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• W381075911 startingPage "69" @default.
• W381075911 abstract "Partition coefficients for Hf and Zr (DHf, DZr) have been determined experimentally between HFSE-bearing mafic minerals such as amphibole, clinopyroxene and garnet and basanitic andandesitic melts doped with Hf and, in some cases Zr as well, in a range of pressure from 0.5 to 3.0 GPa, and 1000-1050°C (basanite) or 900-950°C (andesite). DHf and DZr for amphibole/melt decrease with increasing P, and this pressure effect on D's is most noteworthy between 0.5 and 1.5 GPa. The DHf and DZr correlate positively with the relevant DTi. Also amphibole/melt pairs show DHf>DZr consistently through the pressure range 0.5-2.5 GPa. Thus Zr and Hf are decoupled to some extent by amphibole crystallization. A similar partitioning behaviour of Hf and also possible Zr/Hf fractionation occurs for clinopyroxene/melt pairs. In contrast, garnet/melt pairs indicate DZr>DHf. This implies that a distinctive Hf/Zr fractionation would occur with garnet involvement, compared with clinopyroxene (or amphibole). Also a modest change in Hf/Zr ratios is supposable in magmas, especially during initial stages of the partial melting process in which clinopyroxene is postulated as a residual phase and/or if amphibole fractionation occurs during shallower-level differentiation. However, results of our partial melting and fractionation modeling indicate that the change is only minor to negligible through such mineral(s)/melt separation processes involving clinopyroxene and amphibole. Co-existence of garnet with clinopyroxene in the residue further restrains the change of Hf/Zr ratios in partial melts, because the two minerals tend to fractionate Hf and Zr in opposite directions." @default.
• W381075911 created "2016-06-24" @default.
• W381075911 creator A5013990053 @default.
• W381075911 creator A5079492001 @default.
• W381075911 date "1997-01-01" @default.
• W381075911 modified "2023-10-17" @default.
• W381075911 title "Experimental study of partitioning of Hf and Zr between amphibole, clinopyroxene, garnet, and silicate melts." @default.
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• W381075911 doi "https://doi.org/10.2465/ganko.92.69" @default.
• W381075911 hasPublicationYear "1997" @default.
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