| 甘肃北山地区骆驼山镁铁--超镁铁岩体岩石成因 |
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| 引用本文： | 张江江,钱壮志,孙 涛,姜 超,王若梅,杨素红.甘肃北山地区骆驼山镁铁--超镁铁岩体岩石成因[J].世界地质,2014,33(1):11-25. |
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| 作者姓名： | 张江江 钱壮志 孙 涛 姜 超 王若梅 杨素红 |
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| 作者单位： | 1. 长安大学 地球科学与资源学院，西安 710054; 2. 西部矿产资源与地质工程教育部重点实验室，西安 710054; 3. 中国地质科学院矿产资源研究所 国土资源部成矿作用与资源评价重点实验室，北京 100037 |
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| 基金项目： | 中国地质调查局地质大调查项目（1212011085061）,国家自然科学基金项目（41372101）,中国博士后科学基金项目（2013M541001）联合资助. |
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| 摘 要： | 骆驼山镁铁--超镁铁岩体主要岩石类型有单辉橄长岩、橄榄辉长苏长岩、橄长岩、辉长苏长岩、辉长岩。橄榄石Fo为76~83,为贵橄榄石。辉石化学特征以及主量元素特征表明其属拉斑玄武岩系列,稀土元素配分曲线总体表现为轻稀土稍富集、重稀土微分异的特征。微量元素具有大离子亲石元素(Rb、Ba、Sr)相对富集,高场强元素Ta、Hf、Th相对亏损的特征。岩浆演化过程中分离结晶作用主要受单斜辉石控制。Nb/U、Ce/Pb值更接近于地壳值以及敏感元素比值协变关系表明岩浆演化过程发生了同化混染作用。Th/Yb-Nb/Yb、La/Ba-La/Nb之间的关系指示岩浆源区可能为流体交代改造的富集型岩石圈地幔。
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| 关 键 词： | 地壳混染 岩浆源区 镁铁质--超镁铁质岩体 北山地区 甘肃 |
Petrogenesis of Luotuoshan mafic-ultramafic intrusions in Beishan area,Gansu |
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| ZHANG Jiang-jiang,QIAN Zhuang-zhi,SUN Tao,JIANG Chao,WANG Ruo-mei,YANG Su-hong.Petrogenesis of Luotuoshan mafic-ultramafic intrusions in Beishan area,Gansu[J].World Geology,2014,33(1):11-25. |
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| Authors: | ZHANG Jiang-jiang QIAN Zhuang-zhi SUN Tao JIANG Chao WANG Ruo-mei YANG Su-hong |
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| Institution: | 1. College of Earth Science and Ｒesources，Chang'an University，Xi'an 710054，China; 2. Key Laboratory of Western China's Mineral Ｒesources and Geological Engineering，Ministry of Education，Xi'an 710054，China; 3. MＲL Key Laboratory of Metallogeny and Mineral Assessment，Institute of Mineral Ｒesources，Chinese Academy of Geological Sciences，Beijing 100037，China |
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| Abstract: | The major rock types of Luotuoshan mafic-ultramafic intrusions are clinopyroxene troctolite,olive gabbro norite,troctolite,gabbro-norite and gabbro.The value of olivine Fo is 76 ～ 83,indicating the peridot in lithology.The chemical characteristics of pyroxene and major elements indicate that the intrutions belong to the tholeiitic series.The distribution curve of REE shows enrichment of LREE and slight variation of HREE.Trace elements are enriched in LILE （e.g.Rb,Ba and Sr） and loss of HFSE （e.g.Ta,Hf and Th）.The fractional crystallization in magmatic evolution is mainly controlled by clinopyroxene.The values of Nb/U and Ce/Pb are close to the Earth＇s crust and sensitive element ratio covariance relationship.It indicates that assimilation took place during magmatic evolution.The plots of Th/Yb versus Nb/Yb and La/Ba versus La/Nb imply that magmatic source may be the enriched lithosphere mantle modified by subduction fluid. |
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| Keywords: | crustal contamination magmatic source mafic-ultramafic intrusions Beishan area Gansu |
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