| 北祁连牛心山似斑状正长花岗岩LA-ICP-MS锆石U-Pb年龄及其地质意义 |
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| 引用本文： | 张越,李向民,潘峰,宋忠宝.北祁连牛心山似斑状正长花岗岩LA-ICP-MS锆石U-Pb年龄及其地质意义[J].地质通报,2018,37(4):724-733. |
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| 作者姓名： | 张越 李向民 潘峰 宋忠宝 |
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| 作者单位： | 中国地质调查局西安地质调查中心 |
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| 基金项目： | 中国地质调查局项目《祁连成矿带肃南—大柴旦地区地质矿产调查》（编号：DD20160012） |
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| 摘 要： | 青海省祁连县西出露一个似斑状正长花岗岩体,运用LA-ICP-MS方法,对似斑状正长花岗岩中的锆石进行U-Pb同位素分析。测年结果显示,似斑状正长花岗岩的形成年龄为166.6±2.4Ma,表明其形成于燕山期中侏罗世,继承锆石显示前寒武纪源区的时代信息。岩石地球化学特征表明,似斑状正长花岗岩具有高硅、富碱特点,属于过铝质高钾钙碱性岩,具弱负Eu异常,富集Rb、Th、K,亏损Ba、Nb、P、Ti,Rb/Sr值平均为1.86,反映出壳源特点,为S型花岗岩。
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| 关 键 词： | 北祁连造山带 花岗岩 地球化学特征 LA-ICP-MS锆石U-Pb测年 |
| 收稿时间： | 2017/7/7 0:00:00 |
| 修稿时间： | 2018/3/13 0:00:00 |
LA-ICP-MS zircon U-Pb dating of the porphyaceous syenogranite in Niuxinshan along the central segment of North Qilian orogenic belt and its geological significance |
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| ZHANG Yue,LI Xiangmin,PAN Feng and SONG Zhongbao.LA-ICP-MS zircon U-Pb dating of the porphyaceous syenogranite in Niuxinshan along the central segment of North Qilian orogenic belt and its geological significance[J].Geologcal Bulletin OF China,2018,37(4):724-733. |
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| Authors: | ZHANG Yue LI Xiangmin PAN Feng and SONG Zhongbao |
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| Institution: | Xi''an Center of Geological Survey, China Geological Survey, Xi''an 710054, Shaanxi, China,Xi''an Center of Geological Survey, China Geological Survey, Xi''an 710054, Shaanxi, China,Xi''an Center of Geological Survey, China Geological Survey, Xi''an 710054, Shaanxi, China and Xi''an Center of Geological Survey, China Geological Survey, Xi''an 710054, Shaanxi, China |
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| Abstract: | The porphyaceous syenogranite pluton is exposed in the west of Qilian Country, Qinghai Province. The authors conduct-ed LA-ICP-MS zircon U-Pb dating of the porphyaceous syenogranite and the result shows that the age is 166.6±2.4Ma, suggesting the Middle Jurassic of Yanshanian period. Several inheritable magmatic zircons yielded the age information of the Precambrian peri-od. Geochemical data show that the porphyaceous syenogranite is silica-enriched in composition with high content of alkali, and hence it is a peraluminous granite and belongs to the high-K calc-alkaline series. It is characterized by enrichment of Rb, Th, K, de-pletion of Ba, Nb, P, Ti, and weak negative anomaly of Eu, with the average Rb/Sr ratio being 1.86, which reflects the characteris-tics of the crust source and indicates S type granite. |
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| Keywords: | North Qilian orogenic belt granite geochemical characteristics LA-ICP-MS zircon U-Pb dating |
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