PDF Publication Title:
Text from PDF Page: 256
220 Handbook on the Physics and Chemistry of Rare Earths Hill Basin A zone B zone C zone D zone E zone Surface soil Organic matter rich Strongly weathered Clay-rich Moderately weathered Clay-rich Potentially ore body Weakly weathered Basement rock FIG. 42 Schematic model of ion-adsorption ore bodies in southern China. Modified after Yang, Y.Q., Hu, Z.S., Luo, Z.M., 1981. Geological characteristics of mineralization of rare earth deposits of the ion-adsorption type and their prospecting direction. Bull. Inst. Miner. Depos. Chin. Acad. Geol. Sci. 2, 102–118 (in Chinese with English abstract); Zhang, Z.H., 1990. A study on weathering crust ion adsorption type REE deposit, South China. Contrib. Geol. Miner. Resour. Res. 5, 57–71 (in Chinese with English abstract); Wu, C.Y., Huang, D.H., Guo, Z.G., 1990. REE geochemistry in the weathered crust of granites, Longnan area, Jiangxi Province. Acta Geol. Sin. 3, 193–210. 2005, 2012; Pan, 2011; Song and Shen, 1986; Tong, 2013; Wu et al., 1990, 1993a,b, 1996; Yang, 1987; Yang et al., 1981; Zhang, 1990). The REE con- tents of parent rocks range generally from 130 to 810 ppm (Bao and Zhao, 2008; Chen, 2013; Hua et al., 2007; Huang, 1989; Huang et al., 1989; Ishihara et al., 2008; Li and Shen, 2013; Luo, 2011; Ma et al., 1991; Pan, 2011; Wu et al., 1993b; Yang et al., 1999), and the higher REE contents are found in LREE-rich alkaline rocks (Bao and Zhao, 2008; Hua et al., 2007; Huang, et al., 1989). REE grades of ion-adsorption ores range widely from 140 up to 6500 ppm (Bao and Zhao, 2008; Chen, 2013; Hua et al., 2007; Li and Li, 2010; Li and Shen, 2013; Murakami and Ishihara, 2008; Pan, 2011; Tong, 2013; Wu et al., 1990; Yang and Xiao, 2011; Yang et al., 1981, 1999; Zhang, 1990), and they are up to 6 times of the REE contents of parent granites (Bao and Zhao, 2008; Huang et al., 1989; Wu et al., 1990; Yang and Xiao, 2011). The LREE/HREE ratios of the ion-adsorption deposits are variable from HREE-rich deposits (eg, Longnan) to LREE-rich deposits (eg, Heling) (Zhu, 1999). The LREE/HREE ratios of ion-adsorption ores con- strained by those of parent granites, ie, HREE-rich ores are derived from HREE-enriched (low LREE/HREE ratio) parent granites. The REE-enriched zone is typically below the REE-depleted zone (Wu et al., 1990; Yang et al., 1981; Zhang, 1990) because soil water dissolving REE3+ ions move downward in a weathering profile. In some weathering pro- files (Fig. 40B and C), the REE-enriched zone is found near the surface above the REE-depleted zone because the weathered granite is more or less eroded. Degree of weatheringPDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
PDF Search Title:
HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHSOriginal File Name Searched:
Chemistry-Rare-Earths-49.pdfDIY PDF Search: Google It | Yahoo | Bing
Sulfur Deposition on Carbon Nanofibers using Supercritical CO2 Sulfur Deposition on Carbon Nanofibers using Supercritical CO2. Gamma sulfur also known as mother of pearl sulfur and nacreous sulfur... More Info
CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
| CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com | RSS | AMP |