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塔源地区变辉长岩岩石化学地球化学特征及成因
引用本文:钟辉,傅俊彧.塔源地区变辉长岩岩石化学地球化学特征及成因[J].地质与资源,2006,15(1):42-47.
作者姓名:钟辉  傅俊彧
作者单位:沈阳地质矿产研究所, 辽宁沈阳 110033
摘    要:塔源地区变辉长岩岩石化学主要表现为碱性玄武岩系列特征,但Al2O3含量多大于16%,又表现为钙碱性高铝玄武岩的特征.不活动元素投图,样品进入大洋岛碱性玄武岩区.稀土元素及微量元素地球化学型式均表现为富集型,与作为现代E型富集地幔的代表——亚速尔台地的玄武岩特征相似,但Nb、Ta的亏损又类似岛弧火山岩的特征.综合分析塔源地区地质与构造特征,认为塔源变质辉长岩形成于边缘海环境,其源区为E1型富集地幔.

关 键 词:塔源  变辉长岩  洋岛碱性玄武岩  E1型富集地幔  
文章编号:1671-1947(2006)01-0042-06
收稿时间:2005-11-24
修稿时间:2005-12-28

PETROCHEMISTRY, GEOCHEMISTRY AND GENESIS OF THE META-GABBRO IN TAYUAN, NORTHERN DAXINGANLING
ZHONG Hui,FU Jun-yu.PETROCHEMISTRY, GEOCHEMISTRY AND GENESIS OF THE META-GABBRO IN TAYUAN, NORTHERN DAXINGANLING[J].Geology and Resources,2006,15(1):42-47.
Authors:ZHONG Hui  FU Jun-yu
Institution:Shenyang Institute of Geology and Mineral Resources, Shenyang 110033, China
Abstract:The genesis of the meta-gabbro occurring in Tayuan area is disc us sed on the basis of petrochemical and geochemical data. The petrochemistry of Ta yuan meta-gabbro expresses the characteristics of alkali series of basalt. How ever, the content of Al2O3 in most rock samples is higher than 16% , indicating the characteristics of high-Al2O3 basalt of calc-alkaline series. In the di agram showing the tectonic environments with inactive element contents, all the samples are dropped in OIA area. The REE and trace element distribution patterns of Tayuan meta-gabbro show enrichment of LREE and incompatible elements, whic h is similar to the character of basalt in Azores platform as the modern E-typ e of enriched mantle. The deficiency of Nb and Ta, however,suggests its island- arc background. Analysis on the geology and tectonics in the area shows that Ta yuan meta-gabbro was formed in marginal sea, as the deep-member of ocean isl and, derived from E1-type of mantle source.
Keywords:meta-gabbro  ocean island basalt  E1-type of mantle  Tayuan ar ea
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