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• W2037740564 abstract "New Sm-Nd, Rb-Sr, and Pb-Pb isotope data of scheelites and their host rocks from the Felbertal scheelite deposit (Central Tauern Window, Eastern Alps, Austria) are presented. The oldest stage 1 scheelites are rarely preserved. They plot together with recrystallized stage 2 scheelite porphyroblasts on a Sm-Nd isochron of 581 ± 105 Ma. This Sm-Nd age is regarded as the time of the primary tungsten mineralization. Our interpretation is enhanced by a (within error limits) similar age of 517 ± 114 Ma derived from a 207Pb/206Pb scheelite isochron and a date of 517 ± 130 Ma obtained from two co-genetic relics (a clinopyroxene and a tschermakitic amphibole) within a metapyroxenite. The stage 2 scheelite blastesis was possibly triggered by an still unassured Ordovician “Caledonian” metamorphism and further promoted by a Carboniferous granitoid intrusion and a Variscan metamorphism without an isotopic reset. Both yellowish-fluorescent, Mo-bearing stage 1 and stage 2 scheelites were formed under oxidizing, alkaline conditions, which obviously did not promote REE fractionation and did not disturb the original Sm-Nd isotopic system. This evidently was not the case during younger remobilizations in Late Variscan and Alpine metamorphic times when stage 3 (319 ± 34 Ma) and stage 4 (29 ± 17 Ma) scheelites formed. Both stages consist of bluish-fluorescent, Mopoor to Mo-free scheelites that reveal significant REE depletion and fractionation, probably due to repeated corrosion and re-precipitation under more reducing neutral to slightly acidic conditions. The source and mechanism of deposition of the primary tungsten mineralization are deduced from five facts: (1) the radiogenic strontium isotopic data of stage 1 scheelites (87Sr86Sr = 0.726–0.730) occurring together with normal crustal neodymium isotopic compositions (εCHURt + 1 = −3.8 to -7.3), (2) unusually high U concentrations up to 74 ppm in stage 1 scheelites, (3) a sudden 87Sr increase between the formation of magmatic clinopyroxene (87Sr/86Srt = 0.707; considered to have precipitated within a magma chamber) and of ubiquitous tschermakitic hornblende (87Sr86Srt = 0.736; interpreted as subsolidus mineralization during infiltration of a hydrous fluid), (4) an extraordinary enrichment of cesium, a lesser, but still significant, enrichment of rubidium (and lithium), and normal arc-like contents of potassium in the mafites, (5) the lead isotopic compositions of the scheelites and their host rocks. The latter indicate a mantle signature overprinted by a crustal component at an active continental margin. We suggest that a midlevel crustal position in an active continental margin setting is the most probable site for the primary tungsten source. Tungsten-bearing, ascending fluids from dehydrated granulites (with mica-breakdown reactions) established a convective fluid system supported by gabbroic and co-eval granitoid intrusions. We assume that a rock mass of some 103 km3 may have undergone granulite-facies reactions (with fluid formation) to provide the total tungsten content of 200,000 tons in the Felbertal deposit. This would imply that the tungsten content in the released fluid has been some 100 ppm." @default.
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• W2037740564 date "1997-12-01" @default.
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• W2037740564 title "Dating scheelite stages: A strontium, neodymium, lead approach from the Felhertal tungsten deposit, Central Alps, Austria" @default.
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• W2037740564 doi "https://doi.org/10.1016/s0016-7037(97)00349-9" @default.
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