Chemistry of hot springs along the Eastern Lau Spreading Center
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2010-12-08Author
Mottl, Michael J.
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Seewald, Jeffrey S.
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Wheat, C. Geoffrey
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Tivey, Margaret K.
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Michael, Peter J.
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Proskurowski, Giora
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McCollom, Thomas M.
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Reeves, Eoghan P.
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Sharkey, Jessica
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You, Chen-Feng
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Chan, Lui-Heung
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Pichler, Thomas
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https://hdl.handle.net/1912/4437As published
https://doi.org/10.1016/j.gca.2010.12.008Abstract
The Eastern Lau Spreading Center (ELSC) is the southernmost part of the back-arc spreading axis in the Lau Basin, west of the Tonga trench and the active Tofua volcanic arc. Over its 397-km length it exhibits large and systematic changes in spreading rate, magmatic/tectonic processes, and proximity to the volcanic arc. In 2005 we collected 81 samples of vent water from six hydrothermal fields along the ELSC. The chemistry of these waters varies both within and between vent fields, in response to changes in substrate composition, temperature and pressure, pH, water/rock ratio, and input from magmatic gases and subducted sediment. Hot-spring temperatures range from 229º to 363ºC at the five northernmost fields, with a general decrease to the south that is reversed at the Mariner field. The southernmost field, Vai Lili, emitted water at up to 334°C in 1989 but had a maximum venting temperature of only 121ºC in 2005, due to waning activity and admixture of bottom seawater into the subseafloor plumbing system. Chloride varies both within fields and from one field to another, from a low of 528 mmol/kg to a high of 656 mmol/kg, and may be enriched by phase separation and/or leaching of Cl from the rock. Concentrations of the soluble elements K, Rb, Cs, and B likewise increase southward as the volcanic substrate becomes more silica-rich, especially on the Valu Fa Ridge. Iodine and δ7Li increase southward, and δ11B decreases as B increases, apparently in response to increased input from subducted sediment as the arc is approached. Species that decrease southward as temperature falls are Si, H2S, Li, Na/Cl, Fe, Mn, and 87Sr/86Sr, whereas pH, alkalinity, Ca, and Sr increase. Oxygen isotopes indicate a higher water/rock ratio in the three systems on Valu Fa Ridge, consistent with higher porosity in more felsic volcanic rocks. Vent waters at the Mariner vent field on the Valu Fa Ridge are significantly hotter, more acid and metal-rich, less saline, and richer in dissolved gases and other volatiles, including H2S, CO2, and F, than the other vent fields, consistent with input of magmatic gases. The large variations in geologic and geophysical parameters produced by back-arc spreading along the ELSC, which exceed those along mid-ocean ridge spreading axes, produce similar large variations in the composition of vent waters, and thus provide new insights into the processes that control the chemistry of submarine hot springs.
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Author Posting. © The Author(s), 2010. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Geochimica et Cosmochimica Acta 75 (2011): 1013-1038, doi:10.1016/j.gca.2010.12.008.
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Preprint: Mottl, Michael J., Seewald, Jeffrey S., Wheat, C. Geoffrey, Tivey, Margaret K., Michael, Peter J., Proskurowski, Giora, McCollom, Thomas M., Reeves, Eoghan P., Sharkey, Jessica, You, Chen-Feng, Chan, Lui-Heung, Pichler, Thomas, "Chemistry of hot springs along the Eastern Lau Spreading Center", 2010-12-08, https://doi.org/10.1016/j.gca.2010.12.008, https://hdl.handle.net/1912/4437Related items
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