The transition from subduction arc to slab tearing: Evidence from Capraia Island, northern Tyrrhenian Sea

Gasparon, Massimo, Rosenbaum, Gideon, Wijbrans, Jan and Manetti, Piero (2009) The transition from subduction arc to slab tearing: Evidence from Capraia Island, northern Tyrrhenian Sea. Journal of Geodynamics, 47 1: 30-38. doi:10.1016/j.jog.2008.06.004


Author Gasparon, Massimo
Rosenbaum, Gideon
Wijbrans, Jan
Manetti, Piero
Title The transition from subduction arc to slab tearing: Evidence from Capraia Island, northern Tyrrhenian Sea
Journal name Journal of Geodynamics   Check publisher's open access policy
ISSN 0264-3707
Publication date 2009-01-01
Year available 2008
Sub-type Article (original research)
DOI 10.1016/j.jog.2008.06.004
Open Access Status
Volume 47
Issue 1
Start page 30
End page 38
Total pages 9
Editor R. Stephenson
Place of publication Oxford, England
Publisher Pergamon-Elsevier Science
Language eng
Subject C1
970104 Expanding Knowledge in the Earth Sciences
040303 Geochronology
Abstract The magmatic island of Capraia in the northern Tyrrhenian Sea records late stages in the evolution of a retreating subduction zone following continental accretion. Subduction rollback in the northern Tyrrhenian Sea was accompanied by an eastward migrating magmatic arc that coincided with Capraia at not, vert, similar7.7 Ma. This was followed by segmentation of the subducting slab through eastward propagating tear faults. We present high-precision, step-heating 40Ar/39Ar data that provide robust constraints for the timing of magmatism in Capraia, indicating that the island was subjected to two distinct magmatic episodes. The bulk of the island, characterised by typical calcalkaline, subduction-related volcanic rocks, formed during a relatively short period between 7.7 and 7.2 Ma. This major magmatic event was followed by a period of quiescence between 7.1 and 4.8 Ma. Magmatic activity resumed at 4.8 Ma, with the eruption of shoshonites from a monogenic centre in the southern part of the island. We interpret the latter as a magmatic event triggered by the formation of a tear fault within the subduction slab. The example provides a unique insight into the destruction of a subduction system during the interlinked process of subduction rollback, slab segmentation, and the development of slab tear faults.
Keyword Subduction
Slab rollback
Tear fault
Magmatism
Tyrrhenian Sea
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID A39600213
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Earth Sciences Publications
 
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Created: Mon, 20 Apr 2009, 09:48:23 EST by Ms Christine Sinclair on behalf of School of Earth Sciences