Citation:

PANGAEA.965722

Name: Coccolith species abundances in sediment core GeoB3104-1 off NE Brazil for the past 46 ka
Creator: Karl-Heinz Baumann
Published: 2024-04-15
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Assemblages; coccolith abundances; Coccolithophores; tropical Atlantic

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Published: 2024-04-15 • DOI registered: 2024-04-16

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Abstract:

Coccolithophore assemblage data from sediment core GeoB3104-1 off the coast of NE Brazil spanning the past 46 ka. The assemblage data were used to assess changes in biodiversity and assemblage composition during the past 24 ka, i.e., from the Last Glacial Maximum to the current warm period covering the last deglaciation.

Samples were analysed at 2-20 cm intervals and were prepared using a combined dilution/filtering technique as described by Andruleit (1996, doi:10.2307/1485964). Between 50 and 115 mg of dry bulk sediment was brought into suspension using demineralized water buffered with ammonia (pH ~ 8.5-9). The suspension was ultrasonicated for 15 to 30 s, split (split factor = 100) using a rotary splitter and filtered onto polycarbonate membrane filters (0.4 µm pore size) using a vacuum pump. Samples were dried at 40°C for 24 h before ~1x1 cm filter aliquots were mounted on an aluminium stub that was prepared with electroconductive, self-adhesive, carbon-based discs (PLANO Leit tabs). The mounted samples were sputtered with gold/palladium in a Polaron SC7640 Sputter Coater.

Coccolith counts (N) were made manually using a Zeiss DSM 940A scanning electron microscope at 3,000x magnification. Some samples were counted on SEM images at 2,500x magnification. Where possible, a minimum of 300 coccoliths were counted. In some samples fewer coccoliths were counted due to low abundances. Sample mass (m), magnification, split factor (k) and the area of the scanned transect (A) and the filter (F) are given for all samples to allow calculation of the concentration of coccoliths per gram of dry bulk sediment, which was calculated using: (F*N)/(k*A*m).

Coccolithophore taxonomy follows Young et al. (2003, doi:10.58998/jnr2297). Species not reported in the data are assumed to be absent (that is, zero abundance). Two subspecies of Calcidiscus leptoporus were distinguished: Calcidiscus leptoporus subsp. quadriperforatus and Calcidiscus leptoporus subsp. leptoporus. The ladder was further subdivided into small (< 5 µm) and larger (>= 5 µm) specimens. The variety Rhabdosphaera clavigera var. stylifera was distinguished from Rhabdosphaera clavigera. Counts of unidentified and reworked specimens are given.

The chronology of the time series presented here is the revised age model included in the PALMOD 130k marine palaeoclimate data synthesis V1.1 (Jonkers et al., 2020, doi:10.5194/essd-12-1053-2020). It is based on radiocarbon ages measured on the planktonic foraminifera G. sacculifer (size range: 250-500 µm) and benthic foraminifera δ18O isotope data calibrated to a regional benthic foraminifera δ18O stack (Lisiecki and Stern, 2016, doi:10.1002/2016pa003002).

Keyword(s):

Assemblages; coccolith abundances; Coccolithophores; tropical Atlantic

Coverage:

Latitude: -3.666667 * Longitude: -37.716667

Date/Time Start: 1995-03-14T00:00:00 * Date/Time End: 1995-03-14T00:00:00

Minimum DEPTH, sediment/rock: 0.01 m * Maximum DEPTH, sediment/rock: 5.13 m

Event(s):

