The chemistry of hydrothermal fluids from the Broken Spur site, 29°N Mid-Atlantic ridge
James, R.H., Elderfield, H. and Palmer, M.R. (1995) The chemistry of hydrothermal fluids from the Broken Spur site, 29°N Mid-Atlantic ridge. Geochimica et Cosmochimica Acta, 59, (4), 651-659. (doi:10.1016/0016-7037(95)00003-I).
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Description/Abstract
Hydrothermal fluids have been collected from three high temperature (360–364°C) vents from Broken Spur (29°10.08′N, 43°10.46′W; water depth ∼ 3100 m). This is only the fourth site on a slow spreading ridge from which such fluids have been collected. Compared to other vent sites, the hydrothermal fluids are enriched in Li (1035 μM) and have lower dissolved Mn (∼250 μM) and Sr (43 μM) concentrations. The boron isotope systematics indicate that substantial removal (>50%) of seawater B has occurred in the low-temperature portion of the hydrothermal convection cell. In addition, low temperature removal of seawater Sr is ∼10% greater at Broken Spur compared to similar vent sites in the Pacific where spreading rates are faster. A low Eu anomaly (11 ± 3) and a View the MathML source ratio (10.8) intermediate between pristine and weathered basalt suggest that the vent fluids have interacted with a component of basalt that has previously undergone low-temperature weathering. the fluids are 14% depleted in Cl relative to seawater. Supercritical phase separation appears to be the only reasonable process that may account for the fluid depletion.
| Item Type: | Article |
|---|---|
| ISSNs: | 0016-7037 (print) 0016-7037 (electronic) |
| Subjects: | G Geography. Anthropology. Recreation > GC Oceanography Q Science > QD Chemistry |
| Divisions: | Faculty of Natural and Environmental Sciences > Ocean and Earth Science > Geochemistry National Oceanography Centre (NERC) > Marine Geoscience |
| Item ID: | 210299 |
| Date Deposited: | 07 Feb 2012 13:55 |
| Last Modified: | 26 Apr 2013 01:27 |
| Contributors: | James, R.H. (Author) Elderfield, H. (Author) Palmer, M.R. (Author) |
| Date: | 1995 |
| Status: | Published |
| URI: | http://eprints.soton.ac.uk/id/eprint/210299 |
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