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Magnetization of Extraterrestrial Allende material may relate to terrestrial descend
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SYSNO ASEP 0490441 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Magnetization of Extraterrestrial Allende material may relate to terrestrial descend Tvůrce(i) Kletetschka, Günther (GLU-S) RID, SAI, ORCID Zdroj.dok. Earth and Planetary Science Letters. - : Elsevier - ISSN 0012-821X
Roč. 487, 1 April 2018 (2018), s. 1-8Poč.str. 8 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova Allende ; magnetic dynamo ; paleomagnetism ; bolide ; decelerating magnetization Vědní obor RIV BN - Astronomie a nebeská mechanika, astrofyzika Obor OECD Astronomy (including astrophysics,space science) Institucionální podpora GLU-S - RVO:67985831 UT WOS 000429754000001 EID SCOPUS 85044760859 DOI 10.1016/j.epsl.2018.01.020 Anotace The origin of magnetization in Allende may have significant implications for our understanding of core formation/differentiation/dynamo processes in chondrite parent bodies. The magnetic Allende data may contain information that could constrain the magnetic history of Allende. The measurements on Allende chondrules reveal an existence of magnetization component that was likely acquired during the meteorite transit to terrestrial conditions. Both the pyrrhotite carrying magnetic remanence intensity and direction of the chondrules change erratically when subjecting the Allende meteorite's chondrules to temperatures near 77 K and back to room temperature. Chondrules with more intense original magnetization are denser and contain larger inverse thermoremanent magnetization (lTRM). Temperature dependent monitoring of lTRM revealed that magnetization was acquired at temperature near 270 K. Such temperature is consistent with the condition when, in addition to temperature increase, the atmospheric uniaxial pressure applied during the meteorite entry on the porous material was responsible for meteorite break up in the atmosphere. During this process, collapse of the pore space in the matrix and some chondrules would generate crystalline anisotropy energy accumulation within pyrrhotite grains in form of parasitic magnetic transition. Pracoviště Geologický ústav Kontakt Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Rok sběru 2019
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