http://www.cnr.it/ontology/cnr/individuo/prodotto/ID48778
Time-space distribution of magmatic activity in the western Mediterranean and peripheral orogens during the past 30 Ma ( a stimulus to geodynamic considerations) (Articolo in rivista)
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- Label
- Time-space distribution of magmatic activity in the western Mediterranean and peripheral orogens during the past 30 Ma ( a stimulus to geodynamic considerations) (Articolo in rivista) (literal)
- Anno
- 2002-01-01T00:00:00+01:00 (literal)
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- ISI Web of Science (WOS) (literal)
- Titolo
- Time-space distribution of magmatic activity in the western Mediterranean and peripheral orogens during the past 30 Ma ( a stimulus to geodynamic considerations) (literal)
- Abstract
- .- Age and rock type, regional distribution and structural setting of
volcanic and plutonic manifestations from the western Mediterranean basin
and peripheral orogens during the past 30 Ma are examined. Distinct
magmatic phases (ranging between 30 and 15, 15 and 9, 8 and 6, 5 and 2, 2
and 1.5, and finally between 1.5 and 0 Ma) exhibit a large variety of rock
types which reflect complex processes of backarc and arc extension related
with convergence between the European and the African-Ionian-Adriatic
plates. The overall length of a complex plate boundary zone increased with
time from ca. 1400 to 2500 km along-strike. Widespread, extension-related
orogenic products were emplaced subsequent to distinct convergent
processes which led to formation of the Hercynian, Alpine and Apenninic
orogens. Attenuation of the Alpine area was initiated with eruption of
plutonic and volcanic rocks of acidic calcalkaline composition and of
volcanics of tholeiitic (subalkaline) affinity. Tholeiites were probably
linked to faster rates of intra-orogenic extension reaching the stage of
oceanic opening in the south Tyrrhenian sea. In addition, localized small-
volume eruptions of ultrapotassic rocks (lamproites) accompanied thinning
and stretching of the Alpine orogenic wedge. Intraplate Na-alkaline
manifestations are widespread in the passive margins and in foreland
areas. Overall, the episodic progression of magmatic activity in the
western Mediterranean reflects complex geodynamic processes of retreating
subduction, spreading and crustal attenuation which were preceded in time
by continent-continent collision in the entire area.
(literal)
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