| 赣东北乐安江德兴铜矿段河流阶地的发育及环境意义 |
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| 关键词:river terraces OSL dating Le’an River environmental significance Dexing orefield |
| 基金项目:国土资源部公益性行业科研专项“德兴铜矿集区地球化学环境累积效应与预警方法研究”(编号: 201111020-05)；“江西德兴斑岩铜矿科学基地研究”(编号: 200911007-01)；中国地质调查局地质矿产调查项目“钦杭成矿带中新生代岩浆-热液多金属成矿与靶区优选”(编号: 1212011085408)；国土资源部两权专项项目“矿产资源开发对环境的影响及整治示范研究”之子项目“矿床地质环境模型及环境评价”(编号: 303024082) |
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| Terraces Development of the Le’an River in the Dexing Copper Mine of Northeast Jiangxi and Its Environmental Significance |
| The Le’an River is the main stream in the Dexing copper orefield. The authors divided the terraces of the Le’an River and its branches and used OSL (Opically Stimulated Luminesecence) dating to confirm the formation age of low terraces so as to find out Le’an River terraces in the Dexing copper mine and its environmental effects. Some conclusions have been reached: There are five terraces of the Le’an River in the study area: T1 is between 6 to 15 m above the river level; T2 is between 12 to 22 m above the river level, T3 is between 28 to 40 m above the river level; T4 is between 20 to 30 m above the river level; T5 is 50 m above the river level. Besides, the Dawu River and the Fuxi River, two branches of the Le’an River, also have 3~5 terraces. OSL ages of T3 are (120.6±5.8)~(153.6±8.1) ka; OSL ages of T2 are (43.0±1.8)~ (109.9±4.6) ka; OSL ages of T1 are (0.9±0.1)~(1.2±0.1) ka, T4 was probably formed in the period just before the last interglacial period. The above understandings fill the gap in the study of Le’an River terraces and lay a certain foundation for the future study of the Quaternary geology. In combination with plant and soil heavy metal content in T1 and T2 of the Dawu River, the authors hold that the study of terraces of the Le’an River and its branches in the Dexing copper mine have great significance for confirming the influence range of acidic waste water discharged by the Dexing copper mine and agricultural regionalization. |
| ZHAO Yuan-yi,WANG Xiao-liang,ZHAO Xi-tao,LIU Jian-ping,LU Lu,YANG Yong-qiang.2014.Terraces Development of the Le’an River in the Dexing Copper Mine of Northeast Jiangxi and Its Environmental Significance[J].Acta Geoscientica Sinica,35(4):454-462. |
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