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Helium and strontium isotopes in the lavas from Mt. Vulture volcano: implications for its geodynamic meaning.
No full textMt. Vulture volcano (Italy): a geochemical contribution to the origin of fluids and to a better definition of its geodynamic setting
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Chemical and isotopic (C and S) composition of groundwaters from the Mt.Vulture volcanic system
No full textMt. Vulture volcano is located in the most external part of
the Apennine orogene (southern Italy), almost at the edge of
the Apulian foreland. The volcanic activity occurred up to 130
Kyrs ago. The volcano is formed by a main feldspar-bearing
series of pyroclastic rocks and subordinate lava flows, ranging
in composition from basanite and foidite to phonolites
(Schiattarella et al., 2005). Rare lava flows and dykes, with
distinctly more silica-undersaturated composition melilitites,
melilite ankaratrites, and the ‘Melfi’ haüynophyre, were also
emplaced. Carbonatite-melilite magmas fed the final phase of
volcanism producing maar-type craters. The large Na and S
contents of the Vulture magmas (Marini et al., 1994) result in
the the widespread presence of sodalite-group phases among
the feldespathoids (De Fino et al., 1982; Di Muro et al., 2004).
Most groundwaters are characterized by gas bubbling. In
order to investigate the origin of solutes a total of 25 springs
and wells were analyzed for the major and minor element
contents, the isotopic composition of carbon in the total
dissolved carbon (TDC) and sulfur in the aqueous sulfate. The
chemical data suggest that the effects due to water-rock
interaction are largely controlled by the input of CO2
. The
dissolution of CO2
in the water causes a substantial increase in
its acidity, thus promoting the alteration of the rocks. Good
correlations exist among alkalinity, electric conductibility and
Na
+
, Ca
2+
, SO4
2-
concentrations. The alkaline-earthbicarbonate and alkaline-bicarbonate compositions of the
waters are in keeping with the major role played by CO2
in the
alteration processes.
The G
13
C values of TDC corroborate the involvement of
two carbon sources. The first one is biogenic CO2
, while the
second one is magmatic. The G
34
S values of SO4
2-
are all
positive and similar to those measured by Marini et al. (1994)
in the haüynophyre magma, thus supporting for aqueous
sulfate a main origin from leaching of volcanites. In few
springs, however, some contribution of SO4
2-
from dissolution
of Triassic evaporite at depth cannot be excluded
Rizzo, G., Buccione, R., Paternoster, M., 2021. Natural sources of trace elements in the atmosphere and their influence on human health. Dust 2021, IV International Conference on Atmospheric Dust, Monopoli, Italy, 4-7 October 2021.
No full textGroundwater recharge areas of the Mt. Vulture volcanic aquifer by means of hydrogeochemical data and stable isotopic tracer.
No full textEnvironmental isotope techniques and hydrogeochemical
analysis were employed to identify the recharge area of Mt.
Vulture hydrogeological basin placed along the external edge
of the Apennine Chain (southern Italy). The groundwater in
the studied area, meteoric in origin [1], derived from seepage
rainwater flowing from the highest to the lowest altitude,
through the volcanic leached host rock. The Vulture basin
shows an altitude gradients of almost 1000 meters providing
good conditions for application of water stable isotopes. Water
sample were collected at 48 locations, for stable isotope (ä18O,
äD) and major ion analysis. Seventeen springs were sampled
from June 2007 to June 2008 along an altitudinal gradient
between 340 masl and 1100 masl. Thirty-one groundwater
samples were taken from the discharge of operating wells in
the Vulture basin, located between 352 and 960 masl.
Calculated recharge altitudes of studied aquifer showed that
source areas of mainly precipitation recharge, estimated on the
basis of the local vertical isotopic gradient (-0.17. ä18O/100;
[1]), are generally located between 700 and 1200 masl. The
isotope pattern of the volcanic aquifer reflects the spatial
separation of different sources of recharge. Isotopic signatures
in the south and north-eastern areas of the volcanic aquifer
indicate a considerable recharge contribution by flow
discharged from the adjacent volcanic domain and minor
recharge input comes from fluvio-lacustrine deposits. The
north-western sectors is the main recharge area of the most
investigated sampling points. No relevant evaporation effects
have been detecte
A Geochemical Survey of the Telese Hypothermal Spring, Southern Italy: Sulfate Anomalies Induced by Crustal Deformation
No full textThis study deals with a chemical survey (major ions and Li+, F−, Br−, and NO3−) on water samples collected from April 1998 to April 1999, from the Telese thermal spring, southern Italy, in order to investigate possible variations in the chemical composition of the spring. Water samples are of the calcium bicarbonate type, with small fluctuations in outlet temperature (20.05 ± 0.23°C), pH (6.23 ± 0.16), and TDS (2415 ± 35 mg/l). The concentrations of major ions stayed nearly constant, except for SO42−. All analyzed waters are saturated or oversaturated relative to calcite and dolomite. The higher saturation indices of the water samples relative to calcite and dolomite observed during the summer of 1998 is interpreted in terms of the lower rainfall during the dry season, inducing a lower supply of CO2 to the feeding aquifer at depth. The sharp decrease of SO42− in the December 1998 to January 1999 water samples during the wet season may be ascribed to a drop in the supply of H2S from a deep-seated source due to a temporary change of stress regime. We suggest that the crustal permeability has diminished in coincidence with the end of a seismic swarm, inducing a change in the sulfate content
Geochemistry of dissolved gases at Mt. Vulture volcano (southern Apennines): evidences of a significant release of deep gases.
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Heavy metal and trace element distributions in groundwater from Mt. Vulture volcanic area (southern Italy)
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