Ree Fractionation Between Scheelite and Apatite in Hydrothermal Conditions
(1993) The American Mineralogist (Print) : an international journal of earth and planetary materials — Vol. 78, n° 11-12, p. 1275-1285 (1993)
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- Abstract
- The geochemical analysis of hydrothermal apatite and scheelite pairs from various types of W ore deposits (skarns, disseminated scheelite, and quartz veins) provides an insight into REE partitioning between the two minerals. Among the 18 analyzed pairs, only five appear to have grown in equilibrium conditions. Ten other pairs show more or less important departures from equilibrium. The remaining apatite and scheelite pairs have quite different REE patterns, indicating crystallization from different fluids. Both minerals concentrate REE. The relative behavior of HREE and LREE is quite similar in the two minerals. Scheelite is only slightly more enriched in HREE relative to LREE than apatite, with K(ap-sch)La-Yb = 0.86 +/- 0.22. Beside these regularities, some dispersion in the lanthanide content ratios of apatite and scheelite, ranging from 0.6 to 5, may be related to fluid composition. The behavior of Eu can be related to redox conditions, which appear to be more oxidizing in vein associations than in skarn environments. Determination of REE in coexisting scheelite and apatite seems an efficient tool for identification of successive ore-bearing fluids.
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Raimbault, L., Baumer, A., Dubru, M., Benkerrou, C., Croze, V., & Zahm, A. (1993). Ree Fractionation Between Scheelite and Apatite in Hydrothermal Conditions. The American Mineralogist (Print) : an international journal of earth and planetary materials, 78(11-12), 1275-1285. https://hdl.handle.net/2078.5/146451 (Original work published 1993)