DOI: 10.1016/j.epsl.2018.01.020
Scopus记录号: 2-s2.0-85044760859
论文题名: Magnetization of Extraterrestrial Allende material may relate to terrestrial descend
作者: Kletetschka G.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 487 起始页码: 1
结束页码: 8
语种: 英语
英文关键词: Allende
; bolide
; decelerating magnetization
; magnetic dynamo
; paleomagnetism
Scopus关键词: Geomagnetism
; Inverse problems
; Iron ores
; Magnetization
; Meteorites
; Porous materials
; Allende
; bolide
; Crystalline anisotropy
; Magnetic dynamos
; Magnetization components
; paleomagnetism
; Temperature dependent
; Thermoremanent magnetization
; Atmospheric temperature
英文摘要: 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 (ITRM). Temperature dependent monitoring of ITRM 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. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110017
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Institute of Geology, Academy of Sciences of the Czech Republic, Czech Republic; Faculty of Science, Charles University, Czech Republic; Department of Geology and Geophysics, University of Alaska, Fairbanks, United States
Recommended Citation:
Kletetschka G.. Magnetization of Extraterrestrial Allende material may relate to terrestrial descend[J]. Earth and Planetary Science Letters,2018-01-01,487