Citation:

2009GL038068

Name: Uranium, Thorium and Protactinium isotopes of ODP Site 172-1063
Published: 2009
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Ocean circulation may have undergone reductions and reinvigorations in the past closely tied to regional climate changes. Measurements of 231Pa/230Th ratios in a sediment core from the Bermuda Rise have been interpreted as evidence that the Atlantic Meridional Overturning Circulation (AMOC) was weakened or completely eliminated during a period of catastrophic iceberg discharges (Heinrich-Event 1, H1). Here we present new data from the Bermuda Rise that show further 231Pa/230Th peaks during Heinrich-2 (H2) and Heinrich-3 (H3). Additionally, a tight correlation between diatom abundances (biogenic silica) and 231Pa/230Th is discovered in this core. Our results redirect the interpretation of 231Pa/230Th from the Bermuda Rise as a proxy for ocean circulation towards a proxy that reacts highly sensitive to changes of particle composition and water mass properties.

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Median Latitude: 33.686330 * Median Longitude: -57.615025 * South-bound Latitude: 33.686190 * West-bound Longitude: -57.615110 * North-bound Latitude: 33.686470 * East-bound Longitude: -57.614940

Date/Time Start: 1997-03-28T23:30:00 * Date/Time End: 1997-04-01T06:20:00

Minimum DEPTH, sediment/rock: 2.40 m * Maximum DEPTH, sediment/rock: 15.82 m

Event(s):

172-1063B * Latitude: 33.686470 * Longitude: -57.614940 * Date/Time Start: 1997-03-28T23:30:00 * Date/Time End: 1997-03-31T02:10:00 * Elevation: -4583.0 m * Penetration: 351.6 m * Recovery: 341.95 m * Location: Blake-Bahama Outer Ridge, North Atlantic Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 38 cores; 351.6 m cored; 0 m drilled; 97.3 % recovery

172-1063D * Latitude: 33.686190 * Longitude: -57.615110 * Date/Time: 1997-04-01T06:20:00 * Elevation: -4584.3 m * Penetration: 173.1 m * Recovery: 176.54 m * Location: South Atlantic Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 19 cores; 173.1 m cored; 0 m drilled; 102 % recovery

Comment:

Sediment depth is given in mcd. AGE (ka) is an improvement of an astronomical tuned timescale [Grützner et al., 2002, doi:10.1016/S0025-3227(02)00320-1], now based on high resolution CaCO3 data derived from XRF core scanning. The carbonate record for ODP Site 1063 shows a high similarity to the CaCO3 content in the nearby piston core GPC 5 [Keigwin and Jones, 1994, doi:10.1029/94JC00525]. Correlation of CaCO3 was used to transfer the radiocarbon-based age model of GPC 5 to ODP Site 1063. The 21 radiocarbon dates reported by Keigwin and Jones [1994] for the last 36 kyr have been converted to calendar ages as described by Fairbanks et al. [2005, doi:10.1016/j.quascirev.2005.04.007]. This data sets extends the study by McManus et al. 2004 (doi:10.1038/nature02494) from the nearby core GGC5 back to 35 ka, covering H2 and H3.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event
2	Sample code/label	Sample label		Lippold, Jörg	DSDP/ODP/IODP sample designation
3	DEPTH, sediment/rock	Depth sed	m			Geocode
4	AGE	Age	ka BP			Geocode
5	Protactinium-231/Thorium-230 excess, decay-corrected	231Pa/230Th xs0		Lippold, Jörg	Calculated
6	Protactinium-231/Thorium-230 excess, decay-corrected, error, relative	231Pa/230Th ex,0 e rel	%	Lippold, Jörg	Calculated	2SE
7	Thorium-230	230Th	dpm/g	Lippold, Jörg	Inductively coupled plasma - mass spectrometry (ICP-MS)
8	Thorium-230, error, relative	230Th e rel	%	Lippold, Jörg	Inductively coupled plasma - mass spectrometry (ICP-MS)	2SE
9	Thorium-232	232Th	dpm/g	Lippold, Jörg	Inductively coupled plasma - mass spectrometry (ICP-MS)
10	Thorium-232, error, relative	232Th e rel	%	Lippold, Jörg	Inductively coupled plasma - mass spectrometry (ICP-MS)	2SE
11	Uranium-234	234U	dpm/g	Lippold, Jörg	Inductively coupled plasma - mass spectrometry (ICP-MS)
12	Uranium-234, error, relative	234U e rel	%	Lippold, Jörg	Inductively coupled plasma - mass spectrometry (ICP-MS)	2SE
13	Uranium-238	238U	dpm/g	Lippold, Jörg	Inductively coupled plasma - mass spectrometry (ICP-MS)
14	Uranium-238, error, relative	238U e rel	%	Lippold, Jörg	Inductively coupled plasma - mass spectrometry (ICP-MS)	2SE
15	Protactinium-231	231Pa	dpm/g	Lippold, Jörg	Inductively coupled plasma - mass spectrometry (ICP-MS)
16	Protactinium-231, error, relative	231Pa e rel	%	Lippold, Jörg	Inductively coupled plasma - mass spectrometry (ICP-MS)	2SE

