Browsing by Author "Oberti R."
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Browsing by Author "Oberti R."
Now showing items 1-14 of 14
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Quartieri S.; Dalconi M.C.; Boscherini F.; Oberti R.; D'Acapito F. (2004)The site location and local geometry of trace amounts (299 ppm) of dysprosium in a natural melanite garnet from a carbonatitic rock have been studied by high-energy fluorescence-detected X-ray absorption fine-structure ...
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Quartieri S.; Boscherini F.; Chaboy J.; Dalconi M.C.; Oberti R.; Zanetti A. (2002)Natural melanite garnets from carbonatitic rocks have been studied by a multitechnique approach based on both experimental (chemical, diffractometric and spectroscopic) methods and full-multiple scattering calculations of ...
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Oberti R.; Cámara F.; Ottolini L. (2005)Re-examination of holotype “clinoholmquistite”, ideally A□BLi2 C(Mg3Al2) TSi8 O22 X(OH)2 (Ginzburg 1965) from the Tastyg spodumene deposit, Tuva, Siberia, Russia by EMP and SIMS analysis and structure refinement shows that ...
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Bottazzi P.; Tiepolo M.; Vannucci R.; Zanetti A.; Brumm R.; Foley S.F.; Oberti R. (1999)New experimental amphibole/melt partition coefficients from a variety of geologically relevant amphibole (pargasite, kaersutite, and K-richterite) and melt compositions obtained under conditions of interest to upper-mantle ...
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Oberti R.; Cámara F.; Caballero J.M. (2004)Mineralogical and crystal-chemical descriptions are provided for two end-members of the new Group 5 introduced by Leake et al. (2004) in the nomenclature of amphiboles. This new classification scheme recognizes the occurrence ...
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Camara F.; Iezzi G.; Oberti R. (2003)Ferrian magnesian spodumene was synthesized in the MLFSH system at P=0.4 GPa, T=700 °C, fO2=NNO+2.3. The space group at room T is P21/c [a=9.638(3) A, b=8.709(2) A, c=5.258(2) A, β=109.83(3)°, V=415.2 A3]. The structure ...
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Zanetti A.; Vannucci R.; Bottazzi P.; Oberti R.; Ottolini L. (1996)Systematic investigations (electron- and ion-microprobe, and X-ray structure-refinement) of pyroxenes and amphiboles close to a cm-wide hornblendite vein have been carried out on a composite peridotite sample from the Lherz ...
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Oberti R.; Cámara F.; Ottolini L.; Caballero J.M. (2003)Lithium is an important constituent in amphiboles, where it can be incorporated up to a limit of three atoms per formula unit (apfu). Lithium can partition itself between the B-group sites (where it occurs at the [6+2] ...
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Tiepolo M.; Vannucci R.; Oberti R.; Bottazzi P.; Zanetti A.; Foley S. (2000)New partition coefficients between liquid and pargasitic/kaersutitic amphiboles (Amph/LDNb,Ta) experimentally determined for Nb and Ta at upper-mantle conditions, combined with single-crystal structure refinement of the ...
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Oberti R.; Cámara F.; Ottolini L.; Caballero J.M. (2003)A systematic examination of metamorphic episyenites in the Pedriza Massif, Sierra de Guadarrama, Spain, allowed detection of two more distinct Li-rich C2/m amphibole species. They can be related to previously described ...
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Iezzi G.; Cámara F.; Oberti R.; Della Ventura G.; Pedrazzi G.; Robert J.-L. (2004)This work reports the synthesis of ferri-clinoholmquistite, nominally □Li2(Mg3Fe3+2)Si8O22(OH)2, at varying f O 2 conditions. Amphibole compositions were characterized by X-ray (powder and single-crystal) diffraction, ...
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Cámara F.; Oberti R.; Iezzi G.; Della Ventura G. (2003)The P21/mC2/m displacive phase transition in the synthetic end-member amphibole Na NaMg Mg5 Si8 O22 (OH)2 has been studied by monitoring changes in unit-cell parameters and the intensities of superlattice reflections at ...
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Tiepolo M.; Oberti R.; Vannucci R. (2002)Titanite/liquid partition coefficients for most of the trace elements relevant in petrogenetic studies are provided for titanite-saturated liquids equilibrated at 1.5 GPa and 850 °C starting from lamproitic compositions. ...
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Zanetti A.; Tiepolo M.; Oberti R.; Vannucci R. (2004)Olivine/liquid partition coefficients for most trace elements relevant in petrogenetic studies are provided for a hydrous basanite melt equilibrated at 1.4 GPa and 1055 °C. The partitioning results determined by a combination ...
Now showing items 1-14 of 14