Cruciani, G., Franceschelli, M., Massonne, H.-J. (2011) Low-temperature metamorphic evolution of a pre-Variscan gabbro: a case study from the Palaeozoic basement of northwest Sardinia, Italy. Mineralogical Magazine, 75 (6) 2793-2812 doi:10.1180/minmag.2011.075.6.2793
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Low-temperature metamorphic evolution of a pre-Variscan gabbro: a case study from the Palaeozoic basement of northwest Sardinia, Italy | ||
| Journal | Mineralogical Magazine | ||
| Authors | Cruciani, G. | Author | |
| Franceschelli, M. | Author | ||
| Massonne, H.-J. | Author | ||
| Year | 2011 (December) | Volume | 75 |
| Issue | 6 | ||
| Publisher | Mineralogical Society | ||
| DOI | doi:10.1180/minmag.2011.075.6.2793Search in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 244191 | Long-form Identifier | mindat:1:5:244191:1 |
| GUID | 0 | ||
| Full Reference | Cruciani, G., Franceschelli, M., Massonne, H.-J. (2011) Low-temperature metamorphic evolution of a pre-Variscan gabbro: a case study from the Palaeozoic basement of northwest Sardinia, Italy. Mineralogical Magazine, 75 (6) 2793-2812 doi:10.1180/minmag.2011.075.6.2793 | ||
| Plain Text | Cruciani, G., Franceschelli, M., Massonne, H.-J. (2011) Low-temperature metamorphic evolution of a pre-Variscan gabbro: a case study from the Palaeozoic basement of northwest Sardinia, Italy. Mineralogical Magazine, 75 (6) 2793-2812 doi:10.1180/minmag.2011.075.6.2793 | ||
| Abstract/Notes | AbstractA lenticular metagabbro crops out in an early Palaeozoic metasedimentary sequence at Nurra, northwest Sardinia. The metagabbro consists of variable proportions of early-formed coarse-grained albite, chlorite, epidote and apatite, later biotite and amphibole, and late stilpnomelane. Clinopyroxene and ilmenite are rare relict igneous minerals; albite has completely replaced primary plagioclase.The metamorphic evolution of the Nurra metagabbro has been investigated by pseudosection modelling for a fixed bulk-rock composition in the Na2O—CaO—K2O—FeO—MgO—A12O3—SiO2—H2O (NCKFMASH) model system with added Ti and Mn in the P-T range 1-11 kbar and 150-450°C. The P—T path of the metagabbro is a loop with a prograde segment overprinted by later metamorphic re-equilibration. The pressure peak was at ⩽7 kbar and ∼400°C. The subsequent temperature peak, at ∼440°C, was accompanied by a decrease in pressure to ∼3 kbar. The final P—T evolution of the metagabbro is characterized by near-isobaric cooling to 250—300°C, with the formation of stilpnomelane. The P—T path of the Nurra gabbro is typical of continental orogenic belts that have undergone crustal thickening. | ||
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