Publication Date:
2017-04-04
Description:
A rain gauge network consisting of five sites located at different altitudes,
ranging from 320 to 1285 m.a.s.l., was installed at Mt. Vulture volcano (southern Italy).
Rain water samples were collected monthly over a two-year period and their isotopic composition
(d18O and dD) was analyzed. During the same period, circulating groundwater was
sampled from 24 springs and wells distributed throughout the study area. Monthly isotopic
composition values were used to determine the local meteoric water line (LMWL). Its
slope is slightly lower than the relationship defined by Longinelli and Selmo (Longinelli,
A., Selmo, E., 2003. Isotopic composition of precipitation in Italy: a first overall map.
J. Hydrol. 270, 75–88) for southern Italy. The groundwater samples analyzed were distributed
essentially along the LMWL. The weighted local meteoric water line (WLMWL),
defined through the mean values weighted by the rainfall amount, however, may define
in a short range the meteoric end-member in the local hydrological cycle more precisely.
Since most of the groundwater sampling locations do not show seasonal variations in their
stable isotope values, the flow system appears to be relatively homogeneous. The mean
altitude of the recharge by rainfall infiltration was estimated on the basis of the local vertical
isotopic gradient d18O. A few springs, which show anomalous isotopic values, reveal
more regional circulation systems, associated with tectonic structures responsible for the
ascent of deeper water.
Description:
Published
Description:
87-97
Description:
1.2. TTC - Sorveglianza geochimica delle aree vulcaniche attive
Description:
JCR Journal
Description:
reserved
Keywords:
stable isotope
;
meteoric recharge
;
01. Atmosphere::01.01. Atmosphere::01.01.99. General or miscellaneous
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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