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| 华北克拉通小秦岭地区元古宙正长岩LA-ICP-MS锆石U-Pb年龄及其地质意义 | |
| 引用本文： | 马桂霞,刘富营,苏犁,韩衣贵,王清海.华北克拉通小秦岭地区元古宙正长岩LA-ICP-MS锆石U-Pb年龄及其地质意义[J].吉林大学学报(地球科学版),2013,43(5):1457-1470. |
| 作者姓名： | 马桂霞 刘富营 苏犁 韩衣贵 王清海 |
| 作者单位： | 1.长春工程学院，长春130012; 2.河南省区域地质调查院，郑州450001; 3.中国地质大学(北京)地学实验中心，北京100083; 4.吉林大学东北亚国际地学研究与教学中心,长春130026 |
| 基金项目： | 国家自然科学基金项目(41072039) |
| 摘 要： | 小秦岭地区是华北克拉通中央带南部一个重要组成部分。关于其地壳组成、变质作用，尤其是岩浆作用年龄的研究，对确认小秦岭地区在1.85～1.70 Ga期间大地构造是非常重要的。报道了小秦岭地区北部古元古代正长岩LA-ICP-MS锆石 U-Pb平均年龄为（1 831.0±6.8）Ma(95%可信度，MSWD=0.37)；结合年龄数据和地质证据，认为小秦岭地区（1 831.0±6.8）Ma正长岩形成于华北克拉通南缘地壳减薄作用环境之中，可能也是大火成岩省的一个组成部分，并探讨了华北克拉通在1.90～1.85 Ga和1.85～1.70 Ga 期间的演化历史。 |
| 关 键 词： | 元古宙 U-Pb年龄 正长岩 小秦岭 地球化学 华北克拉通 |
LA-ICP-MS Zircon U-Pb Age from the Proterozoic Syenite in Xiaoqinling Area in the North China Craton and Its Geological Implications |
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| Ma Guixia;Liu Fuying;Su Li;Han Yigui;Wang Qinghai.LA-ICP-MS Zircon U-Pb Age from the Proterozoic Syenite in Xiaoqinling Area in the North China Craton and Its Geological Implications[J].Journal of Jilin Unviersity:Earth Science Edition,2013,43(5):1457-1470. | |
| Authors: | Ma Guixia;Liu Fuying;Su Li;Han Yigui;Wang Qinghai |
| Institution: | 1.Changchun Institute of Technology, Changchun130012, China; 2.Henan Institute of Geology Survey, Zhengzhou450001, China; 3.The Geological Lab Center，China University of Geoseienees，Beijing100083, China; 4.International Center for Geoscience Research and Education in Northeast Asia,Jilin University，Changchun130026,China |
| Abstract: | The Xiaoqinling area is an important composition of southern segment of the Trans-North China Orogen within the North China craton. It is of an important significance to study construction, metamorphism, especially magmatism for revealing tectonic history of the Xiaoqinling area during the Paleo-to Mid-Proterozoic. This paper reports zircon LA-ICP-MS U-Pb dating results from the Proterozoic syenite dyke in the northern Xiaoqinling Mt. The dating results indicate that the syenite formed in（1 831.0±6.8） Ma (95% conf., MSWD = 0.37), i.e., the Paleoproterozoic. Combined with the published data, we consider that the syenite from the Xiaoqinling Mt. formed under a crust thinning environment related to a Larger Igneous Province. |
| Keywords: | Proterozoic U-Pb age syenite Xiaoqinling Mountain geochemistry the North China craton |
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