Ultramafic xenoliths from the Veneto Volcanic Province (Italy): Petrological and geochemical evidence for multiple metasomatism of the SE Alps mantle lithosphere
| Autor: | Mirella Bondi, Patrizia Macera, Delphine Bosch, Lauro Morten, Daniela Gasperini, Roberto Braga |
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| Přispěvatelé: | Universita di Pisa Dip. Scienze Geologiche (UNIV. PISA), University of Pisa - Università di Pisa, Laboratoire de Tectonophysique (Tectonophysique), Centre National de la Recherche Scientifique (CNRS)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut national des sciences de l'Univers (INSU - CNRS), Universita di Bologna, Università di Pisa, Bosch, Delphine, GASPERINI D., BOSCH D., BRAGA R., BONDI M., MACERA P., MORTEN L. |
| Předmět: |
010506 paleontology
Continental collision [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography Geochemistry [SDU.STU.PE] Sciences of the Universe [physics]/Earth Sciences/Petrography 010502 geochemistry & geophysics 01 natural sciences Mantle (geology) [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry Geochemistry and Petrology Ultramafic rock Lithosphere [SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.STU.VO]Sciences of the Universe [physics]/Earth Sciences/Volcanology Xenolith Metasomatism [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment ComputingMilieux_MISCELLANEOUS 0105 earth and related environmental sciences [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Basalt [SDU.OCEAN] Sciences of the Universe [physics]/Ocean Atmosphere Trace element [SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces environment Geophysics [SDU.STU.VO] Sciences of the Universe [physics]/Earth Sciences/Volcanology Geology |
| Zdroj: | HAL Geochemical Journal-Japan Geochemical Journal-Japan-, The Geochemical Society of Japan, 2006, 40 (4), pp.377-404 |
| ISSN: | 0016-7002 |
| Popis: | Ultramafic (mg#>88) xenoliths from the Tertiary Veneto Volcanic Province (SE Alps, Italy) are characterized by variable depletion due to removal of a basaltic component and show significant trace element and isotopic (87Sr/86Sr: 0.703031-0.704356; 143Nd/144Nd: 0.512817-0.513085; 206Pb/204Pb: 18.539-19.694; 207Pb/204Pb: 15.608-15.658; 208Pb/204Pb: 38.412-39.660; δ18O: 6.6-11.2‰) heterogeneity. Variable large-ion lithophile and light rare earth/high field strength element ratios and isotopic compositions occur in samples showing comparable mineralogy and major element content. Petrologic and geochemical characteristics of whole rocks and minerals may be explained by metasomatism of the local mantle lithosphere induced by both alkaline magmas upwelling to the surface (OIB-like mantle diapirism) and interaction with slab-derived material. In comparison with the geochemistry of xenoliths carried by alkaline magmas in typical within-plate tectonic environments, the Veneto xenoliths record a major heterogeneity of the local lithosphere. This appears to be related to a geodynamic scenario that was previously dominated by active continental collision, in which plume-like magmatism subsequently manifested itself. |
| Databáze: | OpenAIRE |
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