Geology Reference
In-Depth Information
VU23
Melfi
VU VU10
MOUNT
VULTURE
VU30
EL 20
EL 21
VU13
EL 11,13
1326 mt
1262 mt
VU24
Rionero
VU23
EL 8
EL 17
0 km 2
Trpinian Units
L.tortonian-UlLanghian
Numidion Flysch
L.Miocene
Flysch Rosso
Oligocene-U Cretaceous
Bsn-Tph-Ph series
Pyroclastics
Lava flows, domes
++
++
+ +
Quaternary alluvium
limnopyroclastics
Altavillo Unit
Pliocene- Tortonian
Ariano Unit
Mid-lower Pliocene
Melilite-bearing rocks
Fig. 4.26 Sketch of Mt. Vulture complex (after Melluso et al. 1996)
volcano. The bulk of the edi
yne- and leucite-bearing
undersaturated rocks ranging in composition from Mg-rich basanites through
tephrites and foidites to phonolites.
Melilite-bearing volcanic rocks were also erupted during the activity of the
strato-volcano. The Scimia melilite dyke and Melfi
ce is made up of ha
ü
(Fig. 4.26 )ha
ü
ynophyre lava
flows occur outside the volcanic cone. Melilite laths are also found in the
S. Caterina melafoidite lava
flow (De Fino et al. 1982). The lavas of the Mt. Vulture
complex are characterized by the presence of phenocrysts of clinopyroxene,
ha
yne, leucite and opaque minerals. Alteration of leucite to analcite is common.
Basanites contain pale green to green clinopyroxene with smaller amounts of
olivine (containing inclusions of Cr- and Al-rich spinels) and ha
ü
ü
yne. Clinopy-
roxenes contain apatite inclusions set in a glassy groundmass. According to
Melluso et al. (1996), tephrites and phonolites are characterized by phenocrysts of
zoned pyroxenes (often green in colour having sectors or inverse zoning), plagio-
clase, magnetite, leucite (frequently analcitized) and ha
yne. Sometimes, amphi-
bole, biotite and olivine also occur. Anorthoclase is predominantly observed in the
groundmass as a microcrystalline phase together with apatite. Phonolites present
ü
 
 
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