Coexistence of low-angle normal and high-angle strike- to oblique-slip faults during Late Miocene mineralization in eastern Elba Island (Italy)

Liotta, Domenico; Brogi, Andrea; Meccheri, Marco; Dini, Andréa; Bianco, Caterina; Ruggieri, Giovanni

doi:10.1016/j.tecto.2015.06.025

Cited by 54 publications

(50 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When tourmaline saturation is reached, B-rich residual melts eventually react with earlier Fe-Mg phases, causing tourmaline Figure 1. Schematic geological map of Elba Island (after [9]). Geological units are grouped ad described as five "complexes" following [10].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental Investigation of Biotite-Rich Schist Reacting with B-Bearing Fluids at Upper Crustal Conditions and Correlated Tourmaline Formation

et al. 2017

Self Cite

View full text Add to dashboard Cite

Fluid-rock interaction experiments between a biotite-rich schist (from Mt. Calamita Formation, Elba Island, Italy) and B-bearing aqueous fluids were carried out at 500-600 • C and 100-130 MPa. The experiments have been carried out in order to reproduce the reaction, which would have produced tourmalinisation of the biotite schist, supposedly by circulation of magmatic fluids issued from leucogranitic dykes. The reacting fluids were either NaCl-free or NaCl-bearing (20 wt %) aqueous solutions, with variable concentration of H 3 BO 3 (0.01-3.2 M). The experimental results show that tourmaline (belonging to the alkali group) crystallise under high-temperature and upper crustal conditions (500-600 • C, 100-130 MPa) when H 3 BO 3 concentration in the system is greater than 1.6 M. The composition of tourmaline is either dravitic (Mg-rich) or schorlitic (Fe-rich), depending if an NaCl-bearing or NaCl-free aqueous solution is used. In the first case, a significant amount of Fe released from biotite dissolution remains in the Cl-rich solution resulting from the experiment. By contrast, when pure water is used, Na/K exchange in feldspars makes Na available for tourmaline crystallisation. The high concentration of Fe in the residual fluid has an important metallogenic implication because it indicates that the interaction between the saline B-rich fluid of magmatic derivation and biotite-rich schists, besides producing tourmalinisation, is capable of mobilising significant amounts of Fe. This process could have produced, in part or totally, the Fe deposits located close to the quartz-tourmaline veins and metasomatic bodies of the Mt. Calamita Formation. Moreover, the super-hot reservoir that likely occurs in the deepest part of the Larderello-Travale geothermal field would also be the site of an extensive reaction between the B-rich fluid and biotite-bearing rocks producing tourmaline. Thus, tourmaline occurrence can be a useful guide during deep drilling toward a super-hot reservoir.

show abstract

Section: Introductionmentioning

confidence: 99%

“…Thus, in order to ascertain the changes of tourmaline composition due to the presence/absence of NaCl in the reacting fluid, some experiments were also performed using a B- Figure 1. Schematic geological map of Elba Island (after [9]). Geological units are grouped ad described as five "complexes" following [10].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Biotite-Rich Schist Reacting with B-Bearing Fluids at Upper Crustal Conditions and Correlated Tourmaline Formation

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…The emplacement of granitic bodies since 3.8 Ma provides the heat source to the geothermal system (Gianelli et al, ; Gola et al, ; Farina et al, ). The Elba Island (70 km southwest of Larderello) is considered an exhumed geothermal system controlled by high‐angle strike‐ to oblique‐slip faults and it is widely considered a paleogeothermal system analog to the LTGF (Liotta et al, ).…”

Section: Geological Settingmentioning

confidence: 99%

“…The emplacement of granitic bodies since 3.8 Ma provides the heat source to the geothermal system (Gianelli et al, 1997;Gola et al, 2017;Farina et al, 2018). The Elba Island (70 km southwest of Larderello) is considered an exhumed geothermal system controlled by high-angle strike-to oblique-slip faults and it is widely considered a paleogeothermal system analog to the LTGF (Liotta et al, 2015). ENEL, the geothermal Italian company managing the LTGF, exploits two main reservoirs usually referred to as shallow and deep reservoirs (Romagnoli et al, 2010).…”

