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- W2384457926 abstract "Sullivan Pb-Zn-Ag deposit (British Columbia, Canada) is a classic SEDE X-type massive sulfide deposit, which occurs conformably within clastic metased i mentary rocks of the Middle Proterozoic Aldridge Formation. Several typical mine rals from this deposit are studied, including B-rich (tourmaline), Cl-rich (sc apolite and biotite), Ba-rich (feldspar and mica), and Mn-rich (garnet, chlori te, carbonate and ilmenite) minerals. Tourmaline shows a wide variation of chemi cal compositions, from Mg-rich dravite to Fe-rich schorl and Ca-rich uvite. T he δ- 11B values of the tourmalines are from-11.1 to-2.9‰, which is si milar to the range (-15.4 to-1.7‰) found worldwide in tourmalines from mass ive sulfide deposits and tourmalinites in dominantly clastic metasedimentary ter ranes. Multiple stages of tourmaline formation are distinguished in the Sullivan deposit. Cl-rich scapolites occur in the bedded sulfide ores at Sullivan. The scapolite porphyro blasts are more Ca-rich (EqAn= 40.8～50.9) and Cl-poor (X Cl= 0.38～0.54) than t he fine-grained euhedral scapolite crystals (EqAn= 22.4～35.1 and X Cl= 0. 72～0.8 1) in the same sample. Cl-rich biotites are found only in the bedded sulfide or e s with 0.76 to 1.46 wt% Cl and a limited variation of Mg/(Mg+Fe) ratios (0.34～ 0.37). Other biotites are commonly Cl-poor (0.2 wt%Cl) and have a wider range of Mg/(Mg+Fe) ratios (0.24～0.69). Ba-rich feldspar and muscovite with BaO up to 6.8 wt% also occur within the bedded sulfide ores in association with to urmaline, carbonates, and sulfides. Mn-rich garnets (up to 79% end-member spe ss artine) at Sullivan constitute coticules (spessartine-quartz rocks) and spessar t ine-rich tourmalinites; they also disseminated in sulfide ores and other countr y rocks. Other Mn-rich minerals include chlorite (up to 4.7 wt% MnO), carbonate s (up to 30 wt% MnO), and ilmenite (up to 16.7 wt% MnO). It is suggested that th e existences of aforementioned B-, Cl-, Ba-, and Mn-rich minerals at Sulliva n ar e indicative of possible non-marine evaporite involvement in the ore-forming s ys tem and the bedded sulfide ores were likely precipitated in a dense brine pool i n the Proterozoic sea floor at Sullivan." @default.
- W2384457926 created "2016-06-24" @default.
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- W2384457926 date "2000-01-01" @default.
- W2384457926 modified "2023-09-23" @default.
- W2384457926 title "Ore-Forming Environmental Indicator Minerals from the Sullivan Giant Pb-Zn-Ag Ore Deposit, Canada" @default.
- W2384457926 hasPublicationYear "2000" @default.
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