Citation:

j.quascirev.2006.03.003

Name: U and Th concentrations and U-TH ages for bulk carbonate samples from ODP Hole 166-1008A (Table 1)
Published: 2006
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Thirty-one new bulk-sediment U–Th dates are presented, together with an improved d18O stratigraphy, for ODP Site 1008A on the slopes of the Bahamas Banks. These ages supplement and extend those from previous studies and provide constraints on the timing of sea-level highstands associated with marine isotope stages (MIS) 7 and 9. Ages are screened for reliability based on their initial U and Th isotope ratios, and on the aragonite fraction of the sediment. Twelve 'reliable' dates for MIS 7 suggest that its start is concordant with that predicted if climate is forced by northern-hemisphere summer insolation following the theory of Milankovitch. But U–Th and d18O data indicate the presence of an additional highstand which post-dates the expected end of MIS 7 by up to 10 ka. This event is also seen in coral reconstructions of sea-level. It suggests that sea-level is not responding in any simple way to northern-hemisphere summer insolation, and that tuned chronologies which make such an assumption are in error by ~10 ka at this time. U–Th dates for MIS 9 also suggest a potential mismatch between the actual timing of sea-level and that predicted by simple mid-latitude northern-hemisphere forcing. Four dates are earlier than that predicted for the start of MIS 9. Although the most extreme of these dates may not be reliable (based on the low-aragonite content of the sediment) the other three appear robust and suggest that full MIS 9 interglacial conditions were established at 343 ka. This is ~8 ka prior to the date expected if this warm period were driven by northern-hemisphere summer insolation.

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Latitude: 23.610700 * Longitude: -79.083500

Date/Time Start: 1996-04-08T20:05:00 * Date/Time End: 1996-04-09T10:20:00

Minimum DEPTH, sediment/rock: 12.30 m * Maximum DEPTH, sediment/rock: 29.13 m

Event(s):

166-1008A * Latitude: 23.610700 * Longitude: -79.083500 * Date/Time Start: 1996-04-08T20:05:00 * Date/Time End: 1996-04-09T10:20:00 * Elevation: -437.1 m * Penetration: 134.5 m * Recovery: 89.09 m * Location: South Atlantic Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 16 cores; 134.5 m cored; 0 m drilled; 66.2 % recovery

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, sediment/rock	Depth sed	m			Geocode
2	Sample code/label	Sample label		Henderson, Gideon M	DSDP/ODP/IODP sample designation
3	Uranium-238	238U	mg/kg	Henderson, Gideon M	Inductively coupled plasma - mass spectrometry (ICP-MS)
4	Uranium-238, standard deviation	238U std dev	±	Henderson, Gideon M	Inductively coupled plasma - mass spectrometry (ICP-MS)
5	Thorium-232	232Th	µg/kg	Henderson, Gideon M	Inductively coupled plasma - mass spectrometry (ICP-MS)
6	Thorium-232, standard deviation	232Th std dev	±	Henderson, Gideon M	Inductively coupled plasma - mass spectrometry (ICP-MS)
7	Thorium-230	230Th	ng/kg	Henderson, Gideon M	Inductively coupled plasma - mass spectrometry (ICP-MS)
8	Thorium-230, standard deviation	230Th std dev	±	Henderson, Gideon M	Inductively coupled plasma - mass spectrometry (ICP-MS)
9	δ234 Uranium (0)	δ234U (0)	‰	Henderson, Gideon M	Inductively coupled plasma - mass spectrometry (ICP-MS)	d234U(0)
10	δ234 Uranium (0), standard deviation	δ234U (0) std dev	±	Henderson, Gideon M	Inductively coupled plasma - mass spectrometry (ICP-MS)	d234U(0)
11	Thorium-230/Uranium-238 ratio	230Th/238U		Henderson, Gideon M	Calculated
12	Thorium-230/Uranium-238 activity ratio, standard deviation	(230Th/238U) std dev	±	Henderson, Gideon M	Calculated
13	Age, dated	Age dated	ka	Henderson, Gideon M	Age, Uranium-Thorium
14	Age, dated standard deviation	Age dated std dev	±	Henderson, Gideon M	Age, Uranium-Thorium
15	Age, dated	Age dated	ka	Henderson, Gideon M	Age, calibrated	corrected for initial 230Th assuming an initial 232Th/230Th atom ratio of 20,000
16	Age, dated standard deviation	Age dated std dev	±	Henderson, Gideon M	Age, calibrated
17	δ234 Uranium	δ234U	‰	Henderson, Gideon M		d234U(T)
18	δ234 Uranium, standard deviation	δ234U std dev	±	Henderson, Gideon M		d234U(T)

License:

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

Size:

