Citation:

PANGAEA.993440 (DOI registration in progress)

Name: Nannofossil absolute abundances of sediment core GeoB2204-2
Published: 2026-04-07
License: https://creativecommons.org/licenses/by/4.0/
Keywords: coccolith abundances; equatorial western Atlantic; off Brazil

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Published: 2026-04-07

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Abstract:

The calcareous nannofossil assemblages from sediment core GeoB2204-2 from the western equatorial region off Brazil were examined to document oceanographic changes in surface waters during the last 155 ka. Coccolith counts (N) were made manually using a Zeiss DSM 940A scanning electron microscope at 3,000x or 5,000x magnification. The recorded fluctuations in the abundance and composition of coccolithophore communities reflect changes in surface water masses. The community is dominated by species from the deeper photic zone, such as Florisphaera profunda and Gladiolithus flabellatus, indicating predominantly oligotrophic conditions during glacial periods. During interglacial periods, higher abundances and larger proportions of species with an affinity for nutrient-rich surface waters indicate the highest abundances.

Keyword(s):

coccolith abundances; equatorial western Atlantic; off Brazil

Related to:

Heidersdorf, Felix (2000): Palökologische Untersuchungen der Coccolithophoridengemeinschaften im Kern GeoB 2204-2 (äquatorialer Westatlantik) für den Zeitraum der letzten 155 ka [thesis]. Unpubl. Diplomarbeit (Master Thesis), University of Bremen, 57 pp

Coverage:

Latitude: -8.528333 * Longitude: -34.021667

Date/Time Start: 1993-03-22T00:00:00 * Date/Time End: 1993-03-22T00:00:00

Minimum DEPTH, sediment/rock: 0.145 m * Maximum DEPTH, sediment/rock: 3.645 m

Event(s):

GeoB2204-2 * Latitude: -8.528333 * Longitude: -34.021667 * Date/Time: 1993-03-22T00:00:00 * Elevation: -2072.0 m * Recovery: 8.97 m * Location: Brazil Basin * Campaign: * Basis: * Method/Device: Gravity corer (Kiel type) (SL) * Comment: weight on top of sediment

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, sediment/rock	Depth sed	m	Baumann, Karl-Heinz		Geocode
2	Depth, corrected	Depth corr	m	Baumann, Karl-Heinz
3	AGE	Age	ka BP	Baumann, Karl-Heinz		Geocode
4	Coccoliths, total	Cocco	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
5	Acanthoica spp.	Acanthoica spp.	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
6	Calciosolenia brasiliensis	C. brasiliensis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
7	Calciosolenia murrayi	C. murrayi	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
8	Calcidiscus leptoporus	C. leptoporus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
9	Calcidiscus quadriperforatus	C. quadriperforatus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
10	Ceratolithus cristatus	C. cristatus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
11	Discosphaera tubifera	D. tubifera	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
12	Emiliania huxleyi	E. huxleyi	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
13	Florisphaera profunda	F. profunda	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
14	Gephyrocapsa ericsonii	G. ericsonii	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
15	Gephyrocapsa muellerae	G. muellerae	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
16	Gephyrocapsa oceanica	G. oceanica	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
17	Gephyrocapsa ornata	G. ornata	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
18	Gladiolithus flabellatus	G. flabellatus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
19	Hayaster perplexus	H. perplexus	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
20	Helicosphaera carteri	H. carteri	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
21	Oolithotus fragilis	O. fragilis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
22	Pontosphaera spp.	Pontosphaera spp.	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
23	Reticulofenestra sessilis	R. sessilis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
24	Rhabdosphaera clavigera	R. clavigera	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
25	Rhabdosphaera stylifera	R. stylifera	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
26	Syracosphaera pulchra	S. pulchra	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
27	Syracosphaera spp.	Syracosphaera spp.	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
28	Umbilicosphaera hulburtiana	U. hulburtiana	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
29	Umbilicosphaera sibogae	U. sibogae	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
30	Umbellosphaera irregularis	U. irregularis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
31	Umbellosphaera tenuis	U. tenuis	10⁶ #/g	Baumann, Karl-Heinz	Scanning electron microscope (SEM), Zeiss, DSM 940A
32	Coccoliths, other	Cocco oth	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:

2130 data points

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