Trace element partitioning during the initial stages of melting beneath mid-ocean ridges

Salters, Vincent J. M.; Longhi, J.

doi:10.1016/s0012-821x(98)00271-4

Cited by 293 publications

(211 citation statements)

References 44 publications

Supporting

Mentioning

194

Contrasting

Unclassified

Order By: Relevance

“…In Fig. 3a, data from two experiments performed under nominally anhydrous conditions at~3 GPa on basaltic (Salters and Longhi 1999) and eclogitic (Pertermann et al 2004) starting materials are well matched by the new model curves, with significant improvement over the WvW01 model. Note that both of these experiments lack data for Sc, and hence were not included in the statistical database.…”

Section: Comparison Between Model and Measurementsmentioning

confidence: 69%

“…Possible correlations between these variables were first assessed to find combinations in which all variables were independent of one another. Then, each individual lattice-strain fit parameter (D 0 r 0 , and E) was (2000) 1-3 GPa, 900-1,150°C, hydrous, andesitic to tonalitic melts Klemme et al (2002) 3 GPa, 1,400°C, anhydrous Nicholls and Harris (1980) 2-3 GPa, 940-1,420°C, dacitic melts, hydrous Salters and Longhi (1999) 2.8 GPa, 1,500-1,550°C, anhydrous Salters et al (2002) 2.8-3.4 GPa, 1,465-1,660°C, anhydrous Shimizu and Kushiro (1975) 3 GPa, 1,275°C, anhydrous Walter et al (2004)~23 GPa,~2,300°C, anhydrous, majoritic garnet multiply regressed against combinations of these independent variables using both standard and ''stepwise'' approaches. Multiple linear regression results for these permutations show which are robust predictors and which are not.…”

Section: Expanded Databasementioning

confidence: 99%

“…Significant mismatches remain, particularly for high-ionic radius elements like the light rare earths, which are expected to have the smallest D values. Such elements are notoriously difficult to work with Pertermann et al (2004) and run TM694-3 of Salters and Longhi (1999). Neither run included Sc data, so both were excluded from statistical database.…”

Section: Compo-mentioning

confidence: 99%

See 2 more Smart Citations

Quantifying garnet-melt trace element partitioning using lattice-strain theory: assessment of statistically significant controls and a new predictive model

Draper

Westrenen

2007

Contrib Mineral Petrol

View full text Add to dashboard Cite

As a complement to our efforts to update and revise the thermodynamic basis for predicting garnet-melt trace element partitioning using lattice-strain theory (van Westrenen and Draper in Contrib Mineral Petrol, this issue), we have performed detailed statistical evaluations of possible correlations between intensive and extensive variables and experimentally determined garnet-melt partitioning values for trivalent cations (rare earth elements, Y, and Sc) entering the dodecahedral garnet X-site. We applied these evaluations to a database containing over 300 partition coefficient determinations, compiled both from literature values and from our own work designed in part to expand that database. Available data include partitioning measurements in ultramafic to basaltic to intermediate bulk compositions, and recent studies in Fe-rich systems relevant to extraterrestrial petrogenesis, at pressures sufficiently high such that a significant component of majorite, the high-pressure form of garnet, is present. Through the application of lattice-strain theory, we obtained best-fit values for the ideal ionic radius of the dodecahedral garnet X-site, r 0 (3+), its apparent Young's modulus E(3+), and the strain-free partition coefficient D 0 (3+) for a fictive REE element J of ionic radius r 0 (3+). Resulting values of E, D 0 , and r 0 were used in multiple linear regressions involving sixteen variables that reflect the possible influence of garnet composition and stoichiometry, melt composition and structure, major-element partitioning, pressure, and temperature. We find no statistically significant correlations between fitted r 0 and E values and any combination of variables. However, a highly robust correlation between fitted D 0 and garnet-melt Fe-Mg exchange and D Mg is identified. The identification of more explicit melt-compositional influence is a first for this type of predictive modeling. We combine this statistically-derived expression for predicting D 0 with the new expressions for predicting E and r 0 outlined in the first of our pair of companion papers into an updated set of formulae that use easy-to-measure quantities (e.g. garnet composition, pressure, temperature) to predict variations in E, r 0 , and D 0 . These values are used in turn to calculate D values for those garnets. The updated model substantially improves upon a previous model (van Westrenen et al. in Contrib Mineral Petrol 142:219-234, 2001), and accounts well for trivalent cation partitioning in nominally anhydrous systems up to at least 15 GPa, including for eclogitic bulk compositions and for Fe-rich systems appropriate to magmagenesis on the Moon and Mars. The new model is slightly less successful in predicting partitioning with strongly majoritic garnets, although the mismatch is much less than with the original 2001 model. Although it also improves upon the 2001 model in predicting partitioning in hydrous systems, the mismatch between model and observation is still unacceptably large. The same statistical tools were applied in a...

