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See detailPrediction of plagioclase-melt equilibria in anhydrous silicate melts at 1 atm
Namur, Olivier ULg; Charlier, Bernard ULg; Toplis, Michael et al

in Contributions to Mineralogy & Petrology (2012), 163

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See detailIlmenite composition in the Tellnes Fe–Ti deposit, SW Norway: fractional crystallization, postcumulus evolution and ilmenite–zircon relation
Charlier, Bernard ULg; Skar, Oyvind; Korneliussen, Are et al

in Contributions to Mineralogy & Petrology (2007), 154(2), 119-134

Major and trace element XRF and in situ LA-ICP-MS analyses of ilmenite in the Tellnes ilmenite deposit, Rogaland Anorthosite Province, SW Norway, constrains a two stage fractional crystallization model of ... [more ▼]

Major and trace element XRF and in situ LA-ICP-MS analyses of ilmenite in the Tellnes ilmenite deposit, Rogaland Anorthosite Province, SW Norway, constrains a two stage fractional crystallization model of a ferrodioritic Fe-Ti-P rich melt. Stage 1 is characterized by ilmenite-plagioclase cumulates, partly stored in the lower part of the ore body (Lower Central Zone, LCZ), and stage 2 by ilmenite-plagioclase-orthopyroxene-olivine cumulates (Upper Central Zone, UCZ). The concentration of V and Cr in ilmenite, corrected for the trapped liquid effect, (1) defines the cotectic proportion of ilmenite to be 17.5 wt% during stage 1, and (2) implies an increase of D VIlm during stage 2, most likely related to a shift in fO2. The proportion of 17.5 wt% is lower than the modal proportion of ilmenite (ca. 50 wt%) in the ore body, implying accumulation of ilmenite and flotation of plagioclase. The fraction of residual liquid left after crystallization of Tellnes cumulates is estimated at 0.6 and the flotation of plagioclase at 26 wt% of the initial melt mass. The increasing content of intercumulus magnetite with stratigraphic height, from 0 to ca. 3 wt%, results from differentiation of the trapped liquid towards magnetite saturation. The MgO content of ilmenite (1.4–4.4 wt%) is much lower than the expected cumulus composition. It shows extensive postcumulus re-equilibration with trapped liquid and ferromagnesian silicates, correlated with distance to the host anorthosite. The Zr content of ilmenite, provided by in situ analyses, is low (<114 ppm) and uncorrelated with stratigraphy or Cr content. The data demonstrate that zircon coronas observed around ilmenite formed by subsolidus exsolution of ZrO2 from ilmenite. The U-Pb zircon age of 920 ± 3 Ma probably records this exsolution process. [less ▲]

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See detailThe stability of primary alluaudites in granitic pegmatites: an experimental investigation of the Na-2(Mn2-2x Fe1+2x )(PO4)(3) system
Hatert, Frédéric ULg; Fransolet, André-Mathieu ULg; Maresch, Walter W.

in Contributions to Mineralogy & Petrology (2006), 152(4), 399-419

In order to assess the geothermometric potential of the Na-2(Mn2-2x Fe1+2x )(PO4)(3) system (x = 0-1), which represents the compositions of natural weakly oxidized alluaudites, we performed hydrothermal ... [more ▼]

In order to assess the geothermometric potential of the Na-2(Mn2-2x Fe1+2x )(PO4)(3) system (x = 0-1), which represents the compositions of natural weakly oxidized alluaudites, we performed hydrothermal experiments between 400 and 800 degrees C, at 1 kbar, under an oxygen fugacity (f(O-2)) controlled by the Ni-NiO (NNO), Fe2O3-Fe3O4 (HM), Cu2O-CuO (CT), and Fe-Fe3O4 (MI) buffers. When f(O-2) is controlled by NNO, single-phase alluaudites crystallize at 400 and 500 degrees C, whereas the association alluaudite + maricite appears between 500 and 700 degrees C. The limit between these two fields corresponds to the maximum temperature that can be reached by alluaudites in granitic pegmatites, because maricite has never been observed in these geological environments. Because alluaudites are very sensitive to variations of oxygen fugacity, the field of hagendorfite, Na2MnFe2+Fe3+(PO4)(3), has been positioned in the f(O-2)-T diagram, and provides a tool that can be used to estimate the oxygen fugacity conditions that prevailed in granitic pegmatites during the crystallization of this phosphate. [less ▲]

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See detailFluid inclusions in charnockites from the Bjerkreim-Sokndal massif (Rogaland, southwestern Norway): fluid origin and in situ evolution
Wilmart, Edith; Clocchiatti, Robert; Duchesne, Jean-Clair ULg et al

in Contributions to Mineralogy & Petrology (1991), 108

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See detailPetrogenesis of monzonoritic dykes in the Egersund-Ogna anorthosite (Rogaland, SW Norway)
Duchesne, Jean-Clair ULg; Demaiffe, Daniel; Roelandts, Iwan et al

in Contributions to Mineralogy & Petrology (1985), 90

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See detailQuantitative modeling of Sr, Ca, Rb, K in the Bjerkreim-Sokndal lopolith (S.W. Norway)
Duchesne, Jean-Clair ULg

in Contributions to Mineralogy & Petrology (1978), 66

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