EXCESS DISSOLVED CA IN THE DEEP OCEAN: A HYDROTHERMAL HYPOTHESIS
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dc.contributor.author | de Villiers S. | |
dc.date.accessioned | 2020-12-29T10:10:05Z | |
dc.date.available | 2020-12-29T10:10:05Z | |
dc.date.issued | 1998 | |
dc.identifier | https://elibrary.ru/item.asp?id=93370 | |
dc.identifier.citation | Earth and Planetary Science Letters, 1998, , 3, 627-641 | |
dc.identifier.issn | 0012-821X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/21670 | |
dc.description.abstract | Variations in seawater alkalinity and dissolved calcium provide information essential to establishing the integrated deep ocean calcium carbonate dissolution flux. High-precision Ca measurements reported here confirm earlier suggestions that the deep ocean contains higher levels of dissolved Ca than expected from calcium carbonate dissolution only. I propose that the mid-depth Ca excess is a manifestation of the circulation of seawater through hydrothermal systems at mid-ocean ridges. Qualitative agreement with δ3He distributions, and evidence for deep water Mg depletions, support this hypothesis. The magnitude of the mid-depth Ca excess implies a total hydrothermal flux larger than expected from the corresponding excess in 3He, and points to the relative importance of low-temperature diffuse fluxes versus high-temperature discrete fluxes for elements such as Ca. The implied total hydrothermal flux for Ca is consistent with its oceanic mass balance requirements, and resolves several long-standing problems associated with our understanding of the chemical evolution of the ocean, and in particular its low alkaline content. | |
dc.subject | CALCIUM | |
dc.subject | ALKALINITY | |
dc.subject | SEAWATER | |
dc.subject | HYDROTHERMAL PROCESSES | |
dc.subject | MAGNESIUM | |
dc.title | EXCESS DISSOLVED CA IN THE DEEP OCEAN: A HYDROTHERMAL HYPOTHESIS | |
dc.type | Статья |
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