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The vast majority of palaeomagnetic recordings held in rock and meteorites are contained in small inhomogeneously magnetised particles that have a single-vortex (SV) domain state. The reliability and fidelity of the magnetic recording in these particles can only be determined using a numerical micromagnetic approach. This data set provides the first comprehensive examination of domain state as a function of grain size, grain shape and temperature for both magnetite and iron. The results show that SV domain states are highly stable, and in some cases more stable than their ‘ideal’ uniformly magnetized counterparts. With the data sets in this archive it is possible to determine the magnetic recording and stability characteristics of assemblies of grains that can be matched to a wide variety of grain distributions found in terrestrial rocks and meteorites.
The dataset created includes natural remanent magnetisation (NRM) of archive-half core sections recovered at nine sites (i.e. Sites U1422, U1423, U1424, U1425, U1426, U1427, U1428, U1429, and U1430) during IODP Expedition 346. NRM of the archive-half core sections were measured at every 5-cm interval resolution before and after 20-mT alternating field (AF) demagnetisation treatment. The dataset created also includes NRM of discrete samples taken from working-half core sections (typically one discrete sample per core from the longest hole at each drilling site). NRM of discrete samples were measured before and after a complete stepwise AF demagnetisation routine (up to 60-mT peak AF field). All NRM data collected were used to construct magnetostratigraphy for all sites drilled during Expedition 346. All data have been published in IODP proceedings Volume 346 (http://publications.iodp.org/proceedings/346/346toc.htm).
All the raw experimental data obtained for the study reported in Hodgson, E., Grappone, J. M., Biggin, A. J., Hill, M. J., & Dekkers, M. J. (2018). Thermoremanent behavior in synthetic samples containing natural oxyexsolved titanomagnetite. Geochemistry, Geophysics, Geosystems, 19. https://doi.org/10.1029/2017GC007354
Data from the IODP Expedition will be archived by the International Ocean Discovery Program, including all data generated during the shipboard palaeomagnetic and magnetic anisotropy analyses and all of the logging data (FMS tool, GBM data), plus associated explanatory notes. Shore based palaeomagnetic and magnetic anisotropy data, FMS---based reorientation parameters, and downhole magnetizations inferred from modelling of the GBM borehole magnetometer data will be made available to the international community via appropriate IODP Data Reports (in addition to primary journal articles). Data Includes: Shipboard cryogenic magnetometer data Shipboard and shore based discrete sample remanence data Shipboard and shore based magnetic anisotropy data FMS---based reorientation parameters Magnetic parameters modelled using borehole magnetometer data