DOI: 10.1007/s00531-015-1190-2
Scopus记录号: 2-s2.0-84958037526
论文题名: 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)
作者: Cirrincione R. ; Fiannacca P. ; Lustrino M. ; Romano V. ; Tranchina A. ; Villa I.M.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2016
卷: 105, 期: 2 起始页码: 595
结束页码: 609
语种: 英语
英文关键词: Alkali basalts
; Ladinian–Carnian
; Mantle upwelling
; Pangea breakup
; Petrogenesis
; Southern Italy
Scopus关键词: alkali basalt
; asthenosphere
; continental breakup
; continental margin
; crustal contamination
; emplacement
; Hercynian orogeny
; igneous geochemistry
; magmatism
; mantle upwelling
; melting
; neodymium isotope
; petrogenesis
; trace element
; Triassic
; Italy
; North Africa
; Sicily
英文摘要: 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 (Formula presented.) 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. © 2015, Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84958037526&doi=10.1007%2fs00531-015-1190-2&partnerID=40&md5=c62df704447dc2504639cd694b919f4b
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70196
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Università di Catania, Corso Italia, 57, Catania, Italy; CNR – IGAG, c/o Dipartimento di Scienze della Terra, Università degli Studi di Roma La Sapienza, Piazzale Aldo Moro, Rome, Italy; Centro Universitario Datazioni e Archeometria, Università di Milano Bicocca, Milan, Italy; Institut für Geologie, Universität Bern, Baltzerstrasse 3, Bern, Switzerland
Recommended Citation:
Cirrincione R.,Fiannacca P.,Lustrino M.,et al. 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)[J]. International Journal of Earth Sciences,2016-01-01,105(2)