Spinels of Variscan olivine hornblendites related to the Montnegre granitoids revisited (NE Spain) : petrogenetic evidence of mafic magma mixing
| Autor: | GALÁN, G., ENRIQUE, P., BUTJOSA, L., FERNÁNDEZ-ROIG, M. |
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| Rok vydání: | 2017 |
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| Zdroj: | Dipòsit Digital de Documents de la UAB Universitat Autònoma de Barcelona Geologica Acta; Vol. 15 No. 4 (2017): Granites and Related Rocks. A tribute to Guillermo Corretgé; 323-336 RCUB. Revistas Científicas de la Universidad de Barcelona instname Geologica Acta; 2017: Vol.: 15 Núm.: 4. Special Issue: Granites and Related Rocks: a tribute to Guillermo Corretgé; p. 323-326 |
| ISSN: | 1696-5728 1695-6133 |
| Popis: | Olivine hornblendites (cortlandtites) form part of the Montnegre mafic complex related to late-Variscan I-type granitoids in the Catalan Coastal Ranges. Two generations of spinel are present in these hornblendites: Spl1 forms euhedral crystals included in both olivine and Spl2. Spl2 forms euhedral to anhedral crystals associated with phlogopite and fibrous colourless amphibole forming pseudomorphs after olivine. Compositions of Spl1 are picotite-Al chromite (Fe#: 77.78-66.60; Cr#: 30.12-52.22; Fe3+/R3+: 6.99-21.89; 0.10< TiO2%< 0.62). Compositions of Spl2 are pleonaste (Fe#: 37.86-52.12; Cr#: 1.00-15.45; Fe3+/R3+: 0.31-5.21; TiO2% |
| Databáze: | OpenAIRE |
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