Mathematics – Logic
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.124...75j&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 124, no. 1, p. 75-94
Mathematics
Logic
10
Lithosphere, Mid-Ocean Ridges, Ocean Bottom, Rheology, Subduction (Geology), Tectonics, Basalt, Mathematical Models, Olivine, Perovskites, Spinel, Temperature Distribution
Scientific paper
The subducting oceanic lithosphere, which was formed by petrological differentiation of pyrolite at mid-ocean spreading centers, is in this paper no longer considered as a compositionally and mechanically homogeneous rigid plate or viscous slab as it was in earlier papers, but as a sandwich made up of different lithological layers. The effect of phase transformation as a function of depth with respect to changes in rheology of the downgoing slab is also considered. It is shown that the rheological behavior of the descending slab is strongly controlled by its lithological and thermal structure. Our results provide alternative and plausible interpretations for the distribution of seismicity within the Wadati-Benioff zone and for the fate of subducted oceanic lithosphere at the 670 km discontinuity. These results, although they are limited by the availability and quality of thermodynamical and rheological parameters for different rock types, will advance our understanding of rheological properties of the subducting oceanic lithosphere.
Ji Shaocheng
Zhao Pinglao
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