GeoB3104-1 * Latitude: -3.666667 * Longitude: -37.716667 * Date/Time: 1995-03-14T00:00:00 * Elevation: -767.0 m * Recovery: 5.25 m * Location: NE-Brazilian continental margin * Campaign: * Basis: * Method/Device: Gravity corer (Kiel type) (SL)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, sediment/rock	Depth sed	m	Baumann, Karl-Heinz		Geocode – Mid depth
2	AGE	Age	ka BP	Baumann, Karl-Heinz		Geocode
3	Acanthoica quattrospina	A. quattrospina	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
4	Algirosphaera robusta	A. robusta	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
5	Calcidiscus leptoporus ssp. leptoporus	C. leptoporus ssp. leptoporus	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A	< 5 µm
6	Calcidiscus leptoporus ssp. leptoporus	C. leptoporus ssp. leptoporus	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A	>= 5 µm
7	Calcidiscus leptoporus ssp. quadriperforatus	C. leptoporus ssp. quadriperforatus	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
8	Calciosolenia brasiliensis	C. brasiliensis	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
9	Calciosolenia murrayi	C. murrayi	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
10	Coccolithus pelagicus	C. pelagicus	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
11	Coronosphaera mediterranea	C. mediterranea	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
12	Discosphaera tubifera	D. tubifera	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
13	Emiliania huxleyi	E. huxleyi	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
14	Florisphaera profunda	F. profunda	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
15	Gladiolithus flabellatus	G. flabellatus	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
16	Gephyrocapsa ericsonii	G. ericsonii	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
17	Gephyrocapsa muellerae	G. muellerae	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
18	Gephyrocapsa oceanica	G. oceanica	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
19	Hayaster perplexus	H. perplexus	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
20	Helicosphaera carteri	H. carteri	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
21	Helicosphaera spp.	Helicosphaera spp.	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
22	Michaelsarsia spp.	Michaelsarsia spp.	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
23	Oolithotus antillarum	O. antillarum	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
24	Oolithotus fragilis	O. fragilis	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
25	Reticulofenestra sessilis	R. sessilis	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
26	Rhabdosphaera clavigera	R. clavigera	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
27	Rhabdosphaera clavigera var. stylifera	R. clavigera var. stylifera	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
28	Syracosphaera pulchra	S. pulchra	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
29	Syracosphaera sp.	Syracosphaera sp.	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
30	Umbilicosphaera foliosa	U. foliosa	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
31	Umbilicosphaera hulburtiana	U. hulburtiana	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
32	Umbilicosphaera sibogae	U. sibogae	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
33	Umbellosphaera tenuis	U. tenuis	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
34	Umbellosphaera irregularis	U. irregularis	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
35	Coccoliths indeterminata	Coccoliths indet	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
36	Coccoliths, reworked	Cocco rew	#	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
37	Sample mass	Samp m	mg	Baumann, Karl-Heinz
38	Sample mass	Samp m	g	Baumann, Karl-Heinz
39	Split factor	Split F		Baumann, Karl-Heinz
40	Magnification	Mag		Baumann, Karl-Heinz
41	Frame width	Frame w	mm	Baumann, Karl-Heinz
42	Transect length	Transect l	mm	Baumann, Karl-Heinz
43	Scanned area	Scanned area	mm²	Baumann, Karl-Heinz
44	Filter, area	Filter area	mm²	Baumann, Karl-Heinz
45	Acanthoica quattrospina	A. quattrospina	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
46	Algirosphaera robusta	A. robusta	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
47	Calcidiscus leptoporus ssp. leptoporus	C. leptoporus ssp. leptoporus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A	< 5 µm
48	Calcidiscus leptoporus ssp. leptoporus	C. leptoporus ssp. leptoporus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A	>= 5 µm
49	Calcidiscus leptoporus ssp. quadriperforatus	C. leptoporus ssp. quadriperforatus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
50	Calciosolenia brasiliensis	C. brasiliensis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
51	Calciosolenia murrayi	C. murrayi	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
52	Coccolithus pelagicus	C. pelagicus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
53	Coronosphaera mediterranea	C. mediterranea	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
54	Discosphaera tubifera	D. tubifera	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
55	Emiliania huxleyi	E. huxleyi	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
56	Florisphaera profunda	F. profunda	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
57	Gladiolithus flabellatus	G. flabellatus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
58	Gephyrocapsa ericsonii	G. ericsonii	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
59	Gephyrocapsa muellerae	G. muellerae	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
60	Gephyrocapsa oceanica	G. oceanica	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
61	Hayaster perplexus	H. perplexus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
62	Helicosphaera carteri	H. carteri	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
63	Helicosphaera spp.	Helicosphaera spp.	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
64	Michaelsarsia spp.	Michaelsarsia spp.	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
65	Oolithotus antillarum	O. antillarum	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
66	Oolithotus fragilis	O. fragilis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
67	Reticulofenestra sessilis	R. sessilis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
68	Rhabdosphaera clavigera	R. clavigera	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
69	Rhabdosphaera clavigera var. stylifera	R. clavigera var. stylifera	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
70	Syracosphaera pulchra	S. pulchra	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
71	Syracosphaera sp.	Syracosphaera sp.	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
72	Umbilicosphaera foliosa	U. foliosa	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
73	Umbilicosphaera hulburtiana	U. hulburtiana	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
74	Umbilicosphaera sibogae	U. sibogae	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
75	Umbellosphaera tenuis	U. tenuis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
76	Umbellosphaera irregularis	U. irregularis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
77	Coccoliths indeterminata, per unit sediment mass	Cocco indet/sed	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
78	Coccoliths, reworked, per unit sediment mass	Cocco rew/sed	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

4332 data points

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