| 黑龙江多宝山地区大岔子正长花岗岩锆石U-Pb年龄及其地质意义 |
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| 引用本文： | 代宇,刘江领,刘旭光,王建民.黑龙江多宝山地区大岔子正长花岗岩锆石U-Pb年龄及其地质意义[J].地质与资源,2012,21(2):188-193. |
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| 作者姓名： | 代宇 刘江领 刘旭光 王建民 |
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| 作者单位： | 1. 黑龙江地质调查研究院, 黑龙江 哈尔滨 150000;2. 陕西中核资源有限公司, 陕西 西安 710077 |
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| 摘 要： | 为查明出露于黑龙江多宝山地区大岔子正长花岗岩体的时代和形成的地质背景，对其进行了锆石SHRIMP U-Pb同位素地质年代学研究.结果显示该锆石具有明显环带结构，Th/U比值为0.41~0.99，是典型的岩浆型锆石.大岔子正长花岗岩锆石共分析了11个测点，206Pb/238U加权平均年龄为345±3 Ma（n=11，SMWD=0.99）.该年龄代表了正长花岗岩的结晶年龄，表明正长花岗岩形成时代为早石炭世.对正长花岗岩的主量元素及微量元素的分析表明，该花岗岩属于富钾钙碱性花岗岩类，成因类型属于A型花岗岩.
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| 关 键 词： | 正长花岗岩 SHRIMP锆石U-Pb定年 早石炭世花岗岩 岩石地球化学 多宝山地区 黑龙江省 |
| 收稿时间： | 2011-10-31 |
ZIRCON U-Pb AGE OF THE DACHAZI SYENOGRANITE IN DUOBAOSHAN AREA,HEILONGJIANG PROVINCE: Geological implication |
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| DAI Yu
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LIU Jiang-ling
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LIU Xu-guang
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WANG Jian-min.ZIRCON U-Pb AGE OF THE DACHAZI SYENOGRANITE IN DUOBAOSHAN AREA,HEILONGJIANG PROVINCE: Geological implication[J].Geology and Resources,2012,21(2):188-193. |
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| Authors: | DAI Yu LIU Jiang-ling LIU Xu-guang WANG Jian-min |
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| Institution: | 1. Heilongjiang Institute of Geological Survey, Harbin 161005, China;2. Shaanxi Zhonghe Resources Co., Ltd., Xi'an 710077, China |
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| Abstract: | The geochronology with zircon SHRIMP U-Pb isotope of the Dachazi syenogranite, cropped in Duobaoshan area, Heilongjiang Province, is studied to find out its age and geological background. The result suggests that the zircon has significant zonal structure, with Th/U ratio of 0.41- 0.99, which is a typical granitic magma-type zircon. Zircons in the syenogranite from 11 observation points are analyzed, obtaining the weighted average 2206Pb/253U age of 345＋3 Ma （n = 11, SMWD = 0.99）, which represents the crystallizing age of the syenogranite, showing the formation age of Early Carboniferous. The analysis on the major elements and geochemistry shows that the syenogranite belongs to high potassium cale-alkaline series. genetically as A-type granite. |
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| Keywords: | syenogranite zircon SHRIMP U-Pb age Early Carboniferous lithogeochemistry Duobaoshan area Heilongjiang Province |
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