Citation:

1999PA900019

Name: (Table 1) Radiocarbon ages of foraminifera from a Piston and a Trigger Weight from Ceara Rise
Published: 1999
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Radiocarbon-age measurements on single species of foraminifera from a core on the Ceara Rise demonstrate the importance of the joint effect of bioturbation and variable rain abundance of foraminifera. The relatively high mixed layer ages for Pulleniatina obliquiloculata reflect, at least in part, an early Holocene peak in its abundance while the relatively young ages for Globorotalia menardii reflect the delay until mid Holocene of its reappearance in the Atlantic Ocean. These results clearly demonstrate that core-top sediment samples need not be representative foraminifera falling from today's surface ocean. Rather, at least on the Ceara Rise, such samples consist of a composite of changing species groupings. These results also reconfirm the pitfalls associated with attempts to reconstruct the radiocarbon age of deep ocean water on the basis of benthic-planktonic foraminiferal age differences.

Coverage:

Latitude: 4.000000 * Longitude: -43.000000

Minimum DEPTH, sediment/rock: 0.01 m * Maximum DEPTH, sediment/rock: 1.17 m

Event(s):

Ceara_Rise * Latitude: 4.000000 * Longitude: -43.000000 * Location: Ceara Rise

Comment:

The 14C ages on planktonic foraminifcra have been reservoir-corrected by subtracting 400 years (Bard, 1988) from the measured age, and those on benthic foraminifera have been corrected by subtracting 800 years. The reservoir-age of 800 years for the deep water at the core site is based on the 70/30 mixture of northern and southern source waters, as deduced from the silicate content at Geochemical Ocean Sections Study (GEOSECS) station 40, with initial I4C ages of 550 and 1400 years, respectively. In addition to the ages listed, three others were obtained for the piston core sample from 3 cm depth: Globorotalia tumida, 4350 years; <63 µm CaCO3, 3115 years; and 63-150 µm CaCO3, 3635 years.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, sediment/rock	Depth sed	m	Broecker, Wallace S		Geocode
2	Core	Core		Broecker, Wallace S
3	Age, dated	Age dated	ka	Broecker, Wallace S	Age, 14C milieu/reservoir corrected (-400 yr)	Neogloboquadrina dutertrei
4	Neogloboquadrina dutertrei	N. dutertrei	#/g	Broecker, Wallace S
5	Age, dated	Age dated	ka	Broecker, Wallace S	Age, 14C milieu/reservoir corrected (-400 yr)	Globorotalia menardii
6	Globorotalia menardii	G. menardii	#/g	Broecker, Wallace S
7	Age, dated	Age dated	ka	Broecker, Wallace S	Age, 14C milieu/reservoir corrected (-400 yr)	Globigerinoides sacculifer
8	Globigerinoides sacculifer	G. sacculifer	#/g	Broecker, Wallace S
9	Age, dated	Age dated	ka	Broecker, Wallace S	Age, 14C milieu/reservoir corrected (-400 yr)	Pulleniatina obliquiloculata
10	Pulleniatina obliquiloculata	P. obliquiloculata	#/g	Broecker, Wallace S
11	Age, dated	Age dated	ka	Broecker, Wallace S	Age, 14C milieu/reservoir corrected (-800 yr)	mixed benthic foraminifera
12	Foraminifera, benthic	Foram benth	#/g	Broecker, Wallace S

License:

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

Size:

128 data points

Data

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

1 Depth sed [m]	2 Core	3 Age dated [ka] (Neogloboquadrina dutertrei, A...)	4 N. dutertrei [#/g]	5 Age dated [ka] (Globorotalia menardii, Age, 1...)	6 G. menardii [#/g]	7 Age dated [ka] (Globigerinoides sacculifer, A...)	8 G. sacculifer [#/g]	9 Age dated [ka] (Pulleniatina obliquiloculata,...)	10 P. obliquiloculata [#/g]	11 Age dated [ka] (mixed benthic foraminifera, A...)	12 Foram benth [#/g]
0.01	Trigger			1.860	189	4.045		4.680
0.03	Piston	2.960	74	1.785		3.515	4100	5.795	66	3.685	98
0.04	Trigger			2.565	173	4.190		5.506
0.07	Piston	3.353	104			4.355	3200	6.225	65	4.010	177
0.07	Trigger			3.785	169	5.440		6.325
0.10	Piston	5.245	66			5.415	1900	6.475	69	4930.000	54
0.10	Trigger			4.455	86	7.300		8.050
0.13	Piston	6.430	69			5.845	3200	7.685	77	6.045	54
0.13	Trigger			5.350	23	8.105		9.230
0.17	Piston	8.365	115			8.215	2200	9.045	145	6.865	46
0.20	Piston	10.150	101			9.150	1500	10.000	92	9.640	33
0.23	Piston	11.040	100			10.120	1400	10.720	78	10.460	29
0.27	Piston	12.400	99			10.490	900	10.660	46
0.20	Piston	12.350	92			11.060	1200		19
0.33	Piston	12.840	134			11.070	900	11.070	21
0.37	Piston	13.610	82			12.110	500
0.40	Piston	12.300	44			8.300	600
1.13	Piston	28.740	121				700
1.17	Piston	27.970	290			28.110	800