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• W2109326614 abstract "The Bjorkdal quartz vein-hosted gold deposit is located ~25 km northwest of Skellefte in northern Sweden, within a Paleoproterozoic volcanosedimentary sequence at the margin of a quartz-monzodiorite granitoid. Northeast-trending (030°– 050°) quartz veins from the eastern open pit within the Bjorkdal deposit contain quartz, scheelite, tourmaline, calcite, and sulfides, with visible gold. Vein quartz shows undulatory extinction and sutured margins or is polycrystalline in form, features which suggest postcrystallization deformation. Coarse scheelite crystals (>5 mm) within the quartz veins are crosscut by thin veins of quartz, calcite, sulfides, and gold. The calcite in these crosscutting fractures is variably replaced by biotite or actinolite. Tourmaline from the quartz veins has low total REE contents (<1 × chondrite) and LREE-enriched patterns [(La/Sm)N = 2.8–4.5, (La/Yb)N = 1.8–5.1] with strong positive Eu anomalies (Eu/Eu* = 3.9–17.4). In contrast, the scheelite has a bell-shaped REE pattern, enriched in MREE, but also with positive Eu anomalies (Eu/Eu* = 1.4–2.4). The REE pattern of scheelite results from a strong crystallographic effect, largely due to the size of the Ca site and charge balance. Sm-Nd dating of scheelite from the Bjorkdal ore yields an age of 1893 ± 34 Ma, which coincides with a previously suggested age of the host intrusion. The eNd values of the scheelite (+1.8) and 87Sr/86Sr initial ratios of the tourmaline (0.7013–0.7014) are also consistent with derivation of REE and Sr in these minerals from the Jorn granitoids. Overall, the petrographic, geochemical, and isotopic data strongly suggest that Bjorkdal is an intrusion-related gold deposit, and that there is no requirement for involvement of external post-magmatic hydrothermal fluids." @default.
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• W2109326614 date "2006-11-01" @default.
• W2109326614 modified "2023-09-26" @default.
• W2109326614 title "Sm-Nd and REE Characteristics of Tourmaline and Scheelite from the Bjorkdal Gold Deposit, Northern Sweden: Evidence of an Intrusion-Related Gold Deposit?" @default.
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• W2109326614 doi "https://doi.org/10.2113/gsecongeo.101.7.1415" @default.
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