Abstract

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Title:: Melt-peridotite Reactions Within Lithospheric Mantle of North China Craton and Relevant Experiments to This Process Under High-temperature and High-pressure Conditions

Author(s):: CHEN Kang; TANG Hong-feng; 1. Key Laboratory of High-temperature and High-pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, Guizhou, China;2. University of Chinese Academy of Sciences, Beijing 100049, China

Keywords:: experimental petrology; melt-peridotite reaction; experiment under high-temperature and high-pressure conditions; lithospheric mantle; silicate melt; carbonatite melt; North China Craton

Abstract:: It has been concluded that there are melt-peridotite reactions occurring within continental lithospheric mantles from the petrological and geochemical studies on a large number of mantle xenoliths. This case is especially typical in the lithospheric mantle of North China Craton. Based on the mineralogical metasomatic characteristics in mantle xenoliths and the related element geochemical signatures, it is identified that the melt reacted with peridotite within the lithospheric mantle of North China Craton is silicate melt such as in Huinan of Jilin, Nushan of Anhui, Shanwang of Shandong, Hannuoba of Hebei, Jining of Inner Mongolia and Fushan of Hebei, and carbonatite melt such as in Hebi of Henan, Tietonggou of Shandong and Xinyang of Henan. The starting melts used in previous reaction experiments under high-temperature and high-pressure conditions can be also classified into silicate and carbonatite melts. The experimental studies have provided direct evidence for the origin of some special rocks, such as wehrlite, dunite, high-Mg andesite, high-Mg adakite, and for the compositional change in lithospheric mantle. Further experimental study on melt-peridotite reaction under high-temperature and high-pressure conditions, in which the characteristic of run product is correlated with the property and composition of the starting melt, is an important way to reveal lithospheric mantle evolution of North China Craton from ancient refractory to “young” fertile.