| Reference Type | Journal (article/letter/editorial) |
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| Title | CO2 fluid inclusions in ultramafic xenoliths from the Iblean Plateau, Sicily, Italy |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | De Vivo, B. | Author |
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| Lima, A. | Author |
| Scribano, V. | Author |
| Year | 1990 (June) | Volume | 54 |
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| Issue | 375 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_54/54-375-183.pdf+ |
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| DOI | doi:10.1180/minmag.1990.054.375.05Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 1607 | Long-form Identifier | mindat:1:5:1607:4 |
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| GUID | 0 |
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| Full Reference | De Vivo, B., Lima, A., Scribano, V. (1990) CO2 fluid inclusions in ultramafic xenoliths from the Iblean Plateau, Sicily, Italy. Mineralogical Magazine, 54 (375) 183-194 doi:10.1180/minmag.1990.054.375.05 |
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| Plain Text | De Vivo, B., Lima, A., Scribano, V. (1990) CO2 fluid inclusions in ultramafic xenoliths from the Iblean Plateau, Sicily, Italy. Mineralogical Magazine, 54 (375) 183-194 doi:10.1180/minmag.1990.054.375.05 |
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| In | (1990, June) Mineralogical Magazine Vol. 54 (375) Mineralogical Society |
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| Abstract/Notes | AbstractThe Iblean Plateau (Southeastern Sicily, Italy) consists of a thick Meso-Cenozoic carbonate sequence with interbedded volcanic horizons (alkaline and tholeiitic basalts). The alkaline basalts contain ultramafic (peridotites and pyroxenites) and mafic xenoliths. The peridotites are spinel-bearing lherzolites and lherzolitic harzburgites, with porphyroblastic to protogranular texture. Pyroxenites consist of Cr-diopside-bearing and Al-augite-bearing websterites. The mineral chemistry of the nodules indicates temperatures between 700 and 1050°C.Fluid inclusions containing CO2 and (sometimes) various proportions of silicate glass have been studied in olivine, orthopyroxene and clinopyroxene. The secondary inclusions occur as trails of CO2-rich inclusions, often cross-cutting deformation lamellae. The few primary inclusions, generally empty, show clear evidence of decrepitation. Of the 390 inclusions examined, 97% homogenized to the liquid phase (Th → L = −43.9 to +30.9°C); 3% homogenized to the vapour phase (Th → V = + 20.5 to +30.3°C, yelding CO2 densities in the range 0.20–1.13 g/cm3. Assuming a trapping temperature of 1100°C, the corresponding trapping pressure for a pure CO2 system lies in the range 0.6–11.0 kbar, i.e. a depth of ∼2.2 to 42 km.The majority of CO2 trapping events in the xenoliths occurred from 2.2 to 11.0 kbar, with no major trapping events at pressures less than 2.3 kbar, indicating the absence of a shallow magma reservoir below the Iblean Plateau. |
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