Citation:

PANGAEA.974825

Name: Uranium-Thorium analysis from IODP Site 323-U1340
Published: 2025-02-13
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Age model; biogenic opal; Diatom assemblage; nitrogen content; Silicon isotopes; Uranium-Thorium

Always quote citation above when using data! You can download the citation in several formats below.

Published: 2025-02-13 • DOI registered: 2025-03-14

RIS Citation BibTeX Citation Text Citation Copy Citation ShareShow Map Google Earth

Abstract:

The Bølling-Allerød deglacial event is marked by high diatom productivity and opal deposition throughout the subarctic Pacific. To investigate the cause of this event, we quantified several productivity-related sedimentary parameters that reflect the near-surface biogeochemistry from the Integrated Ocean Drilling Program (IODP) Site 323-U1340 in the Bering Sea. Uranium-Thorium analysis was conducted via isotope dilution analysis in the Marcantonio lab at Texas A&M University. 0.3-0.4 g of sediment were spiked with 229Th and 236U, acid digested, separated and purified via anion exchange chromatography as outlined in Loveley et al. (2017), and measured on an Element XR magnetic sector ICPMS (Fleisher & Anderson, 2003; doi:10.1016/S0967-0645(02)00591-X).

Keyword(s):

Age model; biogenic opal; Diatom assemblage; nitrogen content; Silicon isotopes; Uranium-Thorium

Supplement to:

deLong, Kimberly; Blackburn, Terrence; Caissie, Beth; Addison, Jason A; Stroynowski, Zuzanna N; Reimi Sipala, Maria; Marcantonio, Franco; Ravelo, Ana Christina (accepted): Bolling-Allerod Productivity in the Subarctic Pacific Driven by Seasonal Upwelling. Geophysical Research Letters

Coverage:

Median Latitude: 53.398896 * Median Longitude: -179.521415 * South-bound Latitude: 53.396673 * West-bound Longitude: -179.521623 * North-bound Latitude: 53.400013 * East-bound Longitude: -179.521000

Date/Time Start: 2009-07-22T00:00:00 * Date/Time End: 2009-07-22T00:00:00

Minimum Elevation: -1294.7 m * Maximum Elevation: -1293.4 m

Event(s):

323-U1340 * Latitude: 53.400000 * Longitude: -179.521000 * Date/Time: 2009-07-22T00:00:00 * Elevation: -1294.0 m * Location: Bering Sea * Campaign: (Bering Sea Paleoceanography) * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE)

323-U1340A * Latitude: 53.400013 * Longitude: -179.521622 * Elevation: -1294.7 m * Recovery: 535.91 m * Campaign: (Bering Sea Paleoceanography) * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 71 cores; 604.5 m cored; 89 % recovered

323-U1340D * Latitude: 53.396673 * Longitude: -179.521623 * Elevation: -1293.4 m * Recovery: 27.23 m * Campaign: (Bering Sea Paleoceanography) * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 3 cores; 26.3 m cored; 104 % recovered

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event		deLong, Kimberly
2	Sample code/label	Sample label		deLong, Kimberly	DSDP/ODP/IODP sample designation
3	Half	Half		deLong, Kimberly
4	Depth, composite	Depth comp	mcd	deLong, Kimberly	IODP Depth Scale Terminology
5	AGE	Age	ka BP	deLong, Kimberly	Age, 14C calibrated, CALIB (Stuiver & Reimer, 1993)	Geocode
6	Thorium-230, activity	230Th act	dpm/g	deLong, Kimberly	Uranium-thorium isotope dilution measurement by MC-ICPMS
7	Thorium-232, activity	232Th act	dpm/g	deLong, Kimberly	Uranium-thorium isotope dilution measurement by MC-ICPMS
8	Uranium-234, activity	234U act	dpm/g	deLong, Kimberly	Uranium-thorium isotope dilution measurement by MC-ICPMS
9	Uranium-238, activity	238U act	dpm/g	deLong, Kimberly	Uranium-thorium isotope dilution measurement by MC-ICPMS
10	Uranium-234/Uranium-238 activity ratio	(234U/238U)		deLong, Kimberly	Uranium-thorium isotope dilution measurement by MC-ICPMS
11	Uranium-234/Thorium ratio	234U/Th		deLong, Kimberly	Uranium-thorium isotope dilution measurement by MC-ICPMS	Detrital
12	Uranium, authigenic	U auth	dpm/g	deLong, Kimberly	Uranium-thorium isotope dilution measurement by MC-ICPMS
13	Thorium-230 ingrowth, decay-products	230Th in 0 prod		deLong, Kimberly	Uranium-thorium isotope dilution measurement by MC-ICPMS
14	Thorium-230 excess, decay-corrected	230Th xs,0	dpm/g	deLong, Kimberly	Uranium-thorium isotope dilution measurement by MC-ICPMS
15	Thorium-230, initial	230Th initial	dpm/g	deLong, Kimberly	Uranium-thorium isotope dilution measurement by MC-ICPMS
16	Thorium-230, flux normalized	230Th flux norm	g/cm²/ka	deLong, Kimberly	Uranium-thorium isotope dilution measurement by MC-ICPMS
17	Thorium-232, flux normalized	232Th flux norm	g/cm²/ka	deLong, Kimberly	Uranium-thorium isotope dilution measurement by MC-ICPMS
18	Accumulation rate, uranium, authigenic	Acc rate U auth	dpm/cm²/ka	deLong, Kimberly	Uranium-thorium isotope dilution measurement by MC-ICPMS
19	Uranium-238, authigenic	238U auth	µg/g	deLong, Kimberly	Uranium-thorium isotope dilution measurement by MC-ICPMS