http://www.cnr.it/ontology/cnr/individuo/prodotto/ID181054

U-Pb SHRIMP zircon dating of andesite from the Dolomite area (NE Italy): geochronological evidence for the early onset of Permian Volcanism in the eastern part of the southern Alps (Articolo in rivista)

Type

Articolo in rivista (Classe)
Prodotto della ricerca (Classe)

Label

U-Pb SHRIMP zircon dating of andesite from the Dolomite area (NE Italy): geochronological evidence for the early onset of Permian Volcanism in the eastern part of the southern Alps (Articolo in rivista) (literal)

Anno

2007-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1007/s00015-007-1219-z (literal)

Alternative label

VISONÀ D; FIORETTI AM; POLI E; ZANFERRARI A; FANNING M (2007)
U-Pb SHRIMP zircon dating of andesite from the Dolomite area (NE Italy): geochronological evidence for the early onset of Permian Volcanism in the eastern part of the southern Alps
in Swiss journal of geosciences (Print)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

VISONÀ D; FIORETTI AM; POLI E; ZANFERRARI A; FANNING M (literal)

Pagina inizio

313 (literal)

Pagina fine

324 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

100 (literal)

Rivista

Swiss journal of geosciences (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

11 (literal)

Note

Google Scholar (literal)
ISI Web of Science (WOS) (literal)
Scopu (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

1 Dipartimento di Mineralogia e Petrologia, Universita', corso Garibaldi 37, 35137 Padova, Italy. E-mail: dario.visona@unipd.it 2 CNR - Istituto di Geoscienze e Georisorse, c.so Garibaldi 37, 35137 Padova, Italy 3 Dipartimento di Georisorse e Territorio, Università di Udine, via del Cotonificio 144, I-33100 Udine, Italy 4 Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia (literal)

Titolo

U-Pb SHRIMP zircon dating of andesite from the Dolomite area (NE Italy): geochronological evidence for the early onset of Permian Volcanism in the eastern part of the southern Alps (literal)

Abstract

The Athesian Volcanic District (AVD), a thick sequence of andesitic to rhyolitic lava and ignimbrite, overlies both the Variscan basement of the Dolomites and, where present, the continental basal conglomerate of Upper Carboniferous(?) to Early Permian age. This volcanic activity is known to mark the margin of the intra-Pangea megashear system between Gondwana and Laurasia, the onset age of which is determined in this study. SHRIMP U-Pb dating on zircon from Ponte Gardena/Waidbruck (Isarco/Eisack valley) basaltic andesite yields an age of 290.7 ± 3 Ma, providing the oldest record of andesite volcanic activity yet documented in the AVD. Two younger dates (279.9 ± 3.3 and 278.6 ± 3.1 Ma) obtained for the andesitic necks of M. dei Ginepri (Eores/Aferer valley) and Col Quaternà (western Comelico), respectively, probably represent a second pulse of andesite magmatic activity. Near Chiusa/Klausen, the volcanoclastic deposits at the bottom of the Funes/Villnöss valley volcano-sedimentary complex only contain detrital zircons, dated at 469 ± 6 Ma; these probably derive from erosion of Paleozoic porphyroids. Other zircons from the same sediments and inherited cores of magmatic andesite crystals give Paleoproterozoic (1953.6 ± 22.1, 1834.6 ± 69.3, 1773.6 ± 25.1 Ma), Early Neoproterozoic (1015 ± 14 Ma) and Late Neoproterozoic (728.4 ± 9.6, 687.6 ± 7.6 Ma) ages. These ancient detrital and inherited zircon ages fit the model that envisages the Dolomite region as being tectonically coherent with Africa, at least until the Lower Permian. (literal)

Prodotto di