| 埃达克岩的研究现状及其趋势 |
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| 引用本文： | 武占祖,陈勇,梁旭辉.埃达克岩的研究现状及其趋势[J].地质找矿论丛,2005,20(3):204-208. |
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| 作者姓名： | 武占祖 陈勇 梁旭辉 |
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| 作者单位： | 中国地质大学,资源管理系,武汉,430074;甘肃有色地质勘查局一○六队,兰州,730047;西部矿业股份有限公司,西宁,810000;中国地质大学,资源管理系,武汉,430074 |
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| 摘 要： | 达克岩(adakite)是一种中酸性富钠火成岩(安山岩、英安岩、钠质流纹岩及相应的侵入岩),其突出的地球化学特征就是SiO2≥56%,Al2O3≥15%,低重稀土元素(HREE)与Y(如Yb≤1.9×10-6,Y≤18×10-6),高Sr(大多数>400×10-6,La/Yb(≥10.0)与Sr/Y(>20.0～40.0),一般具有正铕异常(少数具有极弱负铕异常).埃达克岩存在两种成因类型:一种由俯冲的年轻(≤25～30Ma)大洋板片熔融形成(O型埃达克岩);另一种由增厚地壳环境中的玄武质下地壳熔融形成(C型埃达克岩).文章从埃达克岩的特征、形成机制、成矿作用、构造背景、动力学意义等几个方面论述了埃达克岩的研究现状,并指出了未来埃达克岩研究的趋势.
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| 关 键 词： | 埃达克岩 成因类型 板片俯冲 地球动力学意义 |
| 文章编号： | 1001-1412（2005）03-0204-05 |
| 收稿时间： | 2004-06-01 |
| 修稿时间： | 2004-09-28 |
THE CURRENT SITUATION AND TENDENCY OF RESEARCH ON ADAKITE |
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| WU Zhang-zu,CHENG Yong and LIANG Xu-hui.THE CURRENT SITUATION AND TENDENCY OF RESEARCH ON ADAKITE[J].Contributions to Geology and Mineral Resources Research,2005,20(3):204-208. |
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| Authors: | WU Zhang-zu CHENG Yong and LIANG Xu-hui |
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| Institution: | China University of Geoscionces, Wuhan 430074, China;No.106 Team Gansu Non-ferrous Metal Geological prospecting Bureau, Lanzhou 730046, China;Western region mineral industry company, Xining 810000, China;China University of Geoscionces, Wuhan 430074, China |
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| Abstract: | Adakite is a kind of intermediate and acid igneous Na-rich rock(andesite, dacite, sodium rhyolite and homologous intrusive rock ) with striking characteristics of SiO2≥56%,Al2O3≥15%,depletion in HREE and Y(Yb≤1.9×10-6,Y≤18×10-6),high Sr(>400×10-6, rarely<400×10-6),La/Yb(≥10.0)and Sr/Y(>20.0-40.0),as well as positive Euranomaly and rare very weak negative Eu aomaly. There are two types of adakites with different petrogenesis:one type is formed by the melting of(≤25-30Ma) subdcted slab(O-type adakite), and the other type is formed by the melting of basaltic lower crust under thickened setting(C-type adakite). The article primarily dicusses the currtent situation on Adakite from the characteristics, mechanism, ore formation, structure background, geodynamics etc. It points out tendency of research on Adakite. |
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| Keywords: | adakite petrogenesis types subducting slab geodynamics |
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