show abstract

Section: Comparison Between Model and Measurementsmentioning

confidence: 69%

Section: Expanded Databasementioning

confidence: 99%

Section: Compo-mentioning

confidence: 99%

See 1 more Smart Citation

Quantifying garnet-melt trace element partitioning using lattice-strain theory: assessment of statistically significant controls and a new predictive model

Draper

Westrenen

2007

Contrib Mineral Petrol

View full text Add to dashboard Cite

show abstract

“…There was also a trend found in increasing of D values for all REE while changing of the chemical composition of melts from high-Mg ultramafic to basaltic and high-Si, and this tendency is more significant for D values for HREE. The function of values of D on the temperature and pressure of crystallization of the mineral was studied in the experiments in garnet-ultramafic melt system [35,36]. In particular, it was shown that with decreasing pressure in the range of 20-5.5 GPp the values of D (garnet / ultramafic melt) vary in the following ranges: La (0.03-0.08); Sm (0.04-0.20); Gd (0.03-0.39); Yb (0.32-2.36).…”

Section: Gabbrosmentioning

confidence: 99%

“…• C and P = 2 kbar, determined that the value of D (zircon / melt) vary within the following ranges: La (1.4-2.1); Sm (26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40); (Ho > 340); Lu (Fig. 5-7).…”

Section: Zirconsmentioning

confidence: 99%

Consistent patterns of rare earth element distribution in accessory minerals from rocks of mafic-ultramafic complexes

Lesnov

2013

Open Geosciences

View full text Add to dashboard Cite

This paper summarizes analytical data accumulated in the world literature and other materials about the regularities of the REE distribution in minerals contained in ultramafic and mafic rocks as accessory phases. These minerals are tentatively divided into two groups. The first includes garnets, zircons, apatites and perovskites, which can accumulate increased amounts of REE in their structure. The second consists of minerals whose structure can accumulate only limited contents of these trace elements. These are chrome-spinels, ilmenites, and micas. These minerals, in respect of REE geochemistry, are studied to a varying degree because of the different levels of accumulations of these elements, different degrees of occurrence in rocks, tiny sizes of their grains and other reasons. The analytical database formed on their basis includes about 600 original analyses. The overwhelming majority of presently available data on REE geochemistry in accessory minerals from ultramafic and mafic rocks have been published only in the recent 15 years. The studies became possible due to the development and introduction of new highly sensible microprobe analyses allowing detection of REE and many other trace elements in minerals grains directly in thin sections. The greatest numbers of these analyses were performed for garnets and zircons, fewer for apatites, and the fewest for chrome-spinels, ilmenites, micas, and perovskites. In general, the regularities of REE distribution in these minerals from ultramafic and mafic rocks are less studied compared to the rock-forming minerals from ultramafic and mafic rocks. Among the analytical methods, which were used to study the REE composition of accessory minerals, the most efficient was the mass-spectrometry with inductively coupled plasma (ICP-MS).Keywords: REE distribution • ultramafic and mafic rocks • accessory minerals © Versita Sp. z o.o.

show abstract

Isotope and trace element insights into heterogeneity of subridge mantle

Mallick

Dick

Sachi-Kocher

et al. 2014

Geochem Geophys Geosyst

View full text Add to dashboard Cite

Geochemical data for abyssal peridotites are used to determine the relationship to mid-ocean ridge basalts from several locations at ridge segments on the SW Indian Ridge (SWIR), the Mid-Cayman-Rise (MCR), and the Mid-Atlantic Ridge (MAR). Based on chemical and petrological criteria peridotites are categorized as being either dominantly impregnated with melt or being residual after recent melting. Those that are considered impregnated with melt also have isotopic compositions similar to the basalts indicating impregnation by an aggregate MORB melt. A SWIR and MCR residual peridotite Nd-isotopic compositions partly overlap the Nd-isotopic compositions of the basalts but extend to more radiogenic compositions. The differences between peridotite and basalt Nd-isotopic compositions can be explained by incorporating a low-solidus component with enriched isotopic signature in the subridge mantle: a component that is preferentially sampled by the basalts. At the MAR, peridotites and associated basalts have overlapping Ndisotopic compositions, suggesting a more homogeneous MORB mantle. The combined chemistry and petrography indicates a complex history with several depletion and enrichment events. The MCR data indicate that a low-solidus component can be a ubiquitous component of the asthenosphere. Residual abyssal peridotites from limited geographic areas also show significant chemical variations that could be associated with initial mantle heterogeneities related to events predating the ridge-melting event. Sm-Nd model ages for possible earlier depletion events suggest these could be as old as 2.4 Ga.

show abstract

Trace element partitioning during the initial stages of melting beneath mid-ocean ridges

Cited by 293 publications

References 44 publications

Quantifying garnet-melt trace element partitioning using lattice-strain theory: assessment of statistically significant controls and a new predictive model

Quantifying garnet-melt trace element partitioning using lattice-strain theory: assessment of statistically significant controls and a new predictive model

Consistent patterns of rare earth element distribution in accessory minerals from rocks of mafic-ultramafic complexes

Isotope and trace element insights into heterogeneity of subridge mantle

Contact Info

Product

Resources

About