R.G.J. Strens's research while affiliated with Newcastle University and other places
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Publications (5)
The electrical conductivity of liquid (Fe90Ni10)3S2 saturated with 2.6 weight percent carbon averages 2.7·105 mho/m at 1000°C and zero pressure. This may imply a slightly lower electrical conductivity for the earth's core than that obtained by extrapolating the properties of pure liquid iron and solid iron alloys to core pressures and temperatures....
The D.C. conductivities of both physical mixtures of Ni+NiO and NiS+_NiO and of chemical mixtures (solid solutions) of (Fe, Mg) olivines and micas rise sharply when the concentration of the more conducting component reaches a critical value of 25 to 35 volume% for the physical mixtures, 33 mole% fayalite for the olivines, and 50 mole% iron end-memb...
A temperature-composition diagram has been constructed for the system MgSiO3 FeSiO3 at 1 atm, using a combination of experimental data obtained at 1100 and 1250° and thermodynamic calculations. From the information contained in thisT-X diagram, and that provided by experimental work on theP-T stability field of orthoferrosilite, and by studies of t...
The crystallisation of olivine (O) and silica (S) normative varieties of Apollo 11 crystalline rocks has been followed at 1 atm. The sequence of phases precipitating is (S): spinel, olivine, ilmenite, clinopyroxene plus plagioclase; and (O): spinel, olivine, ilmenite plus plagioclase, clinopyroxene. The last 50% (O) to 75% (S) of the liquid crystal...
Citations
... The depth of ARGC development can be constrained by the orthopyroxene geobarometer (Wood and Strens, 1971 ) in quartzbearing mafic rocks (gabbronorite–anorthosite, troctolite and monzonite) of the three massifs. According to these data, the batholiths were crystallized at pressures from 2 to 6 kbar, i.e. at depths 7–20 km (Sharkov, 2006 ). ...
Reference: PRECAM rapakivi
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... lowest iron-bearing phlogopite), used as thin sheets, exhibiting very high electrical resistivity. Nonetheless, electrical conduction in micas has been demonstrated in several studies [300][301][302][303][304]. This property is strongly anisotropic [302,305], resistivity measured parallel to the cleavage plan being 2 to 5 orders of magnitude lower than the one measured perpendicular to the cleavage plan. ...
... Their results indicate an upper bound of 2.77 µΩm at CMB conditions and 6.03 µΩm at ICB conditions. Direct measurements at 1 atm up to ∼1,373 K by Johnston and Strens (1973) show comparable results. Assuming ρ at core pressures is smaller than that at 1 atm, Johnston and Strens (1973) suggested that ρ should not exceed 2.0 µΩm for Fe-10 wt% Ni-2.6 wt% C-15 wt% S (hereinafter referred to as Fe10Ni2.6C15S) at core pressures. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/277177187749890-1443095599628_Q64/Malcolm-Johnston-2.jpg)
