| 北秦岭西段冥古宙锆石(4.1～3.9Ga)年代学新进展 |
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| 引用本文： | 第五春荣,孙勇,董增产,王洪亮,陈丹玲,陈亮,张红.北秦岭西段冥古宙锆石(4.1～3.9Ga)年代学新进展[J].岩石学报,2010,26(4):1171-1174. |
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| 作者姓名： | 第五春荣 孙勇 董增产 王洪亮 陈丹玲 陈亮 张红 |
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| 作者单位： | 大陆动力学国家重点实验室,西北大学地质学系,西安,710069 |
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| 基金项目： | 国家自然科学基金项目(40773044, 40902056)及西北大学大陆动力学国家重点实验室科技部专项联合资助 |
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| 摘 要： | 2007年王洪亮等报道在北秦岭西段火山岩中获得一粒年龄为4079±5Ma的冥古宙捕虏锆石。之后,对这一发现开展了深入的调查研究,我们除利用SHIMP技术方法对原4079Ma的锆石进行验证外,新获得了两粒~(207)Pb/~(206)Pb年龄为4007±29Ma和3908±45Ma捕获的变质成因锆石,表明早在4.0Ga已经有变质作用的发生,这或许说明在冥古宙时期地球已经具有相当规模和厚度的地壳。同时开展的岩石学研究表明,蕴含古老锆石的母岩属于火山碎屑熔岩类而不是火山熔岩。
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| 关 键 词： | 冥古宙 锆石 火山岩 北秦岭造山带 变质作用 |
| 收稿时间： | 2010/3/10 0:00:00 |
| 修稿时间： | 2010/3/30 0:00:00 |
In situ U-Pb geochronology of Hadean zircon xenocryst(4.1~3.9Ga) from the western of the Northern Qinling Orogenic Belt |
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| Diwu CR,Sun Y,Dong ZC,Wang HL,Chen DL,Chen L and Zhang H.In situ U-Pb geochronology of Hadean zircon xenocryst(4.1~3.9Ga) from the western of the Northern Qinling Orogenic Belt[J].Acta Petrologica Sinica,2010,26(4):1171-1174. |
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| Authors: | Diwu CR Sun Y Dong ZC Wang HL Chen DL Chen L and Zhang H |
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| Institution: | State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China;State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China;State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China;State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China;State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China;State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China;State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China |
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| Abstract: | One zircon xenocryst with a concordant 207Pb/206Pb age of 4079±5Ma was reported by Wang et al. (2007) from volcanic rocks in the western of the Northern Qinling Orogenic Belt. In recent study on those old xenocrysts, about 3,000 zircon grains are separated from the same rock outcrop and have been analyzed by LA-ICPMS. Two metamorphic zircon xenocrystic cores gave concordant 207Pb/206Pb ages of 4008±29Ma and 3908±45Ma, respectively. The occurrence of 4.0Ga metamorphic zircon provided evidence that the metamorphism occurred as old as 4008Ma. The lithologic characteristics of the host rocks contain Hadean zircons are clearly defined as pyroclastic lava, not volcanic lava, as previously believed. |
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| Keywords: | Hadean Zircon Volcanic rock Northern Qinling Orogenic Belt Metamorphism |
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