An overview on the origin of post-collisional Miocene magmatism in the Kabylies (northern Algeria): Evidence for crustal stacking, delamination and slab detachment

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• 作者：Gilles Chazot^a ; ^{Gilles.Chazot@univ-brest.fr} ; Fatiha Abbassene^a ; ^b ; Ren&eacute ; C. Maury^a ; Jacques D&eacute ; verchè ; re^a ; Herv&eacute ; Bellon^a ; ^c ; Aziouz Ouabadi^b ; Delphine Bosch^d
• 关键词：Calc-alkaline magmas ; Post-collision ; Delamination ; Slab tearing ; Algeria
• 刊名：Journal of African Earth Sciences
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：125
• 期：Complete
• 页码：27-41
• 全文大小：2360 K
• 卷排序：125

文摘

We review geochronological and geochemical features of the Miocene magmatic activity of North Algeria. The peak of magmatic activity occurred at 16–17 Ma with K-rich calc-alkaline plutonic and volcanic rocks. Magmas suffered strong interactions with crustal lithologies. Magmatism relates to Tethyan slab breakoff and partial melting of a previously metasomatized lithospheric mantle. Our model implies crustal stacking, “décollement” of the Kabylian mantle, and delamination of the African mantle.