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| 西秦岭略阳地区鱼洞子杂岩变形花岗岩锆石LA-ICP-MS U-Pb测年及地质意义 | |
| 引用本文： | 张 欣,徐学义,宋公社,王洪亮,陈隽璐,李 婷.西秦岭略阳地区鱼洞子杂岩变形花岗岩锆石LA-ICP-MS U-Pb测年及地质意义[J].地质通报,2010,29(4):510-517. |
| 作者姓名： | 张 欣 徐学义 宋公社 王洪亮 陈隽璐 李 婷 |
| 作者单位： | 1. 中国地质调查局西安地质矿产研究所,陕西,西安,710054;长安大学地球科学与国土资源学院,陕西,西安,710054 2. 中国地质调查局西安地质矿产研究所,陕西,西安,710054 3. 陕西省地质调查院,陕西,西安,710054 4. 长安大学地球科学与国土资源学院,陕西,西安,710054 |
| 基金项目： | 中国地质调查局国土资源大调查项目，国家自然科学基金，国家科技支撑计划 |
| 摘 要： | 鱼洞子杂岩是秦岭地区最古老的复杂的地质体。前人对鱼洞子杂岩不同的地质体采用多种方法进行了年龄测定,但结果差异较大,且总体测试精度不高。依据锆石CL影像的特征,结合锆石成因分析和锆石微区的U-Pb同位素,进行了LA-ICP-MS测定,在鱼洞子杂岩糜棱岩化细粒黑云母花岗岩和强片理化黑云母花岗岩中分别获得2661Ma±17Ma和2703Ma±26Ma的岩浆结晶年龄,同时在糜棱岩化细粒黑云母花岗岩中获得2647Ma±65Ma的变质锆石年龄。其中2703Ma±26Ma是秦岭造山带目前发现的最古老的侵入岩的形成年龄,为研究秦岭造山带早前寒武纪构造岩浆事件和地球早期的形成演化提供了新的资料。 |
| 关 键 词： | 鱼洞子岩群 太古宙 锆石 LA-ICP-MS U-Pb年龄 花岗岩事件 |
Zircon LA-ICP-MS U-Pb dating and significance of Yudongzi Group deformation granite from Lueyang area, western Qinling, China |
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| ZHANG Xin,XU Xue-yi,SONG Gong-she,WANG Hong-hang,CHEN Jun-lu,LI Ting.Zircon LA-ICP-MS U-Pb dating and significance of Yudongzi Group deformation granite from Lueyang area, western Qinling, China[J].Geologcal Bulletin OF China,2010,29(4):510-517. | |
| Authors: | ZHANG Xin XU Xue-yi SONG Gong-she WANG Hong-hang CHEN Jun-lu LI Ting |
| Institution: | 1. Xi'an Institute of Geology and Mineral Resources, China Geological Survey, Xi'an 710054, Shaanxi, China;2. College of Earth Science and Resources of Chang' an University, Xi'an 710054, Shaanxi, China;3. Institute of Geological Survey of Shaanxi Province, Xi'an 710054, Shaanxi, China |
| Abstract: | Yudongzi complex is the oldest geological mass in the Qinling area. Previous researchers have determined the age of Yudongzi Group in many ways, but the results are quite diverse, thus poor in accuracy. Based on image features of zircon, combined with genetic analysis of zircon and microdomains U-Pb isotope LA-ICP-MS (laser ablation ICP-MS) determination, separately we've obtained the magma crystallization age 2661±17Ma and 2703±26Ma respectively for mylonited fine-grained biotite granite and strong schistosity biotite granite in Yudongzi complex, and metamorphic zircon age 2647±65Ma in the mylonited fine-grained biotite granite. Among which 2703±26Ma is the oldest intrusion that had been discovcered in the Qinling Orogenic Belt up to now, it provides a new evidence for Precambrian tectonic-magmatic events and the evolution of early Earth in Qinling Orogenic Belt research. |
| Keywords: | Yudongzi Group Archean zircon LA-ICP-MS U-Pb age granite event |
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