| 谈乐,张永强,刘小朋,李小明,张运周.南秦岭陕西省两河地区花岗伟晶岩LA-ICP-MS锆石U-Pb测年及其地球化学特征[J].地质找矿论丛,2019,34(4):579-587 |
| 南秦岭陕西省两河地区花岗伟晶岩LA-ICP-MS锆石U-Pb测年及其地球化学特征 |
| LA-ICP-MS zircon U-Pb dating and geochemical characteristics of granitic pegmatite in Lianghe area, Shaanxi province, south Qinling mountains |
| 投稿时间：2019-06-20 修订日期：2019-07-03 |
| DOI：10.6053/j.issn.1001-1412.2019.04.011 |
| 中文关键词: 花岗伟晶岩 锆石U-Pb测年 中侏罗世 地球化学特征 两河地区 陕西省 |
| 英文关键词:granitic pegmatite U-pb dating of zircon Middle Jurassic geochemical characteristics Lianghe area Shaanxi province |
| 基金项目:中国地质调查局项目"陕西石泉-旬阳金矿带整装勘查区矿产地质调查与找矿预测"（编号：DD20190159-02）资助。 |
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| 中文摘要: |
| 南秦岭陕西省两河地区出露的中粗粒花岗伟晶岩LA-ICP-MS锆石U-Pb测年加权平均年龄值为172.5 Ma±1.7 Ma，其形成时代为中侏罗世。花岗伟晶岩的岩石地球化学特征表明：该岩石为过铝质-高钾钙碱性系列；微量元素中Rb、Ba、U、Ta含量相对富集，Th、Nb、Sr、Zr、Hf相对贫化；稀土元素具有Eu正异常（δEu=1.60~2.53），总体表现出典型的M型稀土元素四分组效应。花岗伟晶岩w（Na2O+K2O）/w（Al2O3）、w（TFeO）/w（MgO）值高，属A型花岗岩；通过R2-R1构造环境判别图解均落在造山后期、造山期后A型花岗岩区中。综合分析该期花岗伟晶岩为造山后期过铝质-高钾钙碱性A型花岗岩。 |
| 英文摘要: |
| The U-Pb dating of medium and coarse granitic pegmatite samples in Lianghe area of Shaanxi province is 172.5 Ma±1.7 Ma corresponding to Middle Jurassic Epoch. Geochemical characteristics of pegmatite show that it belongs to peraluminous-high potassium calc-alkaline series. Trace elements of Rb、Ba、U、Ta are relatively enriched and Th、Nb、Sr、Zr、Hf relatively depleted. The rare earth element Eu has positive abnormal characteristics (δEu=1.60 to 2.53. Generally is shown the typical M type with tetrad effect of REE. The w(Na2O+K2O)/w(Al2O3) and w(TFeO)/w(MgO) values are high indicating that it is A-type granite. In the discriminant diagrams of R2-R1 geotectonic environment values fall into the late orogenic and post-orogenic A-type granite areas. The granitic pegmatite in this period is a peraluminous high-potassium calc-alkaline A-type granite in the late orogenic period. |
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