FN Archimer Export Format
PT J
TI High-resolution palaeomagnetic record from Sea of Marmara sediments for the last 70 ka
BT 
AF Makaroğlu, Özlem
   Nowaczyk, Norbert R
   Eriş, Kadir K
   Çağatay, M Namık
AS 1:1;2:2;3:3;4:3;
FF 1:;2:;3:;4:;
C1 Istanbul University-Cerrahpaşa, Engineering Faculty, Geophysical Engineering Department, 34320, Avcılar, Istanbul, Turkey
   Helmholtz Centre Potsdam, German Research Centre for Geosciences GFZ, Section 4.3 – Climate Dynamics and Landscape evolution, 14473 Potsdam, Germany
   Istanbul Technical University, Faculty of Mining, EMCOL Research Centre and Geological Engineering Department, Ayazağa, 34469 İstanbul, Turkey
C2 UNIV ISTANBUL, TURKEY
   GFZ, GERMANY
   UNIV TECH ISTANBUL, TURKEY
IF 1.544
TC 5
UR https://archimer.ifremer.fr/doc/00632/74416/74131.pdf
LA English
DT Article
CR MD 123 / GEOSCIENCES 1
BO Marion Dufresne
DE ;Geomagnetic excursions;Marine magnetics and palaeomagnetics;Palaeointensity;Palaeomagnetic secular variation;Palaeomagnetism
AB 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 ka and 32 ka, respectively. High average sedimentation rates of 43 cm/kyr for core MD01–2430 and 68 cm/kyr 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 ka 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. 
PY 2020
PD SEP
SO Geophysical Journal International
SN 0956-540X
PU Oxford University Press (OUP)
VL 222
IS 3
UT 000565895200035
BP 2024
EP 2039
DI 10.1093/gji/ggaa281
ID 74416
ER

EF