Petrological evolution of the Middle Triassic Predazzo Intrusive Complex, Italian Alps

Casetta, Federico; Coltorti, Massimo; Marrocchino, Elena

doi:10.1080/00206814.2017.1363676

Cited by 24 publications

(32 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Predazzo Complex is the largest of the Triassic intrusive igneous bodies of the Eastern Southern Alps. The intrusive rocks show wide variation in composition: monzonite is the dominant rock type, but monzodiorite, monzogabbro, gabbro with pyroxenite, granite, quartzsyenite and syenite, also occur (Lucchini et al 1982;Menegazzo Vitturi et al 1995;Visonà 1997;Carraro and Visonà 2003;Casetta et al 2018). The dike rocks are also highly diverse: latibasalt, latiandesite, K-basanite, monzosyenite, aplite and lamprophyre were reported by Gallitelli and Simboli (1971).…”

Section: Triassic Igneous Activity In the South Alpine Realm And Theimentioning

confidence: 99%

Traces of Carnian volcanic activity in the Transdanubian Range, Hungary

Dunkl

Farics

Józsa

et al. 2019

Int J Earth Sci (Geol Rundsch)

View full text Add to dashboard Cite

The South Alpine-Dinaridic realm was affected by igneous activity in the Middle Triassic; the marine carbonate platforms and the adjacent basins contain highly variable intrusive-volcanic assemblages. We studied the petrography and determined the zircon U-Pb ages of the Triassic volcanic products in the Transdanubian Range. The geochemical features and thus the geodynamic context of the magmatism are badly known, as the rocks experienced variable chemical alteration. The exact duration of the igneous activity is also poorly constrained, as the geochronological data of the former studies were obtained mostly by the weathering-sensitive K-Ar and Rb-Sr methods and thus some data even being younger than the age of the stratigraphic cover. The presence of andesite dikes and of pebbles and cobbles (< 20 cm) of basalt, andesite, rhyolite and of rhyolitic tuff in the Triassic carbonate platform deposits indicates that within the Transdanubian Range formed a volcanic complex in Triassic. The major mineralogical and geochemical features of the Transdanubian igneous suite are similar to the Triassic formations in the Southern Alps. However, dissimilar zircon composition excludes the immediate relationship of the zircon-bearing silicic formations in the two tectonic units. New U-Pb ages show that the beginning of the volcanic activity is probably coeval with the eruption of the widespread "pietra verde" trachytic tuffs in the Upper Anisian-Ladinian successions, but the majority of the ages are younger than those ash layers. The new age constraints give a benchmark for the termination of the volcanic activity in Carnian time in the Transdanubian Range.

show abstract

Section: Triassic Igneous Activity In the South Alpine Realm And Theimentioning

confidence: 99%

Traces of Carnian volcanic activity in the Transdanubian Range, Hungary

Dunkl

Farics

Józsa

et al. 2019

Int J Earth Sci (Geol Rundsch)

View full text Add to dashboard Cite

show abstract

“…the shallow intrusions and possible magmatic conduits of Monzoni-Predazzo (Casetta et al 2018). Small volumes of possibly Late Ladinian mafic magmatic products also occur in eastern Lombardy (Cassinis et al 2008).…”

Section: Triassic Magmatic Productsmentioning

confidence: 99%

“…The latites to trachytes contain plagioclase, K-feldspar, amphibole and biotite, whereas the rhyolites contain resorbed quartz, plagioclase, sanidine and biotite phenocrysts. All rocks are characterized by the high K 2 O and high K 2 O/Na 2 O ratios typical of the shoshonite suite (Sacerdoti & Sommavilla 1962;De Vecchi & Sedea 1983;Gasparotto & Simboli 1991;Obenholzner 1991;Casetta et al 2018).…”

Section: Petrological Characteristics Of Anisian-ladinian Igneous Promentioning

confidence: 99%

Timing and evolution of Middle Triassic magmatism in the Southern Alps (northern Italy)

