High-resolution palaeomagnetic record from Sea of Marmara sediments for the last 70 ka

Özlem Makaroglu*, Norbert R. Nowaczyk, Kadir K. Eriş, M. Namık Çagatay

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Magnetostratigraphic and geochemical analyses were performed on two sediment cores recovered from the Sea of Marmara to investigate geomagnetic field variations over the last 70 ka. A chronology for each of the two cores was developed from eight AMS 14C datings, tephrochronology, and tuning of Ca concentrations with stadials and interstadials observed in Greenland ice core oxygen isotope data. Based on the age models, cores MD01–2430 and MRS-CS19 reach back to 70 and 32 ka, respectively. High average sedimentation rates of 43 cm kyr–1 for core MD01–2430 and 68 cm kyr–1 for core MRS-CS19 allow high-resolution reconstruction of geomagnetic field variations for the Sea of Marmara. Mineral magnetic properties are sensitive to glacioeustatic sea level changes and palaeoclimate variations in this region, reflecting the variable palaeoenvironmental conditions of the Sea of Marmara during last 70 ka. Despite the impairment of the palaeomagnetic record in some stratigraphic intervals due to early diagenesis, relative palaeointensity variations in the Sea of Marmara sediments correlate well with similar records derived from other regions, such as the nearby Black Sea and the GLOPIS-75 stack. The directional record derived from the Sea of Marmara cores exhibits typical palaeosecular variation patterns, with directional anomalies at 41 and 18 ka, representing the Laschamps and postulated Hilina Pali excursions, respectively. Both directional anomalies are also associated with palaeointensity minima. A further palaeointensity minimum at 34.5 ka is likely related to the Mono Lake excursion, with no directional deviation documented in the Sea of Marmara palaeomagnetic record so far.

Original languageEnglish
Pages (from-to)2024-2039
Number of pages16
JournalGeophysical Journal International
Volume222
Issue number3
DOIs
Publication statusPublished - 2021

Bibliographical note

Publisher Copyright:
© The Author(s) 2020.

Funding

This study was supported by the Scientific and Technological Research Council of Turkey (TUBITAK 115Y773) and the Deutscher Akademischer Austauschdienst (DAAD Funding 57210259). We thank Pierre Henry for supporting work on core MRS-CS19 and Frank Bassinot for sampling of core MD01–2430 at CNRS, Gifsur-Yvette. We thank Nurcan Kaya, Melda Küçükdemirci, Mümtaz Hisarlı, Idil Urla, Gülay Işgüder and the EMCOL group for technical and logistical help during core processing and sampling. The authors also thank Andrew Roberts and the anonymous reviewer for their constructive comments that improved the paper.

FundersFunder number
Deutscher Akademischer Austauschdienst France
Deutscher Akademischer AustauschdienstMRS-CS19, 57210259
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu115Y773
Centre National de la Recherche Scientifique

    Keywords

    • Geomagnetic excursions
    • Marine magnetics and palaeomagnetics
    • Palaeointensity
    • Palaeomagnetic secular variation
    • Palaeomagnetism

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