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Preliminary geochemical and isotopic data on springs along the Fella-Sava fault zone (NE Italy)
Language
English
Obiettivo Specifico
3.2. Tettonica attiva
Status
Published
JCR Journal
N/A or not JCR
Peer review journal
Yes
Title of the book
Issue/vol(year)
4/48(2007)
Publisher
OGS- Trieste
Pages (printed)
423-434
Issued date
December 2007
Alternative Location
Keywords
Abstract
During 2006, a geochemical survey was carried out on three perennial springs discharging along a segment of the Fella-Sava line, a transpressive lineament running in the eastern Southern Alps (Friuli, NE Italy). Waters have both a Ca-bicarbonate and a CaMg(Na)-HCO3SO4 sulfureous character. Oxygen and hydrogen isotopic data indicate a meteoric origin from catchments with different mean topographic elevation. The Sr isotopic composition of the Ca-bicarbonate water is consistent with circulation in Middle Triassic limestones; sulfureous waters have 87Sr/86Sr isotopic ratios which indicate interactions with the Upper Permian dolomite-evaporite layers, the latter representing the preferential decollement horizons during the compressive Alpine cycle. The isotopic data, the negative redox potential and the tritium activity for sulfureous springs suggest a long-lasting flow through different fracture systems. Limited effects of mixing between the deeper and superficial, low-salinity waters are observed. Speciation calculations indicate that sulfureous waters are oversaturated in calcite and silicate minerals, suggesting that cement deposition is an active process along the flowpaths. The formations of diagenetic seals in a compressive regime would contribute to fluid overpressuring in pores at a relatively shallow depth, where part of the seismic activity is concentrated. The SO4, Ca and Mg concentrations, in one of the sulfureous springs, show a marked increase which seems to be related to the seismic events in the area, and is attributed to the expulsion of pore fluids with high concentration of sulphate due to strain changes
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V., Semenza E. and Zanolla C.; 1989: Seismotectonics of the eastern southern-Apls: a rewiew. Boll. Geof. Teor.
Appl., XXXI, 109-136.
Song S.R., Ku W.Y., Chen Y.L., Lin I.C., Liu C.M., Kuo L.W., Yang T.F. and Lo H.J.; 2003: Groundwater chemical
anomaly before and after the Chi-Chi earthquake in Taiwan. TAO, 14, 311-320.
Toutain J.P. and Barbon C.J.; 1999: Gas geochemistry and seismotectonics: a review. Tectonophysics, 304, 1-27.
Valenza M. and Nuccio P.M.; 1993: Geochemical precursors of earthquakes. Some experiences in Italy. In: Isotopic
and geochemical precursors of earthquakes and volcanic eruptions, IAEATEDOC, 726, pp. 44-47.
Venturini C.; 1990: Cinematica neogenico-quaternaria del Sudalpino orientale (settore friulano). Studi Geol. Camerti,
vol. 2 CROP 1-1°, 109-116.
cases for calculating speciation of major, trace and redox elements in natural waters. US Geol. Survey Open-File
Rep., pp. 91-183.
Bernard P.; 2001: From the search of “precursors” to the research on “crustal transient”. Tectonophysics, 338, 225-
232.
Biagi P.F., Castellana L., Minafra A., Maggipinto G., Maggipinto T., Ermini A., Molchanov O., Khatkevich Y.M. and
Gordeev E.I.; 2006: Groundwater chemical anomalies connected with the Kamchatka earthquake (M=7.1) on
March 1992. Nat. Hazard Earth Syst. Sci., 6, 853-859.
Blanpied M.L., Lockner D.A. and Byerlee J.D.; 1992: An earthquake mechanism based on rapid sealing of faults.
Nature, 358, 574-576.
Boschetti T., Venturelli G., Toscani L., Barbieri M and Mucchino C.; 2005: The Bagni di Lucca thermal waters
(Tuscany, Italy): an example of Ca-SO4 waters with high Na/Cl and low Ca/SO4 ratios. J. Hydrol., 307, 270-293.
Byerlee, J.; 1992: The change in orientations of subsidiary shears near faults containing high pore fluid pressure.
Tectonophysics, 211, 295-303.
Carulli G.B. and Ponton M.; 1992: Interpretazione strutturale profonda del settore centrale carnico-friulano. Studi
Geol. Camerti, vol. 2 CROP 1-1°, 275-284.
Carulli G.B., Nicolich R., Rebez A. and Slejko D.; 1990: Seismotetonics of the northwest External Dinarides.
Tectonohysics, 179, 11-25.Craig H.; 1961: Isotopic variation in meteoric water. Science, 133, 1702-1703.
Doglioni C.; 2000: Sismotettonica dell’Italia nord-orientale e possibile comparazione con gli Appennini. In: Galadini
F., Meletti C. and Rebez A. (eds), Le ricerche del GNDT nel campo della pericolosità sismica (1996-1999), CNRGruppo
Nazionale Difesa Terremoti, Roma, pp. 51-58.
