Citation:

PANGAEA.954696

Name: Thorium isotopes measurements inside internal layers of manganese deposits from the South Pacific Ocean
Published: 2023-01-20
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Geochemistry; manganese micronodule; manganese nodule; ocean; sediment

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Abstract:

The ratio of 230 Thorium excess over 232 Thorium isotopes has been determined for different layered deposit zones inside ferromanganese nodules and crusts retrieved in the South Pacific Ocean during various R/V Eltanin cruises. Samples were prepared from the nodules and crusts by peeling or scraping successive layers and measuring the resultant decrease in thickness with calipers. The samples were then ground to a fine powder and split into two aliquots, one for U and Th isotopic analysis, the other for elemental analysis. The Thorium was extracted using Thenoyltrifluoroacetone (TTA) and measured using Alpha-particle spectroscopy.

Keyword(s):

Geochemistry; manganese micronodule; manganese nodule; ocean; sediment

Related to:

Krämer, Tom; Schornick, James C (1974): Comparison of elemental accumulation rates between ferromanganese deposits and sediments in the South Pacific Ocean. Chemical Geology, 13(3), 187-196, https://doi.org/10.1016/0009-2541(74)90019-9

Krämer, Tom; Schornick, James C (2023): Chemical composition of the internal layers of manganese deposits from the South Pacific Ocean. PANGAEA, https://doi.org/10.1594/PANGAEA.954698

Source:

Grant, John Bruce; Moore, Carla J; Alameddin, George; Chen, Kuiying; Barton, Mark (1992): The NOAA and MMS Marine Minerals Geochemical Database. National Geophysical Data Center, NOAA, https://doi.org/10.7289/V52Z13FT

Further details:

Warnken, Robin R; Virden, William T; Moore, Carla J (1992): The NOAA and MMS Marine Minerals Bibliography. National Geophysical Data Center, NOAA, https://doi.org/10.7289/V53X84KN

Project(s):

NOAA and MMS Marine Minerals Geochemical Database (NOAA-MMS)

Coverage:

Median Latitude: -46.470833 * Median Longitude: -98.075000 * South-bound Latitude: -59.033330 * West-bound Longitude: -134.300000 * North-bound Latitude: -33.050000 * East-bound Longitude: -67.300000

Date/Time Start: 1962-10-01T00:00:00 * Date/Time End: 1966-01-01T00:00:00

Minimum DEPTH, sediment/rock: 0.00 m * Maximum DEPTH, sediment/rock: 0.03 m

Event(s):

ELT05.004SS-RD * Latitude: -59.033330 * Longitude: -67.300000 * Date/Time: 1962-10-01T00:00:00 * Elevation: -3475.0 m * Location: South Pacific Ocean * Campaign: * Basis: Eltanin * Method/Device: Dredge, rock (DRG_R) * Comment: Institute: ARFFSU

ELT15.013-PC * Latitude: -57.833000 * Longitude: -108.650000 * Date/Time: 1964-01-01T00:00:00 * Elevation: -4589.0 m * Recovery: 4 m * Location: Southern Ocean * Campaign: * Basis: Eltanin * Method/Device: Piston corer (PC)

ELT21.004-BT * Latitude: -33.050000 * Longitude: -82.050000 * Date/Time: 1965-01-01T00:00:00 * Elevation: -3877.0 m * Location: Southern Ocean * Campaign: * Basis: Eltanin * Method/Device: Trawl net (TRAWL)

Comment:

From 1983 until 1989 NOAA-NCEI compiled the NOAA-MMS Marine Minerals Geochemical Database from journal articles, technical reports and unpublished sources from other institutions. At the time it was the most extended data compilation on ferromanganese deposits world wide. Initially published in a proprietary format incompatible with present day standards it was jointly decided by AWI and NOAA to transcribe this legacy data into PANGAEA. This transfer is augmented by a careful checking of the original sources when available and the encoding of ancillary information (sample description, method of analysis...) not present in the NOAA-MMS database.

