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Liebetrau, Volker; Krause, Stefan (2014): U-Th isotope systematics and light stable isotope data of carbonate enriched sediments at MASOX and HyBIS sites (methane seepage off Svalbard) from JAGO dives during cruise Maria S. Merian MSM21/4 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.825734, In supplement to: Berndt, Christian; Feseker, Tomas; Treude, Tina; Krastel, Sebastian; Liebetrau, Volker; Niemann, Helge; Bertics, Victoria J; Dumke, Ines; Dünnbier, Karolin; Ferre, Benedicte; Graves, Carolyn; Gross, Felix; Hissmann, Karen; Hühnerbach, Veit; Krause, Stefan; Lieser, Kathrin; Schauer, Jürgen; Steinle, Lea (2014): Temporal constraints on hydrate-controlled methane seepage off Svalbard. Published Online January 2 2014, Science, https://doi.org/10.1126/science.1246298

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Coverage:
Median Latitude: 78.584373 * Median Longitude: 9.447790 * South-bound Latitude: 78.555830 * West-bound Longitude: 9.420830 * North-bound Latitude: 78.612830 * East-bound Longitude: 9.473500
Date/Time Start: 2012-08-23T18:41:00 * Date/Time End: 2012-08-25T13:15:59
Minimum DEPTH, sediment/rock: 0.05 m * Maximum DEPTH, sediment/rock: 0.05 m
Event(s):
MSM21/4_579-1  * Latitude Start: 78.555830 * Longitude Start: 9.473500 * Latitude End: 78.557000 * Longitude End: 9.471000 * Date/Time Start: 2012-08-23T18:41:00 * Date/Time End: 2012-08-23T22:02:59 * Location: North Greenland Sea * Campaign: MSM21/4 * Basis: Maria S. Merian * Method/Device: Submersible JAGO (JAGO)
MSM21/4_597-1  * Latitude Start: 78.611830 * Longitude Start: 9.425830 * Latitude End: 78.612830 * Longitude End: 9.420830 * Date/Time Start: 2012-08-25T08:13:00 * Date/Time End: 2012-08-25T13:15:59 * Elevation Start: -380.5 m * Elevation End: -396.5 m * Location: North Greenland Sea * Campaign: MSM21/4 * Basis: Maria S. Merian * Method/Device: Submersible JAGO (JAGO)
Comment:
Values with # mark highly unreliable ages characterized by uncertainties larger than the deduced age or even dominated by 230Th correction values as well as isochron approaches based just on 2-point reference lines. Therefore, the latter may not provide any proof for the petrographic postulation of cogenetic origin.
Uncertainties presented on 2 sigma level.
HyBIS U-measurements were performed on Quadrupole Inductively Coupled Plasma Mass Spectrometer (Q-ICP-MS) on limited precision level.
Note 1: The sample weight represents the analysed amount dissolved in 4 N Acetic Acid and 2.25 N HNO3 (marked by -2), respectively, at room temperature over 2 hours. Remaining material was 2 x centrifuged, dried down and weighed for recalculation of the dissolved sample weight.
