SHRIMP Zircon U‐Pb Dating of the Tongshi Magmatic Complex in Western Shandong and Its Geological Implications
SHRIMP Zircon U‐Pb Dating of the Tongshi Magmatic Complex in Western Shandong and Its Geological Implications
复制标题
DOI：
10.1111/j.1755-6724.2005.tb00915.x
复制
发表时间：
2005-08
期刊：
影响因子：
--
通讯作者：
Huang Huabin;Mao Jingwen;L. Dun-yi;Niu Shu-yin;Wang Yanbin;Li Yongfeng;Shi Ruruo
中科院分区：
文献类型：
--
作者：
Huang Huabin;Mao Jingwen;L. Dun-yi;Niu Shu-yin;Wang Yanbin;Li Yongfeng;Shi Ruruo
摘要本文介绍了鲁西铜石岩浆杂岩SHRIMP锆石U-Pb定年结果。铜石岩浆杂岩由细粒斑状闪长岩和正长斑岩组成。18个细粒斑状闪长岩的分析给出了两个一致年龄，其中10个分析构成年轻年龄组，给出的206 Pb/238 U年龄范围为167.9 ~ 183 Ma，加权平均年龄为175.7±3.8 Ma，另外8个分析给出的207 Pb/206 Pb年龄范围为2502 ~ 2554 Ma，加权平均年龄为2518±11 Ma。对正长斑岩的两次分析分别给出了2485 Ma和2512 Ma的年龄。175.7± 3.8Ma的年龄表明铜石岩浆杂岩的结晶作用发生在中侏罗世，而2518±11 Ma的年龄则表明继承性岩浆锆石的年龄发生在新太古代五台期。
Abstract The SHRIMP U‐Pb zircon dating result of the Tongshi magmatic complex in western Shandong is presented in this paper. The Tongshi magmatic complex comprises fine‐grained porphyritic diorite and syenitic porphyry. Eighteen analyses for fine‐grained porphyritic diorite gave two concordia ages, in which ten analyses constitute the young age group, giving 206Pb/238U ages ranging from 167.9 Ma to 183 Ma with a weighted mean age of 175.7±3.8 Ma, and the other eight yielded 207Pb/206Pb ages of 2502 Ma to 2554 Ma with a weighted mean 2518±11 Ma. Two analyses for syenitic porphyry gave ages of 2485 Ma and 2512 Ma, respectively. The age of 175.7±3.8 Ma indicates that the crystallization of the Tongshi magmatic complex occurred in the Middle Jurassic, whereas that of 2518±11 Ma is interpreted as the age of inherited magmatic zircons in the Neoarchean Wutai period.