Storck

Brack

Wotzlaw

et al. 2018

JGS

View full text Add to dashboard Cite

Middle Triassic magmatism in the Southern Alps (northern Italy) consists of widespread volcanoclastic deposits, basaltic lava flows and intrusive complexes. Despite their importance in understanding the geodynamic evolution of the westernmost Tethys, the timing of magmatic activity and the links between the different igneous products remain poorly understood. We present a comprehensive high-precision zircon U-Pb geochronology dataset for the major intrusive complexes and several volcanic ash layers and integrate this with a high-resolution stratigraphic framework of Middle Triassic volcanosedimentary successions. The main interval of Middle Triassic magmatism lasted at least 5.07 ± 0.06 myr. Magmatic activity started with silicic eruptions between 242.653 ± 0.036 and 238.646 ± 0.037 Ma, followed by a <1 myr eruptive interval of voluminous basaltic lava flows. Coeval mafic to intermediate intrusions dated at 238.190 ± 0.055 to 238.075 ± 0.087 Ma may represent feeder and subvolcanic complexes related to the basalt flows. The youngest products are silicic tuffs from latest Ladinian to early Carnian sequences dated at 237.680 ± 0.047 and 237.579 ± 0.042 Ma. Complemented by zircon trace element data, our high-resolution temporal framework places tight constraints on the link between silicic and mafic igneous products in a complex geodynamic setting. Supplementary material: Isotope dilution thermal ionization mass spectrometry U-Pb and laser ablation inductively coupled plasma mass spectrometry trace element data tables, sample coordinates, supplementary geochemical data, cathodoluminescence images of isotope dilution thermal ionization mass spectrometry dated zircons and supplementary field documentation are available at

show abstract

“…Doglioni, 1987;Vai, 1991;Gianolla et al 1998;Bortolotti & Principi, 2005;Beltrando et al 2015) and the apparent orogenic geochemical fingerprints of many of the magmatic products studied so far (e.g. De Vecchi & Sedea, 1983;Castellarin et al 1988;Sloman, 1989;Gasparotto & Simboli, 1991;Bonadiman et al 1994;Armienti et al 2003;Casetta et al 2018b;Lustrino et al 2019). What gained the interest of the geological community is the fact that this magmatism took place shortly before the break-up of Pangea, in a lithosphere that was previously affected by the Variscan collision and possibly by even older orogenic events.…”

Section: Introductionmentioning

confidence: 99%

“…This magmatism has been associated either to compressional, extensional and/or transtensional geodynamics (e.g. Crisci et al 1984;Castellarin et al 1988;Sloman, 1989;Bonadiman et al 1994;Armienti et al 2003;Csontos & Vörös, 2004;Beccaluva et al 2005;Doglioni & Carminati, 2008;Schmid et al 2008;Zanetti et al 2013;Abbas et al 2018;Bianchini et al 2018;Casetta et al 2018b;Storck et al 2019). Such contrasting interpretations are probably due to (1) the palaeogeographic position of the outcrops (at the edge between Gondwana and Laurasia), for which palinspastic reconstructions are still debated (e.g.…”

Section: Introductionmentioning

confidence: 99%

Triassic magmatism in the European Southern Alps as an early phase of Pangea break-up

et al. 2020

View full text Add to dashboard Cite

Magmatic rocks from the Dolomites, Carnic and Julian Alps, Italy, have been sampled to investigate the origin and geodynamic setting of Triassic magmatism in the Southern Alps. Basaltic, gabbroic and lamprophyric samples have been characterized for their petrography, mineral chemistry, whole-rock major and trace elements, and Sr, Nd and Pb isotopic compositions. Geothermobarometric estimates suggest that the basaltic magmas crystallized mostly at depths of 14–20 km. Isotopic data show variable degrees of crustal contamination decreasing westwards, probably reflecting a progressively more restitic nature of the crust, which has been variably affected by melting during the Permian period. Geochemical and isotopic data suggest that the mantle source was metasomatized by slab-derived fluids. In agreement with previous studies and based on geological evidence, we argue that this metasomatism was not contemporaneous with the Ladinian–Carnian magmatism but was related to previous subduction episodes. The lamprophyres, which likely originated some 20 Ma later by lower degrees of melting and at higher pressures with respect to the basaltic suite, suggest that the mantle source regions of Triassic magmatism in the Dolomites was both laterally and vertically heterogeneous. We conclude that the orogenic signatures of the magmas do not imply any coeval subduction in the surrounding of Adria. We rather suggest that this magmatism is related to the Triassic rifting episodes that affected the western Mediterranean region and that were ultimately connected to the rifting events that caused the break-up of Pangea during the Late Triassic – Early Jurassic period.

show abstract

Petrological evolution of the Middle Triassic Predazzo Intrusive Complex, Italian Alps

Cited by 24 publications

References 34 publications

Traces of Carnian volcanic activity in the Transdanubian Range, Hungary

Traces of Carnian volcanic activity in the Transdanubian Range, Hungary

Timing and evolution of Middle Triassic magmatism in the Southern Alps (northern Italy)

Triassic magmatism in the European Southern Alps as an early phase of Pangea break-up

Contact Info

Product

Resources

About