Favara R., Grassa F., Inguaggiato S. and Valenza M.; 2001: Hydrogeochemistry and stable isotopes of thermal springs:
earthquake-related chemical changes along Belice fault (Western Sicily). App. Geochem., 16, 1-17.
Gruppo di lavoro CPTI; 2004: Catalogo Parametrico dei Terremoti Italiani, versione 2004 (CPTI04). INGV, Bologna,
http://emidius.mi.ingv.it/CPTI04/.
Hartmann J. and Levy J.K.; 2005: Hydrogeological and Gasgeochemical Earthquake Precursors - A Review for
Application. Natural Hazards, 34, 279-304.
Heinicke J., Braun T., Burgassi P., Italiano F. and Martinelli G. 2006: Gas flux anomalies in seismogenic zones in the
Upper Tiber Valley, Central Italy. Geophysical Journal International, 167, 794-806.
Hickman S., Sibson R., and Bruhn R.; 1995: Introduction to special section: mechanical involvement of fluids infaulting. J. Geophys. Res., 100 B7, 12831-12840.
Howarth R.J. and McArthur J.M.; 1999: Look-up Table Version 3, 10/99.
Johnson T.M. and DePaolo D.J.; 1994: Interpretation of isotopic data in groundwater-rock systems: model development
and application to Sr isotope data from Yucca Mountain. Water Resour. Res., 30, 1571-1587.
Longinelli A. and Selmo E.; 2003: Isotopic composition of precipitation in Italy: a first owerall map. J. Hydrol., 270,
75-88.
Ludwig K.R.; 1994: Analyst. A computer program for control of a thermal-ionization single-collector massspectrometer.
U. S. G. S. Open-file report, pp. 92-543.
Merlini S., Doglioni C., Fantoni R. and Ponton M.; 2002: Analisi strutturale lungo un profili geologico tra la linea
Fella-Sava e l’avampaese adriatico (Friuli Venezia Giulia-Italia). Mem. Soc. Geol. It., 57, 293-300.
Michel R.L; 2005: Tritium in hydrologic cycle. In: Aggarwal P.K., Gat J.R. and Froehlich K.F.O. (eds), Isotopes in the
water cycle. Springer, pp. 53-66.
Nishizawa S., Igarashi G. and Sano Y.; 1998: Radon, Cl- and SO42- anomalies in hot spring water associated with 1995
earthquake swarm off the east coast of the Izu Peninsula, central Japan. App. Geochem., 13, 89-94.
Pizzino L., Burrato P., Quattrocchi F. and Valensise G.; 2004: Geochemical signatures of large active faults: the
example of the 5 February 1783, Calabrian earthquake (southern Italy). J. Seismology, 8, 363-380.
Rojstaczer S., Wolf S. and Michel R.; 1995: Permeability enhancement in the shallow crust as a cause of earthquakeinduced
hydrological changes. Nature, 373, 237-239.
Sibson R.H.; 1974: Frictional constraints on thrust, wrench and normal faults. Nature, 249, 542-544.
Sibson R.H.; 1990: Conditions for fault-valve behaviour. In: Knipe R.J. and Rutter E.H. (eds), Deformation
mechanisms, rheology and tectonics. Spec. Publ. Geol. Soc. Lond., 54, pp. 15-28.
Slejko D.; 2006: Carta della sismicità storica. In: Carulli G.B. (a cura di), Carta geologica del Friuli Venezia Giulia –
Note illustrative, S.E.L.C.A., Firenze, pp. 36-37.
Slejko D., Carulli G.B., Nicolich R., Rebez A., Zanferrari A., Cavallin A., Doglioni C., Carraro F., Castaldini D., Iliceto
V., Semenza E. and Zanolla C.; 1989: Seismotectonics of the eastern southern-Apls: a rewiew. Boll. Geof. Teor.
Appl., XXXI, 109-136.
Song S.R., Ku W.Y., Chen Y.L., Lin I.C., Liu C.M., Kuo L.W., Yang T.F. and Lo H.J.; 2003: Groundwater chemical
anomaly before and after the Chi-Chi earthquake in Taiwan. TAO, 14, 311-320.
Toutain J.P. and Barbon C.J.; 1999: Gas geochemistry and seismotectonics: a review. Tectonophysics, 304, 1-27.
Valenza M. and Nuccio P.M.; 1993: Geochemical precursors of earthquakes. Some experiences in Italy. In: Isotopic
and geochemical precursors of earthquakes and volcanic eruptions, IAEATEDOC, 726, pp. 44-47.
Venturini C.; 1990: Cinematica neogenico-quaternaria del Sudalpino orientale (settore friulano). Studi Geol. Camerti,
vol. 2 CROP 1-1°, 109-116.
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