苏胶地体碱质闪石柯石英榴辉岩的意义  

SIGNIFICATION OF COESITE-ECLOGITES WITH ALKALI-AMPHIBOLES FROM THE SU-JIAO TERRAIN

作　　者：亓润章[1] 郑济林[1] 钱雪明[1] 

机构地区：[1]南京地质矿产研究所,210016

出　　处：《火山地质与矿产》1994年第4期53-61,共9页Volcanology & Mineral Resources

基　　金：江苏省自然科学基金

摘　　要：苏胶地体碱质闪石柯石英榴辉岩有两类：含碱质闪石（蓝闪石）黝帘石榴辉岩和含兰晶石碱质闪石榴辉岩．在这两类岩石的石榴石和辉石中均能见到柯石英残晶或其假象。估算其温压条件，温度为750－980℃、压力28．5～31．5×108pa；推测它们的形成是苏胶地体发生、发展、定位的终结产物。Coesite-eclogites with alkali-amphibole in the Su-Jiao Terrain can be divided into two types: alkali-amphibole-bearing zoisite and kyanite-bearing alkali-amphibole eclogites. These types of eclogites have coesite relicts or pseudomorphes. By use uf geobarometers and geothermometers, the P-T conditions have been estimated as follows: 750- 980℃ in temperature and 28. 5 - 31.5 ×108pa in pressure. It may be inferred from the data in this paper that the formation of the eclogites was refated to the subduction-uplift between the North China with Yangtze Paleoblocks.

关 键 词：碱质闪石 榴辉岩 苏胶地体 柯石英 

分 类 号：P588.3[天文地球—岩石学]