辉长岩的高压部分熔融实验研究

An Experimental Study on Partial Melting of Gabbro at High Pressure

利用天然含水辉长岩在１．５～３．０ＧＰａ，９００℃～１４４０℃条件下进行了高温高压部分熔融实验，系统地分析了辉长岩部分熔融后实验产物的岩石学、矿物学、地球化学特征。获得了１）辉长岩的高压熔融曲线，２）辉长岩在不同压力下熔融时，残留相矿物组合及期间矿物相转变与熔融液相成分（相当于安山岩浆）特征。认识了辉长岩与榴辉岩相间的相变关系；辉长岩－榴辉岩－安山岩之间的内在联系以及高温榴辉岩的可能成因。

The partial melting experiments of gabbro from Hanshan were carried out at various pressures from 1 5 to 3 0GPa and temperatures from 900 to 1400℃,using a YJ 3000t press fitting with a wedge type cubic anvil for all experiments. The characteristics of petrology, mineralogy and geochemistry on products of partial melting of gabbro, including the curve of heating melting at high pressure, mineral phase of residual (20￣2 5GPa:Pl+Aug+Mt, 25￣2 75GPa: Pl+Omp+Grt+Q+Mt, >2 75GPa:Grt+Omp+Q+Ilm) and composition of minerals and glass were systemtically analyzed. At last,the interrelation among gabbro,eclogite and andesite and the possible genesis of the high temperature eclogite were realized.