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REE concentration/chondrite 10−1 A Mid-oceanic ridge 10−1 B Backarc basin 10−1 C Backarc basin (acid fluids) 10−2 10−2 10−2 10−3 10−3 10−3 10−4 10−4 10−4 10−5 10−5 10−5 10−6 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu 10−6 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu 10−6 La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu FIG. 18 Chondrite-normalized REE patterns of hydrothermal fluids in comparison with the pattern of present seawater. (A) Mid-oceanic ridge fluids. (B) Backarc basin fluids at PACMANUS, eastern Manus Basin. (C) Backarc basin acid fluids at DESMOS and SuSu Knolls, eastern Manus Basin. Panel A: Data from Michard, A., Albarede, F., Michard, G., Minster, J.F., Charlou, J.L., 1983. Rare-earth elements and uranium in high-temperature solutions from the East Pacific Rise hydrothermal vent filed (13°N). Nature 303, 795–797; Michard, A., 1989. Rare earth element systematics in hydrothermal fluids. Geochim. Cosmochim. Acta 53, 745–750; Klinkhammer, G.P., Elderfied, H., Edomond, J.M., Mitra, A., 1994. Geochemical implications of rare earth element patterns in hydrothermal fluids from mid-ocean ridges. Geochim. Cosmochim. Acta 58, 5105–5113; Mitra, A., Elderfield, H., Greaves, M.J., 1994. Rare earth elements in submarine hydrothermal fluids and plumes from the Mid-Atlantic Ridge. Mar. Geol. 46, 217–235. Panel B: Data from Craddock, P.R., Bach, W., Seewald, J.S., Rouxel, O.J., Reeves, E., Tivey, M.K., 2010. Rare earth element abundances in hydrothermal fluids from the Manus Basin, Papua New Guinea: indicators of sub-sealoor hydrothermal processes in back-arc basins. Geochim. Cosmochim. Acta 74, 5494–5513. Panel C: Data from Craddock, P.R., Bach, W., Seewald, J.S., Rouxel, O.J., Reeves, E., Tivey, M.K., 2010. Rare earth element abundances in hydrothermal fluids from the Manus Basin, Papua New Guinea: indicators of sub-sealoor hydrothermal processes in back-arc basins. Geochim. Cosmochim. Acta 74, 5494–5513.PDF Image | HANDBOOK ON THE PHYSICS AND CHEMISTRY OF RARE EARTHS
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