A new Fe/Mn geothermometer for hydrothermal systems: Implications for high-salinity fluids at 13°N on the East Pacific Rise

Pester, Nicholas J.; Rough, Mikaella; Ding, Kan; Seyfried, William E.

doi:10.1016/j.gca.2011.08.043

Cited by 58 publications

(56 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Both regions are designed to simulate the range of physical conditions that are experienced by hydrothermal fluids at mid-ocean ridges (MORs) (Berndt and Seyfried, 1997;Oosting and Von Damm, 1996;Pester et al, 2014Pester et al, , 2011Von Damm, 2000). Region 1 (Fig.…”

Section: Methodsmentioning

confidence: 99%

Fe isotope fractionation during phase separation in the NaCl–H2O system: An experimental study with implications for seafloor hydrothermal vents

Syverson

Pester

Craddock

et al. 2014

Earth and Planetary Science Letters

Self Cite

View full text Add to dashboard Cite

Section: Methodsmentioning

confidence: 99%

Fe isotope fractionation during phase separation in the NaCl–H2O system: An experimental study with implications for seafloor hydrothermal vents

Syverson

Pester

Craddock

et al. 2014

Earth and Planetary Science Letters

Self Cite

View full text Add to dashboard Cite

“…Additional anions (SO 4 , Br), major cations (Na, K, Ca, Mg), and minor/trace components (Li, Rb, Cs, Sr, Si, B, Fe) were analyzed by a combination of ion chromatography (IC), inductively coupled plasma optical emission spectrometry (ICP-OES), and inductively coupled plasma mass spectrometry (ICP-MS). The analytical uncertainty that attends these measurements is on the order of 2-10% (2r) of the reported concentrations, with lower concentration components carrying the greater uncertainty Pester et al, 2011). These analyses were also calibrated against IAPSO seawater for appropriate elements; and overlapping measurements of major cations by both IC and ICP-OES showed excellent agreement.…”

Section: Sample Collection and Analysis Of Hydrothermal Fluidsmentioning

confidence: 98%

The Lost City hydrothermal system: Constraints imposed by vent fluid chemistry and reaction path models on subseafloor heat and mass transfer processes

Seyfried

Pester

Tutolo

et al. 2015

Geochimica et Cosmochimica Acta

Self Cite

123

View full text Add to dashboard Cite

Since the first reported discovery of the Lost City hydrothermal system in 2001, it was recognized that seawater alteration of ultramafic rocks plays a key role in the composition of the coexisting vent fluids. The unusually high pH and high concentrations of H 2 and CH 4 provide compelling evidence for this. Here we report the chemistry of hydrothermal fluids sampled from two vent structures (Beehive: $90-116°C, and M6: $75°C) at Lost City in 2008 during cruise KNOX18RR using ROV Jason 2 and R/V Revelle assets. The vent fluid chemistry at both sites reveals considerable overlap in concentrations of dissolved gases (H 2 , CH 4 ), trace elements (Cs, Rb, Li, B and Sr), and major elements (SO 4 , Ca, K, Na, Cl), including a surprising decrease in dissolved Cl, suggesting a common source fluid is feeding both sites. The absence of Mg and relatively high concentrations of Ca and sulfate suggest solubility control by serpentine-diopside-anhydrite, while trace alkali concentrations, especially Rb and Cs, are high, assuming a depleted mantle protolith. In both cases, but especially for Beehive vent fluid, the silica concentrations are well in excess of those expected for peridotite alteration and the coexistence of serpentine-brucite at all reasonable temperatures. However, both the measured pH and silica values are in better agreement with serpentine-diop side-tremolite-equilibria. Geochemical modeling demonstrates that reaction of plagioclase with serpentinized peridotite can shift the chemical system away from brucite and into the tremolite stability field. This is consistent with the complex intermingling of peridotite and gabbroic bodies commonly observed within the Atlantis Massif. We speculate the existence of such plagioclase bearing peridotite may also account for the highly enriched trace alkali (Cs, Rb) concentrations in the Lost City vent fluids. Additionally, reactive transport modeling taking explicit account of temperature dependent rates of mineral dissolution and precipitation clarifies the feedback between permeability, heat loss, and changes in the dissolved Si of the vent fluids. Assuming both the Beehive and M6 vent fluids were sourced at similar subseafloor conditions (tremolite buffered at 200°C), model results indicate loss of approximately 30% Si upon cooling to $150°C during upflow. However, Si concentrations remained largely conservative with continued cooling to lower temperatures owing to unfavorable reaction kinetics. While consistent with the Beehive endmember composition, these results fail to explain the relative Si depletion in the lower temperature M6 fluids. Thus, it may be that more robust kinetic models for silicates are needed to accurately account for the mechanism and rate of silica removal in the unusually high pH of the Lost City vent fluids.

show abstract

“…Additional subsamples were preserved for shore based analysis of major dissolved anions/cations, and trace metals by ion chromatography (IC) and/or inductively coupled plasma optical emission spectrometry (ICP-OES) at the University of Minnesota (see Pester et al (2011) for analytical details and associated uncertainties). A trace metal aliquot was immediately acidified with analytical grade HCl (Optima).…”

Section: Sample Collection and Analysismentioning

confidence: 99%

“…Some of the fluid samples from 1993 to 1997 exhibit disequilibria, trending towards or falling outside the field predicted for coexistence with basalt alteration minerals. This apparent (short-term) disequilibria results from the more sluggish response of Mn relative to Fe with conductive cooling (Seewald and Pester et al, 2011) and these effects are more likely to be observed at Lucky Strike in conjunction with the comparatively low exit temperatures. Still, Fe/Mn appear to have equilibrated for many of the samples, including all those acquired in 2008.…”

Section: Temperature and Pressure Controls On Subseafloor Phase Equilmentioning

confidence: 99%

Subseafloor phase equilibria in high-temperature hydrothermal fluids of the Lucky Strike Seamount (Mid-Atlantic Ridge, 37°17′N)

Pester

Reeves

Rough

et al. 2012

Geochimica et Cosmochimica Acta

Self Cite

View full text Add to dashboard Cite

A new Fe/Mn geothermometer for hydrothermal systems: Implications for high-salinity fluids at 13°N on the East Pacific Rise

Cited by 58 publications

References 49 publications

Fe isotope fractionation during phase separation in the NaCl–H2O system: An experimental study with implications for seafloor hydrothermal vents

Fe isotope fractionation during phase separation in the NaCl–H2O system: An experimental study with implications for seafloor hydrothermal vents

The Lost City hydrothermal system: Constraints imposed by vent fluid chemistry and reaction path models on subseafloor heat and mass transfer processes

Subseafloor phase equilibria in high-temperature hydrothermal fluids of the Lucky Strike Seamount (Mid-Atlantic Ridge, 37°17′N)

Contact Info

Product

Resources

About