License:

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

Size:

748 data points

Data

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

1 Event	2 Sample label	3 Depth sed [m]	4 Age [ka BP]	5 231Pa/230Th xs0	6 231Pa/230Th ex,0 e rel [%]	7 230Th [dpm/g]	8 230Th e rel [%]	9 232Th [dpm/g]	10 232Th e rel [%]	11 234U [dpm/g]	12 234U e rel [%]	13 238U [dpm/g]	14 238U e rel [%]	15 231Pa [dpm/g]	16 231Pa e rel [%]
172-1063B	172-1063B-1H-2W,70-72	2.40	15.2	0.078	3.6	4.91	2.3	2.51	3.4	1.82	0.7	1.94	0.2	0.30	2.0
172-1063B	172-1063B-1H-2W,90-92	2.60	16.3	0.090	3.0	4.90	0.8	2.79	0.8	1.93	0.7	1.94	0.8	0.32	3.1
172-1063B	172-1063B-1H-2W,110-112	2.80	17.1	0.091	1.3	4.56	0.6	2.73	0.6	1.79	5.0	1.85	7.1	0.30	1.2
172-1063B	172-1063B-1H-2W,130-132	3.00	17.3	0.076	4.9	4.68	3.7	2.27	2.4	1.99	0.7	2.06	0.3	0.27	1.9
172-1063B	172-1063B-1H-3W,5-7	3.25	17.6	0.071	5.0	4.34	3.9	2.18	2.0	1.90	0.7	1.96	0.6	0.24	2.1
172-1063B	172-1063B-1H-3W,20-22	3.40	17.8	0.076	3.1	3.87	0.8	2.74	0.8	1.84	0.8	1.94	0.8	0.22	2.5
172-1063B	172-1063B-1H-3W,40-42	3.60	18.1	0.059	2.5	4.39	0.8	2.65	0.8	1.68	0.8	1.79	0.8	0.21	1.8
172-1063B	172-1063B-1H-3W,60-62	3.80	18.4	0.069	2.3	3.88	0.8	2.79	0.8	1.68	0.8	1.83	0.8	0.20	1.4
172-1063B	172-1063B-1H-3W,80-82	4.00	18.6	0.067	2.1	4.33	0.8	2.69	0.8	1.62	0.8	1.72	0.8	0.22	1.1
172-1063B	172-1063B-1H-3W,100-102	4.20	18.8	0.067	9.6	3.57	5.0	3.23	5.7	1.94	10.3	1.83	6.9	0.18	1.8
172-1063B	172-1063B-1H-3W,120-122	4.40	19.2	0.066	4.7	4.22	3.2	2.30	1.6	1.74	0.7	1.85	0.7	0.22	2.1
172-1063B	172-1063B-1H-3W,140-142	4.60	19.4	0.072	2.3	3.67	0.8	2.32	0.8	1.69	0.8	1.80	0.8	0.20	2.1
172-1063B	172-1063B-1H-4W,10-12	4.80	19.7	0.064	6.5	3.95	4.1	2.45	4.6	1.59	0.7	1.71	0.2	0.20	3.0
172-1063B	172-1063B-1H-4W,30-32	5.00	19.9	0.073	2.1	3.66	0.8	2.18	0.8	1.70	0.8	1.81	0.8	0.20	1.9
172-1063B	172-1063B-1H-4W,50-52	5.20	20.1	0.066	2.9	3.72	0.8	2.71	0.8	1.70	0.6	1.85	0.8	0.19	1.8
172-1063B	172-1063B-1H-4W,70-72	5.40	20.3	0.064	4.7	3.57	2.3	2.48	3.6	1.72	11.6	1.94	10.3	0.18	1.9
