Silica-enriched mantle sources of subalkaline picrite-boninite-andesite island arc magmas

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• 作者：A. Bé ; nard^a ; ^b ; ^{antoine.benard@anu.edu.au} ; ^{antoine.benard@monash.edu} ; R.J. Arculus^a ; O. Nebel^b ; D.A. Ionov^c ; S.R.B. McAlpine^a
• 关键词：Silica enrichment ; Peridotite ; Subduction ; Primary melt ; Picrite ; Boninite
• 刊名：Geochimica et Cosmochimica Acta
• 出版年：2017
• 出版时间：15 February 2017
• 年：2017
• 卷：199
• 期：Complete
• 页码：287-303
• 全文大小：1324 K
• 卷排序：199

文摘

Mantle-derived peridotites in islands arcs are distinctively rich in orthopyroxene. Arc peridotites are residues from partial melting of ‘hybrid mantle wedge’ lithologies. Silica-rich and magnesian primary melts are formed from these hybrid protoliths. Silica-rich picrite and high-Ca boninite are cryptic components in arcs. Silica enrichment in primary arc melts is critical in formation of continental crust.