CO-PRECIPITATION OF SR2+ AND BA2+ WITH ARAGONITE BY MEMBRANE DIFFUSION OF CO2 BETWEEN 10 AND 50 °C
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dc.contributor.author | Dietzel M. | |
dc.contributor.author | Gussone N. | |
dc.contributor.author | Eisenhauer A. | |
dc.date.accessioned | 2022-03-12T04:13:49Z | |
dc.date.available | 2022-03-12T04:13:49Z | |
dc.date.issued | 2004 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=5191233 | |
dc.identifier.citation | Chemical Geology, 2004, 203, 1-2, 139-151 | |
dc.identifier.issn | 0009-2541 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/36211 | |
dc.description.abstract | Aragonite is precipitated by a new CO2-diffusion technique from a Ca2+-Mg2+-Cl- solution between 10 and 50 °C. Crystallisation of aragonite instead of calcite occurs by maintaining a [Mg2+]/[Ca2+] ratio of 2 in the fluid. The dissolved inorganic carbon (DIC) is received by diffusion of CO2 through a polyethylene membrane (diffusion coefficient: DCO2=10-6.4 cm2 s-1 at 19 °C). It is suggested that significant amounts of DIC may be transferred by diffusion of CO2 in natural systems if the CO2 gradient is high. The CO2-diffusion technique is used as a kind of simple mixed flow reactor for the co-precipitation of barium and strontium with aragonite. The distribution coefficients of Ba2+ and Sr2+ decrease from 10 to 50 °C according to DBa,a*=2.42-0.03595T (°C) and DSr,a*=1.32-0.005091T (°C). At 25 °C, the distribution coefficients are DBa,a*=1.5+/-0.1 and DSr,a*=1.19+/-0.03. The effect of temperature on DBa,a* is about one order of magnitude higher versus that on DSr,a*. Thus, Ba2+ may be a potential paleotemperature indicator if the composition of the solution is known. | |
dc.subject | ARAGONITE | |
dc.subject | CO2 DIFFUSION | |
dc.subject | COPRECIPITATION | |
dc.subject | BARIUM | |
dc.subject | STRONTIUM | |
dc.title | CO-PRECIPITATION OF SR2+ AND BA2+ WITH ARAGONITE BY MEMBRANE DIFFUSION OF CO2 BETWEEN 10 AND 50 °C | |
dc.type | Статья |
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