摘要
内蒙古石板井发育有公婆泉组火山岩为一套变质中基性火山岩,主要岩石类型为变质玄武安山岩、变质玄武岩和变质玄武粗安岩,现均已变质为斜长角闪岩。岩石普遍高钠、低钾、低钛,属于钙碱性系列,部分甚至为低钾系列;稀土元素配分模式呈现轻稀土略亏损-近平坦型-轻稀土富集的多种型式,普遍正Ce异;微量元素呈现"三隆起"特点,与火山弧玄武岩相似。火山岩构造环境判别,表明该套火山岩形成于岛弧环境。
There is volcanic rocks of the Gongpoquan formation in Shibanjing, Inner-Mongolia. The following chief conclusion and knowledge have been obtained： the volcanic rocks of the Gongpoquan formation of this study area are mainly composed of basalt. Geochemical characteristics of major elements, rare earth elements and trace elements, and tectonic settings discrimination show that the volcanic rocks are high Sodium, low Kalium and poor Ti, generally belong to tholeiite basalt series-cale-alkalic basalt series with low Kalium. Rare-earth element model takes LREE lightly loss-nearly flat type rare-earth rich of LREE type. There is development of generally positive abnormal Ce. Trace elements shows ＂three apophysis＂. These characteristics similar with volcanic arc basalt. Tectonic envi- ronment analysis showed that the rock have the characteristics VAB.
出处
《科学技术与工程》
北大核心
2015年第17期18-22,共5页
Science Technology and Engineering
关键词
公婆泉组火山岩
岩石学
岩石地球化学
构造环境
volcanic rocks of Gongpoquan formation petrology lithogeochemical tectonic environment
