Titre:
La terra degli elefanti : atti del 1° congresso internazionale, Roma, 16-20 ottobre 2001 = The world of elephants : proceedings of the 1st international congress / a cura di G. Cavarretta ... [et al.]
Auteur:Cavarretta, G Editeur:
Roma : Consiglio nazionale delle ricerche ;
Date:
[2001]
Collation:
XX, 739 p.
Sujet RERO:Archéozoologie
- Éléphants Sujet RERO - forme:[document électronique] No RERO:
R005027228
Spadoni, M, Voltaggio, M, Cavarretta, G
Journal of geochemical exploration, 2005, Vol.87(3), pp.83-91
[Revue évaluée par les pairs]
ScienceDirect Journals (Elsevier)
Titre: Recognition of areas of anomalous concentration of potentially hazardous elements by means of a subcatchment-based discriminant analysis of stream sediments Auteur:Spadoni, M; Voltaggio, M; Cavarretta, G Sujet:Stream Sediments ; Discriminant Analysis ; Information Coefficient ; Geochemical Mapping ; Stream Sediments ; Discriminant Analysis ; Information Coefficient ; Geochemical Mapping ; Engineering Description:
The statistical technique of discriminant analysis associated with the calculation of an information coefficient has been applied to the concentrations of 37 chemical elements for calculating the mixing of stream sediments of different origin in the Mignone river basin. Discriminant analysis has been based on sample catchment basins (SCBs), defined as the part of the drainage basin between two consecutive sampling points along the same stream branch, and on the identification of 4 different litho-geochemical groups. This approach, has been used to define the membership probability values for every sample by applying Bayes' rule and calculating posterior probability. The grade of uncertainty for each group assignment has been evaluated by using an information coefficient, based on a classification entropy index, and running a procedure analogue to that used for processing membership values in fuzzy analysis. The maximum theoretical concentration...
Fait partie de:
Journal of geochemical exploration, 2005, Vol.87(3), pp.83-91
Identifiant:
0375-6742 (ISSN); 1879-1689 (E-ISSN); 10.1016/j.gexplo.2005.08.001 (DOI)
Gaeta, M, Fabrizio, G, Cavarretta, G
Journal of volcanology and geothermal research, 2000, Vol.99(1), pp.179-193
[Revue évaluée par les pairs]
ScienceDirect Journals (Elsevier)
Titre: F-phlogopites in the Alban Hills Volcanic District (Central Italy): indications regarding the role of volatiles in magmatic crystallisation Auteur:Gaeta, M; Fabrizio, G; Cavarretta, G Sujet:Phlogopite ; Fluorine ; Ultrapotassic Rocks ; Alban Hills Volcanic District ; Phlogopite ; Fluorine ; Ultrapotassic Rocks ; Alban Hills Volcanic District ; Geology Description:
A systematic analysis of micas contained in effusive, pyroclastic and hypabyssal rocks of the Alban Hills Volcanic District (AHVD) (Central Italy) was made in order to characterise minerals of pyroclastic units for tephrostratigraphy and to obtain as much information as possible on the activity of volatiles in this magmatic system. The phlogopite shows a large range of F contents (between 0.50 and 7.50 wt%) that make it possible to discriminate different AHVD lithologies; in particular, micas of lava groundmass are characterised by extremely high F (up to 7.50 wt%) and Ba (up to 9.70 wt%) contents, seldom or never found in other magmatic ultrapotassic rocks. Moreover, the micas of pyroclastics, ultramafic cumulates and holocrystalline inclusions made up of leucite, clinopyroxene and phlogopite (hereafter italites) show Mg/(Mg+Fe) values between 0.65 and 0.90 that are not correlated with F contents. The variations in F contents observed in the AHVD micas do not appear...
Fait partie de:
Journal of volcanology and geothermal research, 2000, Vol.99(1), pp.179-193
Identifiant:
0377-0273 (ISSN); 1872-6097 (E-ISSN); 10.1016/S0377-0273(00)00172-4 (DOI)
Marra, F., Freda, C., Scarlato, P., Taddeucci, J., Karner, D., Renne, P., Gaeta, M., Palladino, D., Trigila, R., Cavarretta, G.
Bulletin of Volcanology, 2003, Vol.65(4), pp.227-247
[Revue évaluée par les pairs]
Springer Science & Business Media B.V.
Titre: Post-caldera activity in the Alban Hills volcanic district (Italy): 40 Ar/ 39 Ar geochronology and insights into magma evolution Auteur:Marra, F.; Freda, C.; Scarlato, P.; Taddeucci, J.; Karner, D.; Renne, P.; Gaeta, M.; Palladino, D.; Trigila, R.; Cavarretta, G. Sujet:Alban Hills ; Ar/Ar geochronology ; Hydromagmatic eruptions ; K-alkaline magmas ; Petrology Description:
We present 24 40 Ar/ 39 Ar ages for the youngest volcanic products from the Alban Hills volcanic district (Rome). Combined with petrological data on these products, we have attempted to define the chronology of the most recent phase of activity and to investigate the magma evolution of this volcanic district. The early, mainly explosive activity of the Alban Hills spanned the interval from 561±1 to 351±3 ka. After approximately 50-kyr of dormancy, a mainly effusive phase of activity took place, accompanied by the strombolian activity of a small central edifice (Monte delle Faete). This second phase of activity spanned the interval 308±2 to 250±1 ka. After another dormancy period of approximately 50-kyr, a new, hydromagmatic phase of activity started at 200 ka at several centers located to the southwest of the Monte delle Faete edifice. After an initial recurrence period of approximately 50-kyr, which also characterized this new phase of activity, the longest dormancy period (approximately 80-kyr) in the history of the volcanic district preceded the start of the activity of the Albano and Giuturna centers at 70±1 ka. Results of our study suggest a quasi-continuous magmatic activity feeding hydromagmatic centers with a new acme of volcanism since around 70 ka. Based on data presented in this paper, we argue that the Alban Hills should not be considered an extinct volcanic district and a detailed re-assessment of the volcanic hazard for the area of Rome is in order.
Fait partie de:
Bulletin of Volcanology, 2003, Vol.65(4), pp.227-247
Identifiant:
0258-8900 (ISSN); 1432-0819 (E-ISSN); 10.1007/s00445-002-0255-9 (DOI)