Hydrothermal systems hosted in peridotites at slow-spreading ridges. Modeling phase transformations and material balance: Upwelling limb of the hydrothermal cell |
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| Authors: | S A Silantyev M V Mironenko A A Novoselov |
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| Institution: | (1) Department of Earth Sciences—Geochemistry, Faculty of Geosciences, Utrecht University, P.O. Box 80.021, TA 3508 Utrecht, Netherlands |
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| Abstract: | The research was centered on the estimation of geochemical and mineralogical effects related to the transport of hydrothermal
fluid to the seafloor surface in the upwelling limb of a hydrothermal system hosted in peridotites at slow-spreading mid-oceanic
ridges. The three variants of the location of the root zone of the circulation cell considered in this research were as follows:
(1) shallow-depth, with T = 107°C, P = 1.14 kbar; (2) moderate low depths, with T = 151°C, P = 1.4 kbar; and (3) deep, with T = 500°C, P = 4 kbar. The modeling results demonstrate that ore material is accumulated in the discharge zones of serpentinite-related
hydrothermal systems only at a high temperature of the fluid in the discharge zone of the upwelling limb of the circulation
cell. The root zones at hydrothermal fields that meet this condition should be situated at a significant depth in the crustal
section. It was also established that a significant volume of ore material involved in hydrothermal material exchange between
the peridotites and fluid is redeposited in the downwelling limb of the hydrothermal system and gives rise to disseminated
ore mineralization, which is typical of many serpentinized abyssal peridotites. The activity of moderately low-temperature
and low-temperature hydrothermal systems in peridotites does not concentrate ore material in the discharge zone, and no hydrothermal
edifices can grow at such systems. |
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