In the Argentera-Mercantour Massif, swarms of high-K calc-alkaline lamprophyres intruded into Carboniferous migmatites and early Permian granites, likely in Permian-Triassic times. The dykes collected multiple magmatic injections, the latest of which of alkaline affinity. Syn-intrusive vesicles and straight chilled margins suggest that the lamprophyres emplaced at a shallow crustal level. Lower greenschist facies mineral assemblages replaced lamprophyre igneous minerals as a result of late-intrusive hydrothermal circulation that occurred soon after the dyke emplacement. The hydrothermal event is constrained at T=300–350°C and P < 0.1 GPa by matching thermobarometry and pseudosection results. During the Alpine collision, the lamprophyreswere intersected by upper greenschist faciesmylonitic shear zones developed at T= 420–450°C and P=0.2–0.4 GPa,which are the metamorphic peak conditions of the Argentera-MercantourMassif in Alpine times.
Evidence of Tethyan continental break-up and Alpine collision in the Argentera-Mercantour Massif, Western Alps / M. Filippi, D. Zanoni, J.M. Lardeaux, M.I. Spalla, G. Gosso. - In: LITHOS. - ISSN 0024-4937. - 372-373(2020 Nov 01).
Titolo: | Evidence of Tethyan continental break-up and Alpine collision in the Argentera-Mercantour Massif, Western Alps |
Autori: | ZANONI, DAVIDE (Secondo) SPALLA, MARIA IOLE (Penultimo) GOSSO, GUIDO GIUSEPPE MAGGIORINO (Ultimo) |
Parole Chiave: | High-K calc-alkaline lamprophyres, Permian-Triassic crustal thinning, Alpine collision, External crystalline Massifs, Helvetic-Dauphinois-Provençal domain |
Settore Scientifico Disciplinare: | Settore GEO/03 - Geologia Strutturale Settore GEO/07 - Petrologia e Petrografia |
Progetto: | Dipartimenti di Eccellenza 2018-2022 - Dipartimento di SCIENZE DELLA TERRA "ARDITO DESIO" |
Data di pubblicazione: | 1-nov-2020 |
Rivista: | |
Tipologia: | Article (author) |
Data ahead of print / Data di stampa: | 7-lug-2020 |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1016/j.lithos.2020.105653 |
Appare nelle tipologie: | 01 - Articolo su periodico |
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