Citation:

2010PA002055

Name: (Table S1) Globigerinoides sacculifer Boron isotope ratios of ODP Hole 165-999A
Published: 2011
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

everal hypotheses have been put forward to explain the onset of intensive glaciations on Greenland, Scandinavia, and North America during the Pliocene epoch between 3.6 and 2.7 million years ago (Ma). A decrease in atmospheric CO2 may have played a role during the onset of glaciations, but other tectonic and oceanic events occurring at the same time may have played a part as well. Here we present detailed atmospheric CO2 estimates from boron isotopes in planktic foraminifer shells spanning 4.6-2.0 Ma. Maximal Pliocene atmospheric CO2 estimates gradually declined from values around 410 µatm to early Pleistocene values of 300 matm at 2.0 Ma. After the onset of large-scale ice sheets in the Northern Hemisphere, maximal pCO2 estimates were still at 2.5 Ma +90 µatm higher than values characteristic of the early Pleistocene interglacials. By contrast, Pliocene minimal atmospheric CO2 gradually decreased from 310 to 245 µatm at 3.2 Ma, coinciding with the start of transient glaciations on Greenland. Values characteristic of early Pleistocene glacial atmospheric CO2 of 200 matm were abruptly reached after 2.7 Ma during the late Pliocene transition. This trend is consistent with the suggestion that ocean stratification and iron fertilization increased after 2.7 Ma in the North Pacific and Southern Ocean and may have led to increased glacial CO2 storage in the oceanic abyss after 2.7 Ma onward.

Other version:

Boron isotope ratios of ODP Hole 165-999A, supplement

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Latitude: 12.744000 * Longitude: -78.739300

Date/Time Start: 1996-01-10T19:30:00 * Date/Time End: 1996-01-14T23:15:00

Minimum DEPTH, sediment/rock: 64.74 m * Maximum DEPTH, sediment/rock: 140.78 m

Event(s):

165-999A * Latitude: 12.744000 * Longitude: -78.739300 * Date/Time Start: 1996-01-10T19:30:00 * Date/Time End: 1996-01-14T23:15:00 * Elevation: -2828.0 m * Penetration: 566.1 m * Recovery: 534.83 m * Location: Caribbean Sea * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 61 core; 566.1 m cored; 0 m drilled; 94.5 % recovery

Comment:

DEPTH, sediment/rock is given in mbsf.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Sample code/label	Sample label		Bartoli, Gretta	DSDP/ODP/IODP sample designation
2	DEPTH, sediment/rock	Depth sed	m			Geocode
3	AGE	Age	ka BP			Geocode
4	Size fraction	Size fraction		Bartoli, Gretta		in µm
5	Isotopic event	Isotopic event		Bartoli, Gretta
6	Method comment	Method comm		Bartoli, Gretta
7	Globigerinoides sacculifer, weight	G. sacculifer W	µg	Bartoli, Gretta
8	Globigerinoides sacculifer, δ11B	G. sacculifer δ11B	‰ SRM	Bartoli, Gretta		run 1
9	Globigerinoides sacculifer, δ11B	G. sacculifer δ11B	‰ SRM	Bartoli, Gretta		run 2
10	Globigerinoides sacculifer, δ11B	G. sacculifer δ11B	‰ SRM	Bartoli, Gretta		run 3
11	Globigerinoides sacculifer, δ11B	G. sacculifer δ11B	‰ SRM	Bartoli, Gretta		run 4
12	Globigerinoides sacculifer, δ11B	G. sacculifer δ11B	‰ SRM	Bartoli, Gretta		run 5
13	Globigerinoides sacculifer, δ11B	G. sacculifer δ11B	‰ SRM	Bartoli, Gretta		run 6
14	Globigerinoides sacculifer, δ11B	G. sacculifer δ11B	‰ SRM	Bartoli, Gretta		outliers
15	Globigerinoides sacculifer, δ11B	G. sacculifer δ11B	‰ SRM	Bartoli, Gretta		averaged d11B w/out outliers
16	Globigerinoides sacculifer, δ11B, standard error	G. sacculifer δ11B std e	±	Bartoli, Gretta		internal uncertainty (2se)
17	Globigerinoides sacculifer, δ11B, standard error	G. sacculifer δ11B std e	±	Bartoli, Gretta		external reproducibility (2se) of vaterite for same number of runs
18	Globigerinoides sacculifer, δ11B, standard error	G. sacculifer δ11B std e	±	Bartoli, Gretta		plotted error-bars

License:

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

Size:

