Citation:

j.chemgeo.2010.05.003

Name: (Appendix A) Sulphur isotope ratios of upper crust samples of the sheeted dyke complex at Pito Deep
Published: 2010
License: https://creativecommons.org/licenses/by/3.0/

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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: 0 m * Maximum DEPTH, sediment/rock: 0 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: * Basis: * 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: * Basis: * 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: * Basis: * 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):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	Event label	Event
2	Sample code/label	Sample label		Barker, A K
3	Lithology/composition/facies	Lithology		Barker, A K
4	Depth, bathymetric	Bathy depth	m	Barker, A K
5	LATITUDE	Latitude			Geocode
6	LONGITUDE	Longitude			Geocode
7	-	-		Barker, A K	X
8	-	-		Barker, A K	Y
9	DEPTH, sediment/rock	Depth sed	m		Geocode
10	Depth, relative	Depth rel	%	Barker, A K	to lava-dyke transition
11	Alteration	Alteration		Barker, A K	clinopyroxene
12	Alteration	Alteration		Barker, A K	% clinopyroxene
13	Alteration	Alteration		Barker, A K	groundmass
14	Alteration	Alteration		Barker, A K	total %
15	Grain size description	Grain size descr		Barker, A K
16	Mineral assemblage	Min assembl		Barker, A K	vein mineralogy
17	Mineral assemblage	Min assembl		Barker, A K	groundmass patch mineralogy
18	Iron oxide, Fe2O3	Fe2O3	%	Barker, A K
19	Iron oxide, Fe2O3	Fe2O3	%	Barker, A K	duplicate
20	Iron oxide, Fe2O3	Fe2O3	%	Barker, A K	total Fe
21	Iron oxide, Fe2O3/Iron oxide, FeO ratio	Fe2O3/FeO		Barker, A K	Fe2O3/total Fe
22	δ34S, sulfide	δ34S H2S	‰ CDT	Barker, A K
23	δ34S, sulfide	δ34S H2S	‰ CDT	Barker, A K
24	δ34S, sulfate	δ34S [SO4]2-	‰ CDT	Barker, A K

