| 福建上杭盆地发现3.4 Ga碎屑锆石 |
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| 关键词:detrital zircon Precambrian geology Cathaysia Block Shanghang basin Fujian Province |
| 基金项目:国土资源部公益性行业科研专项(编号: 200911007-1-17) |
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| The Discovery of 3.4 Ga Detrital Zircon in Shanghang Basin of Fujian Province |
| The detrital zircons have become one of the major tools for the study of regional geological evolution. In this paper, the authors conducted the LA-MC-ICP-MS U-Pb dating and Hf isotopic analysis for the detrital zircons from the conglomerate-bearing quartz sandstone occurring in the basal part of the Shanghang basin in Cathaysia Block. It is shown that these detrital zircons are magmatic in origin. The age data obtained from these detrital zircons range from 3 403 Ma to 328 Ma, which document at least 10 magmatic events in the region, indicating a long and complex geological evolution. Similar to ages of the detrital and captured zircons in other regions of the Cathaysia Block, the ages of the detrital zircons from the Shanghang basin reveal the global events, such as the Neoarchean–Paleoproterozoic crustal growth event, the assembly and breakup of supercontinents Columbia and Rodinia, and the assembly of Gondwana as well as regional events, such as the Early Paleozoic intense intraplate orogeny (Wuyi–Yunkai orogeny) with the characteristics of the Cathaysia Block. The most prominent 450 Ma peak indicates that the Caledonian orogeny (locally called Wuyi–Yunkai orogeny or Kwangsian orogeny) is the most important event in the region. The in situ Hf isotope compositions give a large range of εHf(t) values (?27.2 to 19.8) with two-stage model ages (tDM2) of 1 124~3 979 Ma (peak of 1 800~ 1 900 Ma). The Hf data suggest that the early magmatism was mainly associated with the large scale crustal growth, while the late one was related to the reworking of the early crust, involving the recycling of older crustal components with less juvenile crustal growth. |
| JIANG Si-hong,LIANG Qing-ling,WANG Shao-huai,ZHANG Li-li,LIU Chun-hua,LIU Yi-fei.2016.The Discovery of 3.4 Ga Detrital Zircon in Shanghang Basin of Fujian Province[J].Acta Geoscientica Sinica,37(5):645-656. |
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