Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/7839
AuthorsSmith, S. A. F. 
Holdsworth, R. E. 
Collettini, C. 
TitleInteractions between low-angle normal faults and plutonism in the upper crust: Insights from the Island of Elba, Italy
Issue Date2011
Series/Report no./123 (2011)
DOI10.1130/B30200.1
URIhttp://hdl.handle.net/2122/7839
Keywordsfaults and plutonism
Subject Classification04. Solid Earth::04.07. Tectonophysics::04.07.99. General or miscellaneous 
Abstractlow-angle normal fault on the Island of Elba, Italy, was one of the principal structures active during extensional collapse of the Apennine fold-and-thrust belt. We investigate the relationships among the Zuccale fault, subsidiary footwall fault networks, and igneous bodies that were intruded into the immediate footwall of the Zuccale fault. Both brittle and ductile kinematic indicators found in association with fault zones and igneous bodies yield a consistent WNW-ESE extension direction, suggesting that faulting and intrusion overlapped in time. Structure contour analysis indicates that the Zuccale fault has a regional domal morphology. The dimensions and spatial location of the dome correlate with the likely subsurface position of the Porto Azzurro pluton, originally intruded at ~6 km depth. We propose that doming of the Zuccale fault may have been related in part to emplacement of the Porto Azzurro pluton as a tabular intrusion, involving some component of vertical infl ation and roof uplift. The immediate footwall of the Zuccale fault is everywhere crosscut by a complex, linked network of high- and low-angle extensional faults with observed displacements of <10 m. Mutual crosscutting relationships suggest that low- and high-angle faults were active broadly contemporaneously. The fi - nal geometry of the footwall fault networks is adequately explained by their position with respect to the regional domal structure, and they suggest that certain sections of the Zuccale fault were back-rotated—during doming—out of an orientation capable of accommodating continued regional extension.
Appears in Collections:Papers Published / Papers in press

Files in This Item:
File Description SizeFormat 
35.pdf14.52 MBAdobe PDFView/Open    Request a copy
Show full item record

Page view(s)

35
checked on Apr 25, 2017

Download(s)

17
checked on Apr 25, 2017

Google ScholarTM

Check

Altmetric