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Tephrite

Augite (Ca,Mg,Fe,Al)2(Si,Al)206 Basalts, andesites, tephrites, limburgites gabbros, dolerites, ultramafic rocks. Sometimes in granites... [Pg.270]

Roman Province (Latium) (0.8 to 0.02 Ma) Vulsini (0.6-0.15), Vico (0.4-0.1), Sabatini (0.8-0.04), Colli Albani (0.6-0.02) - Large volcanic complexes formed of potassic (trachybasalt to trachyte) and ultrapotassic (leucite tephrite, to phonolite) pyroclastics and minor lavas. [Pg.3]

Campania and Pontine Islands (1 Mato Present) Somma-Vesuvio (0.03-1944 AD), Campi Flegrei (0.3-1538 AD), I-schia (0.15-1302 AD), Procida (0.05-0.01), Ventotene (0.8-0.1), younger Ponza (1). - Shoshonitic, potassic (trachybasalt to trachyte) and ultrapotassic (leucite tephrite to phonolite) rocks forming stratovolcanoes and multi-centre complexes. [Pg.3]

Vulture (0.8 to 0.1 Ma) Vulture, Melfi - Stratovolcano and a few parasitic centres formed by Na-K-rich tephrites, phonolites, foidites with haiiyne. Possible carbonatite. [Pg.3]

Latium leudte tephrite Iblei thgleiilic basalt... [Pg.7]

Vulsini 0.6 to 0.15 - Several multicentre volcanic complexes with calderas, developed around the volcano-tectonic depression of the Bolsena Lake. Dominant pyroclastic fall deposits and ig-nimbrites and minor lavas, showing KS (trachybasalt to trachyte) and HKS (leucitite and leucite tephrite to pho-nolite) compositions. Minor melilitite. [Pg.72]

Vico 0.42 to 0.1 - Stratovolcano with a central caldera, an intra caldera cone and a few small circum-caldera centres. Dominant pyroclastic fall deposits and ignimbrites and minor lavas, mostly showing HKS (leucite tephrite to phonolite) composition. Minor trachybasalt, latite, trachyte and rhyolite. [Pg.72]

Colli Albani (Alban Hills) 0.6 to 0.02 possible historical activity - Stratovolcano with central nested calderas and several post-caldera explosion craters and maars, consisting of HKS (leucitite, leucite tephrite and phonotephrite) pyroclastic fall, flow and hydromagmatic products, and minor lavas. [Pg.72]

Fig. 4.5. Photomicrograph of a leucite tephrite from Vulsini showing color zoning (from deep green salite to colourless diopside) for clinopyroxene phenocrysts. Plane polarised light. Fig. 4.5. Photomicrograph of a leucite tephrite from Vulsini showing color zoning (from deep green salite to colourless diopside) for clinopyroxene phenocrysts. Plane polarised light.
Major element studies (Cundari 1979 Conticelli et al. 1997 and references therein) have shown that the Sabatini volcanics consist almost entirely of undersaturated ultrapotassic rocks, ranging from tephrite to phonolite (Figs. 4.2, 4.15), with dominant phonotephrites. A few trachytes and latites have been erupted locally (Morlupo and Vigna di Valle lava flows). [Pg.88]

The latites and trachytes were probably derived from a different type of parent magma than the other Sabatini rocks. This magma was envisaged to have had lower enrichment in potassium than the parent of the tephrite-phonolite suites. However, no evidence for this mafic magma has been found at Sabatini. [Pg.90]

The Colli Albani rocks have a silica underaturated ultrapotassic composition, and range from tephrite to foidite (leucitite) and tephriphonolite (Fig. [Pg.93]

Rock type Leucite tephrite Trachy- basalt Trachy- phonolite Trachyte Melilitite Trachy- basalt Latite Phono- lite... [Pg.106]

Rock type Phonotephrite Rhyolite Phono- tephrite Tephri- phonolite Phonolite Leucite- tephrite Phono- tefrite Leucitite... [Pg.107]

Monti Ernici about 0.7 to 0.1 - HKS 0.7 to 0.2 -KS 0.2 to 0.1 - About twenty monogenetic cones formed of strombolian scoriae, hydrovolcanic surge and flow deposits and some lava flows displaying a mafic composition and a subalkaline (LKB) to alkaline potassic (KS) and ultrapotassic (HKS) petrochemical affinity (basalt, K-trachybasalt, tephrite, phonotephrite, leucit-ite). [Pg.111]

Rock type Low-K basalt K-trachy- basalt Leucite-tephrite Leucitite... [Pg.127]

Volcano Somma-Vesuvio Age 30 ka to 1944 AD Volcanology and Petrology - Stratovolcano (Mount Somma) with multiple caldera and an intracaldera cone (Vesu-vio) formed of slightly to strongly silica undersaturated trachybasalt and leucite-tephrite to trachyte and phonolite. [Pg.132]

Vulture 0.8 to 0.13 Ma - Stratovolcano with a summit caldera, intracaldera explosion craters and some parasitic centres formed of lavas and pyroclastics with Na-K-alkaline tephrite, foidite, melilitite, hatiynophyre, and phonolite compositions. Late carbonate-rich pyroclasts. [Pg.132]

Rock type Leucitite Tephrite Tephri- phonolite Phonolite Trachyte Shosho- nite Latite Trachy- phonolite... [Pg.169]

A strongly silica undersaturated Na-alkaline series ranging in composition from basanite-tephrite to phonolite, with some of the most evolved rocks reaching a peralkaline composition. This is best represented by volcanic rocks from Montiferro. [Pg.264]

Vai GB, Martini PI (eds) (2001) Anatomy of an Orogen. The Apennines and adjacent Mediterranean basins. Kluwer, Dordrecht, 632 pp Varekamp JC, Kalamarides R (1989) Hybridization processes in leucite tephrites from Vulsini, Italy, and the evolution of the Italian potassic suite. J Geophys Res 94 4603-4618... [Pg.358]

See other pages where Tephrite is mentioned: [Pg.134]    [Pg.411]    [Pg.13]    [Pg.70]    [Pg.73]    [Pg.74]    [Pg.75]    [Pg.88]    [Pg.96]    [Pg.98]    [Pg.105]    [Pg.112]    [Pg.113]    [Pg.120]    [Pg.121]    [Pg.126]    [Pg.133]    [Pg.136]    [Pg.136]    [Pg.152]    [Pg.158]    [Pg.158]    [Pg.269]    [Pg.295]    [Pg.298]    [Pg.319]   
See also in sourсe #XX -- [ Pg.88 , Pg.93 , Pg.136 , Pg.158 , Pg.264 ]



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Leucite tephrite

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