Deciphering large-scale superposed fold systems at shallow crustal levels in collision zones: insights from the Marguareis Massif (southwestern Alps)

Journal of Maps

Edoardo Sanit๠ Luca Pandolfi²  Michele Marroni²  Guido Gosso³  Jean-Marc Lardeaux⁴ 

[1] Dipartimento di Scienze della Terra, Università di Pisa, Pisa, Ital;Dipartimento di Scienze della Terra, Università di Firenze, Firenze, Ital;Dipartimento di Scienze della Terra, Università di Pisa, Pisa, Ital;Istituto di Geoscienze e Georisorse, CNR, Pisa, Ital;Ex Dipartimento di Scienze della Terra A. Desio, Università di Milano, Milan, Ital;Géosciences Azur, UMR CNRS Université de Nice-Sophia Antipolis, Nice, Franc;Centre for Lithospheric Research, Czech Geological Survey, Prague, Czech Republi;

关键词: Fold systems;    low-grade;    mapping;    Marguareis Massif;   

DOI  :  10.1080/17445647.2021.1982034

来源: Taylor & Francis

【 摘 要 】

We present and discuss the results of a field-based approach including accurate geological mapping and micro- to map-scale structural analysis to highlight the finite strain pattern recorded in Marguareis Unit, a massif deformed at shallow crustal levels at the boundary between Maritime and Ligurian Alps. We describe superposed tectonic structures developed under low-grade metamorphic conditions during the Alpine collision and nowadays exceptionally well recorded in the area of interest. We demonstrate that the structural frame of the Marguareis Unit results from superposition of fourfold systems, later segmented, but without significant displacements, by brittle faults.

【 授权许可】

CC BY