中文摘要：

以产出于大别新店高压变质杂岩带的含角闪石多硅白云母榴辉岩（XD963）为实验源岩,使用YJ-3000t紧装式六面顶压机装置,在2.0GPa,850～1070℃条件下,进行了脱水部分熔融实验研究。结果显示,在850～950℃下,多硅白云母通过不一致脱水熔融反应产生了≤12%的过铝质（铝饱和指数ASI〉1.2）的高K钙碱性（K2O/Na2O=1.2～1.4）花岗质熔体,与其共存的残留相为石榴子石＋绿辉石＋石英＋多硅白云母＋角闪石＋Fe-Ti氧化物＋蓝晶石±金红石。1000～1070℃时,熔体比例陡然增大（〉35%）,成分变为准铝质的钙碱性花岗闪长质,残留相组合以石榴子石＋绿辉石＋普通辉石为主。实验熔体与早白垩世富K埃达克岩的主微量元素对比结果表明：除ASI以及Eu/Eu＊值特征外,低温熔体（900～950℃）与富K埃达克岩具有很好的相似性。此外,本次实验源岩在相对低温（900和950℃）条件下形成的熔体具备富K埃达克岩的两个主要特征—高K钙碱性和花岗质。因此可认为形成高K钙碱性的花岗质岩浆不需要过高的压力以及高度富K的源岩。

英文摘要：

Dehydration melting experiments were conducted on an amphibole-phengite-bearing eclogite sample（XD963）,collected from the Xingdian high pressure metamorphic complex,northern Dabie orogenic belt,using the multianvil apparatus（YJ-3000t） under conditions of 2.0 GPa and 850~1070℃.Phengite-dehydration melting produced ≦12% melt with peraluminous（ASI1.2）,high-potassium,calc-alkaline（K2O/Na2O =1.2~1.4） and granitic features,coexisting with omphacite,garnet,quartz,phengite,amphibole,Fe-Ti oxides and rutile restites up to 950℃ via incongruent melting reactions.at temperatures of 1000~1070℃,the melt fraction abruptly elevated to 35% and became metaluminous,calc-alkaline and granodioritic coexisting with omphacite,augite and garnet-rich restites.The major and trace element compositions of the experimentally produced melts were compared with those of the Early Cretaceous K-rich adakite in Dabie orogenic belt,the results showed that the melts of phengite-bearing eclogite produced by the dehydration melting at relatively low temperatures of 900-950℃ are very similar to the K-rich adakite except significant peraluminous and marginally negative Eu anomalie.Furthermore,the melts produced under temperatures of 900-950℃ are characterized by high-potassium,calc-alkaline and granitic,two critical features of K-rich adakitic rocks.Based on these evidences,it is suggested that high pressure and high K protoliths are not the indispensable requirements for the generation of the high-potassium,calc-alkaline and granitic magma.