Physics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29h..58r&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 8, pp. 58-1, CiteID 1217, DOI 10.1029/2001GL014392
Physics
15
Mineral Physics: High-Pressure Behavior, Geomagnetism And Paleomagnetism: Core Processes (8115), Tectonophysics: Earth'S Interior-Composition And State (1212)
Scientific paper
In-situ high pressure viscosity measurements, using synchrotron X-ray radiography, have been carried out on liquid Fe-S (8.5 wt.% S) at pressures up to 6 GPa and at 1823 K. Here we show that (i) the effect of pressure on the isothermal viscosity is substantial, with an apparent activation volume of 5.8 cm3/mol; and (ii) viscosity is constant along the pressure dependent melting boundary. Assuming the independence of viscosity along the melting boundary up to core pressures, our results yield a viscosity for the Earth's outer core, at the inner core boundary, of 1.6 × 10-2 Pa s. On this basis, we present a revised viscosity profile across the outer core.
Liu Hongjian
Rivers Mark L.
Rutter Michael D.
Secco Richard A.
Sutton Stephen R.
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