Cadomian metabasites of the Eastern Pyrenees revisited
نویسندگان
چکیده
This study presents a new geochemical, petrological, and geochronological U–Pb dataset from Ediacaran metabasites of the Canigó Cap de Creus massifs, Eastern Pyrenees. The rocks are composed calcic amphibole + plagioclase chlorite epidote ± quartz plus titanite apatite ilmenite biotite rutile as accessory phases show relict igneous textures. Peak pressure-temperature determinations share common conditions, ranging 452–482ºC 5.2–7.7kbar. These intermediate P-T conditions suggest Barrovian-type metamorphism, most likely related to collisional setting. correspond evolved basaltic (Mg#<0.55) with moderate TiO2 content (up 2.08wt.%) relatively low Cr (43–416ppm). moderately enriched in light rare earth elements (LREE) relative heavy (HREE) (average (La/Lu)n 2.7) N-MORB normalized multi-element patterns negative slopes, prominent Nb anomalies ((Nb/La)NMORB=0.33–0.78). variations akin island arc tholeiites generated back-arc basins other described Pyrenees putative age, they differ Ordovician tholeiitic massif, which derived contaminated E-MORB source. positive ƐNd(T) values (0.82–3.05) studied preclude notable contribution an older continental crust. U-Pb dating (LA-ICP-MS) one chlorite-rich schist sample contact massif yielded main peak at ca. 632Ma. We argue that Cadomian formed during extension margin Gondwana were later affected by (probably early Variscan) medium-P metamorphism before HT-LP classically
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ژورنال
عنوان ژورنال: Geologica Acta
سال: 2022
ISSN: ['1695-6133', '1696-5728']
DOI: https://doi.org/10.1344/geologicaacta2022.20.13