Elastic wave velocities in isochemical granulite and amphibolite: Origin of a low‐velocity layer at the slab/mantle wedge interface | Zendy

Tatsumi Y. | Zendy; Ito K. | Zendy; Goto A. | Zendy

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Elastic wave velocities in isochemical granulite and amphibolite: Origin of a low‐velocity layer at the slab/mantle wedge interface

Author(s) -

Tatsumi Y.,

Ito K.,

Goto A.

Publication year - 1994

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/93gl03171

Subject(s) - granulite , slab , geology , mantle (geology) , subduction , mantle wedge , metamorphic facies , shear (geology) , geochemistry , petrology , geophysics , seismology , geomorphology , tectonics , facies , structural basin

Simultaneous measurements of compressional and shear wave velocities, Vp and Vs, in granulite and amphibolite with identical chemistry were carried out from room temperature to 850°C at 1 GPa. Both Vp and Vs in granulite and amphibolite decreased linearly with increasing temperature. The values of Vp and Vs at 700°C are 7.75 km/s and 4.37 km/s for granulite, and 7.40 km/s and 4.21 km/s for amphibolite, respectively. 3–4 % lowering of elastic wave velocities in hydrous amphibolite compared with anhydrous granulites may be consistent with seismological observations indicating the presence of a low‐velocity layer at the slab/mantle wedge interface in subduction zones.

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