| 福建武平地区桃溪群混合岩U-Pb定年及其Hf同位素组成:对桃溪群时代及郁南运动的约束 |
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| 引用本文： | 张爱梅,王岳军,范蔚茗,张菲菲,张玉芝.福建武平地区桃溪群混合岩U-Pb定年及其Hf同位素组成:对桃溪群时代及郁南运动的约束[J].大地构造与成矿学,2011,35(1):64-72. |
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| 作者姓名： | 张爱梅 王岳军 范蔚茗 张菲菲 张玉芝 |
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| 作者单位： | 张爱梅,张菲菲,张玉芝,ZHANG Aimei,ZHANG Feifei,ZHANG Yuzhi(中国科学院,广州地球化学研究所,同位素年代学及地球化学重点实验室,广东,广州,510640;中国科学院,研究生院,北京,100049);王岳军,范蔚茗,WANG Yuejun,FAN Weiming(中国科学院,广州地球化学研究所,同位素年代学及地球化学重点实验室,广东,广州,510640) |
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| 基金项目： | 中国科学院知识项目,973项目,国家自然科学基金 |
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| 摘 要： | 桃溪群混合岩位于南岭东段武夷山褶皱带南段.本文通过采自桃溪附近帽村-田园两个代表性花岗片麻岩样品进行LA-ICP-MS锆石U-Pb 测年获得494～496Ma的结晶年龄,641～657Ma和799Ma两组继承锆石的206Pb/238U 表观年龄.同时对样品FJ-137进行的Hf同位素测定表明其εHf(t)变化于-2.3...
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| 关 键 词： | LA-ICP-MS锆石U-Pb定年 Hf同位素组成 桃溪群 郁南运动 |
LA-ICPMS Zircon U-Pb Geochronology and Hf Isotopic Composition of the Taoxi Migmatite(Wuping):Constrains on the Formation Age of the Taoxi Complex and the Yu'nanian Event |
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| ZHANG Aimei,WANG Yuejun,FAN Weiming,ZHANG Feifei,ZHANG Yuzhi.LA-ICPMS Zircon U-Pb Geochronology and Hf Isotopic Composition of the Taoxi Migmatite(Wuping):Constrains on the Formation Age of the Taoxi Complex and the Yu'nanian Event[J].Geotectonica et Metallogenia,2011,35(1):64-72. |
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| Authors: | ZHANG Aimei WANG Yuejun FAN Weiming ZHANG Feifei ZHANG Yuzhi |
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| Institution: | ZHANG Aimei1,2,WANG Yuejun1,FAN Weiming1,ZHANG Feifei1,2 and ZHANG Yuzhi1,2(1.CAS Key Laboratory of Isotope Geochronology and Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,Guangdong,China,2.Graduate University of Chinese Academy of Sciences,Beijing 100049,China) |
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| Abstract: | This paper presents LA-ICPMS zircon U-Pb geochronology and Hf isotopic composition for two migmatitic and gneissic samples from the Taoxi Complex at the Aocun-Tianyuan areas (Wuping). Zircons from the two samples (FJ-137 and FJ-138) yield the weighted mean 206Pb/238U ages of (496±4) Ma (n=8) and (494±6)Ma (n=17),respectively,which are interpreted as the formation age. Some grains give Neoproterozoic ages (641~657Ma and 799Ma),which can be considered to be inherited grains. The Hf isotopic compositions for FJ-137 sample range from-2.3 to-18.2 with the Hf model age of 1.84~2.65Ga. Our results along with other geological data,show that (1) the Mesoproterozoic Taoxi "Group" is most likely to be the Complex;(2) these rocks probably represent the products of the reworked Neoproterozoic-early Paleozoic sedimentary sequences; (3) the 494~496Ma magmatism in the Wuping area might be correlated with the Yu'nanian orogenic event that were previously discussed in other studies. |
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| Keywords: | LA-ICP MS zircon U-Pb dating Hf isotopic composition Taoxi Complex Yu'nanian event |
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