FORMATION OF COAGULATED COLLOIDAL SILICA IN HIGH-TEMPERATURE MINERALIZING FLUIDS
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dc.contributor.author | Williamson B.J. | |
dc.contributor.author | Wilkinson J.J. | |
dc.contributor.author | Luckham P.F. | |
dc.contributor.author | Stanley C.J. | |
dc.date.accessioned | 2021-06-18T05:48:28Z | |
dc.date.available | 2021-06-18T05:48:28Z | |
dc.date.issued | 2002 | |
dc.identifier | https://elibrary.ru/item.asp?id=14128838 | |
dc.identifier.citation | Mineralogical Magazine, 2002, 66, 4, 547-553 | |
dc.identifier.issn | 0026-461X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/29099 | |
dc.description.abstract | Recent experimental studies have suggested that colloidal silica can form in high-T (300 to >700°C) hydrothermal fluids (Wilkinson et al., 1996). Natural evidence in support of this was found by Williamson et al. (1997) who proposed a colloidal (gel) silica origin for <50 mmirregularly-shaped inclusions of quartz contained in greisen topaz fromsouthwest England. Confocal and microprobe studies, presented here, strengthen this argument although rather than forming a gel in the hydrothermal fluid, it is suggested that the colloidal silica aggregated as a viscous coagulated colloid, with much of its volume (<10 to 30 vol.%) consisting of metal (mainly Fe) -rich particles. This is evident from the largely solid nature of metal-rich shrinkage bubbles contained at the margins of the inclusions of quartz which shows that the material forming the inclusions contained much less liquid than would be expected in a silica gel. These findings may have important implications for models of ore formation since the precipitation of a coagulated colloid could inhibit hydrothermal fluid transport and cause co-deposition of silica and entrained ore-forming elements. The mode of formation of the colloidal silica and further implications of the study are discussed. | |
dc.subject | silica | |
dc.subject | colloid | |
dc.subject | hydrothermal | |
dc.subject | ore genesis | |
dc.subject | supercritical fluids | |
dc.title | FORMATION OF COAGULATED COLLOIDAL SILICA IN HIGH-TEMPERATURE MINERALIZING FLUIDS | |
dc.type | Статья |
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