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| 鲁西铜石岩体的锆石SHRIMP U-Pb年龄及其地质意义 | |
| 引用本文： | 胡华斌,毛景文,刘敦一,牛树银,王涛,李永峰,石玉若.鲁西铜石岩体的锆石SHRIMP U-Pb年龄及其地质意义[J].地学前缘,2004,11(2):453-460. |
| 作者姓名： | 胡华斌 毛景文 刘敦一 牛树银 王涛 李永峰 石玉若 |
| 作者单位： | 1. 中国地质大学,地球科学与资源学院,北京,100083;石家庄经济学院,资源学院,河北,石家庄,050031 2. 中国地质大学,地球科学与资源学院,北京,100083 3. 中国地质科学院,地质研究所,北京,100037 4. 石家庄经济学院,资源学院,河北,石家庄,050031 |
| 基金项目： | 国家重点基础规划发展项目 (G19990 43 2 11)，国家自然科学基金资助项目 ( 4 0 2 72 0 88)，中国地质调查局地质调查项目( 2 0 0 110 2 0 0 0 3 8) |
| 摘 要： | 首次报道了鲁西地区铜石岩体的锆石SHRIMPU Pb年龄结果。通过对斑状细粒闪长岩中单颗粒锆石 1 8个样品点的分析 ,获得了两组谐和年龄数据 ,其中有 1 0个分析点的2 0 6Pb/ 2 3 8U年龄为 1 6 7.9～ 1 83Ma ,加权平均值为 (1 75 .7± 3.8)Ma ;另外 8个分析点的2 0 7Pb/ 2 0 6Pb年龄为 2 5 0 2～ 2 5 5 4Ma ,加权平均值为 (2 5 1 8± 1 1 )Ma。二长斑岩样品仅获得 2个2 0 7Pb/ 2 0 6Pb年龄数据 ,在 2 4 85～ 2 5 1 2Ma之间。(1 75 .7± 3.8)Ma指示了铜石岩体的结晶年龄为中侏罗世 ,(2 5 1 8± 1 1 )Ma代表了岩体侵位过程中捕获的新太古代五台期锆石的年龄。根据SHRIMPU Pb年龄结果 ,认为鲁西地区存在燕山早期构造岩浆热事件 ,与之有关的归来庄金矿也在此时期形成 |
| 关 键 词： | SHRIMP U-Pb年龄 铜石岩体 中侏罗世 鲁西 |
| 文章编号： | 1005-2321(2004)02-0453-08 |
| 修稿时间： | 2004年2月26日 |
THE SHRIMP AGE OF ZIRCON FROM TONGSHI MAGMATIC COMPLEX IN WESTERN SHANDONG AND ITS GEOLOGICAL IMPLICATIONS |
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| HU Hua-bin.THE SHRIMP AGE OF ZIRCON FROM TONGSHI MAGMATIC COMPLEX IN WESTERN SHANDONG AND ITS GEOLOGICAL IMPLICATIONS[J].Earth Science Frontiers,2004,11(2):453-460. | |
| Authors: | HU Hua-bin |
| Institution: | HU Hua-bin~ |
| Abstract: | This paper reports the SHRIMP U-Pb age of zircon from Tongshi magmatic complex in western Shandong. Eighteen analyses on zircon grains from porphyritic fine-grained diorite gave two concordant groups of ages, in which ten analyses presented ~(206) Pb/~(238) U ages from 167.9 Ma to 183 Ma with a weighted mean age at (175.7±3.8) Ma, and the other eight analyses provided ~(207) Pb/~(206) Pb ages from (2 502) Ma to 2 554 Ma with a weighted mean (2 518±11) Ma. Two analyses on zircon grains from syenite porphyry yield the ages of 2 485 Ma and 2 512 Ma, respectively. The age of (175.7±3.8) Ma indicates that the crystallization of Tongshi magmatic complex occurred in the middle Jurassic epoch. The age of (2 518±11) Ma is interpreted as the age of inherited magmatic zircon in Neo-archean Wutai period. According to the SHRIMP U-Pb data of zircon, the authors consider that there existed the early Yanshanian tectonic-magmatic thermal events in western Shandong, and the Guilaizhuang gold deposit related to Tongshi magmatic complex was formed between 170 Ma and 160 Ma. |
| Keywords: | SHRIMP U-Pb age of zircon Tongshi magmatic complex middle Jurassic epoch western Shandong |
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