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

741 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Event	2 Sample label	3 Lithology	4 Bathy depth [m]	5 Latitude	6 Longitude	7 - (X)	8 - (Y)	10 Depth rel [%] (to lava-dyke transition)	11 Alteration (clinopyroxene)	12 Alteration (% clinopyroxene)	13 Alteration (groundmass)	14 Alteration (total %)	15 Grain size descr	16 Min assembl (vein mineralogy)	17 Min assembl (groundmass patch mineralogy)	18 Fe2O3 [%]	19 Fe2O3 [%] (duplicate)	20 Fe2O3 [%] (total Fe)	21 Fe2O3/FeO (Fe2O3/total Fe)	22 δ34S H2S [‰ CDT]	23 δ34S H2S [‰ CDT]	24 δ34S [SO4]2- [‰ CDT]
J2-119-1	020705-1121	dike	3969.2	-22.886	-112.059	4193	5238	647	amphibole	pervasive	amphibole	pervasive	fine	amphibole	amphibole
J2-119-1	020705-1219	dike	3830.2	-22.885	-112.058	4276	5353	508	amphibole	high	amphibole/chlorite	high	fine-medium	amphibole	chlorite/amphibole	2.18	2.13	11.28	0.19	-0.6	-0.2
J2-119-1	020705-1408	dike	3657.0	-22.884	-112.056	4425	5516	335	amphibole	slight	amphibole	moderate	fine-medium	amphibole	-	0.76	0.82	11.89	0.07	-2.0	-1.7
J2-119-1	020705-1423	dike	3614.0	-22.883	-112.056	4451	5551	292	amphibole	high	amphibole/chlorite	moderate	medium	-	-					1.4
J2-119-1	020705-1451	dike	3601.0	-22.883	-112.056	4489	5602	279	amphibole	pervasive	chlorite/smect	high	fine	amphibole	-	1.15	1.23	12.03	0.10	1.2
J2-119-1	020705-2131	dike	3523.0	-22.882	-112.055	4543	5707	201	amphibole	slight	amphibole/chlorite	moderate	medium	-	-	3.32	3.23	10.85	0.30
J2-119-1	020705-2200	dike	3477.9	-22.882	-112.055	4569	5685	156	amphibole	slight	amphibole	slight	fine	amphibole/Fe-Cu-sulphide/feldspar/chlorite	-	2.80	2.63	10.17	0.27	-7.2	-7.7
J2-119-1	020705-2225	dike	3425.0	-22.881	-112.055	4615	5804	103	amphibole	m/h	amphibole	moderate	coarse	amphibole	-	1.61	1.54	9.77	0.16	-1.1	-0.4
J2-119-1	020705-2247	dike	3375.0	-22.881	-112.054	4635	5869	53	amphibole	moderate	amphibole/chlorite	moderate	coarse	amphibole	amphibole/chlorite/Fe-Cu-sulphide
J2-119-1	020705-2317	dike	3310.0	-22.880	-112.054	4698	5940	-12	-	-	amphibole	moderate	fine	-	-	1.70	1.75	11.62	0.15
J2-119-1	020705-2343	dike	3275.0	-22.880	-112.053	4732	5967	-47	amphibole	high	amphibole	high	fine-medium	amphibole	-
J2-119-1	020805-0009	dike	3182.0	-22.879	-112.053	4800	6010	-140	amphibole/chlorite	moderate	amphibole/chlorite	moderate	fine	-	-
J2-119-1	020805-0019	lava	3154.0	-22.879	-112.052	4847	6050	-168	-	-	clay	moderate	fine	-	-
J2-119-1	020805-0042	lava	3117.0	-22.879	-112.052	4887	6068	-205	-	-	clay	-	fine	-	-
J2-119-1	020805-0108	lava	3042.0	-22.878	-112.051	4964	6166	-280	clay	slight	clay	moderate	fine	-	-	2.04	2.23	10.88	0.20
J2-119-2	020805-1327	dike	3578.0	-22.883	-112.060	4087	5558	351	amphibole	moderate	amphibole/chlorite	moderate	coarse	-	chlorite/amphibole	3.28	3.32	9.80	0.34	2.5
Al-4076	4076-1629	dike	3625.0	-22.883	-112.061	3975	5578	398	amphibole	moderate	amphibole/chlorite	moderate	coarse	-	-					0.8		3.5
Al-4076	4076-1654	dike	3622.0	-22.883	-112.061	3975	5595	395	amphibole	m/h	amphibole/chlorite	moderate	coarse	-	-	5.95	6.06	15.94	0.38	1.3
Al-4076	4076-1725	dike	3580.0	-22.883	-112.061	3975	5615	353	amphibole	moderate	amphibole/chlorite	high	coarse	-	-	2.92	2.85	11.55	0.25
Al-4076	4076-1740	dike	3575.0	-22.883	-112.061	3980	5628	348						-	-			10.15
J2-123-4	022205-0320	dike	3897.0	-22.983	-111.890	6106	3745	1092	amphibole	moderate	chlorite	high	medium	-	chlorite	1.71	1.89	12.21	0.15	1.3	1.3