659 data points

Data

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

1 Sample label	2 Depth sed [m]	3 Age [ka BP]	4 Size fraction (in µm)	5 Isotopic event	6 Method comm	7 G. sacculifer W [µg]	8 G. sacculifer δ11B [‰ SRM] (run 1)	9 G. sacculifer δ11B [‰ SRM] (run 2)	10 G. sacculifer δ11B [‰ SRM] (run 3)	11 G. sacculifer δ11B [‰ SRM] (run 4)	12 G. sacculifer δ11B [‰ SRM] (run 5)	13 G. sacculifer δ11B [‰ SRM] (run 6)	14 G. sacculifer δ11B [‰ SRM] (outliers)	15 G. sacculifer δ11B [‰ SRM] (averaged d11B w/out outliers)	16 G. sacculifer δ11B std e [±] (internal uncertainty (2se))	17 G. sacculifer δ11B std e [±] (external reproducibility (2se...)	18 G. sacculifer δ11B std e [±] (plotted error-bars)
165-999A-7H-7,64-66	64.74	1975.13	400-500	75	freeze-dry	38.80	21.45	21.89	21.55	21.59	21.62			21.62	0.23	0.30	0.30
165-999A-8H-2,47-49	66.57	2026.54	400-500	77	freeze-dry	35.70	21.23	21.46	20.96	21.30	21.02			21.20	0.26	0.30	0.30
165-999A-8H-3,103-105	68.63	2078.09	400-500	78	freeze-dry	43.70	21.38	21.41	21.80	21.46				21.52	0.27	0.33	0.33
165-999A-8H-5,71-73	71.31	2161.01	400-500	82/83	freeze-dry	50.30	21.78	21.54	21.76	21.70				21.70	0.21	0.33	0.33
165-999A-8H-5,87-89	71.47	2166.04	400-500	83	freeze-dry	48.00	20.58	20.00	20.60	20.50	20.58			20.45	0.29	0.30	0.30
165-999A-8H-6,47-49	72.57	2201.34	400-500	84	freeze-dry	43.30	22.30	22.10	21.95	22.63	22.20			22.24	0.29	0.30	0.30
165-999A-8H-6,47-49	72.57	2201.34	400-500	84	freeze-dry	44.50	21.07	20.52	20.89	20.65	21.05			20.84	0.28	0.30	0.30
165-999A-8H-6,49-51	72.59	2201.94	400-500	84	freeze-dry	42.20	20.64	19.96	20.46	20.31	20.29	20.65		20.38	0.28	0.27	0.28
165-999A-9H-1,127-129	75.37	2304.67	400-500	89	freeze-dry	43.50	21.65	21.60	21.35	21.59				21.55	0.22	0.33	0.33
165-999A-9H-6,64-66	82.24	2502.94	400-500	99	freeze-dry	53.00	20.65	20.44	20.89	20.50	20.47			20.59	0.25	0.30	0.30
165-999A-9H-7,67-69	83.77	2558.58	400-500	101	freeze-dry		20.68	21.15	21.31					21.05	0.42	0.38	0.42
165-999A-10H-1,127-129	84.87	2600.86	400-500	104	freeze-dry	46.90	21.53	21.68	21.41	21.84	21.42			21.58	0.24	0.30	0.30
165-999A-10H-3,98-100	87.58	2685.47	400-500	G4	3% H2O2	35.20	21.49	21.61	21.57					21.55	0.19	0.39	0.39
165-999A-10H-4,20-22	88.30	2702.23	400-500	G5	freeze-dry	34.20	20.59	20.49	20.67	20.45				20.55	0.21	0.33	0.33
165-999A-10H-4,35-37	88.45	2705.51	400-500	G5	freeze-dry	48.00	20.87	20.94	20.58	20.52	20.64			20.71	0.24	0.30	0.30
165-999A-10H-4,47-49	88.57	2708.11	400-500	G6	freeze-dry	29.90	21.40	21.22	21.16	21.28				21.26	0.21	0.33	0.33
165-999A-10H-4,57-59	88.67	2710.46	400-500	G6	freeze-dry	33.00	20.84	20.92	19.35	21.04				20.54	0.82	0.33	0.82
165-999A-10H-5,4-6	89.64	2751.56	400-500	G8	freeze-dry	35.60	20.91	21.02	20.71	21.18	20.88			20.94	0.24	0.30	0.30
165-999A-10H-5,50-52	90.10	2772.86	400-500	G9	freeze-dry	36.10	20.78	20.39	20.04	20.47	20.46			20.43	0.30	0.30	0.30
165-999A-10H-5,77-79	90.37	2778.72	400-500	G9	3% H2O2	37.10	20.26	20.33	20.28	20.16	20.27			20.26	0.19	0.33	0.33
165-999A-10H-5,92-94	90.52	2781.41	400-500	G9	3% H2O2	36.70	20.78	20.90	20.97	20.40	20.72			20.75	0.27	0.30	0.30
