| 扬子克拉通早太古代地壳物质的锆石同位素证据 |
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| 关键词:zircon U-Pb dating Hf isotopes O isotopes Early Archean Yangtze csaton |
| 基金项目:本文为国家自然科学基金项目（编号：40334036)资助成果。 |
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| 摘要: |
| Zircon Isotope Evidence for ≥3.5 Ga Continental Crust in the Yangtze Craton |
| The presence or absence of Early Archean crust in different continents provides an important basis for the comparison of their growth histories. Since the discovery of ca. 3.8 Ga detrital zircon in the North China craton by means of SHRIMP U-Pb dating, the question has cropped up whether the Yangtze craton, one of the two major blocks constituting the basement of China continent, also contains Early Archean crustal relicts. It is generally accepted that the basement of the Yangtze craton was mainly formed in Paleoproterozoic, with only minor Archean rocks aged 2.5~3.3 Ga. A combined study of zircon U-Pb dating and Hf isotope analyses of Kongling migmatite from this craton reveals the existence of ≥3.5 Ga rocks. This provides the fast evidence for the existence of Early Archean (≥3.5 Ga) rocks in the Yangtze craton. Thus the early evolutionary history of the Yangtze craton may resemble that of the North China craton that has crustal relicts with the minimum age of 3.5 Ga. These Early Archean rocks bad resided in the crust of the Yangtze craton for at least hundreds of million years before remelting, probably leaving。clues to be traced and verified. |
| MANG Shaobing,MENG Yongfei,WU Yuanbao.2005.Zircon Isotope Evidence for ≥3.5 Ga Continental Crust in the Yangtze Craton[J].Acta Geoscientica Sinica,26(z1):109-111. |
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