Soret effect

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The results of <b>Soret</b> experiments performed by  Brenan and Bennett (2010)  i...
Published: 01 January 2016
Figure 3 The results of Soret experiments performed by Brenan and Bennett (2010) in the Fe–Ni–S system. Panel (a) displays the change in sulfur content as a function of T along the sample length, that arises due to the Soret effect. Panel (b) displays the corresponding gradients in Re
Series: Geological Society, London, Special Publications
Published: 01 January 2002
DOI: 10.1144/GSL.SP.2002.192.01.05
EISBN: 9781862394407
... rocks' (Bowen 1915 c ). He disputed the importance of the Soret effect, dismissed the importance of liquid immiscibility, and opposed the idea that magmas undergo gravitative differentiation in the liquid state. Bowen also questioned whether assimilation played the dominant role accorded...
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Journal Article
Published: 01 August 2005
Clays and Clay Minerals (2005) 53 (4): 361-371.
... positions listed in Table 2 . The vibrational modes associated with the chromophoric groups, therefore, will be selectively enhanced for each of the three absorptions in the Soret region. Since resonance Raman spectroscopy is sensitive to protonation, distortions and environment effects, as mentioned above...
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Journal Article
Published: 01 October 2010
Clays and Clay Minerals (2010) 58 (5): 667-681.
... phenomenon which may create a concentration gradient (the Soret effect: Chipman, 1926 ) and is a function of temperature, temperature gradient, and the nature of the chemical elements ( e.g. Rosanne et al. , 2003 ). The effect of a thermal gradient on clay products in conditions close to those of a HLW...
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Journal Article
Journal: Geophysics
Published: 31 May 2016
Geophysics (2016) 81 (4): E243-E257.
... diffuse from high concentration to low concentration because of the number of collisions associated with the random walks of the species in the pore water (thermal agitation). (b) During thermally driven diffusion (the Soret effect), the species diffuse from high to low temperature because of the increase...
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Journal Article
Published: 01 August 2015
American Mineralogist (2015) 100 (8-9): 1762-1777.
... not vary across this boundary layer. Previous work ( Turi and Taylor 1971 ) has shown that whole-rock δ SMOW 18 O remains constant at ~8‰ across this boundary ( Fig. 4f ), indicating no immediate effect of reaction with or assimilation of the metasedimentary wallrock (19.8‰). Whole-rock Zr concentrations...
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Concentration- and temperature-driven diffusions in an electroneutral elect...
in > Geophysics
Published: 31 May 2016
(thermal agitation). (b) During thermally driven diffusion (the Soret effect), the species diffuse from high to low temperature because of the increase of thermal agitation with temperature. In turn, high thermal agitation favors more collision between the species and therefore molecular diffusion. In both
Journal Article
Published: 01 June 2017
American Mineralogist (2017) 102 (6): 1263-1269.
... and spin state of iron in well-characterized Al-free Fe 3+ -rich bridgmanite were investigated by means of Mössbauer spectroscopy to understand the effect of ferric iron on the spin state. We found that a minor amount of Fe 3+ is in the low-spin state above 36 GPa and that its proportion does not increase...
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Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2007.2421(02)
... misinterpretations. The presence of Al and Fe affects the equation of state, the defect population, the ability of this phase to insert minor and trace elements, and the transport properties, etc. Some difficulties remain for the quantitative determination of these effects because of two main reasons: many...
Published: 01 December 2004
DOI: 10.5724/gcs.04.24.0464
EISBN: 978-0-9836096-6-7
... can also be driven by other forces, such as gradients in temperature (Soret diffusion) and charge (electrokinetic diffusion), and by differences in the chemical potential of water in the presence of a semipermeable membrane (osmosis). The net effects of dispersion are of critical importance to our...
Journal Article
Journal: Elements
Published: 01 October 2006
Elements (2006) 2 (5): 287-292.
