| 青海沱沱河地区赛多浦岗日二长花岗岩中黑云母化学成分特征及地质意义 |
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| 引用本文： | 冯泓达,孙国胜,卢大超,曲远馨,晋瑞香,何欣,李洋.青海沱沱河地区赛多浦岗日二长花岗岩中黑云母化学成分特征及地质意义[J].世界地质,2017,36(3):777-784. |
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| 作者姓名： | 冯泓达 孙国胜 卢大超 曲远馨 晋瑞香 何欣 李洋 |
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| 作者单位： | 1. 吉林大学地球科学学院, 长春 130061;2. 长春黄金设计院, 长春 130012;3. 中国科学院地球环境研究所, 西安 710061 |
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| 基金项目： | “青海省塞多浦岗日地区Ⅰ46E015006，Ⅰ46E015007，Ⅰ46E016006，Ⅰ46E016007四幅区调”项目基金资助. |
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| 摘 要： | 电子探针分析结果表明,沱沱河地区赛多浦岗日二长花岗岩中黑云母具有富MgO、SiO_2、(Na_2O+K_2O),相对贫Al_2O_3、FeO~t的特征;镁质率(M=0.60~0.65)高,∑Al值(1.30~1.39)偏低,中等Fe/(Mg+Fe)(0.42~0.44)比值,为镁质黑云母;估算其结晶温度为580℃~645℃,且岩浆体系具有较高的氧逸度。黑云母的成分特征显示其寄主岩体为造山背景下形成的钙碱性花岗岩,其源区具有壳-幔混源的特征。
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| 关 键 词： | 青海 赛多浦岗日 二长花岗岩 黑云母 化学成分特征 |
| 收稿时间： | 2017-04-10 |
| 修稿时间： | 2017-04-26 |
Chemical composition and geological significance of biotites from monzonitic granite in Tuotuohe Saiduopugangri area in Qinghai |
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| FENG Hong-da,SUN Guo-sheng,LU Da-chao,QU Yuan-xin,JIN Rui-xiang,HE Xin,LI Yang.Chemical composition and geological significance of biotites from monzonitic granite in Tuotuohe Saiduopugangri area in Qinghai[J].World Geology,2017,36(3):777-784. |
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| Authors: | FENG Hong-da SUN Guo-sheng LU Da-chao QU Yuan-xin JIN Rui-xiang HE Xin LI Yang |
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| Institution: | 1. College of Earth Sciences, Jilin University, Changchun 130061, China;2. Changchun Gold Design Institute, Changchun 130012, China;3. Institute of Earth Environment, Chinese Academy of Science, Xi'an 710061, China |
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| Abstract: | Electron microprobe analyses (EMPA) demonstrate that biotites from the Saiduopugangri monzonitic granite in Tuotuohe area, Qinghai Province, are enriched in MgO, SiO2, (Na2O+K2O), but relatively depleted in Al2O3 and FeOt, with the characteristics of high M (0.60~0.65), low ∑Al (1.30~1.39) and medium Fe/(Mg+Fe) (0.42~0.44), suggesting that they are Mg-biotites. The biotites crystallized at the temperature of 580℃ to 645℃ with high oxygen fugacity in the magmatic system. The compositions of biotites revel that the calc-alkaline granite formed in the orogenic background and the magma was from crust-mantle mixed source. |
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| Keywords: | Qinghai Saiduopugangri monzonitic granite biotites chemical composition |
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