This dataset represents the digitized T1, p. 189 of the related publication.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event		Krämer, Tom
2	Latitude of event	Latitude		Krämer, Tom
3	Longitude of event	Longitude		Krämer, Tom
4	Elevation of event	Elevation	m	Krämer, Tom
5	Identification	ID		Krämer, Tom
6	Deposit type	Deposit type		Krämer, Tom
7	DEPTH, sediment/rock	Depth sed	m	Krämer, Tom		Geocode
8	Distance	Dist	mm	Krämer, Tom		from outer layer/surface
9	Distance, minimum	Dist min	mm	Krämer, Tom		from outer layer/surface
10	Distance, maximum	Dist max	mm	Krämer, Tom		from outer layer/surface
11	Thorium-230 excess/Thorium-232 activity ratio	(230Th xs/232Th)		Krämer, Tom	Alpha-particle spectroscopy	unit given as "(dphpg)" in the publication
12	Thorium-230 excess/Thorium-232 activity ratio, standard deviation	(230Th xs/232Th) std dev	±	Krämer, Tom	Alpha-particle spectroscopy

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

147 data points

Data

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

1 Event	2 Latitude	3 Longitude	4 Elevation [m]	5 ID	6 Deposit type	7 Depth sed [m]	8 Dist [mm]	9 Dist min [mm]	10 Dist max [mm]	11 (230Th xs/232Th)	12 (230Th xs/232Th) std dev [±]
ELT05.004SS-RD	-59.0333	-67.3000	-3475	ELT05.004SS-RD-1KSa	Mn nodule	0.00	0.50	0.0	1.0	12.20	1.30
ELT05.004SS-RD	-59.0333	-67.3000	-3475	ELT05.004SS-RD-1KSb	Mn nodule	0.00	1.50	1.0	2.0	0.68	0.07
ELT05.004SS-RD	-59.0333	-67.3000	-3475	ELT05.004SS-RD-1KSc	Mn nodule	0.00	3.00	2.0	4.0	0.53	0.06
ELT05.004SS-RD	-59.0333	-67.3000	-3475	ELT05.004SS-RD-1KSd	Mn nodule	0.00	5.50	4.0	7.0	0.17	0.04
ELT05.004SS-RD	-59.0333	-67.3000	-3475	ELT05.004SS-RD-1KSe	Mn nodule	0.00	8.00	7.0	9.0	0.01	0.02
ELT15.013-PC	-57.8330	-108.6500	-4589	ELT15.013-PC-1KSa	Mn crust	0.03	0.50	0.0	1.0	36.97	2.90
ELT15.013-PC	-57.8330	-108.6500	-4589	ELT15.013-PC-1KSb	Mn crust	0.03	1.50	1.0	2.0	16.23	1.60
ELT15.013-PC	-57.8330	-108.6500	-4589	ELT15.013-PC-1KSc	Mn crust	0.03	2.35	2.0	2.7	12.40	1.30
ELT21.004-BT	-33.0500	-82.0500	-3877	ELT21.004-BT-2KSa	Mn crust	0.00	0.50	0.0	1.0	31.36	3.40
ELT21.004-BT	-33.0500	-82.0500	-3877	ELT21.004-BT-2KSb	Mn crust	0.00	1.25	1.0	1.5	19.26	3.20
ELT21.004-BT	-33.0500	-82.0500	-3877	ELT21.004-BT-2KSc	Mn crust	0.00	1.80	1.5	2.1	8.20	1.20
ELT21.004-BT	-33.0500	-82.0500	-3877	ELT21.004-BT-2KSd	Mn crust	0.00	2.35	2.1	2.6	6.21	1.10
ELT21.004-BT	-33.0500	-82.0500	-3877	ELT21.004-BT-2KSe	Mn crust	0.00	2.75	2.6	2.9	2.64	0.30
ELT24.015-RS	-35.9670	-134.3000	-4696	ELT24.015-RS-1KSa	Mn crust	0.00	0.50	0.0	1.0	11.72	1.40
ELT24.015-RS	-35.9670	-134.3000	-4696	ELT24.015-RS-1KSb	Mn crust	0.00	1.50	1.0	2.0	2.12	0.40
ELT24.015-RS	-35.9670	-134.3000	-4696	ELT24.015-RS-1KSc	Mn crust	0.00	2.50	2.0	3.0	0.33	0.20
ELT24.015-RS	-35.9670	-134.3000	-4696	ELT24.015-RS-2KSa	Mn nodule	0.00	0.25	0.0	0.5	11.94	2.80
ELT24.015-RS	-35.9670	-134.3000	-4696	ELT24.015-RS-2KSb	Mn nodule	0.00	0.90	0.5	1.3	3.74	0.50
ELT24.015-RS	-35.9670	-134.3000	-4696	ELT24.015-RS-2KSc	Mn nodule	0.00	1.65	1.3	2.0	1.58	0.35
ELT24.015-RS	-35.9670	-134.3000	-4696	ELT24.015-RS-2KSd	Mn nodule	0.00	2.30	2.0	2.6	0.89	0.35
ELT24.015-RS	-35.9670	-134.3000	-4696	ELT24.015-RS-2KSe	Mn nodule	0.00	2.95	2.6	3.3	0.45	0.15