Note 2: The equivalent percentage of the analysed non-silicate fraction represented by the sample weight. X-ray diffraction analyses indicated aragonite as the main non-silicate and easily dissolvable phase.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 Event labelEvent
2 Latitude of eventLatitude
3 Longitude of eventLongitude
4 DEPTH, sediment/rockDepth sedmGeocode
5 Depth, top/minDepth topmKrause, Stefan
6 Depth, bottom/maxDepth botmKrause, Stefan
7 Sample code/labelSample labelKrause, Stefanleachate mode in brackets
8 LocationLocationKrause, Stefan
9 DescriptionDescriptionKrause, Stefan
10 Sample massSamp mmgLiebetrau, Volkers. note 1
11 non-silicates, totalnon silic tot%Liebetrau, Volkers. note 2
12 Age, datedAge datedkaLiebetrau, VolkerMC-ICP-MS, isotope dilution
13 Age, errorAge e±Liebetrau, VolkerMC-ICP-MS, isotope dilution
14 Uranium-238238Umg/kgLiebetrau, VolkerMC-ICP-MS, isotope dilution
15 Error, absoluteError a±Liebetrau, VolkerMC-ICP-MS, isotope dilution
16 Thorium-232232Thmg/kgLiebetrau, VolkerMC-ICP-MS, isotope dilution
17 Error, absoluteError a±Liebetrau, VolkerMC-ICP-MS, isotope dilution
18 Uranium-234/Uranium-238 activity ratio(234U/238U)Liebetrau, VolkerMC-ICP-MS, isotope dilutiondelta234U(o) (meas. 234U/238U act. ratio -1) * 1000 at time 0 (today)
19 Uranium-234/Uranium-238 activity ratio, error, absolute(234U/238U) e±Liebetrau, VolkerMC-ICP-MS, isotope dilution
20 Thorium-230/Thorium-232 activity ratio(230Th/232Th)Liebetrau, VolkerMC-ICP-MS, isotope dilution
21 Error, absoluteError a±Liebetrau, VolkerMC-ICP-MS, isotope dilution
22 Uranium-238/Thorium-232 activity ratio(238U/232Th)Liebetrau, VolkerMC-ICP-MS, isotope dilution
23 Error, absoluteError a±Liebetrau, VolkerMC-ICP-MS, isotope dilution
24 Thorium-230/Uranium-234 activity ratio(230Th/234U)Liebetrau, VolkerMC-ICP-MS, isotope dilution230Th/234U activity ratio corrected for inherited 230Th by application of 230Th/232Th activity ratio of 0.75 ± 0.2 as continental crust average value (according to Wedepohl, 1995)
25 Error, absoluteError a±Liebetrau, VolkerMC-ICP-MS, isotope dilution
26 Uranium-234/Uranium-238 activity ratio(234U/238U)Liebetrau, VolkerCalculateddelta234U(t)(234U/238U act. ratio at zero age -1) * 1000 at time (t = U/Th-age)
Measured 234U/238U back-calculated for 234U decay since carbonate precipitation, based on the individual U/Th ingrowth age and half-lives measured by Cheng et al. (2000).
27 Uranium-234/Uranium-238 activity ratio, error, absolute(234U/238U) e±Liebetrau, VolkerCalculated
28 δ13C, carbonateδ13C carb‰ PDBLiebetrau, VolkerMass spectrometer, Finnigan, MAT 253with respect to VPDB
29 Error, absoluteError a±Liebetrau, VolkerMass spectrometer, Finnigan, MAT 253
30 δ18O, carbonateδ18O carb‰ PDBLiebetrau, VolkerMass spectrometer, Finnigan, MAT 253with respect to VPDB
31 Error, absoluteError a±Liebetrau, VolkerMass spectrometer, Finnigan, MAT 253
32 CarbonatesCarbKrause, StefanX-ray diffractometry (Philips PW1710)
33 Sample code/labelSample labelLiebetrau, VolkerFor sub-samples postulated of cogenetic origin by petrographic observations the isoplot 3.75 software of the Berkeley Geochronology Center, CA, USA is applyied for isochron age estimates.
34 Uranium-234/Uranium-238 activity ratio(234U/238U)Liebetrau, VolkerCalculateddelta234U(t)(234U/238U act. ratio at zero age -1) * 1000 at time (t = U/Th-age)
Measured 234U/238U back-calculated for 234U decay since carbonate precipitation, based on the individual U/Th ingrowth age and half-lives measured by Cheng et al. (2000).
delta234U(t) of Rosholt-1 isochron approaches based on isoplot 3.75 calculation.
35 Uranium-234/Uranium-238 activity ratio, error, absolute(234U/238U) e±Liebetrau, VolkerCalculated
36 Age modelAge modelkaLiebetrau, VolkerAge estimates applying the Rosholt-1 isochron approach in 3 dimensional projection according data reduction system after Ludwig (2008).
