A succession of mid-ocean ridge basalts (linked at their base to serpentinite slivers) with intercalations of chert levels of Middle and Late Triassic, as well as Early and Middle Jurassic ages have been recently found in the Argolis Peninsula, Greece. This succession is very similar and has a tectonic position comparable with the Triassic basalts of the “Volcano-sedimentary Formation” at the top of the “Rubik Complex” of the Mirdita Ophiolitic Nappe in Albania. Moreover, Argolis and Mirdita ophiolites pertain to the same ophiolitic belt, which extends from Mirdita to Pindos, Vourinos, Othris and Argolis. The “Volcano-sedimentary Formation” was previously interpreted by as an Upper Jurassic sequence which “precède de peu ou accompagne le début de l’ouverture (océanisation) proprement dite du domaine ophiolitique de Mirdita”. Bortolotti et al. (1996) confirmed this interpretation (“the sequence can be interpreted as a product of syn-rift, subalkaline magmatism associated with thinning of the continental margin during the Middle Triassic” but, on the base of the radiolarian stratigraphy, retro-dated the sequence to the Middle and Late Triassic times. The aim of this article is to assess the petrology and tectono-magmatic significance of basalts from this complex in the northern Albania Mirdita zone in relation to their age of formation, for providing new data for a more detailed reconstruction of the Triassic events.
New evidence for Triassic MORB magmatism in the northern Mirdita Zone ophiolites (Albania
SACCANI, Emilio
2004
Abstract
A succession of mid-ocean ridge basalts (linked at their base to serpentinite slivers) with intercalations of chert levels of Middle and Late Triassic, as well as Early and Middle Jurassic ages have been recently found in the Argolis Peninsula, Greece. This succession is very similar and has a tectonic position comparable with the Triassic basalts of the “Volcano-sedimentary Formation” at the top of the “Rubik Complex” of the Mirdita Ophiolitic Nappe in Albania. Moreover, Argolis and Mirdita ophiolites pertain to the same ophiolitic belt, which extends from Mirdita to Pindos, Vourinos, Othris and Argolis. The “Volcano-sedimentary Formation” was previously interpreted by as an Upper Jurassic sequence which “precède de peu ou accompagne le début de l’ouverture (océanisation) proprement dite du domaine ophiolitique de Mirdita”. Bortolotti et al. (1996) confirmed this interpretation (“the sequence can be interpreted as a product of syn-rift, subalkaline magmatism associated with thinning of the continental margin during the Middle Triassic” but, on the base of the radiolarian stratigraphy, retro-dated the sequence to the Middle and Late Triassic times. The aim of this article is to assess the petrology and tectono-magmatic significance of basalts from this complex in the northern Albania Mirdita zone in relation to their age of formation, for providing new data for a more detailed reconstruction of the Triassic events.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
