| 小兴安岭二龙山林场堆晶辉长岩地球化学特征及构造环境 |
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| 引用本文： | 杨乃峰,高波,赵玉林,孙珍军,李超.小兴安岭二龙山林场堆晶辉长岩地球化学特征及构造环境[J].世界地质,2011,30(2):180-185. |
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| 作者姓名： | 杨乃峰 高波 赵玉林 孙珍军 李超 |
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| 作者单位： | 1． 黑龙江省地球物理勘察院，哈尔滨150036 ; 2． 吉林大学地球科学学院，长春130061 |
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| 摘 要： | 小兴安岭北部二龙山林场辉长岩的主量、微量和稀土元素的测试分析结果显示: 二龙山辉长岩为钙碱性系列、偏铝质岩石; δEu 正异常，Sr 元素含量富集明显，具有堆晶辉长岩特征; Rb /Sr、Nb / Ta、LILE/HFSE、Th /Ta、Nb /U 和Nb /La 比值特征均显示，辉长岩岩浆来自受到俯冲流体交代的地幔源区。Nb /Zr、Th /Nb、Th /Ta 和Ta /Hf 比值特征及对Th /Hf --Ta /Hf 构造环境判别图解投点表明，二龙山辉长岩形成于陆内拉张环境。
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| 关 键 词： | 堆晶辉长岩 地球化学特征 构造环境 小兴安岭 |
Geochemical characteristics and tectonic setting of cumulate gabbro in Erlongshan Tree Farm in Xiaoxing'anling |
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| YANG Nai-feng,GAO Bo,ZHAO YU-lin,SUN Zhen-jun,LI Chao.Geochemical characteristics and tectonic setting of cumulate gabbro in Erlongshan Tree Farm in Xiaoxing'anling[J].World Geology,2011,30(2):180-185. |
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| Authors: | YANG Nai-feng GAO Bo ZHAO YU-lin SUN Zhen-jun LI Chao |
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| Institution: | 1． Geophysical Exploration Institute of Heilongjiang Province，Harbin 150036，China; 2． College of Earth Sciences，Jilin University，Changchun 130061，China |
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| Abstract: | The major,trace and REE element testings of the gabbro in Erlongshan Tree Farm in northern Xiaoxing＇anling showed that： the gabbro in the Farm belonged to calc-alkaline series and metaluminous rocks with δEu positive anomaly,and Sr element enriched obviously with the characteristics of cumulate gabbro.The characteristics of Rb/Sr,Nb/Ta,LILE/HFSE,Th/Ta,Nb/U and Nb/La ratios showed that the gabbro magma came from the mantle source metasomatized by subduction fluid.The characteristics of Nb/Zr,Th/Nb,Th/Ta and Ta/Hf ratios and the Th/Hf-Ta/Hf tectonic setting discrimination diagram showed that the gabbro in Erlongshan formed in continental extension environment. |
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| Keywords: | cumulate gabbro geochemical characteristics tectonic environment Xiaoxing'anling |
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