| 延吉地区古新世埃达克岩成因的岩浆混合证据 |
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| 引用本文： | 郭锋,范蔚茗,李超文.延吉地区古新世埃达克岩成因的岩浆混合证据[J].矿物岩石地球化学通报,2011,30(1):1-10. |
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| 作者姓名： | 郭锋 范蔚茗 李超文 |
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| 作者单位： | 中国科学院广州地球化学研究所,广州,510640 |
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| 基金项目： | 国家自然科学基金资助项目(40973024;40673035;90914009) |
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| 摘 要： | 本文通过年代学、矿物学、主量元素、微量元素和同位素的研究,指出延吉地区古新世富镁埃达克岩起源于被俯冲板片熔体交代的地幔楔。单斜辉石和角闪石斑晶所显示的反环带结构为幔源富镁埃达克熔体于壳源中酸性岩浆混合的结果,而非前人普遍认为的熔体—地幔的反应产物;其地球化学特征表现出的岩浆演化趋势可以很好地用地壳混染/AFC过程来解释。延吉古新世埃达克岩形成于俯冲后岩石圈伸展作用背景,与太平洋板块的俯冲后撤作用有关。因此,我们认为富镁埃达克岩的形成不必强调同期洋脊的俯冲作用,只要早先或同时有俯冲板片熔体交代,在合适的p-t条件下交代地幔并发生熔融作用,就能形成这一类岩石。
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| 关 键 词： | 岩浆混合 埃达克岩 古新世 延吉地区 |
Evidence for Magma Mixing in Generation of Paleocene Adakites from the Yanji Area, NE China |
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| GUO Feng,FAN Wei-ming,LI Chao-wen.Evidence for Magma Mixing in Generation of Paleocene Adakites from the Yanji Area, NE China[J].Bulletin of Mineralogy Petrology and Geochemistry,2011,30(1):1-10. |
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| Authors: | GUO Feng FAN Wei-ming LI Chao-wen |
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| Institution: | GUO Feng,FAN Wei-ming,LI Chao-wen Key Laboratory of Marginal Sea Geology,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Wushan,Guangzhou 510640,China |
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| Abstract: | A comprehensive study(including Ar-Ar,zircon U-Pb dating,mineralogy,major,trace element and Sr-Nd-Pb-Hf isotope analyses) on the Paleocene adakites from the Yanji area,NE China is presented in this paper.These adakites have high MgO,Cr and Ni,and extremely high Sr and low Y and HREE.They were considered as melts derived from a slab melt-metasomatized mantle wedge.During ascent they experienced mixing by crustally derived intermediate-felsic magma to interpret the reversely zoned clinopyroxene and amphibole.... |
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| Keywords: | Magma mixing Adakite Paleocene Yanji area |
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