Mineral/matrix partition coefficients for orthopyroxene, plagioclase, and olivine in basaltic to andesitic systems: A combined analytical and experimental study

Dunn, Todd; Şen, Cüneyt

doi:10.1016/0016-7037(94)90501-0

Cited by 269 publications

(96 citation statements)

References 52 publications

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“…on the M1 site that is energetically favoured over both coupled substitution involving Al-Si exchange on the was present (e.g. Dunn and Sen 1994;Adam and Green 2006;McDade et al 2003;Frei et al 2009) generally show higher D values for R 3? cations compared to studies in which Li…”

Section: Discussionmentioning

confidence: 99%

“…The secondary ion accelerating voltage was 4,500 V with an offset of 75 V and energy window of ±20 eV to reduce molecular ion transmission. The following isotopes were measured and ratioed to 30 (Colson et al 1988;Kennedy 1993;Dunn and Sen 1994;Schwandt and McKay 1998;McDade et al 2003;Klemme et al 2006;Frei et al 2009) Dick and Overhauser (1958) is used to take account of oxygen ion polarisation.…”

Section: Experimental and Analytical Techniquesmentioning

confidence: 99%

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Experimental and computational study of trace element distribution between orthopyroxene and anhydrous silicate melt: substitution mechanisms and the effect of iron

Parker¹,

Liebscher

Frei

et al. 2009

Contrib Mineral Petrol

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Although orthopyroxene (Opx) is present during a wide range of magmatic differentiation processes in the terrestrial and lunar mantle, its effect on melt trace element contents is not well quantified. We present results of a combined experimental and computational study of trace element partitioning between Opx and anhydrous silicate melts. Experiments were performed in air at atmospheric pressure and temperatures ranging from 1,326 to 1,420°C in the system CaO-MgO-Al 2 O 3 -SiO 2 and subsystem CaOMgO-SiO 2 . We provide experimental partition coefficients for a wide range of trace elements (large ion lithophile: Li, Be, B, K, Rb, Sr, Cs, Ba, Th, U; rare earth elements, REE: La, $ 0:058, and are all virtually independent of temperature. Cr and Co are the only compatible trace elements at the studied conditions. To elucidate charge-balancing mechanisms for incorporation of REE into Opx and to assess the possible influence of Fe on Opx-melt partitioning, we compare our experimental results with computer simulations. In these simulations, we examine major and minor trace element incorporation into the end-members enstatite (Mg 2 Si 2 O 6 ) and ferrosilite (Fe 2 Si 2 O 6 ). Calculated solution energies show that R 2? cations are more soluble in Opx than R 3? cations of similar size, consistent with experimental partitioning data. In addition, simulations show charge balancing of R 3? cations by coupled substitution with Li ? on the M1 site that is energetically favoured over coupled substitution involving Al-Si exchange on the tetrahedrally coordinated site. We derived best-fit values for ideal ionic radii r 0 , maximum partition coefficients D 0 , and apparent Young's moduli E for substitutions onto the Opx M1 and M2 sites. Experimental r 0 values for R 3? substitutions are 0.66-0.67 Å for M1 and 0.82-0.87 Å for M2. Simulations for enstatite result in r 0 = 0.71-0.73 Å for M1 and *0.79-0.87 Å for M2. Ferrosilite r 0 values are systematically larger by *0.05 Å for both M1 and M2. The latter is opposite to experimental literature data, which appear to show a slight decrease in r M2 0 in the presence of Fe. Additional systematic studies in Febearing systems are required to resolve this inconsistency and to develop predictive Opx-melt partitioning models for use in terrestrial and lunar magmatic differentiation models.

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Section: Discussionmentioning

confidence: 99%

Section: Experimental and Analytical Techniquesmentioning

confidence: 99%

Experimental and computational study of trace element distribution between orthopyroxene and anhydrous silicate melt: substitution mechanisms and the effect of iron

Parker¹,

Liebscher

Frei

et al. 2009

Contrib Mineral Petrol

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“…12, 13), amphibole has very low Sr contents (14 ppm measured for Sample 148-504B-239R-1, 45-51 cm; Table 1), so Sr contents and isotopic compositions of the rocks are probably dominantly controlled by the formation of secondary calcic and sodic plagioclase, both of which can contain significantly more Sr (Blundy and Wood, 1991;Berndt et al, 1988). Moreover, igneous clinopyroxene contains less Sr than magmatic plagioclase to begin with (e.g., Kuehner et al, 1989;Dunn and Sen, 1994), so replacement of pyroxene by amphibole would have much smaller influence on the Sr contents and isotopic compositions of the rocks than reactions involving plagioclase. Whole-rock Sr contents of the lower dikes exhibit a slight positive correlation with Na 2 O (Fig 14), consistent with the presence of variable amounts of plagioclase in the rocks influencing whole-rock Sr contents.…”

