延边明月沟盆地中生代火山岩深源捕虏体和捕虏晶的发现及矿物化学  

The discovery of deep xenolith and xenocryst in Mesozoic volcanic rock in Mingyuegou Basin of Yanbian area and their mineralogical chemistry

作　　者：王凯红[1] 裴福萍[2] 冯玉生[1] 卢兴波[1] 贾海明[1] 

机构地区：[1]吉林省区域地质矿产调查所,吉林长春130022 [2]吉林大学地球科学学院,吉林长春130061

出　　处：《吉林地质》2005年第2期21-27,共7页Jilin Geology

摘　　要：在延边地区明月沟盆地中侏罗世屯田营组火山岩中发现含有较多的辉石岩捕虏体及单斜辉石和角闪石捕虏晶。单斜辉石相对富含A l2O3、F eO和T iO2,与中国东部新生代玄武岩中单斜辉石巨晶的成分相当。角闪石巨晶的成分明显不同于地幔橄榄岩包体中的韭闪石。从矿物化学所获得的温度-压力计算结果表明:岩浆来源应位于壳幔过渡带。There are more pyroxenite xenolith, clinopyoxene and hornblende xenocryst in the middle Jurassic Tuntianying Formation volcanic rock in the Mingyuegou Basin,Yanbian area. The clinopyroxene contains rich Al2O3, FeO and TiO2which is equivalent to the clinopyroxene giant crystal in Cenozoic basalt in eastern China. The compositions of hornblende are obviously different from pargasite in olivite enclosure in mantle. The calculated results of temperature and pressure from mineralogical chemistry show that magmatic source should lie in crust--mantle intermediate zone.

关 键 词：中侏罗世 捕虏体和捕虏晶 矿物化学 壳幔过渡带 延边地区 

分 类 号：P574.2[天文地球—矿物学]