dc.contributor.author |
Bezaeva N. |
|
dc.contributor.author |
Chareev D. |
|
dc.contributor.author |
Rochette P. |
|
dc.contributor.author |
Kars M. |
|
dc.contributor.author |
Gattacceca J. |
|
dc.contributor.author |
Feinberg J. |
|
dc.contributor.author |
Sadykov R. |
|
dc.contributor.author |
Kuzina D. |
|
dc.contributor.author |
Axenov S. |
|
dc.date.accessioned |
2018-09-19T22:05:23Z |
|
dc.date.available |
2018-09-19T22:05:23Z |
|
dc.date.issued |
2016 |
|
dc.identifier.issn |
0031-9201 |
|
dc.identifier.uri |
https://dspace.kpfu.ru/xmlui/handle/net/144676 |
|
dc.description.abstract |
© 2016 Elsevier B.V..Here we present a comprehensive magnetic characterization of synthesized non-ideal single-domain (SD) monoclinic pyrrhotite (Fe7S8). The samples were in the form of a powder and a powder dispersed in epoxy. "Non-ideal" refers to a powder fraction of predominantly SD size with a minor contribution of small pseudo-single-domain grains; such non-ideal SD pyrrhotite was found to be a remanence carrier in several types of meteorites (carbonaceous chondrites, SNC. . .), which justifies the usage of synthetic compositions as analogous to natural samples. Data were collected from 5 to 633 K and include low-field magnetic susceptibility (χ0), thermomagnetic curves, major hysteresis loops, back-field remanence demagnetization curves, first-order reversal curves (FORCs), alternating field and pressure demagnetization of saturation isothermal remanent magnetization (SIRM), low temperature data (such as zero-field-cooled and field-cooled remanence datasets together with room temperature SIRM cooling-warming cycles) as well as XRD and Mössbauer spectra. The characteristic Besnus transition is observed at ∼33 K. FORC diagrams indicate interacting SD grains. The application of hydrostatic pressure up to 2 GPa using nonmagnetic high-pressure cells resulted in the demagnetization of the sample by 32-38%. Repeated cycling from 1.8 GPa to atmospheric pressure and back resulted in a total remanence decrease of 44% (after 3 cycles). Pressure demagnetization experiments have important implications for meteorite paleomagnetism and suggest that some published paleointensities of meteorites with non-ideal SD monoclinic pyrrhotite as remanence carrier may be lower limits because shock demagnetization was not accounted for. |
|
dc.relation.ispartofseries |
Physics of the Earth and Planetary Interiors |
|
dc.subject |
Magnetic properties |
|
dc.subject |
Non-ideal single-domain monoclinic pyrrhotite |
|
dc.subject |
Pressure demagnetization |
|
dc.title |
Magnetic characterization of non-ideal single-domain monoclinic pyrrhotite and its demagnetization under hydrostatic pressure up to 2 GPa with implications for impact demagnetization |
|
dc.type |
Article |
|
dc.relation.ispartofseries-volume |
257 |
|
dc.collection |
Публикации сотрудников КФУ |
|
dc.relation.startpage |
79 |
|
dc.source.id |
SCOPUS00319201-2016-257-SID84971654665 |
|