Publication Date:
2018-04-26
Description:
Petrological and geochemical data of Triassic magmatic rocks from Lercara Basin
(Central Sicily), provide new information about the intraplate volcanism related to the
Pangea break up. The magmatic rocks crop out as subvolcanic bodies and are packed
in several Lower Triassic clayey lithologies correlated to the sedimentation inside the
Imerese and Sicano domains. The samples are splitted in two groups: the first includes
transitional to alkaline basalts, with sub-ophitic texture; the second includes more altered
rocks, with porphyritic texture, showing alkali basaltic to phonolitic compositions.
Major and trace element data of single groups show small variations indicating fractional
crystallization processes. Abundances and ratios of incompatible trace elements indicate
that rocks were formed in an intraplate continental environment from different mantle
sources with E-MORB to OIB-type compositions. Low partial melting degrees at the
transition between spinel and garnet lherzolite fields can be hypothesized for parental
magmas of the Lercara Basin. We propose that magma batches moved toward the
surface along lithospheric fractures originated by flexure and uplift of the Mesozoic
Pangea supercontinent.
Description:
Published
Description:
169-181
Description:
2V. Struttura e sistema di alimentazione dei vulcani
Description:
JCR Journal
Keywords:
intraplate continental volcanism
;
spinel-garnet-lherzolite source
;
tectonic setting of triassic magmatism
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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