172-1063B	172-1063B-1H-4W,90-92	5.60	20.4	0.063	3.0	4.07	0.8	2.71	0.8	1.60	0.6	1.75	0.8	0.20	2.0
172-1063B	172-1063B-1H-4W,110-112	5.80	20.5	0.067	3.2	3.63	1.2	2.46	1.5	1.67	0.6	1.84	0.8	0.19	1.8
172-1063B	172-1063B-1H-4W,130-132	6.00	20.6	0.062	4.4	3.74	2.1	2.58	3.4	1.68	1.1	1.81	0.5	0.18	2.0
172-1063B	172-1063B-1H-5W,40-42	6.60	21.1	0.063	7.0	3.28	4.5	2.37	2.8	1.59	0.8	1.74	0.2	0.16	2.1
172-1063B	172-1063B-1H-5W,100-102	7.20	21.6	0.064	6.1	2.75	3.0	2.47	2.5	1.65	1.0	1.94	0.3	0.14	1.3
172-1063D	172-1063D-2H-3W,110-112	7.78	22.2	0.061	5.2	3.37	2.1	2.66	3.7	1.69	0.6	1.85	0.2	0.16	2.0
172-1063D	172-1063D-2H-4W,20-22	8.38	22.9	0.067	7.6	3.01	4.2	2.39	3.6	1.30	2.1	2.00	0.8	0.15	1.9
172-1063D	172-1063D-2H-4W,80-82	8.98	23.5	0.064	6.7	3.22	0.5	2.80	0.4	1.66	81.9	1.97	39.0	0.16	1.8
172-1063D	172-1063D-2H-4W,140-142	9.58	23.9	0.066	4.6	3.05	1.1	2.74	2.1	1.48	13.9	1.72	0.5	0.15	2.3
172-1063D	172-1063D-2H-5W,24-26	9.91	24.2	0.062	4.5	2.52	0.8	2.93	0.8	1.72	0.6	1.95	0.8	0.12	1.6
172-1063D	172-1063D-2H-5W,40-42	10.08	24.4	0.087	3.6	2.97	0.8	2.62	0.8	1.50	0.7	1.73	0.8	0.17	1.6
172-1063D	172-1063D-2H-5W,56-58	10.25	24.6	0.082	3.7	3.39	0.8	2.98	0.8	1.70	0.6	1.96	0.8	0.19	1.7
172-1063D	172-1063D-2H-5W,74-76	10.41	24.8	0.094	4.3	3.24	0.8	2.65	0.8	1.78	0.5	1.97	0.8	0.20	3.0
172-1063D	172-1063D-2H-5W,90-92	10.58	25.0	0.074	3.7	3.55	0.6	2.84	0.6	1.65	12.8	1.86	10.5	0.19	1.7
172-1063D	172-1063D-2H-5W,107-109	10.75	25.2	0.075	3.9	3.19	0.8	3.05	0.8	1.60	0.8	1.75	0.8	0.16	1.7
172-1063D	172-1063D-2H-5W,124-126	10.91	25.4	0.078	6.7	3.31	0.6	2.81	1.5	1.52	0.7	1.66	0.7	0.18	5.9
172-1063D	172-1063D-2H-5W,140-142	11.08	25.6	0.077	4.5	3.04	0.8	2.88	0.8	1.58	0.8	1.74	0.8	0.16	2.7
172-1063D	172-1063D-2H-6W,6-8	11.25	25.8	0.077	3.9	3.46	0.8	2.82	0.8	1.49	0.5	1.70	0.8	0.18	1.8
172-1063D	172-1063D-2H-6W,24-26	11.41	25.9	0.089	3.9	3.25	0.8	2.65	0.8	1.64	0.8	1.87	0.8	0.19	1.8
172-1063D	172-1063D-2H-6W,40-42	11.58	26.1	0.070	4.1	3.39	1.1	2.87	1.5	1.58	0.8	1.83	0.8	0.17	1.4
172-1063D	172-1063D-2H-6W,56-58	11.75	26.3	0.088	4.0	3.15	0.8	2.62	0.8	1.70	0.8	1.83	0.8	0.18	1.8
