Kinematics of slab tear faults during subduction segementation and implications for Italian magmatism

Rosenbaum, Gideon, Gasparon, Massimo, Lucente, Francesco P., Peccerillo, Angelo and Miller, Meghan S. (2008) Kinematics of slab tear faults during subduction segementation and implications for Italian magmatism. Tectonics, 27 2: 1-16. doi:10.1029/2007TC002143


Author Rosenbaum, Gideon
Gasparon, Massimo
Lucente, Francesco P.
Peccerillo, Angelo
Miller, Meghan S.
Title Kinematics of slab tear faults during subduction segementation and implications for Italian magmatism
Journal name Tectonics   Check publisher's open access policy
ISSN 0278-7407
1944-9194
Publication date 2008-04-25
Sub-type Article (original research)
DOI 10.1029/2007TC002143
Volume 27
Issue 2
Start page 1
End page 16
Total pages 16
Editor K. V. Hodges
O. Oncken
Place of publication Washington D.C. USA
Publisher Amer Geophysical Union
Collection year 2009
Language eng
Subject C1
040313 Tectonics
970104 Expanding Knowledge in the Earth Sciences
Abstract Tectonic activity in convergent plate boundaries commonly involves backward migration (rollback) of narrow subducting slabs and segmentation of subduction zones through slab tearing. Here we investigate this process in the Italian region by integrating seismic tomography data with spatiotemporal analysis of magmatic rocks and kinematic reconstructions. Seismic tomography results show gaps within the subducting lithosphere, which are interpreted as deep (100–500 km) subvertical tear faults. The development of such tear faults is consistent with proposed kinematic reconstructions, in which different rates of subduction rollback affected different parts of the subduction zone. We further suggest a possible link between the development of tear faults and the occurrence of regional magmatic activity with transitional geochemical signatures between arc type and OIB type, associated with slab tearing and slab breakoff. We conclude that lithospheric-scale tear faults play a fundamental role in the destruction of subduction zones. As such, they should be incorporated into reconstructions of ancient convergent margins, where tear faults are possibly represented by continental lineaments linked with magmatism and mineralization.
Keyword Subduction
Tomography
Magmatism
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article number TC2008

 
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Created: Sun, 19 Apr 2009, 21:56:15 EST by Ms Christine Sinclair on behalf of School of Earth Sciences