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Barker, A K; Coogan, Laurence A; Gillis, Kathryn M (2010): (Appendix A) Sulphur isotope ratios of upper crust samples of the sheeted dyke complex at Pito Deep [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.782583, Supplement to: Barker, AK et al. (2010): Insights into the behaviour of sulphur in mid-ocean ridge axial hydrothermal systems from the composition of the sheeted dyke complex at Pito Deep. Chemical Geology, 275(1-2), 105-115, https://doi.org/10.1016/j.chemgeo.2010.05.003

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Abstract:
The behaviour of seawater sulphate in hydrothermal systems at intermediate- to fast-spreading ridges is investigated using new analyses of the d34S, sulphur concentration and Fe2O3/Fe2O3total, combined with existing 87Sr/86Sr, of sheeted dykes from the Pito Deep tectonic window. The Pito Deep sheeted dyke complex has a similar composition to the sheeted dykes drilled at ODP Hole 504B suggesting that the measured compositions are representative of sheeted dyke complexes at intermediate- to fast-spreading ridges. The dykes show only small increases in ?34S which, combined with the rock dominated d34S of vent fluids, requires the majority of seawater sulphate to be precipitated as anhydrite before the fluid reacts with the sheeted dyke complex. This loss of sulphate from the fluid means that a much higher Fe2O3 in the sheeted dyke complex than in fresh MORB glasses cannot be explained by oxidation due to seawater sulphate reduction during fluid–rock reaction. Instead, oxidation probably occurs due to degassing of reduced species, largely H2, during dyke emplacement and solidification. A mass balance model that accounts for anhydrite precipitation and Sr partitioning into the anhydrite, as well as fitting the concentration and isotopic ratios of S and Sr in the sheeted dykes and vent fluids, suggests water/rock ratios of ?1. For a 1 km thick sheeted dyke complex this is equivalent to a fluid flux of ?3 * 10**6 kg/m**2, sufficient to remove ? 60% of the latent heat of crystallization from the lower crust
Coverage:
Median Latitude: -22.933457 * Median Longitude: -111.956457 * South-bound Latitude: -22.983000 * West-bound Longitude: -112.061000 * North-bound Latitude: -22.878000 * East-bound Longitude: -111.875000
Minimum DEPTH, sediment/rock: m * Maximum DEPTH, sediment/rock: m
Event(s):
Al-4076 * Latitude Start: -22.883000 * Longitude Start: -112.061000 * Latitude End: -22.883000 * Longitude End: -112.061000 * Elevation Start: -3625.0 m * Elevation End: -3575.0 m * Location: Western Pacific * Campaign: AT11-23 * Basis: Atlantis (1997) * Method/Device: Submersible Alvin (ALVIN)
Al-4081 * Latitude Start: -22.973000 * Longitude Start: -111.879000 * Latitude End: -22.973000 * Longitude End: -111.878000 * Elevation Start: 3117.0 m * Elevation End: -2985.0 m * Location: Western Pacific * Campaign: AT11-23 * Basis: Atlantis (1997) * Method/Device: Submersible Alvin (ALVIN)
Al-4082 * Latitude Start: -22.972000 * Longitude Start: -111.882000 * Latitude End: -22.973000 * Longitude End: -111.878000 * Elevation Start: -3121.0 m * Elevation End: -2942.0 m * Location: Western Pacific * Campaign: AT11-23 * Basis: Atlantis (1997) * Method/Device: Submersible Alvin (ALVIN)
Comment:
For major element data (except Fe2O3) see Pollock et al (2009) datasets doi:10.1594/PANGAEA.782597 and Heft et al (2008) datasets: doi:10.1594/PANGAEA.782661. For Sr isotope and trace element data see Barker et al (2008) dataset: doi:10.1594/PANGAEA.782664.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2Sample code/labelSample labelBarker, A K
3Lithology/composition/faciesLithologyBarker, A K
4Depth, bathymetricBathy depthmBarker, A K
5LATITUDELatitudeGeocode
6LONGITUDELongitudeGeocode
7--Barker, A KX
8--Barker, A KY
9DEPTH, sediment/rockDepth sedmGeocode
10Depth, relativeDepth rel%Barker, A Kto lava-dyke transition
11AlterationAlterationBarker, A Kclinopyroxene
12AlterationAlterationBarker, A K% clinopyroxene
13AlterationAlterationBarker, A Kgroundmass
14AlterationAlterationBarker, A Ktotal %
15Grain size descriptionGrain size descrBarker, A K
16Mineral assemblageMin assemblBarker, A Kvein mineralogy
17Mineral assemblageMin assemblBarker, A Kgroundmass patch mineralogy
18Iron oxide, Fe2O3Fe2O3%Barker, A K
19Iron oxide, Fe2O3Fe2O3%Barker, A Kduplicate
20Iron oxide, Fe2O3Fe2O3%Barker, A Ktotal Fe
21Iron oxide, Fe2O3/Iron oxide, FeO ratioFe2O3/FeOBarker, A KFe2O3/total Fe
22δ34S, sulfideδ34S H2S‰ CDTBarker, A K
23δ34S, sulfideδ34S H2S‰ CDTBarker, A K
24δ34S, sulfateδ34S [SO4]2-‰ CDTBarker, A K
Size:
741 data points

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