华北板块北缘中段早中二叠世的构造_省略_石U_Pb年代学和地球化学的制约_王挽琼.pdfVIP

1000-0569 / 2013 /029 ( 09) -2987-03 Acta Petrologica Sinica 岩石 学报 : 华北板块北缘中段早中二叠世的构造属性 来自 * 花岗岩类锆石U-Pb 年代学及地球化学的制约 ＊＊ 王挽琼 徐仲元 刘正宏 赵庆英 蒋孝君 WANG WanQiong ，XU ZhongYuan ＊＊ ，LIU ZhengHong ，ZHAO QingYing and JIANG XiaoJun ， 130061 吉林大学地球科学学院 长春 College of Earth Science ，Jilin University ，Changchun 130061 ，China 20 12-11-19 收稿 ，20 13-06-11 改回 . Wang WQ ，Xu ZY ，Liu ZH ，Zhao QY and Jiang XJ. 2013. Early-Middle Permian tectonic evolution of the central-northern margin of the North China Craton :Constraints from zircon U-Pb ages and geochemistry of the granitoids. Acta Petrologica Sinica ，29 (9):2987 － 3003 Abstract This paper presents petrological ，geochronological and geochemical study on Late Paleozoic intermediate-felsic intrusions from the Ondor Sum-Tieshagai area in Inner Mongolia ，which is tectonically located in the central-northern margin of the North China Craton. These intrusions comprise mainly biotite-hornblende quartz diorite and hornblende-biotite granodiorite with abundant mafic enclaves in field. U-Pb dating of zircons from three samples by LA-ICP-MS yield weighed mean 206 Pb / 238 U ages of 27 1. 8 ± 2. 4Ma ， 27 1. 4 ± 1. 3Ma and 268. 7 ± 1. 3Ma ，respectively. These rocks have SiO = 61. 42% ～ 7 1. 73% ，K O = 3. 10% ～ 5. 11% ，K O / 2 2 2 Na O = 0. 93 ～ 1. 96 ，Mg# = 42. 54 ～ 49. 93 ，A / CNK = 0. 90 ～ 1. 03 ，features of high-K calc-alkaline I-type granitoids. They also show 2 strong enrichments in light rare earth (LＲEEs)and large ion lithophile elements (LILEs ，e. g. ，Cs ，Ｒ