DOI: 10.1016/j.epsl.2019.116042
论文题名: Paleomagnetism of Rumuruti chondrites suggests a partially differentiated parent body
作者: Cournède C. ; Gattacceca J. ; Rochette P. ; Shuster D.L.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 533 语种: 英语
中文关键词: dynamo magnetic field
; meteorite paleomagnetism
; partially differentiated body
; Rumuruti chondrites
英文关键词: Demagnetization
; Geomagnetism
; Interactive devices
; Iron ores
; Magnetite
; Magnetization
; Meteorites
; Solar system
; Extraterrestrial material
; Magnetic mineralogy
; Meteorite paleomagnetisms
; Paleomagnetic analysis
; partially differentiated body
; Protoplanetary nebulae
; Pseudo single domains
; Rumuruti chondrites
; Electromagnetic field effects
; chondrite
; magnetic field
; magnetization
; paleomagnetism
; parent body
; retrograde metamorphism
; solar system
英文摘要: Different types of magnetic fields were at work in the early solar system: nebular fields generated within the protoplanetary nebula, solar fields, and dynamo fields generated within the solar system solid bodies. Paleomagnetic studies of extraterrestrial materials can help unravel both the history of these magnetic fields, and the evolution of solar system solid bodies. In this study we studied the paleomagnetism of two Rumuruti chondrites (PCA 91002 and LAP 03639). These chondrites could potentially bear the record of the different fields (solar, nebular, dynamo fields) present during the early solar system. The magnetic mineralogy consists of pseudo-single domain pyrrhotite in LAP 03639 and pyrrhotite plus magnetite in PCA 91002. Paleomagnetic analyses using thermal and alternating field demagnetization reveal a stable origin trending component of magnetization. Fields of 12 μT or higher are required to account for the magnetization in PCA 91002, but the timing and exact mechanism of the magnetization are unconstrained. In LAP 03639, considering various chronological constraints on the parent body evolution and on the evolution of the different sources of magnetic field in the early solar system, an internally-generated (dynamo) field of ∼5 μT recorded during retrograde metamorphism is the most likely explanation to account for the measured magnetization. This result indicates the existence of an advecting liquid core within the Rumuruti chondrite parent body, and implies that, as proposed for CV and H chondrites, this chondritic parent body is partially differentiated. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164930
Appears in Collections: 气候变化与战略
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作者单位: Institute for Rock Magnetism, Department of Earth Sciences, University of Minnesota, 150 John T. Tate Hall, 116 Church St SE, Minneapolis, MN 55455, United States; CNRS, Aix Marseille Univ, IRD, Coll France, INRAe, CEREGE, Aix-en-Provence, France; Department of Earth and Planetary Science, University of California–Berkeley, 307 McCone Hall, Berkeley, CA 94720, United States; Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, CA 94709, United States
Recommended Citation:
Cournède C.,Gattacceca J.,Rochette P.,et al. Paleomagnetism of Rumuruti chondrites suggests a partially differentiated parent body[J]. Earth and Planetary Science Letters,2020-01-01,533