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利用YJ-3000t和JL-3600t多顶砧压力机,以哀牢山造山带南部红河县大白能—乐育剖面上的天然块状斜长角闪岩为初始样品,在950℃、1.0～3.5GPa、恒温20～300h条件下进行了两个系列的斜长角闪岩块状样品脱水部分熔融实验:(1)保持温度T=950℃,加热时间t=100h不变,改变压力(1.0～3.5GPa)的实验;(2)保持温度T=950℃,压力p=3.0GPa不变,改变加热时间(20～300h)的实验。结果表明,1.0～3.5GPa、950℃、恒温100h的条件下,随压力升高,斜长角闪岩中依次生成了单斜辉石+石榴石+熔体的矿物组合(1.0～1.5GPa)和单斜辉石+石榴石+熔体+硬玉+SiO2矿物+蓝晶石(2.0～3.5GPa)的矿物组合。3.0GPa、950℃条件下,随加热时间增加,实验产物中依次生成了单斜辉石+石榴石+熔体+硬玉+SiO2矿物+蓝晶石的矿物组合(20～100h)和单斜辉石+石榴石+熔体的矿物组合(150～300h)。斜长角闪岩的原岩结构决定了实验产物中新生矿物和熔体的分布。依据实验产物的矿物组合和新生矿物的分布特征,讨论了950℃、1.0～3.5GPa、恒温(20～300h)条件下,斜长角闪岩部分熔融过程的结构变化、变质反应以及石榴石冠状体的成因。
Using the YJ-3000t and JL-3600t multiple-head anvil presses, the natural massive amphibolite on the Da-Baine-LeYu Section in Honghe County, southern Ailaoshan, GPa. The dehydration partial melting experiments of two series of amphibolite samples under the condition of constant temperature of 20 ~ 300h were carried out: (1) keeping the temperature at T = 950 ℃, keeping the heating time at 100h, changing the pressure (1.0 ~ 3.5GPa) experiments; (2) to maintain the temperature T = 950 ℃, the pressure p = 3.0GPa unchanged, changing the heating time (20 ~ 300h) experiments. The results show that the mineral assemblages (1.0 ~ 1.5GPa) of clinopyroxene + garnet + melt are formed in the amphibolite under the pressure of 1.0 ~ 3.5GPa, 950 ℃ and constant temperature of 100h. And clinopyroxene + garnet + melt + jade + SiO2 mineral + kyanite (2.0 ~ 3.5GPa) mineral combination. 3.0GPa and 950 ℃, the mineral assemblages (20 ~ 100h) of monoclinic pyroxene + garnet + melt + jadeite + SiO2 + kyanite were formed in the experimental product with the increase of heating time Stone + garnet + melt mineral combination (150 ~ 300h). The protolith structure of plagioclase amphibolite determines the distribution of new minerals and melts in the experimental product. Based on the mineral assemblages and the distribution characteristics of the new minerals, the structural changes, metamorphic reactions and crown-shaped coronal structures of the plagioclase amphibolite under 950 ℃, 1.0 ~ 3.5GPa and 20 ~ 300h are discussed. The causes of the body.