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Liebetrau, Volker; Krause, Stefan (2014): U-Th isotope systematics and light stable isotope data of carbonate enriched sediments at MASOX site (methane seepage off Svalbard) at sediment core MSM21/4_657-1. PANGAEA, https://doi.org/10.1594/PANGAEA.826110, 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:
Latitude: 78.555670 * Longitude: 9.473000
Date/Time Start: 2012-09-04T04:45:00 * Date/Time End: 2012-09-04T04:45:00
Minimum DEPTH, sediment/rock: 0.45 m * Maximum DEPTH, sediment/rock: 1.80 m
Event(s):
MSM21/4_657-1 * Latitude: 78.555670 * Longitude: 9.473000 * Date/Time: 2012-09-04T04:45:00 * Elevation: -388.4 m * Location: North Greenland Sea * Campaign: MSM21/4 * Basis: Maria S. Merian * Device: Gravity corer (GC)
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.
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 InvestigatorMethodComment
1DEPTH, sediment/rockDepthmGeocode
2Depth, top/minDepth topmKrause, Stefan
3Depth, bottom/maxDepth botmKrause, Stefan
4Sample code/labelSample labelKrause, Stefanleachate mode in brackets
5LocationLocationKrause, Stefan
6DescriptionDescriptionKrause, Stefan
7Sample massSamp mmgLiebetrau, Volkers. note 1
8non-silicates, totalnon silic tot%Liebetrau, Volkers. note 2
9Age, datedAge datedkaLiebetrau, VolkerMC-ICP-MS, isotope dilution
10Age, errorAge e±Liebetrau, VolkerMC-ICP-MS, isotope dilution
11Uranium 238238Umg/kgLiebetrau, VolkerMC-ICP-MS, isotope dilution
12Error, absoluteError a±Liebetrau, VolkerMC-ICP-MS, isotope dilution
13Thorium 232232Thmg/kgLiebetrau, VolkerMC-ICP-MS, isotope dilution
14Error, absoluteError a±Liebetrau, VolkerMC-ICP-MS, isotope dilution
15Uranium 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)
16Uranium 234/Uranium 238 activity ratio, error, absolute(234U/238U) e±Liebetrau, VolkerMC-ICP-MS, isotope dilution
17Thorium 230/Thorium 232 activity ratio(230Th/232Th)Liebetrau, VolkerMC-ICP-MS, isotope dilution
18Error, absoluteError a±Liebetrau, VolkerMC-ICP-MS, isotope dilution
19Uranium 238/Thorium 232 activity ratio(238U/232Th)Liebetrau, VolkerMC-ICP-MS, isotope dilution
20Error, absoluteError a±Liebetrau, VolkerMC-ICP-MS, isotope dilution
21Thorium 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)
22Error, absoluteError a±Liebetrau, VolkerMC-ICP-MS, isotope dilution
23Uranium 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).
24Uranium 234/Uranium 238 activity ratio, error, absolute(234U/238U) e±Liebetrau, VolkerCalculated
25δ13C, carbonateδ13C carb‰ PDBLiebetrau, VolkerMass spectrometer Finnigan MAT 253with respect to VPDB
26Error, absoluteError a±Liebetrau, VolkerMass spectrometer Finnigan MAT 253
27δ18O, carbonateδ18O carb‰ PDBLiebetrau, VolkerMass spectrometer Finnigan MAT 253with respect to VPDB
28Error, absoluteError a±Liebetrau, VolkerMass spectrometer Finnigan MAT 253
29CarbonateCarbKrause, StefanX-ray diffractometry (Philips PW1710)* Although the applied XRD library identified Kutnohorite it seems to be more appropriate to use the general term disordered dolomite instead, due to partially overlapping XRD spectra within this mineral group.
30Sample 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.
31Uranium 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.
32Uranium 234/Uranium 238 activity ratio, error, absolute(234U/238U) e±Liebetrau, VolkerCalculated
33Age modelAge modelkaLiebetrau, VolkerAge estimates applying the Rosholt-1 isochron approach in 3 dimensional projection according data reduction system after Ludwig (2008).
34Age, errorAge e±Liebetrau, Volker
35Age modelAge modelkaLiebetrau, VolkerAge estimates applying the Osmond isochron approach according data reduction system after Ludwig (2008).
36Age, errorAge e±Liebetrau, Volker
Size:
281 data points

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