Jones, A. P., Kostoula, T., Stoppa, F., Woolley, A. R. (2000) Petrography and mineral chemistry of mantle xenoliths in a carbonate-rich melilititic tuff from Mt. Vulture volcano, southern Italy. Mineralogical Magazine, 64 (4) 593-613 doi:10.1180/002646100549634
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Petrography and mineral chemistry of mantle xenoliths in a carbonate-rich melilititic tuff from Mt. Vulture volcano, southern Italy | ||
| Journal | Mineralogical Magazine | ||
| Authors | Jones, A. P. | Author | |
| Kostoula, T. | Author | ||
| Stoppa, F. | Author | ||
| Woolley, A. R. | Author | ||
| Year | 2000 (August) | Volume | 64 |
| Issue | 4 | ||
| Publisher | Mineralogical Society | ||
| DOI | doi:10.1180/002646100549634Search in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 243197 | Long-form Identifier | mindat:1:5:243197:4 |
| GUID | 0 | ||
| Full Reference | Jones, A. P., Kostoula, T., Stoppa, F., Woolley, A. R. (2000) Petrography and mineral chemistry of mantle xenoliths in a carbonate-rich melilititic tuff from Mt. Vulture volcano, southern Italy. Mineralogical Magazine, 64 (4) 593-613 doi:10.1180/002646100549634 | ||
| Plain Text | Jones, A. P., Kostoula, T., Stoppa, F., Woolley, A. R. (2000) Petrography and mineral chemistry of mantle xenoliths in a carbonate-rich melilititic tuff from Mt. Vulture volcano, southern Italy. Mineralogical Magazine, 64 (4) 593-613 doi:10.1180/002646100549634 | ||
| Abstract/Notes | AbstractWe present petrographic and mineralogical data for 21 mantle xenoliths (12 lherzolites, 8 wehrlites and 1 composite) selected from a suite of more than 70 samples collected from the Monticchio Formation, Mt. Vulture volcano, southern Italy. The xenoliths are rounded, coarse- to porphyroclastic-textured, and very fresh, with the following equilibrated mineral assemblages; olivine (Fo90–92), orthopyroxene (∼En89, Wo2.0), clinopyroxene (Mg90–92, 3–6% Al2O3, 1–1.5% Cr2O3), and chrome-spinel (14–20% MgO, ∼30–40% Cr2O3). Many xenoliths contain partial melt glasses and accessory sulphide (pentlandite) Some contain primary mica (phlogopite with ∼4% FeO, 1.8% Cr2O3, 1.4–2.8% TiO2) with slightly zoned rims (Fe-, Ti-, Al-enriched). One contains relics of garnet (pyrope; Mg84). Secondary veins in several xenoliths contain carbonate with significant Sr levels (∼0.5–1.0% SrO), occasional apatite and scarce melanite, all typical of carbonatites and presumably related to the host magma (melilitite/carbonatite). Although amphibole is a common megacryst in the same volcanic units, no primary amphibole was found in the xenoliths themselves. Calculated pressures and temperatures using a range of geothermometers/barometers give values of 14–22 kbar and 1050–1150°C. In particular, the En-Sp and Di-Sp thermo/barometers (Mercier, 1980) show a good positive correlation between P and T. The Monticchio xenoliths lie on the high-T side of an ‘oceanic’ geotherm. The xenolith geotherm is hotter than general heat flow values in this region at the current day (50 mWm−2) but it compares well with the high-pressure end of a typical alkaline continental rift. | ||
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