Slab-derived and above-slab Late Cenozoic melts from convergent boundary zones of Asia and East Hangay, Central Mongolia
Seismic structure of the upper mantle in Asia exhibits high-velocity slabs and above-slab low-velocity anomalies. Geochemical heterogeneity of mantle sources for magmatism is suggested to result from melting depleted slab-derived and enriched above-slab material. Complementary trends of liquids formed in zones of convergent boundaries of Asia are defined. Different trends of melts from such zones and Hawaiian hotspot are distinguished. Late Cenozoic magmatism in East Hangay is inferred to be produced firstly in slab-derived sources and then in above-slab ones due to development of postcollisional processes similar to those operated at Indo-Asian convergent zone.