527 data points

Data

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

1 Depth sed [m]	2 Sample label (DSDP/ODP/IODP sample designation)	3 238U [mg/kg] (Inductively coupled plasma - ...)	4 238U std dev [±] (Inductively coupled plasma - ...)	5 232Th [µg/kg] (Inductively coupled plasma - ...)	6 232Th std dev [±] (Inductively coupled plasma - ...)	7 230Th [ng/kg] (Inductively coupled plasma - ...)	8 230Th std dev [±] (Inductively coupled plasma - ...)	9 δ234U (0) [‰] (d234U(0), Inductively coupled...)	10 δ234U (0) std dev [±] (d234U(0), Inductively coupled...)	11 230Th/238U (Calculated)	12 (230Th/238U) std dev [±] (Calculated)	13 Age dated [ka] (Age, Uranium-Thorium)	14 Age dated std dev [±] (Age, Uranium-Thorium)	15 Age dated [ka] (corrected for initial 230Th a...)	16 Age dated std dev [±] (Age, calibrated)	17 δ234U [‰] (d234U(T))	18 δ234U std dev [±] (d234U(T))
12.30	166-1008A-2H-4,120	7.453	0.006	272.3	0.8	100.2	0.3	92	1	0.821	0.003	147	1	137	5	136	2
12.56	166-1008A-2H-4,146	4.981	0.004	280.3	0.8	70.1	0.2	100	1	0.860	0.003	159	1	144	7	151	3
12.75	166-1008A-2H-5,15	7.171	0.006	206.9	0.6	116.4	0.4	88	1	0.992	0.003	242	3	235	5	171	2
13.80	166-1008A-2H-5,120	8.192	0.007	77.1	0.2	122.2	0.4	80	1	0.912	0.003	193	2	190	2	138	2
18.84	166-1008A-3H-2,124	5.464	0.005	73.4	0.2	87.8	0.3	74	1	0.982	0.003	248	3	244	3	149	1
20.07	166-1008A-3H-3,97	3.499	0.003	222.9	0.7	59.3	0.2	63	2	1.035	0.003	337	8	320	8	163	1
20.98	166-1008A-3H-4,38	8.584	0.010	166.9	0.5	127.7	0.2	65	4	0.909	0.002	201	3	196	4	112	6
21.61	166-1008A-3H-4,101	14.316	0.017	181.9	0.5	195.0	0.3	88	4	0.832	0.002	152	1	149	2	134	6
22.30	166-1008A-3H-5,20	7.243	0.006	160.9	0.5	113.3	0.4	75	1	0.956	0.003	224	2	218	4	140	2
22.48	166-1008A-3H-5,38	7.042	0.006	142.3	0.4	120.8	0.4	68	1	1.048	0.003	352	9	346	9	183	1
22.63	166-1008A-3H-5,53	6.144	0.005	164.2	0.5	102.6	0.3	68	1	1.020	0.003	300	5	293	6	157	2
22.63	166-1008A-3H-5,54	6.254	0.008	158.2	0.2	106.5	0.1	70	1	1.041	0.001	330	4	325	5	175	3
23.27	166-1008A-3H-5,117	6.954	0.008	123.3	0.2	121.3	0.2	67	1	1.066	0.002	406	9	403	9	209	2
23.63	166-1008A-3H-6,3	7.174	0.009	111.3	0.2	124.5	0.1	64	1	1.060	0.001	402	8	400	8	197	4
23.98	166-1008A-3H-6,38	6.888	0.006	66.3	0.2	111.1	0.3	60	1	0.986	0.003	268	4	265	4	128	1
23.98	166-1008A-3H-6,38	7.632	0.009	69.9	0.1	127.5	0.1	57	1	1.021	0.001	324	4	322	4	142	3
24.24	166-1008A-3H-6,64	9.365	0.011	75.8	0.1	153.2	0.2	51	1	0.999	0.002	300	3	299	3	119	1
24.49	166-1008A-3H-6,89	8.544	0.007	172.0	0.5	133.3	0.4	54	1	0.953	0.003	242	3	236	5	105	1
24.49	166-1008A-3H-6,89	8.253	0.010	67.7	0.1	137.2	0.1	55	1	1.016	0.001	319	4	317	4	135	3
24.98	166-1008A-3H-6,138	7.382	0.009	75.1	0.1	124.4	0.2	66	1	1.029	0.002	319	4	318	4	161	2
25.48	166-1008A-3H-7,38	8.238	0.010	72.1	0.1	138.2	0.2	56	1	1.025	0.002	335	4	333	5	144	2
25.90	166-1008A-3H-7,80	7.531	0.006	73.2	0.2	126.0	0.4	51	1	1.022	0.003	343	8	340	8	135	2
25.90	166-1008A-3H-7,80	7.457	0.009	75.2	0.1	125.1	0.2	51	1	1.025	0.002	34	5	346	5	137	2
25.90	166-1008A-3H-7,80	7.261	0.009	76.9	0.1	122.0	0.1	53	1	1.026	0.001	345	5	344	5	140	3
26.13	166-1008A-4H-1,3	5.543	0.007	101.3	0.1	93.9	0.1	54	1	1.036	0.002	366	6	363	7	149	2
26.32	166-1008A-4H-1,22	5.230	0.006	106.0	0.1	89.0	0.1	59	1	1.040	0.002	360	6	355	6	160	2
26.48	166-1008A-4H-1,38	5.896	0.007	117.4	0.3	98.3	0.2	46	4	1.019	0.002	350	12	346	12	122	10
27.15	166-1008A-4H-1,105	4.121	0.005	447.3	1.3	71.4	0.1	58	4	1.059	0.002	428	23	403	27	181	12
27.76	166-1008A-4H-2,16	4.480	0.005	388.7	1.1	73.0	0.1	49	4	0.995	0.002	298	7	276	4	106	8
28.49	166-1008A-4H-2,89	8.114	0.007	121.9	0.4	130.6	0.4	69	1	0.983	0.003	254	3	249	4	141	2
29.13	166-1008A-4H-3,3	7.994	0.010	144.6	0.4	128.6	0.2	61	4	0.983	0.002	263	5	259	6	128	8