Section: Sr Isotopic Compositions and Sr Concentrationsmentioning

confidence: 99%

Stable and Strontium Isotopic Profiles through Hydrothermally Altered Upper Oceanic Crust, Hole 504B

Alt¹,

Teagle²,

Bach³

et al. 1996

Proceedings of the Ocean Drilling Program, 148 Scientific Results

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Leg 148 penetrated 111m farther into Hole 504B, to a total depth of 2111 meters below seafloor (mbsf), and recovered diabase dikes similar to the immediately overlying rocks. Secondary mineralogy and whole-rock oxygen and strontium isotopic compositions were determined for samples from Leg 148. In addition, strontium isotopic analyses were performed on previously recovered samples of the lower dikes (1550-2000 mbsf). Trends observed in the lower dikes (1550-2000 mbsf) continue in the Leg 148 section (2000-2111 mbsf). These include the local presence of magnesiohornblende and secondary calcic plagioclase and high Ti contents of amphiboles. Cu, Zn, and S contents of the more altered rocks are low, and whole-rock δ 18 θ values of 33%350°C) and greater extents of recrystallization than in the upper dikes. All of the data for the new Leg 148 section are consistent with the rocks being a continuation of a subsurface reaction zone, where metals and sulfur are leached from the crust by hydrothermal fluids and transported to form metal sulfide mineralizations on or within the crust or vent into seawater.Sr contents of the lower sheeted dikes (1550-2111 mbsf) are generally 48-62 ppm, and whole-rock 87 Sr/ 86 Sr ratios range from 0.70265 to 0.70304, only slightly elevated relative to fresh MORB values. The rocks were altered by seawater-derived hydrothermal fluids, with little change in the Sr concentrations of the rocks. Although amphibole is the most abundant secondary phase, the Sr isotopic composition of the rocks is probably dominated by the abundance of secondary plagioclase. The 87 Sr/ 86 Sr ratios of hydrothermal fluids were higher than measured in variably recrystallized (10%-80%) whole rocks. The seawater component of hydrothermal fluids increased through time, as documented by 87 Sr/ 86 Sr ratios of 0.7028-0.7034 for amphibole and chlorite, to 0.7035-0.7038 for vein epidotes. The latter values record the composition of upwelling black smoker-type endmember hydrothermal fluids at Site 504.The low 87 Sr/ 86 Sr ratios for the lower dikes differ from the uniformly high ratios of the thoroughly recrystallized sheeted dikes from the Troodos ophiolite. The oceanic dikes interacted with much smaller volumes of seawater than the ophiolitic rocks and apparently to a lesser extent. These differences are in some way related to the contrasting tectonic setting, mineralogy, and chemical composition of ophiolites compared to in situ ocean crust.

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“…Partition coefficients are from the basalt-basaltic andesite compilation of Rollinson (1993) for Sr and Rb, and are from Hauri et al (1994) for Pb in clinopyroxene, Dunn and Sen (1994) for Pb in orthopyroxene and plagioclase and from Ewart and Griffin (1994) for Pb in magnetite. Tick marks represent 5 % intervals of AFC (5 % changes in "F"-the fraction of remaining liquid-from 1 to 0.5).…”

Section: Pb Isotope Variation Over Short Timescalesmentioning

confidence: 99%

Deciphering petrogenic processes using Pb isotope ratios from time-series samples at Bezymianny and Klyuchevskoy volcanoes, Central Kamchatka Depression

Kayzar

Nelson

Bachmann

et al. 2014

Contrib Mineral Petrol

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Mineral/matrix partition coefficients for orthopyroxene, plagioclase, and olivine in basaltic to andesitic systems: A combined analytical and experimental study

Cited by 269 publications

References 52 publications

Experimental and computational study of trace element distribution between orthopyroxene and anhydrous silicate melt: substitution mechanisms and the effect of iron

Experimental and computational study of trace element distribution between orthopyroxene and anhydrous silicate melt: substitution mechanisms and the effect of iron

Stable and Strontium Isotopic Profiles through Hydrothermally Altered Upper Oceanic Crust, Hole 504B

Deciphering petrogenic processes using Pb isotope ratios from time-series samples at Bezymianny and Klyuchevskoy volcanoes, Central Kamchatka Depression

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