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Casetta, Federico, Ickert, Ryan B, Mark, Darren F, Bonadiman, Costanza, Giacomoni, Pier Paolo, Ntaflos, Theodoros, Coltorti, Massimo (2019) The Alkaline Lamprophyres of the Dolomitic Area (Southern Alps, Italy): Markers of the Late Triassic Change from Orogenic-like to Anorogenic Magmatism. Journal of Petrology, 60 (6) 1263-1298 doi:10.1093/petrology/egz031

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Reference TypeJournal (article/letter/editorial)
TitleThe Alkaline Lamprophyres of the Dolomitic Area (Southern Alps, Italy): Markers of the Late Triassic Change from Orogenic-like to Anorogenic Magmatism
JournalJournal of Petrology
AuthorsCasetta, FedericoAuthor
Ickert, Ryan BAuthor
Mark, Darren FAuthor
Bonadiman, CostanzaAuthor
Giacomoni, Pier PaoloAuthor
Ntaflos, TheodorosAuthor
Coltorti, MassimoAuthor
Year2019 (June 1)Volume60
Page(s)1263-1298Issue6
PublisherOxford University Press (OUP)
DOIdoi:10.1093/petrology/egz031Search in ResearchGate
Mindat Ref. ID176558Long-form Identifiermindat:1:5:176558:2
GUID3f5e205d-5c5e-4b18-8f14-6105172fe9ab
Full ReferenceCasetta, Federico, Ickert, Ryan B, Mark, Darren F, Bonadiman, Costanza, Giacomoni, Pier Paolo, Ntaflos, Theodoros, Coltorti, Massimo (2019) The Alkaline Lamprophyres of the Dolomitic Area (Southern Alps, Italy): Markers of the Late Triassic Change from Orogenic-like to Anorogenic Magmatism. Journal of Petrology, 60 (6) 1263-1298 doi:10.1093/petrology/egz031
Plain TextCasetta, Federico, Ickert, Ryan B, Mark, Darren F, Bonadiman, Costanza, Giacomoni, Pier Paolo, Ntaflos, Theodoros, Coltorti, Massimo (2019) The Alkaline Lamprophyres of the Dolomitic Area (Southern Alps, Italy): Markers of the Late Triassic Change from Orogenic-like to Anorogenic Magmatism. Journal of Petrology, 60 (6) 1263-1298 doi:10.1093/petrology/egz031
In(2019, June) Journal of Petrology Vol. 60 (6) Oxford University Press (OUP)
Abstract/NotesAbstractWe present the first complete petrological, geochemical and geochronological characterization of the oldest lamprophyric rocks in Italy, which crop out around Predazzo (Dolomitic Area), with the aim of deciphering their relationship with Triassic magmatic events across the whole of the Southern Alps. Their Mg# of between 37 and 70, together with their trace element contents, suggests that fractional crystallization was the main process responsible for their differentiation, together with small-scale mixing, as evidenced by some complex amphibole textures. Moreover, the occurrence of primary carbonate ocelli suggests an intimate association between the alkaline lamprophyric magmas and a carbonatitic melt. 40Ar/39Ar data show that the lamprophyres were emplaced at 219·22 ± 0·73 Ma (2σ; full systematic uncertainties), around 20 Myr after the high-K calc-alkaline to shoshonitic, short-lived, Ladinian (237–238 Ma) magmatic event of the Dolomitic Area. Their trace element and Sr–Nd isotopic signatures (87Sr/86Sri = 0·7033–0·7040; 143Nd/144Ndi = 0·51260–0·51265) are probably related to a garnet–amphibole-bearing lithosphere interacting with an asthenospheric component, significantly more depleted than the mantle source of the high-K calc-alkaline to shoshonitic magmas. These features suggest that the Predazzo lamprophyres belong to the same alkaline–carbonatitic magmatic event that intruded the mantle beneath the Southern Alps (e.g. Finero peridotite) between 190 and 225 Ma. In this scenario, the Predazzo lamprophyres cannot be considered as a late-stage pulse of the orogenic-like Ladinian magmatism of the Dolomitic Area, but most probably represent a petrological bridge to the opening of the Alpine Tethys.

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