藏北羌塘中部果干加年山地区发现榴辉岩  

Discovery of eclogite in the Guoganjianian Mountain, central Qiangtang area, northern Tibet, China

作　　者：董永胜[1] 李才[1] 

机构地区：[1]吉林大学地球科学学院,吉林长春130061

出　　处：《地质通报》2009年第9期1197-1200,共4页Geological Bulletin of China

基　　金：国家自然科学基金项目(编号:40872146;40672187);中国地质调查局项目(编号:1212010818115)资助

摘　　要：果干加年山位于羌塘中部的龙木错-双湖-澜沧江板块缝合带之内,出露有蛇绿岩、晚古生代浅变质岩系等。新近在该区发现了榴辉岩,以透镜体的形式产于石榴子石白云母片岩中,矿物粒度极细,仅为0.05～0.1mm,典型矿物组合为石榴子石+绿辉石+多硅白云母+金红石。初步研究表明,榴辉岩相变质温压条件为470～520℃、2.21～2.51GPa,属于低温型榴辉岩。该榴辉岩的形成过程对探讨龙木错-双湖-澜沧江板块缝合带的构造演化具有重要意义。The ophiolite and late Paleozoic low-grade metamorphic rock series have been found in Guoganjianian Mountain, in Longmucuo-Shuanghu-Langcangjiang suture zone. The eclogite is newly found in this area. It occurs as lenses in garnet-muscovite schist, and mineral grains are very fine, ranging from 0.05 mm to 0.1mm. The eclogite consists of garnet, omphacite, phengite and rutile. Data in this paper indicate that the eclogite was formed under low-temperature condition of 470～520℃ and high-pressure of 2.21 ～2.51GPa. The study on forming process of the eclogite has great significance for the tectonic evolution of Longmucuo - Shuanghu-Langcangjiang suture zone.

关 键 词：榴辉岩 变质作用 龙木错-双湖-澜沧江板块缝合带 果干加年山 羌塘中部 

分 类 号：P588.3[天文地球—岩石学] P588.133[天文地球—地质学]