| 辽宁鞍山地区东山杂岩带3.3~3.1 Ga期间的岩浆作用——锆石SHRIMP U-Pb定年 |
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| 引用本文： | 周红英,刘敦一万渝生.辽宁鞍山地区东山杂岩带3.3~3.1 Ga期间的岩浆作用——锆石SHRIMP U-Pb定年[J].地质通报,2008,27(12). |
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| 作者姓名： | 周红英 刘敦一万渝生 |
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| 作者单位： | 1. 中国地质调查局天津地质矿产研究所,天津,300170
2. 中国地质科学院地质研究所,北京离子探针中心,北京100037 |
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| 基金项目： | 国土资源部重点项目（编号：121201071815）和北京离子探针中心基础研究项目 |
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| 摘 要： | 报道了鞍山地区东山杂岩带奥长花岗岩和二长花岗岩的锆石SHRIMP U-Pb年龄。中粗粒奥长花岗岩中岩浆锆石的年龄为3329 Ma ± 22 Ma (MSWD=9.6)，存在年龄为3687~3784 Ma的残余锆石。细粒奥长花岗岩和二长花岗岩中岩浆锆石的年龄分别为3141 Ma ± 8 Ma (MSWD=1.5)和3142 Ma ± 5 Ma (MSWD=0.35)。研究表明，约~3.3 Ga和3.1 Ga是鞍山地区2个重要的地壳演化阶段。
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| 关 键 词： | 太古宙 辽宁鞍山地区 锆石SHRIMPU-Pb定年 花岗岩 |
3.3-3.1 Ga magmatism in the Dongshan Complex, Anshan area, Liaoning, China: Evidence from SHRIMP U-Pb zircon dating. |
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| ZHOU Hong-ying,LIU Dun-yi WAN Yu-sheng.3.3-3.1 Ga magmatism in the Dongshan Complex, Anshan area, Liaoning, China: Evidence from SHRIMP U-Pb zircon dating.[J].Geologcal Bulletin OF China,2008,27(12). |
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| Authors: | ZHOU Hong-ying LIU Dun-yi WAN Yu-sheng |
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| Institution: | ianjin Institute of Geology and Mineral Resources, CGS |
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| Abstract: | This paper reports SHRIMP U-Pb zircon ages of granitoids from the Dongshan Complex in the Anshan area, where there are Archean rocks with ages ranging from 3.8 to 2.5 Ga. A medium-coarse-grained trondhjemite sample has a 207Pb/206Pb weighted mean age of 3329 ± 22 Ma (MSWD=9.6) on magmatic zircons, with inherited zircons of 3687-3784 Ma. Magmatic zircons from fine-grained trondhjemite and adamellite samples have weighted mean 207Pb/206Pb ages of 3141 ± 8 Ma (MSWD=1.5) and 3142 ± 5 Ma (MSWD=0.35), respectively. The ~3.3 Ga medium-coarse grained trondhjemite was formed by anatexis of 3.8 Ga trondhjemiteic rocks. The 3.14 Ga fine-grained trondhjemite is considered to be a veinlet emanated from the nearby Lishan trondhjemite body with the same age. The 3.14 Ga adamellite cuts the fine-grained trondhjemite and is derived from continental material. Combined with early researches, it is indicated that ~3.3 Ga and ~3.1 Ga are two important crustal evolution stages in the Anshan area. |
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| Keywords: | Archean Anashan area Liaoning Province zircon SHRIMP U-Pb dating Granite |
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