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Dive into the research topics where Samuele Agostini is active.

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Featured researches published by Samuele Agostini.


Lithos | 2001

Slab window-related magmatism from southernmost South America: the Late Miocene mafic volcanics from the Estancia Glencross Area (∼52°S, Argentina–Chile)

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

Tertiary high-Mg volcanic rocks from Western Anatolia and their geodynamic significance for the evolution of the Aegean area

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

The Pali Aike Volcanic Field, Patagonia: slab-window magmatism near the tip of South America

Massimo D'Orazio; Samuele Agostini; Francesco Mazzarini; Fabrizio Innocenti; Piero Manetti; Miguel J. Haller; Alfredo Lahsen


Journal of The Virtual Explorer | 2002

On the extension in western Anatolia and the Aegean sea

Carlo Doglioni; Samuele Agostini; Mattia Crespi; Fabrizio Innocenti; Piero Manetti; Federica Riguzzi; Y. Savasci


Earth and Planetary Science Letters | 2008

Drying and dying of a subducted slab: Coupled Li and B isotope variations in Western Anatolia Cenozoic Volcanism

Samuele Agostini; Jeffrey G. Ryan; Sonia Tonarini; Fabrizio Innocenti


Tectonophysics | 2010

On the geodynamics of the Aegean rift

Samuele Agostini; Carlo Doglioni; Fabrizio Innocenti; Piero Manetti; Sonia Tonarini


Geochemistry Geophysics Geosystems | 2007

Evidence for serpentinite fluid in convergent margin systems: The example of El Salvador (Central America) arc lavas

Sonia Tonarini; Samuele Agostini; Carlo Doglioni; Fabrizio Innocenti; Piero Manetti


Special Paper of the Geological Society of America | 2007

The transition from subduction-related to intraplate Neogene magmatism in the Western Anatolia and Aegean area

Samuele Agostini; Carlo Doglioni; Fabrizio Innocenti; Piero Manetti; Sonia Tonarini; M. Yılmaz Savaşçin


Terra Nova | 2005

δ11B as tracer of slab dehydration and mantle evolution in Western Anatolia Cenozoic Magmatism

Sonia Tonarini; Samuele Agostini; Fabrizio Innocenti; Piero Manetti


Geothermics | 2006

Tectonic and magmatic evolution of the active volcanic front in El Salvador: insight into the Berlín and Ahuachapán geothermal areas

Samuele Agostini; Giacomo Corti; Carlo Doglioni; Eugenio Carminati; Fabrizio Innocenti; Sonia Tonarini; Piero Manetti; Gianfranco Di Vincenzo; Domenico Montanari

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Carlo Doglioni

Sapienza University of Rome

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Michele Lustrino

Sapienza University of Rome

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Lorenzo Fedele

University of Naples Federico II

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Giacomo Corti

National Research Council

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Eugenio Carminati

Sapienza University of Rome

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