安徽牯牛降A型花岗岩的年代学_地球化学和构造意义_谢建成.pdf

1000-0569 /2012 /028( 12) -4007-20 Acta Petrologica Sinica 岩石学报 A 、 安徽牯牛降 型花岗岩的年代学 地球化学和 * 构造意义 谢 1，2 陈 2 荣 3 李 2 杨 3 孙 1 建成 思 伟 全忠 晓勇 卫东 XIE JianCheng1，2 ，CHEN Si2 ，RONG Wei3 ，LI QuanZhong2 ，YANG XiaoYong3 and SUN WeiDong1 1. 中 ， 510640 国科学院广州地球化学研究所 广州 2. ， 230009 合肥工业大学资源与环境工程学院 合肥 3. ， 230026 中国科学技术大学地球和空间科学学院 合肥 1. Guangzhou Institute of Geochemistry ，Chinese Academy of Sciences ，Guangzhou 510640 ，China 2. Department of Resource and Environmental Sciences ，Hefei University of Technology ，Hefei 230009 ，China 3. School of Earth and Space Sciences ，University of Science and Technology of China，Hefei 230026 ，China 2012-09-11 收稿 ，2012-11-05 改回 . Xie JC ，Chen S ，Rong W ，Li QZ ，Yang XY and Sun WD. 2012. Geochronology ，geochemistry and tectonic significance of :4007 － 4020 Guniujiang A-type granite in Anhui Province. Acta Petrologica Sinica ，28 (12) Abstract The Guniujiang intrusion in southern Anhui Province is located at the southeastern boundary of Yangtze plate ，and situated in Jiangnan uplift. Here we report new zircon U-Pb age and geochemical data ，and discuss the petrogenesis and tectonic significance of the Guniujiang granite. Laser ablation ICP-MS zircon U-Pb dating suggests that the age of the Guniujiang granite is 130. 1 ± 1. 3Ma (95% confidence ，MSWD = 0. 55). Combined with other available high-precision zircon U-Pb data，the ages of these granites from southern Anhui are mainly concentrated in 125 ～ 130Ma. The Guniujiang granite is a high calc-alkali