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Hydrofracturing-related sill and dyke emplacement at shallow crustal levels: the Eastern Elba Dyke Complex, Italy, Geological Society, London, Special Publications
Language
English
Obiettivo Specifico
3.3. Geodinamica e struttura dell'interno della Terra
3.5. Geologia e storia dei sistemi vulcanici
Status
Published
JCR Journal
N/A or not JCR
Peer review journal
Yes
Title of the book
Issue/vol(year)
/302 (2008)
Publisher
Geological Society of London
Pages (printed)
121-129
Issued date
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.
Type
article
File(s)
No Thumbnail Available
Name
GSL-SP_Mazzarini_et al_2008.pdf
Size
518.48 KB
Format
Adobe PDF
Checksum (MD5)
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