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中文摘要：
原始定义的埃达克岩是钠质火成岩,其全岩化学成分相当于英云闪长岩、奥长花岗岩和（富斜长石的）花岗闪长岩（TTG）;而富钾的＂C型埃达克岩＂全岩化学成分相当于（狭义）花岗岩、石英二长岩和（富碱性长石的）花岗闪长岩。现有的失水部分熔融实验岩石学表明,中等富钾程度的贫硅（高Mg#值）玄武质源岩的低比例部分熔融条件下可以形成酸性＂C型埃达克岩＂;玄武质源岩部分熔融不会形成那些SiO2含量中等而又不具备高度富碱特征的＂C型埃达克岩＂。高Sr低Y特征并非判别＂C型埃达克岩＂高压（p≥1.5 GPa）熔融成因的决定性标志,仅仅基于高Sr低Y特征而认为＂C型埃达克岩＂形成于高压熔融的成岩机制是值得商榷的。
英文摘要：
The original defined adakites are sodic igneous rocks,they are tonalite,trondhjemite or（plagioclase-rich） granodiorite in whole-rock chemistry;however,the K-rich ＂C-type adakites＂ defined by Chinese scholars are potassic igneous rocks,they belong to granite（s.s.）,quartz monzonite and（alkali feldspar-rich） granodiorite,etc.The fluid-absent melting experiments indicate that the acid ＂C-type＂ adakite can be generated by low portion melting of the basaltic source-rock that has intermediate potassic and low silicic contents（or high Mg#） under higher pressure.Otherwise,these experiments do not support the assumption that the intermediate ＂C-type＂ adakite,which does not have high alkali contents,is originated from the melting of basaltic source-rock.The characteristics of high Sr and low Y is not a key proxy to indicate the high pressure（p≥1.5 GPa） melting origin of ＂C-type adakites＂.Accordingly,it is not properly to assume the high pressure melting regime for ＂C-type adakites＂ just based on the high Sr and low Y characteristics.
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