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- W1614104344 abstract "Alkaline hydrothermal fluids favor phosphate chemistry and the dissolution of organic acids and bases, and were proposed as a possible scenario for the emergence of life in the Archaean (Russell & Hall, 2002). In high S2 environments, Fe-sulfide membranes would have thus played a major role. Most of the studies on microfossils in Archaean chert plead however for acidic fluids. Furthermore the record of sulfurized microfossils in S-rich cherts is poorly known (Rasmussen, 2000). To improve the experiential knowledge in this field, we studied Upper Devonian black shales from a continental margin (Selwyn Basin, Canada) for micromineralogy and mineral chemistry (SEM-EDX-EMPPIXE-NR). The sediments have been pervaded by alkaline fluids (< 260°) that precipitated successively Na-, Kand BaK-feldspar, quartz, Caand REE-phosphates, U-Ti-oxides and Ag-Cd (Cl) alloys. Tube worms (about 30μm) as known from hydrothermal vents, are preserved as Fe-(Ni)-sulfides. Biogenic silica bands are separated by nanometric Znsulfides, probably derived form microbial reduction. Sulfurized worm tubes host several hundreds to thousands ppm of Se, Mo, As, Sb, Tl. Diagenetic abiogenic sulfides are Ni and Se rich. Nitrogen was analysed in biogenic and abiogenic sulfides (about 400 ppm), phosphatic fossil fragments (800 ppm), organic matter (OM, 6000 ppm), quartz (800 ppm). Highest contents occur in hydrothermal feldspars (1-2 wt.%). A two-step N release is proposed for the present N-repartition: (1) OM breakdown provides nutrients for the tube worms. (2) Biomineralisation of the fauna partly releases N to the diagenetic fluids and is incorporated in abiogenic sulfides and quartz. Ammonium (NH4 ) derived from the breakdown of organic matter is fixed in feldspars (at high T), where it replaces K in the silica structure." @default.
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- W1614104344 date "2003-09-01" @default.
- W1614104344 modified "2023-09-26" @default.
- W1614104344 title "Alkaline hydrothermalism in S-, rare metal and P-rich black shales" @default.
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