Experimental study on reactions between alkaline basaltic melt and orthopyroxenes:constraints on the evolution of lithospheric mantle in the North China Craton

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外文标题：Experimental study on reactions between alkaline basaltic melt and orthopyroxenes:constraints on the evolution of lithospheric mantle in the North China Craton

外文摘要：The experimental results of the reactions between an alkaline basaltic melt and mantle orthopyrox-enes under high-temperature and high-pressure conditions of 1300-1400 ℃ and 2.0-3.0 GPa using a six-anvil appa-ratus are reported in this paper.The reactions are proposed to simulate the interactions between melts from the asthe-nospheric mantle and the lithospheric mantle.The starting melt in the experiments was made from the alkaline basalt occurring in Fuxin,Liaoning Province,and the orthopyrox-enes were separated from the mantle xenoliths in Damaping,Hebei Province.The results show that clinopyroxenes were formed in all the reactions between the alkaline basaltic melt and orthopyroxenes under the studied P-T conditions.The formation of clinopyroxene in the reaction zone is mainly controlled by dissolution-crystallization,and the chemical compositions of the reacted melt are primarily influenced by the diffusion effect.Temperature is the most important parameter controlling the reactions between the melt and orthopyroxenes,which has a direct impact on the melting of orthopyroxenes and the diffusion of chemical compo-nents in the melt.Temperature also directly controls the chemical compositions of the newly formed clinopyroxenes in the reaction zone and the reacted melt.The formation of clinopyroxenes from the reactions between the alkaline basaltic melt and orthopyroxenes can result in an increase of CaO and Al2O3 contents in the rocks containing this min-eral.Therefore,the reactions between the alkaline basaltic melt from the asthenospheric mantle and orthopyroxenes from the lithospheric mantle can lead to the evolution of lithospheric mantle in the North China Craton from refrac-tory to fertile with relatively high CaO and Al203 contents.In addition,the reacted melts in some runs were transformed from the starting alkaline basaltic into tholeiitic after reac-tions,indicating that tholeiitic magma could be generated from alkaline basaltic one via reactions between the latter and orthopyroxene.

外文关键词：

Alkaline basaltic meltOrthopyroxeneMelt-mineral reactionHigh-temperature and high-pressure experimentGenesis of basaltEvolution of lithospheric mantle in the North China Craton

作者：

Hanqi He、Mingliang Wang、Hongfeng Tang

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作者单位：

Key Laboratory for High Temperature and High Pressure Study of the Earth's Interior,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China

University of Chinese Academy of Sciences,Beijing 100049,China

School of Resource and Civil Engineering,Suzhou University,Suzhou 234000,Anhui,China

关键词：

Alkaline basaltic melt Orthopyroxene Melt-mineral reaction High-temperature and high-pressure experiment Genesis of basalt Evolution of lithospheric mantle in the North China Craton

出版年：

2024

DOI：

10.1007/s11631-023-00671-1

地球化学学报(英文版)

中国科学院地球化学研究所

地球化学学报(英文版)

影响因子：0.33

ISSN：2096-0956

年,卷(期)：2024.43(2)