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| 北秦岭西段红花铺俯冲型侵入体LA-ICPMS定年及其地质意义 | |
| 引用本文： | 王洪亮,何世平,陈隽璐,徐学义,孙勇,第五春荣.北秦岭西段红花铺俯冲型侵入体LA-ICPMS定年及其地质意义[J].现代地质,2006,20(4):536-544. |
| 作者姓名： | 王洪亮 何世平 陈隽璐 徐学义 孙勇 第五春荣 |
| 作者单位： | 1. 西北大学,地质学系,陕西,西安,710069;西安地质矿产研究所,陕西,西安,710054 2. 西安地质矿产研究所,陕西,西安,710054;中国地质大学,地球科学学院,湖北,武汉,430074 3. 西安地质矿产研究所,陕西,西安,710054 4. 西北大学,地质学系,陕西,西安,710069;西北大学,大陆动力学重点实验室,陕西,西安,710069 5. 西北大学,大陆动力学重点实验室,陕西,西安,710069 |
| 基金项目： | 中国地质调查局国土资源大调查研究项目(1212010510416) |
| 摘 要： | 北秦岭造山带西段红花铺侵入体的岩石类型为中细粒英云闪长岩,具俯冲型花岗岩类的地球化学特征。通过对其中所获锆石的形态及CL图像特征的研究,分辨出3种不同成因的锆石,通过高精度的LA-ICPMS(激光剥蚀等离子体质谱)单颗粒锆石微区U-Pb同位素年龄测定,获得(1 765.1±8.4)M a、(450.5±1.8)M a、(413.5±1.3)M a的3组年龄值,分别为继承锆石年龄、成岩锆石年龄和变质锆石年龄,代表了3期构造-热事件的时限,可能是吕梁运动和加里东运动在北秦岭西段的地质记录。红花铺侵入体英云闪长岩(450.5±1.8)M a的成岩年龄可能代表了北秦岭西段早古生代俯冲带岛弧的形成时代。红花铺俯冲型侵入体的形成时代及构造环境的确定,对研究北秦岭造山带元古宙—早古生代大地构造格局、构造演化及中国大陆动力学机制具有重要意义。 |
| 关 键 词： | 北秦岭 红花铺侵入体 LA-ICPMS定年 构造意义 |
| 文章编号： | 1000-8527(2006)04-0536-09 |
| 收稿时间： | 04 23 2006 12:00AM |
| 修稿时间： | 09 5 2006 12:00AM |
LA-ICPMS Dating of Zircon U-Pb and Tectonic Significance of Honghuapu Subduction-Related Intrusions in the West Segment of Northern Qinling Mountains |
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| WANG Hong-liang,HE Shi-ping,CHEN Juan-lu,XU Xue-yi,SUN Yong,DIWU Chun-rong.LA-ICPMS Dating of Zircon U-Pb and Tectonic Significance of Honghuapu Subduction-Related Intrusions in the West Segment of Northern Qinling Mountains[J].Geoscience——Journal of Graduate School,China University of Geosciences,2006,20(4):536-544. | |
| Authors: | WANG Hong-liang HE Shi-ping CHEN Juan-lu XU Xue-yi SUN Yong DIWU Chun-rong |
| Abstract: | Honghuapu intrusions in the west segment of Northern Qinling Mountains are dominated by tonalite with medium-fine-granular structure,which carry the geochemic characteristics of subduction-related granitic rocks.Zircons obtained from Honghuapu intrusions can be divided into three groups according to the shapes and CL images.Based on the results of LA-ICPMS dating of zircon U-Pb isotope,we get three ages of(1,765.1±8.4)Ma,(450.5±1.8)Ma and(413.5±1.3)Ma,these ages indicate different formation age of hereditary zircons,magmatic crystallization zircons and metamorphic zircons,which may represent three tectonic-thermal events coincide to Lüliang Movement and Caledonia Movement respectively.Whereas,the age of(450.5±1.8)Ma is the formation age of Honghuapu intrusions and also implies the formation age of Early Paleozoic(island) arcs in Northern Qinling.These new LA-ICPMS datings of zircon U-Pb have great significance to the study of Proterozoic and Early Paleozoic tectonic framework,evolution and dynamic mechanism of Qinling Mountains. |
| Keywords: | Northern Qinling Mountains Honghuapu intrusions LA-ICPMS dating tectonic significance |
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