摘要
在25kb,1300—1400℃条件下对榴辉岩进行的24次熔融实验研究表明,在25kb时榴辉岩的起始熔融温度为1300℃±,从初熔到完全熔融所需的温度间隔小于100℃;随着熔融程度的增高,熔体中SiO_2,TiO_2,K_2O含量显著降低,Al_2O_3含量略有降低,FeO~*(全铁),MgO,CaO含量明显增加。当熔融 程度小于5％时,熔体成分相当于流纹岩;当熔融程度为10—50％时,熔体成分相当于英安岩-安山岩;当熔融程度大于50％时,熔体成分相当于安山玄武岩-玄武岩。推测环太平洋安山岩线的成因及大陆内部安山岩-玄武岩的形成与地幔榴辉岩的熔融有关。
Study of 24 sequence melting experiments for eclogite at 25kb, 1 300-1 400℃, indicate that melting of eclogite starts at 1 300℃ under 25kb. The temperature interval is less than 100℃ from partial melting to complete melting. With the raising of melting extent, the content of SiQ2, TiO2 and K2O distinctly decrease, while FeO*, MgO and CaO notably increase. When melting extent is less than 5%, the fused mass component is well-matched with andestitic basalt or basalt. We inferred that the formation of andesite line (composition) around the Pacific Ocean and andesite basalt on the continent have relationship with the melting of eclogite.
出处
《海洋科学》
CAS
CSCD
北大核心
1991年第1期39-43,共5页
Marine Sciences
关键词
榴辉岩
熔融
实验
地质意义
Eclogite, Melting experiment, Esite line around the pacific ocean
