HT–LP crustal syntectonic anatexis as a source of the Permian magmatism in the Eastern Southern Alps: evidence from xenoliths in the Euganean trachytes (NE Italy).
Posted on 2020-06-22 - 10:48
Oligocene trachytes from the Euganean Hills include various regionally metamorphosed gneissic and granulitic xenoliths. These xenoliths provide the unique opportunity to investigate Southalpine intermediate to deep crustal levels that are not presently exposed in the Eastern Alps. The estimated P–T conditions are in the range 780–850°C and 0.45–0.55 GPa for a migmatitic gneiss xenolith. The SHRIMP II U–Pb analyses on zircon from this xenolith provide concordant ages around 259.7±3.5 Ma, consistently with a PIXE U–Th–Pb age on monazite of 262±12 Ma. The Sr–Nd–Pb isotopic compositions, and major and trace element data show distinct origin for the different types of xenoliths. Mafic granulite xenoliths have an isotopic signature close to mantle-derived rocks and to Permian gabbroic rocks from the western–southern Alps. Metapelite xenoliths have high Sr and low Nd initial ratios like those of acid crustal rocks and could possibly represent the source of the crustal component, which is dominant in the acid Permian super-volcanoes. The migmatitic xenolith provides the first documented evidence for a Permian thermal event associated with crustal thinning in the Eastern Southern Alps. Here the South alpine basement escaped most of the Alpine crustal shortening and still preserves most of the original Permian extension under thick Mesozoic covers.
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Sassia, Raffaele; Mazzolia, Claudio; Merleb, Renaud; Brombinc, Valentina; Chiaradiad, Massimo; Dunkleye, Daniel J.; et al. (2020). HT–LP crustal syntectonic anatexis as a source of the Permian magmatism in the Eastern Southern Alps: evidence from xenoliths in the Euganean trachytes (NE Italy).. Geological Society of London. Collection. https://doi.org/10.6084/m9.figshare.c.5032337.v1
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AUTHORS (7)
RS
Raffaele Sassia
CM
Claudio Mazzolia
RM
Renaud Merleb
VB
Valentina Brombinc
MC
Massimo Chiaradiad
DD
Daniel J. Dunkleye
AM
Andrea Marzolia
CATEGORIES
KEYWORDS
Eastern Alpstrace element data showEuganean trachytesacid crustal rocksEastern Southern AlpsHTSouth alpine basementMafic granulite xenolithsPermian gabbroic rocksAlpine crustalPIXEPermian magmatismmantle-derived rocksgranulitic xenolithsmigmatitic xenolithmigmatitic gneiss xenolithPermian extensionMetapelite xenolithsEuganean Hillscrustal componentcrustal levelsIIOligocene trachytesNE Italyacid Permian super-volcanoesGeology