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Title: Implications of Sound Velocities of Natural Topaz on the Seismic L–Discontinuity

Journal Article · · Geophysical Research Letters

Compressional and shear wave velocities of topaz have been measured by ultrasonic interferometry in a multi-anvil apparatus up to 13 GPa at room temperature. By fitting the measured velocities under pressure to finite strain equations, the elastic moduli of topaz and their pressure derivatives were obtained, yielding KS0 = 165.5 (25) GPa, KS' = 2.9 (1), G0 = 116.5 (17) GPa, and G' = 1.0 (1). Modeling of the velocity profiles of subducted sediments suggests that at 8 GPa (~240 km depth) the P- and S- wave velocities of the subducted sediments exhibit a first order increase of 10% and 11%, respectively. Furthermore, the comparison between seismic observations and velocity contrasts of sediment + MORB model at 240 km shows dehydration of a 1.5–3.9 km thick sediment layer can potentially contribute to the seismically observed Lehmann discontinuity in Tonga, Japan, Philippine Sea, South America, Indonesia, and South Shetland subduction zones.

Research Organization:
State Univ. of New York (SUNY), Stony Brook, NY (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0004085; NA0003886
OSTI ID:
1963553
Report Number(s):
DOE-SUNYSB-NA4085
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 2 Vol. 49; ISSN 0094-8276
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

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