Rare earth geochemistry in the dissolved, suspended and sedimentary loads in karstic rivers, Southwest China

被引：0
作者：
Yongbin Jiang
Hongbing Ji
机构：
[1] Chinese Academy of Sciences,State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry
[2] Anhui University of Technology,Department of Environment Engineering, School of Construction Engineering
[3] University of Science & Technology Beijing,School of Civil and Environmental Engineering
[4] Capital Normal University,College of Resource Environment and Tourism
来源：
Environmental Earth Sciences | 2012年 / 66卷
关键词：
Rare earth elements; Dissolved load; SPM; Sediment; Karst;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The watershed in the central Guizhou Province (Guizhou Province is called simply Qian) (CQW) is a karstic area. Rare earth elements (REEs) of dissolved loads, suspended particulate material (SPM) and sediments of riverbed are first synthetically reported to investigate REE geochemistry in the three phases in karstic watershed during the high-flow season. Results show that the low dissolved REE concentrations in the CQW are attributed to these rivers draining carbonate rocks. The dissolved REE have significant negative Eu anomaly and coexistence of middle and light REE (MREE—PAAS-normalized LaN/SmN and GdN/YbN; LREE—PAAS-normalized LaN/YbN)-enrichment, which are due to the dissolution of impure Triassic carbonates. REE concentrations in most of SPM exceed that of sediments in the CQW and the average continental crust (UCC). The SPM and the sediments show some common features: positive Eu, Ce anomalies, and MREE enrichment. The controls on the patterns seem to be from weathering profiles: the oxidation state, the REE-bearing secondary minerals (cerianite, potassium feldspar and plagioclase), which are also supported by the evidence of Y/Ho fractionations in the three phases.
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页码：2217 / 2234
页数：17
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