Section: Geological Settingmentioning

confidence: 99%

Tectonic and Anthropogenic Microseismic Activity While Drilling Toward Supercritical Conditions in the Larderello‐Travale Geothermal Field, Italy

et al. 2020

View full text Add to dashboard Cite

This study investigates the seismic activity occurring at the Larderello‐Travale geothermal field, central Italy, from June 2017 to January 2018. We deployed a network composed of nine broadband stations around the Venelle 2 well drilling for supercritical fluids. During the experiment, we recognize two types of seismic events (type 1 and type 2). Type‐1 events have clear P and S wave arrivals and occur in clusters both above and below the K‐horizon, which is a seismic reflector marking a debated transition zone at depth. The distribution and evolution of the seismic sequences suggest that the K‐horizon could be interpreted as a fluid‐rich region at near‐lithostatic pressures. Type‐2 events usually occur in swarms and show a periodic pattern, a narrow frequency band, and almost identical waveforms. Their source is estimated to be located near the well, and their occurrence ceases after about 3 weeks from the conclusion of the drilling. We propose a causal link with the drilling operations where pressure fronts inside the well may promote phase changes and fluid flow across the drilled formations. Our study sheds light on the fluid‐driven tectonic and anthropogenic seismic activity at the Larderello‐Travale geothermal field. More generally, we show that microseismic activity occurring during drilling in high‐pressure and high‐temperature conditions can remain at low magnitudes and that geothermal wells targeting geothermal fluids in such systems may be handled safely despite the critical conditions encountered at depth. The drilling of the Venelle 2 well is an encouraging example for the development of geothermal energy in critical conditions.

show abstract

“…In particular N-S trending normal faults produced rift basins offshore Sardinia (Sartori et al, 2004;Gaullier et al, 2014;Milia et al, 2017a). On the northern sector of the eastern Tyrrhenian margin (Tuscany, Elba) rift and supradetachment basins are controlled by NW-SE faults (Pascucci et al 1999;Dini et al, 2002;Liotta et al, 2015). Along the Campania margin are present rift basin (Cosentino et al, 2006) and low-angle normal faults linked to a Messinian extension trending NE-SW (Schiattarella et al, 2006;Iannace et al, 2018).…”

Section: Tectonic Model Of the Messinian Sedimentary Basinsmentioning

confidence: 99%

Extensional Messinian basins in the Central Mediterranean (Calabria, Italy): new stratigraphic and tectonic insights

Milia

Torrente

2018

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

View full text Add to dashboard Cite

The direction of extension and the architecture of the Messinian basins of the Central Mediterranean region is a controversial issue. By combining original stratigraphic analysis of wells and seismic profiles collected offshore and onshore Calabria, we reassess the tectonic evolution that controlled the sedimentation and basement deformation during Messinian times. Three main deep sedimentary basins in the Calabria area record a Messinian succession formed by two clays/shales-dominated subunits subdivided by a halite-dominated subunit. The correlation with the worldwide recognized stratigraphic features permit to define the chronology of the stratigraphic and tectonic events. Three main rift basins that opened in a N-S direction have been recognized. On the contrary a fourth supradetachment basin opened toward the East. We found that the basin subsidence was controlled by two stages of activity of normal faults and that Messinian rift basins evolve in a deep-water environment. The overall pattern of extensional faults of the Central Mediterranean corresponds to normal faults striking parallel to the trench and normal faults striking at an oblique angle to the trench (Fig. 14). In particular in Campania and Calabria regions are present two rifts parallel to trench and an intervening rift orthogonal to the trench. We maintain that the recognized Messinian rift basins can be interpreted according to the “Double-door saloon tectonics”.

show abstract

Coexistence of low-angle normal and high-angle strike- to oblique-slip faults during Late Miocene mineralization in eastern Elba Island (Italy)

Cited by 54 publications

References 54 publications

Experimental Investigation of Biotite-Rich Schist Reacting with B-Bearing Fluids at Upper Crustal Conditions and Correlated Tourmaline Formation

Experimental Investigation of Biotite-Rich Schist Reacting with B-Bearing Fluids at Upper Crustal Conditions and Correlated Tourmaline Formation

Tectonic and Anthropogenic Microseismic Activity While Drilling Toward Supercritical Conditions in the Larderello‐Travale Geothermal Field, Italy

Extensional Messinian basins in the Central Mediterranean (Calabria, Italy): new stratigraphic and tectonic insights

Contact Info

Product

Resources

About