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The Geological Society of America Journal Geology: Dynamic geoscience
Date:2/12/2013

p://dx.doi.org/10.1130/G33834.1.

Mantle rocks, such as peridotite and serpentinite, are rarely exposed on the Earth's surface. In a case where mantle rocks are distributed in deeply subducted and metamorphosed regions, there are two possible origins for mantle rocks: lower part (footwall-side) or upper part (hanging-wall-side) of the subduction boundary. This footwall-hanging-wall problem has been rarely conclusive. In a classic high-pressure metamorphic belt, the Sambagawa belt, Japan, it has been revealed by wide-ranging field studies that mantle-rock bodies are common in the higher-pressure (deeper) part of the belt but are nearly absent in the low-pressure (shallower) part. If the mantle rocks originated in the footwall, they should be metamorphosed together with the subducted material, and their distribution should not show any correlation with metamorphic pressure. The restricted distribution, therefore, is strong evidence for hanging-wall mantle-wedge origin of the mantle rocks, indicating that subducted oceanic plate can transport substantial amount of hanging-wall material to the Earth's surface. Metamorphic pressure of the boundary region between the mantle-rock present and absent areas is known to be 8.0 to 9.5 kbar, and the corresponding depth (~30 to 35 km) represents the thickness of the continental crust in the Cretaceous Sambagawa subduction zone


Effect of phase transitions on seismic properties of metapelites: A new high-temperature laboratory calibration Alba S. Zappone, Institute for Process Engineering, Swiss Federal Institute of Technology, Zurich 8092, Switzerland, and Philip M. Benson. Posted online 7 Feb. 2013; http://dx.doi.org/10.1130/G33713.1.

Phase transitions are a common phenomenon in all materials, including geological minerals. Of these minerals, arguably the most important in crustal rock-forming processes is quartz. Alba S. Z
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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