Abstract
The results of REE leached by some organic acids with various concentrations and water/rock ratios for different durations from a mixed sample of the weathering crust of a granite in Gonghe, Guangdong, China, showed that: 1) the contents of REE leached increase with increasing concentrations of the organic acids; 2) the contents of REE leached by 0.01 mol/L organic acids increase with increasing water/rock ratio; 3) the interaction between the organic acids and the samples enhances the pH value of the medium and the contents of REE leached tend to increase with decreasing pH value; and 4) compared with those leached by ammonia sulfate, the REE leached by the organic acids are characterized by a weaker negative Ce anomaly, a stronger negative Eu anomaly, and lower (La/Sm)N and (Gd/Yb)N ratios, indicating that the organic acids have made contributions to the fractionation of REE in the weathering crust.
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References
Banfield, J.F. and R.A. Eggleton, 1989, Apatite replacement and rare earth mobilization, fractionation, and fixation during weathering: Clays and Clay Minerals, v. 37, p. 113–127.
Chen Binghui, Wang Zhimei, Huang Limei, Wu Fuhai, Chen Jingde, and Xu Wenlie, 2000, An experimental study on the effects of microbes on migration and accumulation of REE in the weathering crust of granites: Chinese Journal of Geochemistry., v. 19, n. 3, p. 280–288.
Chen Binghui and Yu Shoujun, 1995, The weathering crust and REE metallogenic characteristics of granite in Pingyuan, Guangdong: Journal of Zhongshan University, v. 34, n. 1, p. 96–101 (in Chinese with English abstract).
Chen Deqian and Wu Jingshu, 1990, Metallogenic mechanism of the ion-type REE deposits: J. Chin. RE. Soc., v. 8, n. 2, p. 175–179 (in Chinese).
Chen Zhicheng, Chen Dahui, Wang Cuiwei, and Chen Shaoci, 1995, REE biological metallogeny—A preliminary study: Chinese Journal of Geochemistry, v. 14, n. 4, p. 346–352.
Chen Zhicheng, Yu Shoujun, Fu Qunce, Chen Binghui, and Zhang Lijie, 1998, Organic metallogeny of weathering crust RE deposits: J. Rare Earths, v. 16, n. 1, p. 60–67.
Condie, K.C., J. Dengate, and R.L. Cullers, 1995, Behavior of rare earth elements in a paleoweathering profile on granodiorite in the Front range, Colorado, USA: Geochim. et Cosmochim. Acta, v. 59, n. 2, p. 279–294.
Dubby, L. R., 1980, Redistribution and fractionation of rare-earth and other elements in a weathering profile: Chem. Geol., v. 30, n. 4, p. 363–381.
Ehrlish, H.L., 1998, Geomicrobiology: its significance for geology: Earth Science Reviews, v. 45, p. 45–60.
Gouveia, M.A., M.I. Prudencio, M.O. Figueiredo, L.C.J. Pereira, J.C. Waernborgh, I. Morgado, T. Pena, and A. Lopes, 1993, Behaviour of REE and other trace and major elements during weathering of granitic rocks, Evora, Portugal: Chem. Geol., v. 107, p. 293–296.
Leroy, J.L. and L. Turpin, 1988, REE, Th and U behaviour during hydrothermal and supergene processes in a granitic environment: Chem. Geol., v. 68, p. 239–251.
Lin Chuanxian and Zheng Zuoping, 1994, Experimental studies on metallogenic mechanism of weathering crustleaching REE deposits in South China: Geochimica, v. 23, n. 2, p. 189–198 (in Chinese with English abstract).
Middleburg, J.J., C.H. Van der Weijden, and J.R.W. Woittiez, 1988, Chemical processes affecting the mobility of major, minor and trace elements during weathering of granitic rocks: Chem. Geol., v. 68, p. 253–273.
Minarik, L., A. Zigova, J. Bendl, P. Skrivan, and M. Stastny, 1998, The behaviour of rare-earth elements and Y during the rock weathering and soil formation in the Ricany granite massif, Central Bohemia: The Science of the Total Environment, v. 215, n. 1–2, p. 101–111.
Nesbitt, H. W., 1979, Mobility and fractionation of rare earth elements during weathering of a granodiorite: Nature, v. 279, n. 17, p. 206–210.
Song Yunhua and Shen Lipu, 1986, REE geochemistry of the weathered crust of acid volcanic rocks—An experimental study: Geochimica, n. 3, p. 225–234 (in Chinese).
Taunton, A.E., S.A. Welch, and J. F. Banfield, 2000, Geomicrobiological controls on light rare earth element, Y and Ba distributions during granite weathering and soil formation: Journal of Alloys and Compounds, v. 303-304, p. 30–36.
Wang Zhonggan, Yu Xueyuan, and Zhao Zhenhua, 1989, Geochemistry of rare earth elements: Beijing, Science Press, p. 321–342 (in Chinese).
Wu Chengyu, Huang Dianhao, and Guo Zhongjun, 1989, Geochemistry of REE in the weathering crust of granites in Longnan, Jiangxi: Acta Geologica Sinica, v. 63, n. 4, p. 349–362 (in Chinese with English abstract).
Yang Xueming, Yang Xiaoyang, Zhang Peishan, Zhang Wanglong, and Tao Kejie, 1999, Geochemical study of REE from granite weathering crusts in Dajishan of Jiangxi Province: Chinese Rare Earths, v. 20, n. 1, p. 1–5 (in Chinese with English abstract).
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This work was granted by the Natural Science Foundation of Guangdong Province, China (Grant Nos. 960042, 990232).
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Chen, B., Wu, F. & Liu, F. Experimental study on the effects of organic acids on the dissolution of REE in the weathering crust of granite. Chin. J. of Geochem. 20, 144–151 (2001). https://doi.org/10.1007/BF03165996
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DOI: https://doi.org/10.1007/BF03165996