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http://www.igeodata.org/handle/20.500.11758/349
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DC 字段 | 值 | 语种 |
---|---|---|
所有者 | Shoujie Liu | - |
所有者 | Yusheng Wan | - |
所有者 | Huiyi Sun | - |
所有者 | Allen P. Nutman | - |
所有者 | Hangqiang Xie | - |
所有者 | Chunyan Dong | - |
所有者 | Mingzhu Ma | - |
所有者 | Dunyi Liu | - |
所有者 | Bor-ming Jahn | - |
获取日期 | 2017-03-07T03:36:44Z | - |
获取日期 | 2017-03-07T03:36:44Z | - |
首次发表日期 | 2013-08 | - |
引用地址 | http://www.igeodata.org/handle/20.500.11758/349 | - |
摘要 | In the Caozhuang complex in eastern Hebei, North China Craton, the Paleo- to Eoarchean crustal evolu- tion was earlier revealed by the preservation of detrital zircon grains older than (or as old as) 3.8 Ga in fuchsite-quartzite. In order to test if the Eoarchean antiquity is also preserved in rocks other than the fuchsite quartzite, we collected two paragneisses, a hornblende gneiss and a garnet–biotite gneiss, from Huangbaiyu village and dated their detrital zircon grains. The zircon dating of the hornblende gneiss yielded concordant 207 Pb/ 206 Pb ages ranging from 3684 to 3354 Ma. However, an older date of 3782 Ma with 18% discordancy was also obtained. Detrital zircon grains from the garnet–biotite gneiss gave a similar 207 Pb/ 206 Pb age range, from 3838 to 3342 Ma. The metamorphic domains of the zircon grains from both samples, including the strongly recrystallized cores and rims, recorded an overprinting metamorphism at ca. 2.5 Ga, which correlates with the most widespread tectono-thermal event in the North China Craton. In situ zircon Hf-isotope analyses on the dated zircon grains yielded a wide range of model ages (T DM1 ) from 4.0 to 3.3 Ga with corresponding e Hf(T) from ?36.0 to +4.8. This suggests that the evolution of the crustal segment in this area has involved multiple phases of juvenile crustal addition as well as recycling of older crustal rocks. The new geochronological results imply the presence of a sig- nificant amount of Eoarchean crustal fragments in the eastern Hebei area. The sedimentary protoliths of the paragneisses and other high-grade metamorphic rocks in the Caozhuang complex were probably deposited between 3.4 and 2.5 Ga. | zh_CN |
语种 | en | zh_CN |
出版者 | Institute of Geology Chinese Academy of Geological Sciences | zh_CN |
主题关键词 | Detrital zircon | zh_CN |
主题关键词 | Eoarchean | zh_CN |
成果名称 | Paleo- to Eoarchean crustal evolution in eastern Hebei, North China Craton: New evidence from SHRIMP U–Pb dating and in-situ Hf isotopic study of detrital zircons from paragneisses | zh_CN |
类型 | Book | zh_CN |
所属集合: | 科技成果 |
文件中的条目:
条目 | 描述 | 大小 | 格式 | |
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Paleo-to Eoarchean crustal evolution in eastern Hebei, North China.pdf | 4.24 MB | Adobe PDF |
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