J2-123-4	022205-0335	dike	3884.0	-22.983	-111.890	6110	3782	1079	amphibole	moderate	amphibole	moderate	medium	amphibole	-	1.82	1.79	10.88	0.17	1.6	1.5
J2-123-4	022205-0852	dike	3197.0	-22.974	-111.880	7161	4765	392	amphibole	high	chlorite	moderate	coarse	-	-	1.76	1.82	11.37	0.16
J2-123-4	022205-0941	dike	3142.0	-22.974	-111.880	7185	4772	337	amphibole	slight	amphibole/chlorite	moderate	fine	chlorite/quartz	-	3.09	3.20	13.76	0.23
J2-123-4	022205-1105	dike	3015.0	-22.973	-111.879	7273	4863	210	amphibole	moderate	chlorite	moderate	medium	chl/amphibole	-	2.16	2.03	13.14	0.16	2.3
J2-123-4	022205-1200	dike	2930.0	-22.972	-111.878	7361	4943	125	amphibole	moderate	amphibole	moderate	fine	chlorite/quartz	-	3.94	4.12	12.40	0.33
J2-123-4	022205-1220	dike	2878.0	-22.972	-111.878	7382	4956	73	amphibole	pervasive	amphibole	high	fine	chl/amphibole/Fe-Cu-sulphide	-	5.09	5.18	13.35	0.38	2.3
J2-123-4	022205-1335	lava	2675.0	-22.969	-111.876	7551	5311	-130	clay	slight	clay	slight	coarse	-	-
J2-123-4	022205-1404	lava	2630.0	-22.968	-111.875	7626	5409	-175	clay	slight	clay	moderate	fine	-	-			11.10
J2-123-5	022305-0306	dike	2989.0	-22.974	-111.876	7505	4728	93	amphibole	moderate	amphibole	slight	fine	amphibole/Fe-Cu-sulphide/epidote	-			14.14
J2-123-5	022305-0456	dike	2978.0	-22.974	-111.876	7581	4724	82	amphibole	slight	chlorite/smec	moderate	fine	chlorite/amphibole/Fe-Cu-sulphide	amphibole	2.29	2.41	12.31	0.19
Al-4081	4081-2005	dike	3117.0	-22.973	-111.879	7200	4843	437	amphibole	moderate	chlorite/smec	high	coarse	-	-	2.89	2.75	13.51	0.21	2.6
Al-4081	4081-2110	dike	3088.0	-22.974	-111.879	7278	4819	408	amphibole	moderate	chlorite/smec	moderate	medium	-	-
Al-4081	4081-2124	dike	3083.0	-22.974	-111.878	7303	4783	403	amphibole	moderate	amphibole/chlorite	moderate	medium	amphibole/chlorite	-	3.07	3.24	12.41	0.25
Al-4081	4081-2132	dike	3083.0	-22.974	-111.878	7305	4783	403	amphibole	moderate	chlorite	moderate	fine-medium	chlorite/quartz	-	1.02	1.13	11.03	0.10
Al-4081	4081-2234	dike	2985.0	-22.973	-111.878	7370	4855	305	amphibole	moderate	chlorite	moderate	fine-medium	-	-	2.52	2.49	14.22	0.18	1.5	1.9
Al-4082	4082-1620	dike	3121.0	-22.972	-111.882	6949	5035	441	amphibole	moderate	amphibole/chlorite	moderate	coarse	-	-	3.26	3.27	13.73	0.24	0.3	0.4
Al-4082	4082-1722	dike	3087.0	-22.972	-111.882	6975	4980	407	amphibole	moderate	amphibole/chlorite	moderate	coarse	amphibole	-	2.76	2.63	14.49	0.19	1.2
Al-4082	4082-1749	dike	3086.0	-22.973	-111.880	7151	4905	406		-	chlorite/smec	slight	fine	-	-	4.20	4.24	14.07	0.30	3.0	2.6
Al-4082	4082-1814	dike	3091.0	-22.973	-111.880	7105	4860	411	amphibole	moderate	amphibole/chlorite	moderate	medium	-	-	2.63	2.49	12.66	0.20
Al-4082	4082-1838	dike	3092.0	-22.974	-111.880	7150	4812	412	amphibole	high	amphibole/chlorite	moderate	medium	-	-			12.87
Al-4082	4082-1904	dike	3094.0	-22.974	-111.879	7280	4780	414	amphibole	high	chlorite	moderate	coarse	-	-			12.80
Al-4082	4082-2008	dike	2942.0	-22.973	-111.878	7350	4870	262	amphibole	moderate	chlorite	moderate	coarse	-	quartz/chlorite/epidote/amphibole	1.68	1.73	12.00	0.14
Al-4086	4086-1711	dike	3095.0	-22.969	-111.882	6933	5324	359	amphibole	high	amphibole	high	medium	-	chlorite/feldspar	0.67	0.67	12.03	0.06	3.1
Al-4086	4086-1740	dike	3073.0	-22.969	-111.882	6988	5274	337	amphibole	moderate	amphibole	high	medium	chlorite/amphibole/Fe-Cu-sulphide	-	4.82	4.87	14.38	0.34	2.6	2.9
Al-4086	4086-1905	dike	2893.0	-22.969	-111.879	7026	5463											13.49