Data Publication

Magnetochronostratigraphic data from marine sediments off Patagonia, SE Pacific – cores from expedition MR16-09 Leg 2, Japanese RV Mirai, 2017

GFZ Data Services

(2024)

Descriptions

Sediment cores PC02, PC03, and PC04 were recovered during the ship expedition MR16-09 Leg 2 of Japanese RV Mirai in 2017 (Murata et al., 2017) using piston corers. For paleo- and rock magnetic analyses clear plastic boxes with a volume of 7 cm3 were pressed into the split halves of the generally 1 m long sections of the sediment cores. X-ray fluoresence (XRF) scans were performed with an Itrax XRF Corescanner (Cox Analytical systems) at Kochi Core Center, Japan (Hagemann et al. 2024). The downcore resolution was set to 5 mm, and the scans were performed with a Mo X-ray tube at 30 kV and 55 mA for a measurement time of 15 s. The Itrax X-ray beam was set to 0.2 mm × 20 mm. Measurements of low-field magnetic susceptibility (klf same as: k-bulk) and its anisotropy (AMS) were performed with an AGICO MFK1-A susceptibility meter. The principal AMS axes Kmax, Kint, and Kmin, the three axes of the anisotropy ellipsoid, were used to calculate the degree of anisotropy, as well as the shape factor of anisotropy. The frequency dependency of magnetic susceptibility was determined with an automated MAGNON Variable Field Susceptibility Meter (VFSM) by measuring magnetic susceptibility at different frequencies with logarithmically equidistant steps at a field amplitude of 250 µT. Susceptibilities of core PC02 samples were measured at 7 frequencies F from 375 Hz to 4775 Hz. Samples from cores PC03 and PC04 were measured at 5 frequencies from 475 to 4775 Hz. The frequency dependency Dk/Dlog(F) then was determined by linear regression of susceptibility k versus the decadal logarithm of frequency F. Values are given as decay rate in percent over one frequency decade (% / decade (F)) relative to the measurement at the lowest frequency. Thus, values obtained are negative. Measurements of the natural remanent magnetization (NRM) and of the anhysteretic remanent magnetization (ARM) were performed with a 2G 755 SRM long-core cryogenic magnetometer. ARMs were produced with a 2G660 single-axis alternating field (AF) demagnetizer using 100 mT alternating field and 50 µT static field. NRMs and ARMs both were stepwise demagnetized with the in-line 3-axes AF demagnetizer of the cryogenic magnetometer. AF steps for NRM: 0, 5, 10, 15, 20, 30, 40, 50, 65, 80, 100 mT. AF steps for ARM: 0, 10, 20, 30, 40, 50, 65, 80 mT. Iso-thermal remanent magnetizations (IRM) were imparted with a 2G 660 pulse magnetizer using 1500 mT for producing a saturation magnetization (SIRM) and -200 mT for remagnetization of the low-coercive fraction. Measurements were performed with a Molyneux spinner magnetometer. Data records were turned into time series by applying the age model for PC03 (Hagemann et al., 2024), correlating PC02 to PC03, and correlating PC04 to PC03 (back to 140 ka) and further using the PISO1500 paleointensity stack (Channell et al., 2009), paleomagnetic data from the Black Sea (Liu et al., 2020, Nowaczyk et al., 2021), and paleoclimatic data from Antarctica (Jouzel et al., 2007; Bazin et al., 2013) for reference for older core sections.

