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| Titel |
Geochemical characterization of fluids along the Dead Sea Rift: implications for fluids sources and regional geodynamic setting |
| VerfasserIn |
Claudio Inguaggiato, Paolo Censi, Walter D'Alessandro, Pierpaolo Zuddas |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250125515
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| Publikation (Nr.) |
 EGU/EGU2016-5104.pdf |
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| Zusammenfassung |
| The Dead Sea Fault where a lateral displacement between the African and Arabian plates
occurs is characterized by anomalous heat flux in the northern Israel area close to the border
with Syria and Jordan (Shalev et al., 2012). The concentrations of He and CO2, and isotopic
composition of He and total dissolved inorganic carbon were studied in cold and
thermal waters collected along the Dead Sea Fault, in order to investigate the source
of volatiles and their relationship with the tectonic framework of the Dead Sea
Fault.
The waters with higher temperature (up to 57.2 ˚ C) are characterized by higher amounts
of CO2and helium (up to 55.72 and 1.91*10−2 cc l−1, respectively). Helium isotopic data
(R/Ra from 0.11 to 2.14) and 4He/20Ne ratios (0.41 - 106.86) show the presence of
deep-deriving fluids consisting of a variable mixture of mantle and crust end-members, with
the former reaching up to 35%. Carbon isotope signature of total dissolved carbon from hot
waters falls within the range of magmatic values, suggesting the delivery of deep-seated CO2.
The geographical distribution of helium isotopic data and isotopic carbon (CO2) values
coupled with (CO2/3He ratios) indicate a larger contribution of mantle-derived fluids
affecting the northern part of the investigated area, where the waters reach the highest
temperature and anomalous heat flux was recognized by Shalev et al. (2012). Such
occurrence is probably favoured by the peculiar tectonic framework recognized in
the northern part of Israel (Segev et al., 2006), including a Moho discontinuity
up-rise and/or the presence of a deep fault system coupled with the recent magmatic
activity.
References:
Segev, A., Rybakov, M., Lyakhovsky, V, Hofstetter, A, Tibor, G., Goldshmidt, V., 2006.
The structure, isostasy and gravity field of the Levant continental margin and the southeast
Mediterranean area. Tectonophysics 425, 137-157.
Shalev, E., Lyakhosky, V., Weinstein, Y., Ben-Avraham, Z., 2013. The thermal structure
of Israel and Dead Sea Fault. Tectonophysics 602, 69-77. |
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