165-999A-10H-6,20-22	91.30	2795.49	400-500	G9	freeze-dry	36.80	21.04	20.85	20.56	21.00			6.16	20.86	0.28	0.33	0.33
165-999A-11H-1,117-119	94.27	2918.77	400-500	G16	3% H2O2	35.70	21.21	20.75	21.45	21.38				21.20	0.36	0.33	0.36
165-999A-11H-3,77-79	96.87	3000.57	400-500	G19	3% H2O2	31.70	20.21	20.46	20.33	20.23	20.58			20.36	0.23	0.30	0.30
165-999A-11H-5,57-59	99.67	3073.92	400-500	K1	3% H2O2	48.10	20.46	21.08	21.23	21.17	21.01			20.99	0.33	0.30	0.33
165-999A-11H-5,80-82	99.90	3081.38	400-500	K1	freeze-dry	29.10	20.46	20.25	20.08	20.15			16.22	20.24	0.25	0.33	0.33
165-999A-11H-6,5-6	100.65	3104.91	400-500	K2	freeze-dry	40.20	20.90	21.08	21.19	21.16	21.09	20.82		21.04	0.22	0.27	0.27
165-999A-11H-7,17-19	102.27	3155.92	400-500	KM3	3% H2O2	44.50	21.47	20.61	21.53	21.30	21.93			21.37	0.47	0.30	0.47
165-999A-12H-1,50-52	103.10	3218.57	400-500	KM6	3% H2O2	45.80	21.32	21.15	21.37					21.28	0.22	0.39	0.39
165-999A-12H-1,90-92	103.50	3239.17	400-500	M1	freeze-dry	39.70	20.65	20.54	20.97	20.99	20.37	20.42		20.66	0.28	0.27	0.28
165-999A-12H-2,20-22	104.30	3259.15	400-500	M1/M2	3% H2O2	32.40	21.19	21.15	21.35					21.23	0.22	0.39	0.39
165-999A-12H-3,90-92	106.50	3321.60	400-500	MG1	3% H2O2	52.50	21.04	20.85	20.89	20.91				20.92	0.20	0.33	0.33
165-999A-12H-5,12-14	108.72	3403.24	400-500	MG5	3% H2O2	41.10	21.21	21.21	21.36	20.93	20.80			21.10	0.27	0.30	0.30
165-999A-12H-5,20-22	108.80	3406.73	400-500	MG5	freeze-dry	42.70	21.25	20.94	20.94					21.04	0.27	0.39	0.39
165-999A-12H-6,57-59	110.67	3471.47	400-500	MG6/MG7	3% H2O2	48.90	20.82	21.04	20.71	20.73				20.83	0.24	0.33	0.33
165-999A-13H-1,77-79	112.87	3542.53	400-500	MG9	3% H2O2	29.30	20.72	20.69	20.75					20.72	0.18	0.39	0.39
165-999A-13H-2,57-59	114.17	3590.77	400-500	MG12/Gi1	3% H2O2	26.10	20.81	21.00	20.71	20.86				20.84	0.22	0.33	0.33
165-999A-13H-4,117-119	117.77	3716.06	400-500	Gi6	3% H2O2	46.50	21.04	20.61	20.60	20.68				20.73	0.27	0.33	0.33
165-999A-13H-6,48-50	120.08	3792.18	400-500	Gi10	3% H2O2	45.70	21.07	21.12	21.08					21.09	0.18	0.39	0.39
165-999A-14H-1,48-50	122.08	3870.13	400-500	Gi15	3% H2O2	53.00	20.32	20.22	19.96	20.18				20.17	0.23	0.33	0.33
165-999A-14H-3,7-9	124.67	3961.07	400-500	Gi18	3% H2O2	50.40	20.60	20.82	20.80	20.77				20.75	0.21	0.33	0.33
165-999A-14H-4,98-100	127.08	4036.18	400-500	Gi22	3% H2O2	40.80	20.80	20.37	20.46	20.56				20.55	0.26	0.33	0.33
165-999A-14H-6,38-40	129.51	4117.13	400-500	Gi25	3% H2O2	39.80	20.86	20.15	19.84	20.14	20.57			20.31	0.40	0.30	0.40
165-999A-14H-7,64-66	131.27	4187.49	400-500	Gi27	freeze-dry	34.90	21.23	20.88	21.11	21.03	20.95			21.04	0.22	0.30	0.30
165-999A-14H-7,64-66	131.27	4187.49	400-500	Gi27	freeze-dry	36.40	19.38	18.91	19.56	18.56	18.95	19.09		19.08	0.34	0.27	0.29
165-999A-16H-1,18-20	140.78	4580.30	400-500	N7	3% H2O2	50.10	20.14	20.10	20.22	19.98			17.55	20.11	0.21	0.33	0.33
165-999A-10H-5,92-94	90.52	2781.41	250-355	G9	3% H2O2	24.70	20.77	20.96	20.76	20.71	20.80			20.80	0.20	0.30	0.30
165-999A-14H-1,48-50	122.08	3870.13	250-355	Gi15	3% H2O2	11.97	20.79	19.66	20.62	20.19	20.24			20.30	0.43	0.30	0.43
165-999A-16H-1,18-20	140.78	4580.30	250-355	N7	3% H2O2	13.86	20.29	20.24	20.13					20.22	0.20	0.39	0.39