| 河北矾山钾质碱性超镁铁岩-正长岩杂岩体的锆石SHRIMP U-Pb年龄 |
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| 引用本文： | 任荣,牟保磊,韩宝福,张磊,陈家富,徐钊,宋彪.河北矾山钾质碱性超镁铁岩-正长岩杂岩体的锆石SHRIMP U-Pb年龄[J].岩石学报,2009,25(3):588-594. |
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| 作者姓名： | 任荣 牟保磊 韩宝福 张磊 陈家富 徐钊 宋彪 |
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| 作者单位： | 1. 北京大学地球与空间科学学院,造山带与地壳演化教育部重点实验室,北京,100871
2. 北京离子探针中心,中国地质科学院地质研究所,北京,100037 |
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| 基金项目： | 教育部"跨世纪人才计划" |
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| 摘 要： | 作为华北陆块北缘的碱性岩体之一，河北矾山钾质碱性超镁铁岩-正长岩杂岩体赋存着中国最大的内生磁铁矿-磷灰石矿床。关于其形成时代，已经发表的K-Ar、Rb-Sr和Sm-Nd法定年结果差别较大，因此需要采用更精确的定年方法限定岩体的形成时代。通过对矾山杂岩体的辉石正长岩样品进行SHRIMP锆石U-Pb定年，得到了218±2Ma的结果。由于定年样品取自构成矾山杂岩体主体、形成最晚的第三岩相带，这个年龄限定矾山杂岩体形成于晚三叠世。现有的锆石U-Pb年代学资料表明，晚三叠世侵入岩在华北陆块北缘、东缘、南缘普遍存在，成为中国东部晚三叠世构造-岩浆活动的显著特征之一。
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| 关 键 词： | 碱性侵入体 超镁铁岩-正长岩 锆石SHRIMP U-Pb定年 矾山杂岩体 |
| 收稿时间： | 2008/12/30 0:00:00 |
| 修稿时间： | 2009/2/11 0:00:00 |
Zircon SHRIMP U-Pb dating of the Fanshan potassic alkaline ultramafite-syenite complex in Hebei Province, China |
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| REN Rong,MU BaoLei,HAN BaoFu,ZHAO Lei,CHEN JiaFu,XU Zhao and SONG Biao.Zircon SHRIMP U-Pb dating of the Fanshan potassic alkaline ultramafite-syenite complex in Hebei Province, China[J].Acta Petrologica Sinica,2009,25(3):588-594. |
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| Authors: | REN Rong MU BaoLei HAN BaoFu ZHAO Lei CHEN JiaFu XU Zhao and SONG Biao |
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| Institution: | Key Laboratory of Orogenic belts and Crustal Evolution,MOE, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogenic belts and Crustal Evolution,MOE, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogenic belts and Crustal Evolution,MOE, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogenic belts and Crustal Evolution,MOE, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogenic belts and Crustal Evolution,MOE, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Key Laboratory of Orogenic belts and Crustal Evolution,MOE, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Beijing SHRIMP Center, Institute of Geology, Beijing 100037, China |
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| Abstract: | As one of alkaline intrusives in northern margin of the North China block, the Fanshan potassic ultramafite-syenite complex in Hebei Province contains the largest endogenous magnetite-apatite deposit of China. However, the pre-existing K-Ar, Rb-Sr and Sm-Nd ages are so different that more precise dating is very important to constrain the timing of the Fanshan complex. This study reports a SHRIMP zircon U-Pb age of 218±2Ma from a pyroxene syenite sample. Because the dated sample was collected from the main part of the complex, which was produced by the last (third-stage) pulse of magmatism, the zircon U-Pb age provides a strong constraint on the timing of the Fanshan complex. This is consistent with the zircon U-Pb ages from the literature for other alkaline intrusives in northern, eastern, and southern margins of the North China block, indicating that the alkaline magmatism at around 220Ma is one of the most important tectonomagmatic events in eastern China. |
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| Keywords: | Alkaline intrusive Ultramafite-syenite Zircon SHRIMP U-Pb dating Fanshan complex |
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