Magnetostratigraphy of DSDP Leg 73 in the South Atlantic

DOI

The main objective of DSDP Leg 73 was to obtain high-quality records of major paleooceanographic events in the South Atlantic. This was achieved by coring six sites on the African plate. The sediments thus recovered span the Cenozoic and five of the six sites proved ideally suited for magnetostratigraphic analysis. The results presented in this paper and elsewhere in this volume constitute the first opportunity to extend the direct correlation of the magnetostratigraphic and biostratigraphic time-scales into the Paleogene in deep-sea cores.The magnetostratigraphic analyses from DSDP Leg 73 sediments are presented in this paper. The correlation of the magnetostratigraphy to the magnetic polarity time-scale provides tight age-depth control for the five sites analyzed, allowing the accurate calculation of sediment accumulation rates.The data presented here represent a remarkable record of the fine-scale polarity history of the Earth's magnetic field. These data place constraints on the interpretation of smallscale marine magnetic anomalies which are modelled equally effectively by field intensity fluctuations as polarity reversals. At least some of the "tiny wiggles" correspond to very short polarity units in the magnetostratigraphic record.By assuming an axial geocentric dipole, the inclination of the time-averaged magnetic field recorded in the sediments can be used to calculate the paleolatitude at which the sediments were deposited. Combining the age and average inclination information available from the magnetostratigraphy, we present paleolatitudes versus time for the Leg 73 drill sites.

Supplement to: Tauxe, Lisa; Tucker, Peter; Petersen, Nikolai P; LaBrecque, John L (1983): The magnetostratigraphy of Leg 73 sediments. Palaeogeography, Palaeoclimatology, Palaeoecology, 42(1-2), 65-90

Identifier
DOI https://doi.org/10.1594/PANGAEA.701751
Related Identifier IsSupplementTo https://doi.org/10.1016/0031-0182(83)90039-1
Related Identifier References https://doi.org/10.2973/dsdp.proc.73.123.1984
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.701751
Provenance
Creator Tauxe, Lisa; Tucker, Peter; Petersen, Nikolai P; LaBrecque, John L
Publisher PANGAEA
Publication Year 1983
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Resource Type Supplementary Publication Series of Datasets; Collection
Format application/zip
Size 6 datasets
Discipline Earth System Research
Spatial Coverage (-11.666W, -29.484S, 3.512E, -26.074N); South Atlantic/RIDGE; South Atlantic/HILL; South Atlantic/PLATEAU; South Atlantic/CANYON
Temporal Coverage Begin 1980-04-22T00:00:00Z
Temporal Coverage End 1980-05-21T00:00:00Z