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http://hdl.handle.net/2122/4495
Authors: | Dini, A.* Mazzarini, F.* Musumeci, G.* Rocchi, S.* |
Title: | Multiple hydro-fracturing by boron-rich fluids in the Late Miocene contact aureole of eastern Elba Island (Tuscany, Italy) | Journal: | Terra Nova | Series/Report no.: | 4/20 (2008) | Publisher: | Blackwell Publishing Ltd | Issue Date: | Aug-2008 | DOI: | 10.1111/j.1365.3121.2008.00823.x | URL: | http://www3.interscience.wiley.com/cgi-bin/fulltext/120840284/PDFSTART | Keywords: | Hydro-fractures geothermal systems Magmatism southern Tuscany |
Subject Classification: | 04. Solid Earth::04.01. Earth Interior::04.01.99. General or miscellaneous 04. Solid Earth::04.04. Geology::04.04.09. Structural geology |
Abstract: | In eastern Elba Island (Tuscany, Italy), a shallow crustal level felsic, tourmaline-bearing, dyke-sill swarm of Late Miocene age is associated with abundant tourmaline-quartz hydrothermal veins and metasomatic masses. Development of these veins and masses in the host rocks demonstrates multiple hydro-fracturing by magmatic, boron-rich saline fluid. Tourmalines in felsic dykes are schorl, whereas in veins and metasomatic masses, tourmaline composition ranges from schorl-dravite through dravite to uvite. This compositional shift is evidence for an increasing contribution to the magmatic boron-rich fluids by a Mg-Ca-Ti-rich external component represented by biotite-rich and amphibolite host rocks. This system can be envisaged as an exposed proxy of the high temperature hydrothermal system presently active in the deepest part of the Larderello-Travale geothermal field (Tuscany). |
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