Distribution of planktic foraminifera in surface sediments and sedimentation rates of sediment cores from the Ibero-Moroccan continental rise and slope, supplement to: Thiede, Jörn (1973): Sedimentation rates of planktonic and benthic foraminifera in sediments from the Atlantic continental margin of Portugal and Morocco. Meteor Forschungsergebnisse, Deutsche Forschungsgemeinschaft, Reihe C Geologie und Geophysik, Gebrüder Bornträger, Berlin, Stuttgart, C16, 1-18


Cores from the Atlantic Ibero-Moroccan continental rise and slope contain fine-grained Late Pleistocene and Holocene sediments. These young sediments cover the continental margin in large lensformed litho- and biostratigraphically well-defined units. The total sedimentation rates range from 4 cm/ 1000 yrs. to 27 cm/1000 yrs. off Portugal and from 6 cm/1000 yrs. to 14 cm/1000 yrs. off Morocco. Only a small proportion of these sediments usually consists of sand-sized particles (>0.063 mm) which are mostly dominated by foraminifera. Both planktonic and benthic foraminifera are much more abundant in Late Pleistocene and Holocene samples from the upper slope in comparison to those from the deeper slope and from the abyssal plains. Total sedimentation rates during cool and warm climatic stages are rather similar for both groups of foraminifera. For example, in Late Holocene sediments 7 x 103 benthic and 201 x 103 planktonic foraminifera (fraction 0.63 -0.20 mm) per 100 cm2 and 1000 yrs. are preserved in the Tagus, 10-19 X 103 benthic and about 1.3 X 10**6 planktonic foraminifera are preserved in the Seine abyssal plain sediments. Values from the upper slope sediments are higher for benthic foraminifera by a factor of 60 off Portugal and 60 to 70 off Morocco. The values for planktonic ones differ by factors of 6-12 and 6 respectively. These numbers seem to reflect differences in production and preservation. Production rates of planktonic foraminifera generally seem to be somewhat higher during Holocene than during Late Pleistocene, and the rates of benthic foraminifera appear rather higher during Late Pleistocene than during Holocene.

DOI https://doi.org/10.1594/PANGAEA.548417
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.548417
Creator Thiede, Jörn
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 1973
Rights Creative Commons Attribution 3.0 Unported
OpenAccess true
Language English
Resource Type Supplementary Collection of Datasets
Format application/zip
Size 10 datasets
Discipline Earth System Research
Spatial Coverage (-10.853W, 33.433S, -9.133E, 37.917N); Atlantic Ocean; North Atlantic; North Atlantic Ocean; Cape Blanc/Meteor Bank/Portugal
Temporal Coverage Begin 1967-01-17T14:00:00Z
Temporal Coverage End 1970-07-17T00:00:00Z