| 中国太古宙 |
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| 引用本文： | 孙大中.中国太古宙[J].地球化学,1998,27(4):309-318. |
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| 作者姓名： | 孙大中 |
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| 作者单位： | 中国科学院广州地球化学研究所!广州，510640 |
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| 摘 要： | 根据最近10多年来中国太古宙岩石同位素地质年代学新数据和中国太古宙岩石三个主要分布地区冀东、辽东和吉林南部、太行山-五台山的时间-地层图及其对比情况，认为尚无足够的证据支持中国太古宙四分，三分方案更适合于中国太古宙的情况：约2．9Ga可以作为晚、中太古代的界线，而3.5Ga作为中、早太古代界线尚不很明晰。
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| 关 键 词： | 太古宙 同位素年龄 中国 地层时代划分 |
THE ARCHEAN IN CHINA |
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| Sun Dazhong.THE ARCHEAN IN CHINA[J].Geochimica,1998,27(4):309-318. |
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| Authors: | Sun Dazhong |
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| Abstract: | A number of isotopic ages dated for the Chinese Archean rocks were obtained since the middle of 1980s. More reliable ages indicate the bine range from 3.8Ga to 2.5Ga. These ages mainly locate in three ranges: (i) from ~2.5Ga to 2.7Ga. (ii) from 2.9Ga to 3.2Ga. and (iii) from 3.4Ga to 3.8Ga. The age data from 2.8Ga to 2.9Ga are few and unreliable. Compared with the Arehean cases of other places all over the world, the Chinese Archean has its own particularities. According to the proposal of SPS, time units and their geochronometeric boundaries are selected by the total geological record displayed by the comprehensive time-stratigraphic charts. In view of the geological and geochronological data and comparison of the three major Archean time-stratigraphic charts of (i) E Hebei, (ii) E Liaoning & S Jinn, and (iii) Taihang and Wutai Mountains, the boundaries of 3.5Ga and 2.9Ga could be selected for subdivision of the Archean in the North China Craton. No sufficient evidences are available for supporting four subdivision of the Chinese Arehean until now. Three subdivision scheme might be more suitable to the case of the Chinese Archean, in which the ca. 2.9Ga boundary between middle Archean and late Archean could be essentially determined, but the boundary of 3.5Ga betWeen early Arehean and middle Archean is indistinct according to the age data from all over Chinese Arehean rocks up to now. |
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| Keywords: | Arehean isotopic age China strahgraphic-time subdivision scheme |
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