Other
Scientific paper
Aug 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995e%26psl.134...53e&link_type=abstract
Earth and Planetary Science Letters, vol. 134, Issue 1-2, pp.53-67
Other
9
Scientific paper
The hydrothermal fluid chemistry data set for sediment starved ridge axes is used to estimate endmember compositions and to constrain a three-component mixing model based on that of Von Damm, using numerical methods to estimate the endmember compositions. The data set includes Fe, Cl, H 2 S, Na, K, Ca, and Sr, at 11-13°N and 21°N East Pacific Rise, North and South Cleft Segment (Southern Juan de Fuca Ridge), TAG, and MARK. Q-mode factor analysis shows that the data can be explained (99.9%) by 3 factors. A constrained optimization of a weighted least-squares algorithm, assuming conservative mixing and with the constraints that all endmember concentrations and contributions are non-negative and that fractional contributions sum to one, is used to partition the data set into endmembers. Mixing of the calculated endmembers-consistently found to be phase-separated brine, vapor, and hydrothermally altered seawater -reproduces the composition of the vent fluids. The model is consistent with the presence of a convecting brine layer in the primary reaction zone at depth, as suggested by Bischoff and Rosenbauer, that transfers properties to the overlying circulating seawater by release of a "vapor" and by diffusion. We suggest that future experimental work examine solubility controls in conjunction with and subsequent to phase separation, and work with a wider range of fluid salinities.
Edmond John M.
Edmonds Henrietta N.
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