Megnetic susceptibility of a subtropical South Atlantic transect

DOI

The Mid-Pleistocene transition (MPT) of the global climate system, initiated by a shift towards much larger northern hemisphere ice shields at around 920 ka and ending with predominance of 100 kyr ice age cyclicity since about 640 ka, is one of the fundamental enigmas in Quaternary climate evolution. Climate proxy records not exclusively linked to global ice volume are necessary to advance understanding of the MPT. Here we present a high-resolution Pleistocene magnetic susceptibility time series of 12 sediment cores from the subtropical South Atlantic essentially reflecting dissolution driven variations in carbonate accumulation controlled by changes in deep water circulation. In addition to characteristics known from delta18O records, the data sets reveal three remarkable features intimately related to the MPT: (1) an all-Pleistocene minimum of carbonate accumulation in the South Atlantic at 920 ka, (2) a MPT interim state of reduced carbonate deposition, indicating that the MPT period may have been a discrete state of the Pleistocene deep water circulation and climate system and (3) a terminal MPT event at around 540-530 ka documented in several peculiarities such as thick laminated layers of the giant diatom Ethmodiscus rex.

Supplement to: Schmieder, Frank; von Dobeneck, Tilo; Bleil, Ulrich (2000): The Mid-Pleistocene climate transition as documented in the deep South Atlantic Ocean: initiation, interim state and terminal event. Earth and Planetary Science Letters, 179(3-4), 539-549

Identifier
DOI https://doi.org/10.1594/PANGAEA.735066
Related Identifier IsSupplementTo https://doi.org/10.1016/S0012-821X(00)00143-6
Related Identifier References https://nbn-resolving.org/urn:nbn:de:gbv:46-ep000102535
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.735066
Provenance
Creator Schmieder, Frank; von Dobeneck, Tilo ORCID logo; Bleil, Ulrich
Publisher PANGAEA
Publication Year 2000
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 13 datasets
Discipline Geosciences; Natural Sciences
Spatial Coverage (-38.802W, -34.183S, 7.533E, -21.587N); Angola Basin; Cape Basin; Eastern Rio Grande Rise; Namibia continental slope; Rio Grande Rise; Mid Atlantic Ridge; Hunter Channel
Temporal Coverage Begin 1988-03-04T00:00:00Z
Temporal Coverage End 1996-03-05T00:00:00Z