Citation:

PANGAEA.981262 (dataset in review)

Abstract:

The Neodymium (Nd) isotopic signature (εNd) has been widely used as a proxy to reconstruct past ocean circulation. Recently it has been increasingly questioned which archives can be reliably used to extract authigenic εNd used for the reconstruction of past ocean circulation and under which environmental conditions bottom seawater εNd are altered and the original water mass signature is overprinted. Pore waters of marine sediments are the key environment in which early diagenetic exchange processes between seawater-derived Nd and terrigenous solid phases take place. This dataset contains dissolved rare earth element and yttrium (REY) concentrations of pore water and bottom water from the abyssal Pacific Ocean.

Samples were collected during cruises SO239 in 2015, SO240 in 2015, SO268 in 2019, and SO295 in 2022. Seawater samples were taken with NISKIN or GoFlo bottles attached to a CTD water sampling carousel or a bottom water sampler. Pore waters were sampled from MUC liners and for some samples several liners were pooled to acquire sufficient volume for REY analyses. Sediments were centrifuged and the supernatant (i.e., the pore water) and the MUC bottom water were filtered through 0.2 µm pore size by different techniques (polyethersylfone (PES) syringe filters, cellulose acetate (CA) syringe filters, CA membrane filters using a water jet pump). These different filtration methods lead to comparable results. Pore water and seawater was preserved by acidification to ~ pH 1.8 with concentrated ultrapure HCl.

REY were preconcentrated offline using a seaFAST (Elemental Scientific Inc., Nebraska, USA) with a 10 mL sample loop and using a NOBIAS PA-1 resin column. Samples were spiked with 100 ppt Tm and In to monitor yields and all REY were Tm corrected at the end of the data evaluation. Correction was usually within 5-15%. Preconcentrated samples were measured on a Thermo Fisher Element HR-ICP-MS (GEOMAR, Kiel) coupled to a CETAC Aridus 2 desolvating nebulizer for increased sensitivity and decreased oxide formation.

Project(s):

JPI Oceans - Ecological Aspects of Deep-Sea Mining (JPIO-MiningImpact)

Funding:

German Research Foundation (DFG), grant/award no. 458637508: Early diagenetic alteration of rare earth element and yttrium (REY) signals in marine sediments and impact on the use of REY as tracers in past and present marine environments

Coverage:

Median Latitude: 12.695811 * Median Longitude: -120.357167 * South-bound Latitude: 11.859650 * West-bound Longitude: -125.915920 * North-bound Latitude: 14.019020 * East-bound Longitude: -117.014000

Date/Time Start: 2019-04-22T08:45:46 * Date/Time End: 2022-12-17T14:54:09

Minimum Elevation: -4529.0 m * Maximum Elevation: -4082.8 m

Event(s):

SO268/2_151-1 (CTD-14) * Latitude: 14.019017 * Longitude: -125.915817 * Date/Time: 2019-04-22T08:45:46 * Elevation: -4520.6 m * Location: Clarion-Clipperton Fraction Zone, North East Pacific Ocean * Campaign: * Basis: * Method/Device: (CTD-RO) * Comment: BEL Reference; Position USBL

SO295_31-1 * Latitude: 11.930120 * Longitude: -117.026750 * Date/Time: 2022-11-12T06:12:51 * Elevation: -4085.0 m * Campaign: (Nodule Monit. II) * Basis: * Method/Device: (CTD-RO)

SO295_37-1 * Latitude Start: 11.929970 * Longitude Start: -117.026850 * Latitude End: 11.930050 * Longitude End: -117.028250 * Date/Time Start: 2022-11-13T05:32:13 * Date/Time End: 2022-11-13T12:08:55 * Campaign: (Nodule Monit. II) * Basis: * Method/Device: Bottom water sampler (BWS)

Parameter(s):

#	Name	Short Name	Unit
1	Event label	Event
2	Date/Time of event	Date/Time
3	Latitude of event	Latitude
4	Longitude of event	Longitude
5	Station label	Station
6	Depth, bathymetric	Bathy depth	m
7	Height above sea floor/altitude	Height above sea floor	m
8	Sample code/label	Sample label
9	Filter	Filter
10	Yttrium	Y	µg/kg
11	Lanthanum	La	µg/kg
12	Cerium	Ce	µg/kg
13	Praseodymium	Pr	µg/kg
14	Neodymium	Nd	µg/kg
15	Samarium	Sm	µg/kg
16	Europium	Eu	µg/kg
17	Gadolinium	Gd	µg/kg
18	Terbium	Tb	µg/kg
19	Dysprosium	Dy	µg/kg
20	Holmium	Ho	µg/kg
21	Erbium	Er	µg/kg
22	Ytterbium	Yb	µg/kg
23	Lutetium	Lu	µg/kg

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

158 data points

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