Crustal accretion model for Iceland predicts cold crust
W. Menke and D. Sparks
Geophys. Res. Lett. 13, 1673-1676, 1995
Abstract
We present a self-consistent crustal accretion model of
Iceland that includes heat and mass transfer between an
upwelling, melting mantle and and accreting, cooling
crust. This model predicts sub-solidus crustal temperatures
that are consistent with seismic estimates of the maximum depth
of earthquake hypocenters and mid-crustal shear wave
quality factors, and with geothermal estimates of heat flow.
(Top) Interpretive drawing of crustal accretion in Iceland.
(Bottom) Modeled crustal accretion showing isotherms and flow vectors.
Figures
- Fig. 1 Modeling results. (Left) No hydrothermal convection. (Right) With hydrothermal convection.
(A) Crustal accetion model showing temperature, depletion, melting region and flow vectors. B) Predicted shear wave quality factor
in crust predicted from temperature. C) Predicted telesesimic P wave delays due to mantle temperature, mantle
anisotropy, crustal temperature and mantle depletion. D) Predicted surface heat flow compared to data (dots).
(PostScript version).
- Fig. 2 A) No hydrothermal convection. B) Witah hydrothermal convection. Detail of crustal isotherms and flow vectors (PostScript version).
- Fig. 3 (Top) Interpretive drawing of crustal accretion in Iceland.
(Bottom) Modeled crustal accretion showing isotherms and flow vectors.
(PostScript version).