172-1063D	172-1063D-2H-6W,74-76	11.91	26.4	0.080	4.0	3.49	0.8	2.78	0.8	1.71	0.8	1.81	0.8	0.19	1.7
172-1063D	172-1063D-2H-6W,109-111	12.25	26.7	0.081	6.6	4.32	0.8	2.59	0.8	1.95	0.8	1.96	0.8	0.24	6.8
172-1063D	172-1063D-2H-6W,124-126	12.41	26.9	0.068	3.9	4.31	0.7	2.59	0.6	1.69	0.8	1.73	0.8	0.21	1.7
172-1063D	172-1063D-2H-6W,140-142	12.58	27.1	0.060	7.0	3.65	0.8	2.73	2.1	1.63	0.8	1.72	0.6	0.16	5.9
172-1063D	172-1063D-2H-7W,6-8	12.74	27.4	0.071	4.8	3.30	0.6	2.74	0.6	1.54	0.8	1.67	0.9	0.16	3.1
172-1063D	172-1063D-2H-7W,21-23	12.89	27.6		3.9	3.17	0.8	2.84	0.8	1.42	0.8	1.56	0.8	0.00	0.0
172-1063D	172-1063D-2H-7W,35-37	13.05	27.8	0.063	4.7	3.97	0.6	2.65	0.6	1.54	1.1	1.65	1.3	0.18	3.1
172-1063D	172-1063D-2H-7W,54-56	13.21	28.1	0.064	5.2	3.03	0.6	2.80	0.6	1.55	0.8	1.67	0.7	0.14	3.1
172-1063D	172-1063D-3H-1W,140-142	13.52	28.5		22.0	3.69	15.0	2.56	15.0	1.98	24.2	2.06	14.6	0.00	0.0
172-1063D	172-1063D-3H-2W,9-11	13.69	28.7	0.064	4.8	4.23	0.6	2.59	0.6	1.60	0.7	1.70	0.7	0.20	3.2
172-1063D	172-1063D-3H-2W,24-26	13.85	28.9		4.1	4.02	0.8	2.80	0.8	1.52	0.8	1.61	0.7	0.00	0.0
172-1063D	172-1063D-3H-2W,40-42	14.02	29.0		4.2	2.98	0.8	2.58	0.8	1.47	0.8	1.55	0.7	0.00	0.0
172-1063D	172-1063D-3H-2W,56-58	14.19	29.4	0.062	6.3	2.48	0.6	2.66	0.9	1.50	0.5	1.64	0.5	0.11	3.5
172-1063D	172-1063D-3H-2W,74-76	14.35	29.8	0.073	4.9	4.88	0.6	2.46	1.2	1.23	0.5	1.72	0.5	0.25	3.4
172-1063D	172-1063D-3H-2W,90-92	14.52	30.3		17.1	4.93	15.0	2.62	15.0	0.00	0.0	0.00	0.0	0.00	0.0
172-1063D	172-1063D-3H-2W,105-107	14.67	30.6	0.073	5.0	4.76	0.6	2.57	1.8	1.36	0.5	1.78	0.5	0.24	3.4
172-1063D	172-1063D-3H-2W,121-123	14.85	31.1	0.068	4.9	5.09	0.6	2.28	1.0	1.62	0.5	1.67	0.5	0.24	3.3
172-1063D	172-1063D-3H-2W,140-142	15.02	31.6		4.4	5.21	0.8	2.42	0.8	1.56	0.8	1.61	0.7	0.00	0.0
172-1063D	172-1063D-3H-3W,6-8	15.19	32.2	0.064	5.0	5.06	0.6	2.38	1.2	1.56	0.5	1.62	0.5	0.23	3.3
172-1063D	172-1063D-3H-3W,40-42	15.52	33.5	0.059	5.3	4.14	0.4	2.09	4.0	1.40	0.5	1.44	0.5	0.17	3.3
172-1063D	172-1063D-3H-3W,70-72	15.82	34.9	0.072	5.2	4.35	0.4	2.28	1.8	1.48	0.5	1.56	0.5	0.21	3.5