Enriched asthenosphere melting beneath the nascent North African margin: trace element and Nd isotope evidence in middle–late Triassic alkali basalts from central Sicily (Italy)

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• 作者：Rosolino Cirrincione ; Patrizia Fiannacca…
• 关键词：Alkali basalts ; Ladinian–Carnian ; Petrogenesis ; Mantle upwelling ; Pangea breakup ; Southern Italy
• 刊名：International Journal of Earth Sciences
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：105
• 期：2
• 页码：595-609
• 全文大小：3,027 KB
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• 作者单位：Rosolino Cirrincione (1)
  Patrizia Fiannacca (1)
  Michele Lustrino (2)
  Vanessa Romano (1)
  Annunziata Tranchina (1)
  Igor M. Villa (3) (4)
  
  1. Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Università di Catania, Corso Italia, 57, 95129, Catania, Italy
  2. CNR – IGAG, c/o Dipartimento di Scienze della Terra, Università degli Studi di Roma La Sapienza, Piazzale Aldo Moro, 00185, Rome, Italy
  3. Centro Universitario Datazioni e Archeometria, Università di Milano Bicocca, 20126, Milan, Italy
  4. Institut für Geologie, Universität Bern, Baltzerstrasse 3, 3012, Bern, Switzerland
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geology
  Geophysics and Geodesy
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1437-3262

文摘

During the dismembering of the Pangea supercontinent, middle–late Triassic sub-volcanic alkaline rocks were emplaced in central Sicily. These rocks have an alkali basaltic composition and show OIB-like incompatible element patterns in primitive mantle-normalized diagrams (e.g., enrichments in HFSE and LREE coupled with high HFSE/LILE ratios), as well as slightly positive \( \varepsilon_{{{\text{Nd}} }} \) values. Only subtle effects of crustal contamination at shallow depths emerge from geochemical data. These characteristics are very different compared with the Permian calcalkaline magmas from elsewhere in SW Europe still carrying the geochemical signature of modifications related to the Variscan orogeny. The mineralogical, geochemical and isotopic compositions of the investigated samples from central Sicily are also different from the coeval shoshonitic volcano-plutonic formations of Southern Alps (Dolomites). The incompatible element composition and Nd isotopic ratios are consistent with low-degree partial melting of a moderately depleted asthenospheric mantle source, with a negligible involvement of the thinned continental crust. The studied alkaline basalts represent the only known evidence of a segment of the Triassic rift system associated with early Pangea breakup in central Sicily. The close similarity of the central Sicily Triassic alkali basalts with coeval basalts emplaced along former orogenic sutures across the peri-Mediterranean area suggests a common origin related, at least partly, to asthenospheric passive upwelling following the tectonic collapse of the Variscan Belt. These rocks provide new constraints on the spatial–temporal distribution, magma source evolution and geodynamic meaning of the widespread Permo-Triassic basic magmatism developed after the end of the Variscan Orogeny in southwestern Europe. Keywords Alkali basalts Ladinian–Carnian Petrogenesis Mantle upwelling Pangea breakup Southern Italy