| 玲珑金矿区成矿后花岗斑岩脉的锆石SHRIMP U-Pb年龄对胶北地体演化的制约 |
| |
| 引用本文： | 李俊建,罗镇宽,刘晓阳,徐卫东,陈安蜀.玲珑金矿区成矿后花岗斑岩脉的锆石SHRIMP U-Pb年龄对胶北地体演化的制约[J].地学前缘,2005,12(2):317-323. |
| |
| 作者姓名： | 李俊建 罗镇宽 刘晓阳 徐卫东 陈安蜀 |
| |
| 作者单位： | 中国地质大学,地球科学与资源学院,北京,100083;中国地质调查局,天津地质矿产研究所,天津,300170;中国地质调查局,天津地质矿产研究所,天津,300170;中国地质大学,地球科学与资源学院,北京,100083 |
| |
| 基金项目： | 中国地质调查局地质调查项目;科技部社会公益研究项目 |
| |
| 摘 要： | 采用SHRIMP测年技术对玲珑金矿区成矿后花岗斑岩脉的锆石进行了U Pb年龄测定,获得岩脉岩浆锆石的206Pb/238U平均年龄为119.4 Ma,同时获得大量的继承锆石年龄,范围从3 114~127 Ma。继承锆石年龄显示,胶北地体前寒武纪经历了中太古代的陆核生成阶段;新太古代花岗岩绿岩地体增生阶段;古元古代孔兹岩系的沉积阶段;新元古代蓬莱群盖层形成阶段。整个古生代,地体处于稳定的隆升受剥蚀状态,没有明显的岩浆活动。三叠纪,华南与华北克拉通碰撞,郯庐断裂带形成。晚三叠世—中侏罗世,后碰撞的巨大挤压作用导致华北克拉通南缘地壳增厚,玲珑和蚌埠荆山等花岗岩生成。中晚侏罗世,郯庐断裂带发生了巨大的左行平移,胶北地体从蚌埠—五河的东部推移到现在的位置。早白垩世,郯庐断裂由左旋压扭向右行拉张转化,导致胶北地体上郭家岭岩体生成。中晚白垩世,郯庐断裂发生了大规模的拉张,导致沂沭裂谷、胶莱盆地、青山组火山岩、金矿床形成和隆起区大量脉岩侵入。
|
| 关 键 词： | 花岗斑岩脉 锆石SHRIMP测年 玲珑金矿 胶北地体 |
| 文章编号： | 1005-2321(2005)02-0317-07 |
| 修稿时间： | 2004年10月30 |
Constraints to the evolution of Jiaobei terrane from SHRIMP U-Pb zircon data of post-metallogenic granite porphyry vein in Linglong gold deposit,Shandong Province,East China |
| |
| LI Jun-jian,LUO Zhen-kuan,LIU Xiao-yang,XU Wei-dong,CHEN An-shu.Constraints to the evolution of Jiaobei terrane from SHRIMP U-Pb zircon data of post-metallogenic granite porphyry vein in Linglong gold deposit,Shandong Province,East China[J].Earth Science Frontiers,2005,12(2):317-323. |
| |
| Authors: | LI Jun-jian LUO Zhen-kuan LIU Xiao-yang XU Wei-dong CHEN An-shu |
| |
| Abstract: | The zircons extracted from a post-metallogenic granite porphyry vein in the Linglong gold deposit were dated by U-Pb SHRIMP method. An average (~(206)Pb/~(238)U) age of 119.4 Ma was obtained from magmatic zircons, whereas ages ranging from 3 114 to 127 Ma were obtained from inherited zircons. From the ages of inherited zircons, we propose that the Jiaobei terrane has undergone through a phases of continental growth in the Middle Archean, a granite-greenstone terrane accretion in the Neoarchean, sedimentation of khondalite series in the Paleoproterozoic, and the formation of Penglai group in the Neoproterozoic. In the whole Palaeozoic Era, the terrane was in a steady stage of uplift and denudation, with weak magmatic activity in the inner parts of the terrane. In the Triassic period, following the collision between North-China and South-China cratons, the Tanlu fault zone was formed. In the late Triassic to the middle Jurassic period, the strong post-collision compression between North-China and South-China cratons resulted in crustal thickening along the southern edge of the North-China craton and the intrusion of Linglong and Bengbujinshan granites. In the middle to late Jurassic period, owing to a large-scale left-lateral displacement of Tanlu fault zone, the Jiaobei terrane moved to the present position from the east of Bengbu-Wuhe area. In the early Cretaceous period, the Tanlu fault zone experienced a change from left-lateral compression to right-lateral extension, which was accompanied by the intrusion of Guojialing granite. In the middle to late Cretaceous period, the Tanlu fault zone experienced a large-scale extension which resulted in the formation of Yishu rift, Jiaolai basin, dyke emplacement and the eruption of volcanic rocks of the Qingshan formation and many gold deposits. |
| |
| Keywords: | granite-porphyry vein SHRIMP U-Pb zircon dating Linglong gold deposit Jiaobei terrane |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
