Reaction experiments between tonalitic melt and mantle olivine and their implications for genesis of high-Mg andesites within cratons  

作　　者：WANG MingLiang TANG HongFeng 

机构地区：[1]Laboratory for High Temperature & High Pressure Study of the Earth's Interior,Institute of Geochemistry, Chinese Academy of Sciences [2]University of Chinese Academy of Sciences

出　　处：《Science China Earth Sciences》2013年第11期1918-1925,共8页中国科学（地球科学英文版）

基　　金：supported by the Knowledge Innovation Program of the Chinese Academy of Sciences(Grant No.KZCX2-YW-Q08-3-4);the project from the State Key Laboratory for Mineral Deposits Research,Nanjing University(Grant No.15-09-08)

摘　　要：High-Mg （Mg#〉45） andesites （HMA） within cratons attract great attention from geologists. Their origin remains strongly debated. In order to examine and provide direct evidence for previous assumptions about HMA＇s genesis inferred from petrolog- ical and geochemical investigations, we performed reaction experiments between tonalitic melt and mantle olivine on a six-anvil apparatus at high-temperature of 1250-1400℃ and high-pressure of 2.0-5.0 GPa. Our experiments in this work simulated the interaction between the tonalitic melt derived from partial melting of eclogitized lower crust foundering into the Earth＇s mantle and mantle peridotite. The experimental results show that the reacted melts have very similar variations in chemical compositions to the HMAs within the North China Craton. Therefore, this interaction is probably an important pro- cess to generate the HMAs within crations.High-Mg(Mg#>45)andesites(HMA)within cratons attract great attention from geologists.Their origin remains strongly debated.In order to examine and provide direct evidence for previous assumptions about HMA’s genesis inferred from petrological and geochemical investigations,we performed reaction experiments between tonalitic melt and mantle olivine on a six-anvil apparatus at high-temperature of 1250–1400°C and high-pressure of 2.0–5.0 GPa.Our experiments in this work simulated the interaction between the tonalitic melt derived from partial melting of eclogitized lower crust foundering into the Earth’s mantle and mantle peridotite.The experimental results show that the reacted melts have very similar variations in chemical compositions to the HMAs within the North China Craton.Therefore,this interaction is probably an important process to generate the HMAs within crations.

关 键 词：tonalitic melt mantle olivine melt-mineral reaction experiment high-Mg andesite CRATON 

分 类 号：P589.1[天文地球—岩石学]