Keywords

Originally assigned keywords

remanent magnetization

SE Pacific

Palaeomagnetism

Magnetic properties

Palaeointensity

EPOS

multi-scale laboratories

paleomagnetic and magnetic data

paleomagnetic data

magnetic susceptibility

relative paleointensity variations

Core

EARTH SCIENCE > SOLID EARTH > GEOMAGNETISM > MAGNETIC FIELD > MAGNETIC DECLINATION

EARTH SCIENCE > SOLID EARTH > GEOMAGNETISM > MAGNETIC FIELD > MAGNETIC INCLINATION

EARTH SCIENCE > SOLID EARTH > GEOMAGNETISM > MAGNETIC FIELD > MAGNETIC INTENSITY

EARTH SCIENCE > SOLID EARTH > GEOMAGNETISM > PALEOMAGNETISM

remanent magnetisation > demagnetisation type AF

Sedimentary

Corresponding MSL vocabulary keywords

remanent magnetisation

magnetic susceptibility

MSL enriched keywords

Measured property

remanent magnetisation

magnetic susceptibility

Apparatus

natural remanent magnetisation measurement

cryogenic magnetometer

spinner magnetometer

laboratory induced remanent magnetisation measurement

isothermal remanent magnetiser (IRM)

magnetic susceptibility measurements

susceptibility meter

demagnetiser

alternating field (AF) demagnetiser

paleointensity

anhysteretic remanent magnetisation (ARM)

isothermal remanent magnetisation (IRM)

natural remanent magnetisation (NRM)

Inferred behavior

anisotropy of magnetic susceptibility and remanence

natural remanent magnetisation (NRM) orientation

magnetic mineralogy analyses

remanent magnetisation stability

natural remanent magnetisation processing

relative paleointensity

equipment

mass spectrometer

accelerator mass spectrometer

x-ray spectrometer

x-ray fluorescence spectrometer

MSL enriched sub domains i

paleomagnetism

geochemistry

Source

https://dataservices.gfz-potsdam.de/panmetaworks/showshort.php?id=7887a742-4519-11ef-967a-4ffbfe06208e

Source publisher

GFZ Data Services

DOI

10.5880/gfz.4.3.2024.003

Creators

Nowaczyk, Norbert R.

GFZ German Research Centre for Geosciences, Potsdam, Germany

ORCID:

https://orcid.org/0000-0002-3362-0578

Liu, Jiabo

GFZ German Research Centre for Geosciences, Potsdam, Germany | Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan, Hubei, China

ORCID:

https://orcid.org/0000-0002-6150-1322

Hagemann, Julia

Alfred-Wegener-Institut Helmholtz-Zentrum für Meeres- und Polarforschung, Bremerhaven, Germany

Arz, Helge W.

Leibnitz Institute for Baltic Sea Research Warnemünde, Rostock, Germany

ORCID:

https://orcid.org/0000-0002-1997-1718

Iwasaki, Shinya

Graduate School of Environmental Science, Hokkaido University, Sapporo 060-0810, Japan

Murayama, Masafumi

Faculty of Agriculture and Marine Science, Kochi University, Nankoku, Kochi 783-8502, Japan | Center for Advanced Marine Core Research, Kochi University, Nankoku, Kochi 783-8502, Japan

Contributors

Laboratory For Earth Magnetism In Time And Space (GFZ German Research Centre For Geosciences, Germany)

HostingInstitution

GFZ German Research Centre for Geosciences, Potsdam, Germany

Nowaczyk, Norbert R.

ContactPerson

GFZ German Research Centre for Geosciences, Potsdam, Germany

Nowaczyk, Norbert R.

ContactPerson

GFZ German Research Centre for Geosciences, Potsdam, Germany

References

10.5194/cp-9-1715-2013

10.1016/j.epsl.2009.03.012

10.1073/pnas.2302983121

10.1126/science.1141038

10.1111/j.1365-246x.1980.tb02601.x

10.1029/2019jb019225

https://cchdo.ucsd.edu/data/13740/Cruise_Report_MR16-09_20170725.pdf

10.1029/2020jb021350

Citation

Nowaczyk, N. R., Liu, J., Hagemann, J., Arz, H. W., Iwasaki, S., & Murayama, M. (2024). Magnetochronostratigraphic data from marine sediments off Patagonia, SE Pacific – cores from expedition MR16-09 Leg 2, Japanese RV Mirai, 2017 [Data set]. GFZ Data Services. https://doi.org/10.5880/GFZ.4.3.2024.003

Dates

Issued:

2024

Rights

Creative Commons Attribution 4.0 International

Geo location(s)

Core MR16-09-2-PC02

Core MR16-09-2-PC03

Core MR16-09-2-PC04