Age, origin and geodynamic significance of plagiogranites in lherzolites and gabbros of the Piedmont-Ligurian ocean basin

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• 作者：Borsi ; Laura ; Schä ; rer ; Urs ; Gaggero ; Laura ; Crispini ; Laura
• 关键词：Ligurian Alps ; Northern Apennines ; plagiogranites ; U/Pb ; Sm/Nd ; geochemistry
• 刊名：Earth and Planetary Science Letters
• 出版年：1996
• 出版时间：May, 1996
• 年：1996
• 卷：140
• 期：1-4
• 页码：227-241
• 全文大小：1.29 M

文摘

U-Pb zircon dating, Sr-Nd isotope tracing and major/trace/RE element analyses were performed to constrain the age, origin and geodynamic significance of plagiogranites that intrude lherzolites and gabbros in the Ligurian Alps and the Northern Apennines. In addition, a host Fe-diorite was investigated. Samples from the Ligurian Alps were collected from the Voltri Group and the Sestri-Voltaggio Zone, whereas the plagiogranites from the Northern Apennines were taken in the Bracco unit. All these units have been affected by Alpine metamorphism reaching eclogite facies in the Voltri Group, blueschist degree in the Sestri Voltaggio samples, and prehnite-pumpellyite facies in the Bracco Unit, which has additionally been affected by rodingitization.