37 Age, errorAge e±Liebetrau, Volker
38 Age modelAge modelkaLiebetrau, VolkerAge estimates applying the Osmond isochron approach according data reduction system after Ludwig (2008).
39 Age, errorAge e±Liebetrau, Volker
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
119 data points

Data

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

1 
Event		2 
Latitude		3 
Longitude		4 
Depth sed [m]		5 
Depth top [m]		6 
Depth bot [m]		7 
Sample label
(leachate mode in brackets)		8 
Location		9 
Description		10 
Samp m [mg]
(s. note 1)		11 
non silic tot [%]
(s. note 2)		12 
Age dated [ka]
(MC-ICP-MS, isotope dilution)		13 
Age e [±]
(MC-ICP-MS, isotope dilution)		14 
238U [mg/kg]
(MC-ICP-MS, isotope dilution)		15 
Error a [±]
(MC-ICP-MS, isotope dilution)		16 
232Th [mg/kg]
(MC-ICP-MS, isotope dilution)		17 
Error a [±]
(MC-ICP-MS, isotope dilution)		18 
(234U/238U)
(delta234U(o) (meas. 234U/238U...)		19 
(234U/238U) e [±]
(MC-ICP-MS, isotope dilution)		20 
(230Th/232Th)
(MC-ICP-MS, isotope dilution)		21 
Error a [±]
(MC-ICP-MS, isotope dilution)		22 
(238U/232Th)
(MC-ICP-MS, isotope dilution)		23 
Error a [±]
(MC-ICP-MS, isotope dilution)		24 
(230Th/234U)
(230Th/234U activity ratio cor...)		25 
Error a [±]
(MC-ICP-MS, isotope dilution)		26 
(234U/238U)
(delta234U(t)(234U/238U act. r...)		27 
(234U/238U) e [±]
(Calculated)		28 
δ13C carb [‰ PDB]
(with respect to VPDB, Mass sp...)		29 
Error a [±]
(Mass spectrometer, Finnigan, ...)		30 
δ18O carb [‰ PDB]
(with respect to VPDB, Mass sp...)		31 
Error a [±]
(Mass spectrometer, Finnigan, ...)		32 
Carb
(X-ray diffractometry (Philips...)		33 
Sample label
(For sub-samples postulated of...)		34 
(234U/238U)
(delta234U(t)(234U/238U act. r...)		35 
(234U/238U) e [±]
(Calculated)		36 
Age model [ka]
(Age estimates applying the Ro...)		37 
Age e [±]		38 
Age model [ka]
(Age estimates applying the Os...)		39 
Age e [±]
MSM21/4_579-1 78.55589.47350.050.00.1SV-28 (weak)MASOXconcretionary dark matrix23.71243.40.317.7300.100.6770.00131.92.43.540.0380.320.640.0310000000.00133.22.6-31.950.013.700.03Aragonite & not identifiedSV-28 & SV-29125.83.9#2.50#0.1#2.80#0.1
MSM21/4_579-178.55589.47350.050.00.1SV-29 (weak)MASOXcarbonate domin. concret.16.23675.01.16.3760.040.6880.00144.91.92.210.0228.430.240.0448231740.01146.92.4-36.520.014.830.01Aragonite & not identified
MSM21/4_597-1 78.61189.42580.050.00.1SV-2 (strong)HyBIScarbonate domin. concret.2.53408.20.516.6000.140.9570.01132.821.05.120.0753.000.610.0730000000.00136.021.3-37.100.014.200.03Aragonite & not identified
MSM21/4_597-178.61189.42580.050.00.1SV-3 (strong)HyBIScarbonate domin. concret.4.55584.60.59.6000.080.5270.00158.222.83.440.0456.000.600.0420000000.00160.223.1-37.200.013.870.01Aragonite & not identified