Citation:

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: * Basis: * Method/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):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, sediment/rock	Depth sed	m			Geocode
2	Depth, top/min	Depth top	m	Krause, Stefan
3	Depth, bottom/max	Depth bot	m	Krause, Stefan
4	Sample code/label	Sample label		Krause, Stefan		leachate mode in brackets
5	Location	Location		Krause, Stefan
6	Description	Description		Krause, Stefan
7	Sample mass	Samp m	mg	Liebetrau, Volker		s. note 1
8	non-silicates, total	non silic tot	%	Liebetrau, Volker		s. note 2
9	Age, dated	Age dated	ka	Liebetrau, Volker	MC-ICP-MS, isotope dilution
10	Age, error	Age e	±	Liebetrau, Volker	MC-ICP-MS, isotope dilution
11	Uranium-238	238U	mg/kg	Liebetrau, Volker	MC-ICP-MS, isotope dilution
12	Error, absolute	Error a	±	Liebetrau, Volker	MC-ICP-MS, isotope dilution
13	Thorium-232	232Th	mg/kg	Liebetrau, Volker	MC-ICP-MS, isotope dilution
14	Error, absolute	Error a	±	Liebetrau, Volker	MC-ICP-MS, isotope dilution
15	Uranium-234/Uranium-238 activity ratio	(234U/238U)		Liebetrau, Volker	MC-ICP-MS, isotope dilution	delta234U(o) (meas. 234U/238U act. ratio -1) * 1000 at time 0 (today)
16	Uranium-234/Uranium-238 activity ratio, error, absolute	(234U/238U) e	±	Liebetrau, Volker	MC-ICP-MS, isotope dilution
17	Thorium-230/Thorium-232 activity ratio	(230Th/232Th)		Liebetrau, Volker	MC-ICP-MS, isotope dilution
18	Error, absolute	Error a	±	Liebetrau, Volker	MC-ICP-MS, isotope dilution
19	Uranium-238/Thorium-232 activity ratio	(238U/232Th)		Liebetrau, Volker	MC-ICP-MS, isotope dilution
20	Error, absolute	Error a	±	Liebetrau, Volker	MC-ICP-MS, isotope dilution
21	Thorium-230/Uranium-234 activity ratio	(230Th/234U)		Liebetrau, Volker	MC-ICP-MS, isotope dilution	230Th/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)
22	Error, absolute	Error a	±	Liebetrau, Volker	MC-ICP-MS, isotope dilution
23	Uranium-234/Uranium-238 activity ratio	(234U/238U)		Liebetrau, Volker	Calculated	delta234U(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).
24	Uranium-234/Uranium-238 activity ratio, error, absolute	(234U/238U) e	±	Liebetrau, Volker	Calculated
25	δ13C, carbonate	δ13C carb	‰ PDB	Liebetrau, Volker	Mass spectrometer, Finnigan, MAT 253	with respect to VPDB
26	Error, absolute	Error a	±	Liebetrau, Volker	Mass spectrometer, Finnigan, MAT 253
27	δ18O, carbonate	δ18O carb	‰ PDB	Liebetrau, Volker	Mass spectrometer, Finnigan, MAT 253	with respect to VPDB
28	Error, absolute	Error a	±	Liebetrau, Volker	Mass spectrometer, Finnigan, MAT 253
29	Carbonates	Carb		Krause, Stefan	X-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.
30	Sample code/label	Sample label		Liebetrau, Volker		For 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.
31	Uranium-234/Uranium-238 activity ratio	(234U/238U)		Liebetrau, Volker	Calculated	delta234U(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.
32	Uranium-234/Uranium-238 activity ratio, error, absolute	(234U/238U) e	±	Liebetrau, Volker	Calculated
33	Age model	Age model	ka	Liebetrau, Volker		Age estimates applying the Rosholt-1 isochron approach in 3 dimensional projection according data reduction system after Ludwig (2008).
34	Age, error	Age e	±	Liebetrau, Volker
35	Age model	Age model	ka	Liebetrau, Volker		Age estimates applying the Osmond isochron approach according data reduction system after Ludwig (2008).
36	Age, error	Age e	±	Liebetrau, Volker

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

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281 data points

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