| 大兴安岭北段霍洛台铜铅锌矿区花岗闪长岩的岩石成因:地球化学和锆石U-Pb年代学制约 |
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| 引用本文： | 尚毅广,孙丰月,姜和芳,王启,尹悦,孟庆鹏,张志颖.大兴安岭北段霍洛台铜铅锌矿区花岗闪长岩的岩石成因:地球化学和锆石U-Pb年代学制约[J].世界地质,2017,36(2):474-485. |
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| 作者姓名： | 尚毅广 孙丰月 姜和芳 王启 尹悦 孟庆鹏 张志颖 |
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| 作者单位： | 1. 吉林大学地球科学学院, 长春 130061;
2. 黑龙江省齐齐哈尔矿产勘查开发总院, 黑龙江齐齐哈尔 161000 |
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| 摘 要： | 黑龙江省大兴安岭地区霍洛台花岗闪长岩的锆石LA-ICP-MS U-Pb年代学表明,霍洛台花岗闪长岩(145 Ma)为早白垩世岩浆侵入产物。元素地球化学组成表明,为一套具埃达克岩特征的高钾钙碱性系列岩石,表现为高SiO_2(65.64%~66.00%)、高K_2O(3.67%~3.77%)、低MgO(0.09%~1.21%)、高Sr含量(814.00×10~(-6)~893.00×10~(-6)),低Yb(0.194×10~(-6)~0.536×10~(-6))和Y(6.38×10~(-6)~7.73×10~(-6)),A/CNK为0.94~0.958,轻重稀土元素分异明显。La/Yb(92.54~245.88)、Th/La(0.17~0.2)、Th/U(4.01~4.84)和Mg~#值(26.70~29.22)等特征显示霍洛台花岗闪长岩为加厚下地壳部分熔融形成。结合区域构造演化背景,认为霍洛台花岗闪长岩为受蒙古—鄂霍茨克构造体系影响下地壳加厚挤压-伸展转换阶段作用产物。
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| 关 键 词： | 大兴安岭霍洛台 花岗闪长岩 锆石U-Pb年龄 岩石地球化学 构造环境 |
| 收稿时间： | 2016-12-26 |
| 修稿时间： | 2017-03-01 |
Petrogenesis of granodiorites in Huoluotai Cu-Pb-Zn mining area: constrain from geochemistry and zircon U-Pb geochronology,northern Daxing'anling |
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| SHANG Yi-guang,SUN Feng-yue,JIANG He-fang,WANG Qi,YIN Yue,MENG Qing-peng,ZHANG Zhi-ying.Petrogenesis of granodiorites in Huoluotai Cu-Pb-Zn mining area: constrain from geochemistry and zircon U-Pb geochronology,northern Daxing'anling[J].World Geology,2017,36(2):474-485. |
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| Authors: | SHANG Yi-guang SUN Feng-yue JIANG He-fang WANG Qi YIN Yue MENG Qing-peng ZHANG Zhi-ying |
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| Institution: | 1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. Heilongjiang Qiqihaer Mineral Exploration and Development Institute, Qiqihaer 161000, Heilongjiang, China |
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| Abstract: | LA-ICP-MS U-Pb zircon geochronology of Huoluotai granodiorite of Daxing'anling area in Heillongjiang Province shows that Huoluotai granodiorite (145 Ma) results from magmatic intrusion of Early Cretaceous. The composition of elementary geochemistry indicates that it is a set of adakitic rocks characterized by high-K calc-alkaline series, with a high content of SiO2 (65.64%~66.00%) and K2O (3.67%~3.77%), low MgO (0.09%~1.21%), high content of Sr (814.00×10-6~893.00×10-6), low Yb (0.194×10-6 to 0.536×10-6) and Y (6.38×10-6 to 7.73×10-6), and obvious differentiation of light and heavy rare earth elements (10.1~14). The characteristics of La/Yb (92.54~245.88), Th/La (0.17~0.2), Th/U (4.01~4.84) and Mg# (26.70~29.22) show that the Huoluotai granodiorite was formed by partially melting of the thickened lower crust. Combined with regional tectonic evolution, it is concluded that the Huoluotai granodiorite originated from the transition process of crustal thickening compression to extension under the influence of Mongolia-Okhotsk tectonic system. |
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| Keywords: | Huoluotai of Daxinganling granodiorite zircon U-Pb chronology geochemistry tectonic environment |
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