| 登封群的定年及其划分问题的探讨 |
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| 引用本文：薛良伟,张天义,徐莉,卢欣祥.2004.登封群的定年及其划分问题的探讨[J].地球学报,25(2):229-234. |
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| 基金项目:河南省科技重点攻关项目(0123031400) |
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| 中文摘要:对登封群人们先后采用过K—Ar、Rb-Sr、U—Pb、单颗粒锆石Pb-Pb、Sm—Nd等多种同位素定年方法。由于不同方法得到的结果差别很大，直接影响了对登封群的认识，因而对登封群出现了多种划分方案。本文综合分析后认为，登封群花岗-绿岩地体形成于新太古宙末期(2500～2600Ma)，难以划分出元古代的地层单元。另外，对已有的同位素测年成果使用上要结合样品的地质、地球化学特征进行具体分析，才能得出合理的解释。 |
| 中文关键词:同位素定年 新太古宙 登封群 华北克拉通 |
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| A Discussion on the Classification and Dating of the Dengfeng Group |
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| Abstract:Different isotopic dating methods such as K-Ar,Rb-Sr,U-Pb (including the single grain zircon Pb-Pb dating) and Sm-Nd have been used to identify Denfeng Group.As different methods yield remarkably different dating results,there exist several schemes for classification of Dengfeng Group. Such a situation directly hinders the further study of Denfeng Group. Based on a comprehensive analysis,this paper holds that the granite-greenstone terrain of Dengfeng Group was formed at the end of Neoarchean (2 500～2 600 Ma),and that it is difficult to divide the stratigraphic units of Proterozoic.In addition,the results of isotopic dating should be used with care.In order to obtain a reasonable interpretation,the utilization of the isotopic dating results should be combined with a comprehensive analysis of the geological and geochemical characteristics of the samples. |
| keywords:isotopic dating Neoarchean Dengfeng Group North China Craton |
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