Thorium isotopes measurements inside internal layers of manganese deposits from the South Pacific Ocean

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...

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Bibliographic Details
Main Authors: Krämer, Tom, Schornick, James C
Format: Dataset
Language:English
Published: PANGAEA 2023
Subjects:
Alpha-particle spectroscopy
Deposit type
DEPTH
sediment/rock
Distance
maximum
minimum
Dredge
rock
DRG_R
Elevation of event
ELT05
ELT05.004SS-RD
ELT15
ELT15.013-PC
ELT21
ELT21.004-BT
ELT24
ELT24.015-RS
Eltanin
Event label
Geochemistry
Identification
Latitude of event
Longitude of event
manganese micronodule
manganese nodule
NOAA and MMS Marine Minerals Geochemical Database
NOAA-MMS
ocean
PC
Piston corer
sediment
Southern Ocean
South Pacific Ocean
Thorium-230 excess/Thorium-232 activity ratio
standard deviation
TRAWL
Trawl net
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.954696
https://doi.org/10.1594/PANGAEA.954696
Description
Summary: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.

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