Samuele Agostini
University of Pisa
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Featured researches published by Samuele Agostini.
Lithos | 2001
Massimo D'Orazio; Samuele Agostini; F. Innocenti; Miguel J. Haller; Piero Manetti; Francesco Mazzarini
Abstract The Estancia Glencross Area (EGA) volcanic rocks form a series of five isolated buttes located at the southern end (∼52°S) of the discontinuous belt of Cenozoic basaltic lava formations occurring in the extra-Andean Patagonia. EGA volcanics are subalkaline basalts and basaltic andesites erupted at 8.0–8.5 Ma in a region closely behind the Andean Cordillera. EGA volcanism predated by about 4–5 my the onset of the volcanism in the nearby Pali Aike Volcanic Field, which produced highly primitive, alkaline lavas. Incompatible trace-element distributions and Sr–Nd isotope compositions of EGA rocks are those typical of within-plate OIB-type basalts and are indicative of minimal interaction of sub-lithospheric magmas with enriched reservoirs. The geochemical characteristics of EGA volcanics, as well as their age and location are consistent with a model of slab window opening beneath this region. The high silica content and the garnet signature of the estimated EGA primary magma are explained by a two-stage process involving the initial production of melts from a garnet lherzolite source followed by the reaction of these melts with harzburgite country rocks during their ascent through the mantle lithosphere. The melt/harzburgite reaction, favoured by a slow melt ascent rate, as well as the low magma production at EGA, are likely related to the dominantly compressive stress regime operating in this area during Late Miocene.
Developments in Volcanology | 2005
Samuele Agostini; Carlo Doglioni; Fabrizio Innocenti; P. Manetti; M.Y. Savaşçin; S. Tonarmi
Abstract Scattered Late Miocene high-Mg basaltic andesites to dacites can be found in Western Anatolia. These rocks display Mg#>65, high CaO/Al2O3 ratio, low alkalies and TiO2 contents. Trace element distribution shows typical orogenic signature with higher values of Fluid Mobile Elements and lower values of HREE and HFSE with respect to Early Miocene Western Anatolia calc-alkaline rocks. The 87 Sr/ 86 Sr and 143 Nd/ 144 Nd ratios virtually overlap the values of the less evolved calc-alkaline rocks. The variations observed in this association have been attributed to an FC process combined with interaction with crustal material. A thermal anomaly affecting a depleted mantle source has been invoked for the genesis of these products. Such an anomaly was produced by the ascent of deep sub-slab mantle, which replaced the underthrust lithosphere, already thinned and stretched by extensional process.
Tectonophysics | 2000
Massimo D'Orazio; Samuele Agostini; Francesco Mazzarini; Fabrizio Innocenti; Piero Manetti; Miguel J. Haller; Alfredo Lahsen
Journal of The Virtual Explorer | 2002
Carlo Doglioni; Samuele Agostini; Mattia Crespi; Fabrizio Innocenti; Piero Manetti; Federica Riguzzi; Y. Savasci
Earth and Planetary Science Letters | 2008
Samuele Agostini; Jeffrey G. Ryan; Sonia Tonarini; Fabrizio Innocenti
Tectonophysics | 2010
Samuele Agostini; Carlo Doglioni; Fabrizio Innocenti; Piero Manetti; Sonia Tonarini
Geochemistry Geophysics Geosystems | 2007
Sonia Tonarini; Samuele Agostini; Carlo Doglioni; Fabrizio Innocenti; Piero Manetti
Special Paper of the Geological Society of America | 2007
Samuele Agostini; Carlo Doglioni; Fabrizio Innocenti; Piero Manetti; Sonia Tonarini; M. Yılmaz Savaşçin
Terra Nova | 2005
Sonia Tonarini; Samuele Agostini; Fabrizio Innocenti; Piero Manetti
Geothermics | 2006
Samuele Agostini; Giacomo Corti; Carlo Doglioni; Eugenio Carminati; Fabrizio Innocenti; Sonia Tonarini; Piero Manetti; Gianfranco Di Vincenzo; Domenico Montanari