Dissolved rare earth elements in rivers draining karst terrain in Guizhou Province, SW China

2006 ◽  
Vol 70 (18) ◽  
pp. A226 ◽  
Author(s):  
G.L. Han ◽  
C.-Q. Liu
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Guizhou Province ◽  
Karst Terrain ◽  
Sw China

Genesis for Rare Earth Elements Enrichment in the Permian Manganese Deposits in Zunyi, Guizhou Province, SW China

2020 ◽  
Vol 94 (1) ◽  
pp. 90-102
Author(s):  
Hai XU ◽  
Junbo GAO ◽  
Ruidong YANG ◽  
Lijuan DU ◽  
Zhichen LIU ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Guizhou Province ◽  
Sw China ◽  
Manganese Deposits

scholarly journals Anthropogenic Rare Earth Elements: Gadolinium in a Small Catchment in Guizhou Province, Southwest China

2019 ◽  
Vol 16 (20) ◽  
pp. 4052 ◽  
Author(s):  
Jue Zhang ◽  
Zhuhong Wang ◽  
Qixin Wu ◽  
Yanling An ◽  
Huipeng Jia ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Guizhou Province ◽  
Weak Reaction ◽  
Small Catchment ◽  
Small Stream ◽  
Small Streams ◽  
Gd Anomaly

Rare earth elements (REEs), known as “industrial vitamins”, are widely used in medical treatment, industry, agriculture, etc. However, with the increasing demand for REEs, excess REEs, such as gadolinium (Gd), are considered micropollutants in the environment. In this paper, the distributions of dissolved REEs were analyzed in three small streams, in order to determine the extent and occurrence of Gd anomalies. The shale-normalized REE patterns in the three streams were less smooth with heavy REEs higher than light REEs, for a weak reaction of the heavy REE complexes. A negative Ce (cerium) anomaly and positive samarium (Sm) and europium (Eu) anomalies were observed in the three streams and the negative Ce anomaly was affected by the pH of the alkaline rivers. However, a positive Gd anomaly was found in only a typical urban small stream, Jinzhong. With a population of approximately 60,000, Jinzhong runs by a hospital and through wastewater treatment plants (WWTPs). The concentrations of Gd in Jinzhong ranged from 1.54 to 86.65 ng/L with high anthropogenic Gd proportions (63.64%–98.07%). Anthropogenic Gd showed significant seasonal variations and distinct spatial disparities from upstream to downstream, and it was associated with certain ions such as Cl−. Anthropogenic Gd could be attributed to gadopentetic acid (Gd-DTPA), which is used in magnetic resonance imaging (MRI) in hospitals. This type of Gd was shown to be correlated with municipal wastewater. Due to the high stability and low particulate reactivity in water, anthropogenic Gd has great potential to serve as a tracer to prove the presence of medical wastewater.

Trace Elements and Rare Earth Elements of Sulfide Minerals in the Tianqiao Pb-Zn Ore Deposit, Guizhou Province, China

2011 ◽  
Vol 85 (1) ◽  
pp. 189-199 ◽  
Author(s):  
ZHOU Jiaxi ◽  
HUANG Zhilong ◽  
ZHOU Guofu ◽  
LI Xiaobiao ◽  
DING Wei ◽  
...  
Keyword(s):  
Trace Elements ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Sulfide Minerals ◽  
Guizhou Province ◽  
Ore Deposit

scholarly journals Genesis of the Xifeng Low-Temperature Geothermal Field, Guizhou, SW China: Constrains From Geology, Element Geochemistry, and D-O Isotopes

2021 ◽  
Vol 9 ◽  
Author(s):  
Yanyan Li ◽  
Ji Dor ◽  
Chengjiang Zhang ◽  
Guiling Wang ◽  
Baojian Zhang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Low Temperature ◽  
Rare Earth Elements ◽  
Meteoric Water ◽  
Hot Springs ◽  
Geothermal Field ◽  
Frictional Heat ◽  
Geothermal System ◽  
Sw China ◽  
Deep Circulation

The Xifeng geothermal field is located in the Yangtze Craton, SW China, and is one of the most representative low-temperature geothermal fields in China. Widespread thermal anomalies, hot springs, and geothermal wells have been reported by previous studies. However, the nature and forming mechanisms of the field remain poorly understood. Element geochemical (ions, rare earth elements) and stable isotopic (D, O) composition of hot springs, geothermal fluids, rivers, and cold springs from different locations of the Xifeng geothermal field were analyzed in this study. The ions studies revealed that most samples featured the Ca-Mg-HCO3 type, except Xifeng hot springs, and which were characterized by the Ca-Mg-HCO3-SO4 type. Based on quartz geothermometers, the estimated reservoir temperature was 77°C. The results of stable isotopes (D, O) manifest that the Xifeng geothermal system was recharged by meteoric water at an elevation of 1,583 m from SW to NE. The research of rare earth elements (REE) revealed that their accumulation characteristics and obvious positive Eu anomaly were inherited from host feldspar-bearing reservoir dolomites through water-rock interactions. Combined with these observations, geological setting, and previous studies, it was concluded that the formation of the Xifeng geothermal field resulted from recharge, deep circulation, and secondary rising of the meteoric water along the faults. First, meteoric water infiltrated to depth through faults and crack zones. Second, the deep-infiltrated water was heated by radioactive heat, deep heat, and tectonic frictional heat. Finally, as the warmed-up waters underwent considerable deep circulation in the reservoir, it rose again along the main faults, and mixed with groundwater near the surface. Taken together, we suggest that the Xifeng geothermal system should be assigned as a faults-controlling, and deeply circulating meteoric water of low-temperature category.

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