| 北祁连龙王山晚志留世花岗岩LA-ICP-MS锆石U-Pb测年及其地球化学特征 |
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| 引用本文： | 王国良,叶占福,祁生胜,李杰,刘建栋.北祁连龙王山晚志留世花岗岩LA-ICP-MS锆石U-Pb测年及其地球化学特征[J].矿产与地质,2013(6):462-470,508. |
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| 作者姓名： | 王国良 叶占福 祁生胜 李杰 刘建栋 |
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| 作者单位： | [1]青海省地质调查院,西宁810012 [2]青海省青藏高原北部地质过程与矿产资源重点实验室,西宁810012 |
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| 基金项目： | 中国地质调查局地质调查项目《青海省1：5万玉龙滩、抓什究、贺尔、桥头幅区域地质调查》（项目编号：1212011121192）. 致谢：项目组成员参加了野外调查和研究工作,武汉矿产资源监督检测中心完成所有样品化学成分测试,天津地质矿产研究所完成所有同位素数据测试工作,在此一并表示感谢. |
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| 摘 要： | 通过对龙王山灰白色细粒石英闪长岩和灰白色细粒二长花岗岩样品进行LA-ICP-MS锆石U-Pb测年结果属于晚志留世侵入岩。岩石地球化学特征表明，为高钾过铝质-准铝质碱钙性岩；稀土元素Eu具有弱负异常特征；微量元素中Ta、Nb、gr、Sr、Ti、P相对贫化，Rb、Th、Hf、Ba、Sc、K、Ce、Nd、Sm含量相对富集。Rb／Sr平均值为0．30，介于上地幔值与地壳值之间，反映出壳幔源的特点，为s型花岗岩。综合分析该期花岗岩是弧陆碰撞向陆陆碰撞转化阶段构造背景下形成的同碰撞花岗岩。
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| 关 键 词： | 晚志留世花岗岩 LA-ICP-MS 地球化学特征 北祁连 |
LA-ICP-MS zircon U-Pb dating and geochemical characteristics of late granite in Longwang moutain of northern Qilian |
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| WANG Guo-liang,YE Zhan-fu,QI Sheng-sheng,LI Jie,LIU Jian-dong.LA-ICP-MS zircon U-Pb dating and geochemical characteristics of late granite in Longwang moutain of northern Qilian[J].Mineral Resources and Geology,2013(6):462-470,508. |
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| Authors: | WANG Guo-liang YE Zhan-fu QI Sheng-sheng LI Jie LIU Jian-dong |
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| Institution: | 1. Qinghai Geological Survey Institute, Xining 810012, Qinghai, China ; 2. Qinghai Provincial Key Laboratory of Geological Processes and Mineral Resources of Northern Qinghai-Tibet Plateau, Xining 810012, Qinghai, China) |
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| Abstract: | According to LA-ICP-MS zircon U-Pb dating on samples of linen line-gram quartz alortte ana llIlel1 fine-grain monzonitic granite in Longwang Mountain, they are late Silurian intrusive rocks. Lithogeochemica~ characteristics show that they are high potassic peraluminous -metaluminous alkalic calcic rocks; REE ele ment Eu has characteristics of weak negative anomaly; trace elements of Ta, Nb, Zr, Sr, Ti and P are rela tively depleted, and contents of Rb, Th, Hf, Ba, Sc, K, Ce, Nd and Sm are relatively enriched. The aver age value of Rb/Sr is 0.30, which is between upper mantle value and crustal value. It reflects the character istics of crust-mantle source and it is S type granite. The comprehensive analysis shows that the granites in this phase are syn-collisional granites under the tectonic settings of transferring phase from arc-continent col lision to continent-continent collision. |
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| Keywords: | late Silurian granite LA-ICP-Ms geochemical characteristics northern Qilian |
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