1,720,977 research outputs found
Chemical features of the springs and correlations with faults in north-western area of Como Lake basin (Northern Italy)
No full textANALYTICAL ROUTE FOR HYDROGEOLOGICAL ANOMALIES: THE CASE OF A “WHITE” SPRING IN MINE VALLEY (LIVIGNO – ITALY)
No full textThe Livigno area represents a good test for the groundwater system
reconstruction in the mountain environment because it has a complex
geological and tectonical setting. In order to characterize this aquifer, a
multidisciplinary approach, based on lithological, geochemical, hydrogeological
and geo-structural methods, has been adopted.
The Livigno area is located at 1800 m s.l.m. in the central Alps (northern
Lombardy – Italy). For the tectonic setting this area is comprise between the
Err Bernina system (Lower Australpine) and the Ortles-Quatervals system
(Upper Austroalpine). The most important regional fault is represented by
Zebrù fault. This fault divides the sedimentary rocks constituted by Fraele
and Monte Motto limestone (Lias) to crystalline basement, which is
constituted by “Bormio phyllades” and “Punta Rossa Formation”. To the
north of Zebru fault system the Alpisella fault system outcrops and divides
the Monte Motto limestone by Triassic dolomites and limestones.
In the Livigno area 32 springs were sampled and analyzed. In particular, in
the Mine Valley (in the south part of the Livigno area) there is a peculiar
spring, named “White”, which shows a peculiar unknown whitish
deposition.
The first step was to characterize that compound through the integration of
several analytical techniques: XRD, SEM-EDX, FTIR, ICP-MS. Using this
approach we tried to have a complete picture of the problem, also matching
results with hydro-geochemical information. Via the elemental analysis with
EDX was identified the presence of aluminum, sulfur, oxygen and silicon.
Subsequent analysis and bibliographic documentations [1] allowed us to
identify the following structure tridecameric of Na[Al13O4(OH)24(H2O)12]
(SO4)4 x 13H2O, and detect an anomaly in the presence of rare earth
elements (REE) in the whitish compound.
The second step was to analyze closely at Livigno water, which confirmed
this peculiarity in REE in the “White” spring.
[1] I.N. Bhattacharya, P.K. Gochhayat, P.S. Mukherjee, S. Paul, P.K. Mitra,
Materials Chemistry and Physics 88 (2004) 32–40
Characterization of the eve verda in the St.-Marcel valley, Aosta (italian Western Alps)”
No full textRelease and speciation of uranium in low-ionic strength groundwaters at an abandoned uranium mine in Val Vedello (Orobic Alps-Italy) by adsorptive cathodic stripping voltammetry (AdCSV)
No full text
A multivariate approach to the study of the groundwater system in north-western area of Lake Como (Italy)
No full textHydro-geological characterization of the North-Western Lake Como: permeability calculation, hydro geochemistry and correlations with faults
No full text
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
- …
