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Lu L.,Chinese Academy of Geological Sciences | Zhao Y.-Y.,Chinese Academy of Geological Sciences | Wang X.-L.,Shenyang Institute of Geology and Mineral Resources | Liu J.-P.,Metallurgical and Mining Company of Shaanxi Province
Geological Bulletin of China | Year: 2014

The determination of geochemical baseline in an ore concentration area is the basic task for investigating and evaluating the mine environmental geology, and the selection of appropriate method for calculating geochemical baseline is the key to this problem. With the topsoil in the Dexing copper ore concentration area as the research object, the authors employed geochemical comparison method, relative cumulative frequencies method and normalization procedure to calculate geochemical baselines of six heavy metals in the topsoil in the study area. Then, these geochemical baselines were compared with geochemical backgrounds of Jiangxi Province. In addition, an analysis was made in the light of heavy metal content of mother rocks. It is concluded that the geochemical baseline determined by normalization procedure is the relatively suitable one. Source


Lu L.,Chinese Academy of Geological Sciences | Zhao Y.-Y.,Chinese Academy of Geological Sciences | Liu J.-P.,Metallurgical and Mining Company of Shaanxi Province
Geological Bulletin of China | Year: 2014

In 2004 and 2011, 140 environmental media samples were collected along the Dawu River of the Dexing copper mine in Jiangxi Province and analyzed for Cu. On the basis of the national standard, the spatial-temporal variation of Cu regional environment contamination and the source of heavy metals in plants were studied during the seven years. The results show that the samples whose values exceeded the national standard were mostly distributed at the source (70.3%) and in the upstream area (90.9%) of the Dawu River. Except for the surface water and soil, the trend of Cu in environmental media in 2004 and 2011 was on the whole worsening. And the cabbage whose content of Cu element in 2011 was 11.68 times that in 2004 seemed to be the obvious environmental media. There existed obvious differences of the variation regularity between plants and other environmental media such as surface water and soil. It is inferred that the source of Cu in plants has close relation with atmospheric deposition. Source


Zhao Y.-Y.,Chinese Academy of Geological Sciences | Wang X.-L.,China University of Geosciences | Wang X.-L.,Shenyang Institute of Geology and Mineral Resources | Zhao X.-T.,CAS Institute of Geology and Geophysics | And 3 more authors.
Acta Geoscientica Sinica | Year: 2014

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. Source


Liu J.-P.,Metallurgical and Mining Company of Shaanxi Province | Zhao Y.-Y.,Chinese Academy of Geological Sciences | Lu L.,Chinese Academy of Geological Sciences
Geological Bulletin of China | Year: 2014

The Dexing copper mine is a superlarge porphyry copper deposit in Jiangxi Province. With the increasing mining activities, the environmental problem of heavy metals pollution have become more and more serious in the Dexing copper ore district. In order to improve the quality of the soil environment of the Dawu River in the Dexing copper ore district, the accumulation effect of heavy metal elements and the reasons should be understood. The authors selected three sections in upstream, midstream and downstream areas of the Dawu River, collected 50 samples, calculated the accumulation rate of heavy metal elements based on geochemical baseline and, on such a basis, revealed the accumulation characteristics. Generally speaking, the accumulation of Cu and Mo is important and clear, and the cumulative effect of Cr and As is obvious on the first- and second-order terraces of Dawu river basin, where the accumulation effect of heavy metals is remarkable. The authors also analyzed the factors responsible for the accumulation of heavy metals in the aspects of mineral association, geological setting, river terraces, topography, elemental speciation and mining process. Source


Zhao Y.-Y.,Chinese Academy of Geological Sciences | Zhang J.-W.,Chinese Academy of Geological Sciences | Guo K.,Chengdu University of Technology | Liu J.-P.,Metallurgical and Mining Company of Shaanxi Province | Lu L.,Chinese Academy of Geological Sciences
Geological Bulletin of China | Year: 2014

When evaluating the heavy metal content of soils and crops in the Dexing copper mine by using a single exceeded index, the authors found that excessive heavy metals in soil and in crop are not inconsistent with each other. Pb and Cd are not or rarely excessive in soil, but they seriously exceed the set standard in crops. In order to solve this mismatch phenomenon, the authors, on the basis of National Food Hygiene Standards, proposed the method of soil heavy metals risk threshold based on crop safety and determined the risk threshold in farmland soils of the Dexing copper mine. This method overcomes the shortcomings of the deviation of the standard-surpassing boundary and the unitary soil consideration during the evaluation based on National Standards and hence can be more flexibly used in agricultural production. Source

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