Mineral composition characteristics and genetic significances of mantle peridotite xenoliths in the North China Craton
Mantle peridotite xenoliths are fragments of the lithospheric mantle which were carried by the mantle-derived magmas in their ascent process.Therefore,they are direct samples of the lithospheric mantle and are known as probes for the deep Earth.They can provide key information for studying the characteristics and evolution of the lithospheric mantle.This article summarizes the rock types,mineral composition characteristics,and genetic significances of mantle peridotite xenoliths in the North China Craton,and points out that the mantle modification by melts(melt-rock reaction)played an important role in the modification process of lithospheric mantle beneath the eastern part of the North China Craton from typically cratonic type to oceanic type.There are a large amount of ancient and refractory residual mantle,as well as relatively young and oceanic-type fertile mantle in the central part and northwestern margin of North China Craton,reflecting the long-term modification of ancient lithospheric mantle by various melts.The melts involved in the mantle modification process were derived from multiple sources including the recycled ancient crust,altered oceanic crust,and oceanic sediments.Further researches should be focused on the timing and stages of the mantle modification and its influencing mechanisms on the lithospheric mantle beneath the North China Craton.
mantle peridotite xenolithmineral compositionmelt-rock interactionLithospheric mantleNorth China Craton
万方数据
维普
