Tectonics, structural analysis and geodynamic evolution of the Maghrebian Flysch Basin and Ligurian Accretionary Complex Units: Examples in the Western Mediterranean Area

• Main Author: Tramparulo, Francesco D'Assisi
• Format: Doctoral or Postdoctoral Thesis
• Language: Italian; English
• Published: 2015
• Subjects: Diamante; Dorsale; Terranova
• Online Access: http://www.fedoa.unina.it/10187/; http://www.fedoa.unina.it/10187/1/Ph.D%20Thesis%20Tramparulo%20Francesco.pdf; https://doi.org/10.6092/UNINA/FEDOA/10187

This work provides a structural study on some successions of the Ligurian Accretionary Complex (LAC; southern Italy), Maghrebian Flysch Basin (MFB; Morocco) and External Dorsale Calcaire (Morocco). The LAC Units, cropping out in the southern Apennines include the sedimenary deep basin successions of Nord Calabrese, Parasicilide and Sicilide. Presently they are the highest tectonic units of the South Apennine fold and thrust belt. They are all characterized by a polyphasic and progressive deformation related to the Early Miocene inclusion in the tectonic accretionary wedge, by means of a frontal accretion mechanism, with a mean E/SE tectonic vergence. A subsequent deformation stage, associated to the eastward migration of the thrust front, affecting also the Middle-Upper Miocene unconformable wedge-top basin deposits, was characterized by a mean E/NE tectonic transport. In this orogenic phase the Apennine thrust sheet pile, formed by LAC and Apennine Platform Units, tectonically covered the successions located in the westernmost sector of the Lagonegro-Molise Basin. Finally a Pliocene-Middle Pleistocene regional fold set deformed the whole orogenic prism, comprised the LAC Units as consequence of a thick-skinned tectonics expressed by means of deeply rooted thrusts in the buried Apulian Platform carbonates. The metamorphic units of LAC, analyzed in this study, are the Frido and Diamante-Terranova Units, cropping out at Calabria-Basilicata boundary and northern Calabria, respectively. Both units are characterized by a HP/LT metamorphism reaching pressures of ca. 1.4/1.2 and 1.0 GPa and temperatures of 350 360 and 380 °C, respectively. The HP/LT parageneses include the Fe-carpholite, chlorite and phengite for the Frido and glaucophane, lawsonite, epidote and chlorite for the Diamante-Terranova Unit. The tectonic exhumation was recorded by Ca amphiboles. The P-T-paths, presented below, of both units indicate a cool and rapid exhumation. This is testified also by the preservation of HP/LT mineral parageneses and by ...