Articolo in rivista, 2013, ENG

Geodynamic evolution of the ophiolites from Albania and Greece, (Dinaric-Hellenic belt): one, two or more oceanic basins?

Bortolotti V. [1]; Chiari M. [2]; Marroni M. [3, 4]; Pandolfi L. [3, 4]; Principi G. [1]; Saccani E. [5]

[1] Dipartimento di Scienze della Terra, Universita` di Firenze, Florence, Italy [2] Istituto di Geoscienze e Georisorse, CNR, Florence, Italy [3] Dipartimento di Scienze della Terra, Universita` di Pisa, Pisa, Italy [4] Istituto di Geoscienze e Georisorse, CNR, Pisa, Italy [5] Dipartimento di Scienze della Terra, Universita` di Ferrara, Ferrara, Italy

All the geological constraints for an exhaustive reconstruction of the Triassic to Tertiary tectonic history of the southern Dinaric-Hellenic belt can be found in Albania and Greece. This article aims to schematically reconstruct this long tectonic evolution primarily based on a detailed analysis of the tectonic setting, the stratigraphy, the geochemistry, and the age of the ophiolites. In contrast to what was previously reported in the literature, we propose a new subdivision on a regional scale of the ophiolite complexes cropping out in Albania and Greece. This new subdivision includes six types of ophiolite occurrences, each corresponding to different tectonic units derived from a single obducted sheet. These units are represented by: (1) sub-ophiolite mélange, (2) Triassic ocean-floor ophiolites, (3) metamorphic soles, (4) Jurassic fore-arc ophiolites, (5) Jurassic intra-oceanic-arc ophiolites, and (6) Jurassic back-arc basin ophiolites. The overall features of these ophiolites are coherent with the existence of a single, though composite, oceanic basin located east of the Adria/Pelagonian continental margin. This oceanic basin was originated during the Middle Triassic and was subsequently (Early Jurassic) affected by an east-dipping intra-oceanic subduction. This subduction was responsible for the birth of intra-oceanic-arc and back-arc oceanic basins separated by a continental volcanic arc during the Early to Middle Jurassic. From the uppermost Middle Jurassic to the Early Cretaceous, an obduction developed, during which the ophiolites were thrust westwards firstly onto the neighboring oceanic lithosphere and then onto the Adria margin.

International journal of earth sciences (1999, Internet) 102 , pp. 783–811

Keywords

ophiolites, supra-subduction, back-arc, obduction, triassic jurasic

CNR authors

Marroni Michele, Pandolfi Luca, Chiari Marco

CNR institutes

IGG – Istituto di geoscienze e georisorse

ID: 209608

Year: 2013

Type: Articolo in rivista

Creation: 2013-05-07 17:49:25.000

Last update: 2016-03-31 09:52:15.000

External IDs

CNR OAI-PMH: oai:it.cnr:prodotti:209608

ISI Web of Science (WOS): 000316678000014