Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/11132
Authors: Massa, Giovanni* 
Musumeci, Giovanni* 
Mazzarini, Francesco* 
Pieruccioni, Diego* 
Title: Coexistence of contractional and extensional tectonics during the northern Apennines orogeny: the late Miocene out-of-sequence thrust in the Elba Island nappe stack
Issue Date: May-2017
Series/Report no.: /52 (2017)
DOI: 10.1002/gj.2761
URI: http://hdl.handle.net/2122/11132
Keywords: northern Apennines; Elba Island; nappe stack; large-scale folding
Subject ClassificationOut of sequence thrust during Miocene in northern Apennines
Abstract: In the northern Tyrrhenian Sea, the Elba Island is one of the westernmost portions of the northern Apennine inner belt. One of its noteworthy features is the anomalous tectonic repetition of continental-derived (Tuscan Unit) and oceanic-derived (Ligurian units) thrust sheets, lately intruded by late Miocene granitoids. Moreover, in detail, a slice of strongly deformed Ligurian peridotites results tectonically sandwiched between two thrust sheets of Tuscan units. This tectonic setting results from a middle Miocene folding and thrusting of the Apenninic nappe stack with development of large-scale antiform and out-of-sequence thrust. In central-eastern Elba Island, the folding of an imbricate stack is bracketed between Langhian (middle Miocene) and Messinian (late Miocene). Consequently, the anomalous repetition of Tuscan and Ligurian units thrust sheets gives evidence of middle-late Miocene shortening deformation post-dating nappe stack and pre-dating late Miocene–Pliocene granite emplacement. We suggest that the architecture of the Elba Island nappe stack documents the coexistence of early-middle Miocene contractional and extensional tectonics in an overall convergent tectonic setting in the westernmost zone of northern Apennines. Extensional tectonics in the upper portion of the wedge, balancing transient gravitational instabilities due to over-thickened conditions, were followed by a renewal of contractional deformation leading to development of large-scale out-of-sequence thrust responsible for inversion of the stack order.
Appears in Collections:Papers Published / Papers in press

Files in This Item:
File Description SizeFormat 
Massa_et_al-2017-Geological_Journal.pdfCoexistence of contractional and extensional tectonics during the northern Apennines orogeny: the late Miocene out-of-sequence thrust in the Elba Island nappe stack1.7 MBAdobe PDFView/Open
Show full item record

Page view(s)

11
Last Week
0
Last month
0
checked on Nov 15, 2018

Download(s)

25
checked on Nov 15, 2018

Google ScholarTM

Check

Altmetric