| 鲁西济南辉长岩的形成时代:锆石LA-ICP-MS U-Pb定年证据 |
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| 关键词:gabbro zircon LA-ICP-MS U-Pb dating Mesozoic Jinan |
| 基金项目:国家自然科学基金重点项目（编号：40133020和40472033）;西北大学大陆动力学重点实验室开放实验室基金项目资助 |
| 作者 | 单位 | E-mail | | 杨承海 | 吉林大学地球科学学院,吉林长春,130061
山东省地质矿产局,山东济南,250013 | xuw126@sina.com | | 许文良 | 吉林大学地球科学学院,吉林长春,130061 | | | 杨德彬 | 吉林大学地球科学学院,吉林长春,130061 | | | 刘长春 | 山东省地质矿产局,山东济南,250013 | | | 柳小明 | 西北大学大陆动力学重点实验室,陕西西安,710069 | | | 胡兆初 | 西北大学大陆动力学重点实验室,陕西西安,710069 | |
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| Chronology of the Jinan Gabbro in Western Shandong: Evidence from LA-ICP-MS Zircon U-Pb Dating |
| The zircons from Jinan gabbro show euhedral-subhedral shapes and striped absorption on their cathodoluminescence (CL) images. The Th/U ratios of zircons range from 0.44 to 1.46, indicating that they were formed by normal crystallization of magma. U-Pb dating of 30 zircons from Queshan, Huashan, and Yaoshan gabbros and of 11 zircons from Kuangshan gabbro was made on LA-ICP-MS. The results show that the data of 30 zircons cluster around the concordia of 124～142 Ma, yielding a weighted mean (206Pb)/238U age of 130.8±1.5 Ma, and that the data of 11 zircons yield a weighted mean ()206Pb/238U age of 127±2 Ma, which implies that the crystallization of the Jinan gabbro occurred in Early Cretaceous. It is held that the coexsitence of Early Cretaceous Jinan gabbro and synchronous granitoid characterizes bimodal magmatism in eastern North China craton and also implies the geodynamic background of a strong extension environment. |
| YANG Cheng-hai,XU Wen-liang,YANG De-bin,LIU Chang-chun,LIU Xiao-ming,HU Zhao-chu.2005.Chronology of the Jinan Gabbro in Western Shandong: Evidence from LA-ICP-MS Zircon U-Pb Dating[J].Acta Geoscientica Sinica,26(4):321-325. |
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