, 2012).
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Imaging oceanic transform faults
Synthetic tests of oceanic transform fault imaging with pre-stack
depth migration of wide-angle, ocean-bottom seismometer data
(poster).
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