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Hydrofracturing-related sill and dyke emplacement at shallow crustal levels: the Eastern Elba Dyke Complex, Italy

By
Francesco Mazzarini
Francesco Mazzarini
1
Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Pisa
,
Via della Faggiola 32, 56100, Pisa
,
Italy
(e-mail: mazzarini@pi.ingv.it)
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Giovanni Musumeci
Giovanni Musumeci
2
Dipartimento di Scienze della Terra
,
Via S. Maria
,
53, Università di Pisa, 56100, Pisa
,
Italy
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Published:
January 01, 2008

Abstract

An example of sheet-like intrusion emplacement at very shallow crustal levels on Elba Island, Italy, is described. The Eastern Elba Dyke Complex (EEDC) consists of decimetre- to metre-thick sheeted aplites emplaced within intensely folded low-grade metamorphic rocks. Field data indicate that sill and dyke emplacement was controlled by mechanical discontinuities, represented by fractures in the host rocks, and was strongly favoured by magma overpressure. The occurrence of angular fragments of host rocks in the dyke border zones and the branching of sills testify to hydraulic fracturing. Analysis of the spatial distribution and geometry of EEDC sills and dykes provides clues on fluid pressure conditions and the stress state at the time of magma emplacement, as well as on the depth of emplacement. The calculated stress ratio and driving pressure ratio were used to estimate a magma overpressure of 6–54 MPa at the time of emplacement of the EEDC at a depth of about 2 km.

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Geological Society, London, Special Publications

Structure and Emplacement of High-Level Magmatic Systems

K. Thomson
K. Thomson
University of Birmingham, UK
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N. Petford
N. Petford
Bournemouth University, UK
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Geological Society of London
Volume
302
ISBN electronic:
9781862395503
Publication date:
January 01, 2008

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