Crustal and upper mantle response to lithospheric segmentation in the northern Apennines

Rosenbaum, Gideon and Agostinetti, Nicola Piana (2015) Crustal and upper mantle response to lithospheric segmentation in the northern Apennines. Tectonics, 34 4: 648-661. doi:10.1002/2013TC003498


Author Rosenbaum, Gideon
Agostinetti, Nicola Piana
Title Crustal and upper mantle response to lithospheric segmentation in the northern Apennines
Journal name Tectonics   Check publisher's open access policy
ISSN 0278-7407
1944-9194
Publication date 2015-04
Year available 2015
Sub-type Article (original research)
DOI 10.1002/2013TC003498
Volume 34
Issue 4
Start page 648
End page 661
Total pages 32
Place of publication Hoboken, NJ, United States
Publisher Wiley-Blackwell Publishing
Collection year 2016
Language eng
Abstract Lithospheric tear faults are expected to develop in response to along-strike variations in the rates of slab rollback. However, the exact geometry of such structures and their crustal and upper mantle expressions are still debated. We present an analysis of seismic, structural and morphological features that possibly represent the expression of lithospheric segmentation in the northern Apennines. Geophysical observations show evidence for the existence of a discontinuity in the lithospheric structure beneath the northern Apennines, characterized by a change in the spatial distribution of intermediate-depth seismicity, along-strike variations in the pattern of crustal seismicity, and a bend in the Moho topography. The near-surface expression of this discontinuity is associated with an abrupt change in the morphology and exhumation history of the northern Apennines in the proximity of the Livorno-Sillaro Lineament. We interpret these features as evidence for incipient tearing of the lithospheric slab beneath the northern Apennines, marking the boundary between domains that underwent contrasting styles of lithospheric deformation, which are either associated with different rates of slab rollback or a transition from underplating to retreat. We suggest that similar types of structures may play a crucial role in the evolution of convergent plate boundaries, allowing segmentation of orogenic belts and facilitating the development of orogenic curvatures, Ultimately, further tearing along such structures could potentially lead to the occurrence of tear–related magmatism and the formation of slab windows.
Keyword Slab tearing
Apennines
Italy
Subduction
Slab rollback
Central Mediterranean
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Publications
Official 2016 Collection
 
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Created: Thu, 05 Mar 2015, 08:08:22 EST by Dr Gideon Rosenbaum on behalf of School of Earth Sciences