Abstract
The analysis of REE in tungsten ore bodies and surrounding rocks from Paleozoic schist-sandstone and limestone series in central Morocco shows two kinds of behaviour: (1) no significant modification of lanthanide distribution occurs during thermal and hydrothermal metamorphic events; and (2) important variations of REE patterns characterize highly infiltrated and mineralized samples corresponding to the mixing of scheelite and wall-rock spectra. A water/rock ratio of ∼2.4 is estimated for the paleogeothermal continental system. By comparison of REE patterns, hydrothermal mineralizing fluids are assumed to be derived from blind evolved late acidic magmas rather than from outcropping Aouam granitic stocks.
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