... extended mush columns give rise to planetary-scale effects. A massive ∼12 km meteorite hit Earth 1.85 billion years ago. Within two minutes, it penetrated the entire continental crust and formed a transient cavity ∼30 km deep and ∼90 km in diameter. Within five minutes, the transient cavity relaxed...
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Journal Article
Published: 01 March 2019
American Mineralogist (2019) 104 (3): 403-417.
... an “oxychlorite” (i.e., H-deficient) ferric component, close to tri-trioctahedral, with an O 12 (OH) 6 anionic basis, even in green, pristine-looking chlorite. The effects of iron oxidation and H deficiency on chlorite geothermometers were explored. They are deterring if H deficiency is ignored but, given...
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Journal Article
Journal: Economic Geology
Published: 01 August 2014
Economic Geology (2014) 109 (5): 1257-1269.
... to a temperature gradient. Thus, while silicates form in a mush zone and remain immobile, the immiscible sulfide liquid position is controlled by the temperature of sulfide saturation and thus moves down relative to the silicates as new sills underplate previous ones; effectively, all PGE derived from the upper...
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Series: Economic Geology
Published: 01 January 2005
DOI: 10.5382/AV100.12
EISBN: 9781934969519
..., but metal leaching from consolidated granites is locally documented. Regional zoning may be well expressed in the W-Sn-Mo succession, and also in the outer halo of Cu-Pb, Zn-Ag, Sb and similar sulfide assemblages. These low-temperature associations are locally generated by the high-heat–producing effects...
Journal Article
Published: 01 August 2003
American Mineralogist (2003) 88 (8-9): 1181-1189.
... for the above reaction is finite ( Holloway et al. 1992 ). Nevertheless, these non-trivial amounts of CO 2 , if present, could have a measurable freezing point depression effect approaching the solidus, as proposed by Herzberg et al. (2000) . Instability and drift of thermocouples at high temperatures...
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Journal Article
Published: 01 October 2016
Geochemical Perspectives (2016) 5 (2): 191-198.
... – by definition. Thermal gradients were known to fractionate elements ( i.e. the Soret effect); and Mike and I were not convinced that the liquid composition at the Lehigh solid-liquid interface was the composition that simple equilibrium would have predicted. My experimental protocol had been to take my...
Journal Article
Published: 01 October 2000
Mineralogical Magazine (2000) 64 (5): 968-969.
... immiscibility and the Soret effect attracted his ire early on. What made this book especially fascinating is that a few of Bowen’s younger/junior contemporaries were the professors that influenced the early years of this reviewer. C.E. Tilley (Cambridge), a magmatist and a great supporter of Bowen, and H.H...
Journal Article
Published: 01 October 2016
Geochemical Perspectives (2016) 5 (2): 210-222.
... as a proxy for a second Sc. A reviewer has queried as to how a lack of a Soret effect indicates ideality. The reviewer’s question assumed that the only criterion for producing a Soret compositional gradient was to have a thermal gradient. But although a temperature gradient is necessary for the Soret...
Series: Geological Society, London, Special Publications
Published: 01 January 2004
DOI: 10.1144/GSL.SP.2004.237.01.08
EISBN: 9781862394858
... by diffusion, much like the Earth’s upper atmosphere (e.g. Hoier & Whitson 2000 ). Theoretical studies suggest that the thermal (Soret) effect can either enhance or weaken the gravitational effect ( Firoozabadi et al. 1996 ; Firoozabadi 1999 ), although some workers claim that the Soret effect...
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Journal Article
Published: 01 December 2005
Clays and Clay Minerals (2005) 53 (6): 564-571.
... ( Boffi et al. , 2001 ), affecting optical absorption. At pH<3.0, intramolecular electrostatic repulsion leads to unfolding and the exposure of hydrophobic portions of the molecule to solution (which may affect adsorption) and is reflected in a blue shift in the Soret band position (Figure 2a...
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