2004•Bulletin of Mineralogy Petrology and GeochemistryRequires access

Complex Mantle-Crust Interaction in Subduction Zone

Xiaolin Xiong

Abstract

Besides the interaction of fluid derived from the dehydration of subducted slab with the mantle wedge peridotites, the interaction of slab-derived melt with overlying mantle has also been found in the subduction zone. The adakites and associated Nb-enriched basalts and magnesian andesites are the products of interaction of slab-derived melt with mantle peridotites. The interaction of adakitic slab-derived melt with mantle wedge leads to increase of Mg,Nb,Ti,P and Nd/Sr,and decrease of Si,K,Na and La/Yb. Three models have been proposed for the slab melting: 1,subduction of young oceanic slab or oceanic ridge;2,underplating of basaltic magma in lower cruts;3, breaking off or tearing of subducted slab.

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Key concepts: Adakite, Geology, Subduction, Slab, Mantle wedge, Slab window, Underplating, Mantle (geology)