| Reference Type | Journal (article/letter/editorial) |
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| Title | On the pressure dependence of solidus temperatures and electrical conductivity during melting of JOIDES Leg 37 samples |
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| Journal | Canadian Journal of Earth Sciences |
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| Authors | Schloessin, H. H. | Author |
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| Year | 1977 (April 1) | Volume | 14 |
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| Issue | 4 |
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| Publisher | Canadian Science Publishing |
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| DOI | doi:10.1139/e77-073Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 475321 | Long-form Identifier | mindat:1:5:475321:0 |
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| GUID | 0 |
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| Full Reference | Schloessin, H. H. (1977) On the pressure dependence of solidus temperatures and electrical conductivity during melting of JOIDES Leg 37 samples. Canadian Journal of Earth Sciences, 14 (4) 756-767 doi:10.1139/e77-073 |
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| Plain Text | Schloessin, H. H. (1977) On the pressure dependence of solidus temperatures and electrical conductivity during melting of JOIDES Leg 37 samples. Canadian Journal of Earth Sciences, 14 (4) 756-767 doi:10.1139/e77-073 |
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| In | (1977, April) Canadian Journal of Earth Sciences Vol. 14 (4) Canadian Science Publishing |
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| Abstract/Notes | Premonitory decreases (to ~10−4 S cm−1) in the electrical conductivity of oceanic basalts found at the onset of partial melting signify breaks in solid phase coherence by the formation of isolated melt pockets, latent heat effects, and gradual interchanges in the dominant conduction mechanisms from extrinsic electronic in the solid to ionic in the melt phase. The conductivity rises sharply (to ~90 × 10−1 S cm−1) on formation of a contiguous melt phase. The corresponding formation temperature, which measures also the permeability of a heterogeneous, polycrystalline aggregate by the melt phase forming first appears to be as significant as the solidus temperature in a homogeneous system. Temperatures correlated with incipient melting lie on or parallel to (~150 °C below) the slope of the established solidus for gabbro–eclogite or peridotite materials; early crystallization points cluster along the garnet line. The pressure coefficient, (ΔT/ΔP) value, for the formation temperature of a contiguous melt phase in all of the samples comes closest to the slope of the melting curve for diopside. However, taking into account sample origin, the corresponding (ΔT/ΔP) values are found to vary between 8.7 and 24.5 °C kbar−1 (87 and 245 °C GPa−1). There are some indications of effects on solidus temperatures and conductivity values which are related to variations in chemical composition, especially Si, Al, and Fe concentrations. The conductivity decreases with increasing si-excess, increasing Al-component, and decreasing Fe-fraction of the femic component. |
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