| 江西九江中更新世红土物质来源研究 |
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| 关键词:red earth Middle Pleistocene Jiujiang Zircon U-Pb age |
| 基金项目:国家自然科学基金项目(编号: 41972212);湖北省楚天学者人才项目(编号: 8210403);土木工程防灾减灾湖北省引智创新示范基地(编号: 2021EJD026) |
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| Provenance Tracing of Middle Pleistocene Red Earth in the Jiujiang Area, Jiangxi Province |
| The Middle Pleistocene red earth is widely distributed in South China. However, its source areas remain controversial. The sedimentary age of the Jiujiang red earth profile has been defined well in previous studies, and it is an ideal region for studying the source of the red earth material in the Middle Pleistocene due to its continuous deposition and good exposure. Through the analysis of two detrital zircon samples from the Middle Pleistocene red earth in Jiujiang, we obtained 177 concordant zircon U-Pb ages. The peak ages are mainly concentrated in the Neoproterozoic (816 Ma, 801 Ma, and 991 Ma), Paleoproterozoic (2019 Ma, 2022 Ma, and 2481 Ma), and Neoarchean (2502 Ma), with an insignificant peak age in the Mesozoic (135 Ma). The results show that the Gobi Desert, northern deserts, Loess Plateau, Tarim Basin, and North China Plain in northern China are not the main source regions of the Middle Pleistocene red earth in Jiujiang. The Early Pleistocene diluvial fan at the northern piedmont of Lushan Mountain provided sufficient materials for development of the Middle Pleistocene red earth in Jiujiang. The detrital zircon U-Pb age compositions of the Middle Pleistocene red earth are different from those of the Late Pleistocene loess in Jiujiang. Different climatic conditions dominated the development of the red earth in the Middle Pleistocene and the loess in the Late Pleistocene in the Jiujiang area, but both of them were sedimentary responses to environmental changes caused by the tectonic uplift of the Tibetan Plateau. |
| LIN Xu,HU Cheng-wei,WU Zhong-hai,ZHAO Xi-tao,CHEN Ji-xin,LI Ling-ling.2023.Provenance Tracing of Middle Pleistocene Red Earth in the Jiujiang Area, Jiangxi Province[J].Acta Geoscientica Sinica,44(3):511-521. |
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