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Micromagnetic coercivity distributions and interactions in chondrules with implications for paleointensities of the early solar system
 

Summary: Micromagnetic coercivity distributions and interactions in chondrules
with implications for paleointensities of the early solar system
Gary Acton,1
Qing-Zhu Yin,1
Kenneth L. Verosub,1
Luigi Jovane,1,2
Alex Roth,1
Benjamin Jacobsen,1
and Denton S. Ebel3
Received 25 July 2006; revised 29 October 2006; accepted 28 November 2006; published 2 March 2007.
[1] Chondrules in chondritic meteorites record the earliest stages of formation of the solar
system, potentially providing information about the magnitude of early magnetic fields
and early physical and chemical conditions. Using first-order reversal curves (FORCs), we
map the coercivity distributions and interactions of 32 chondrules from the Allende,
Karoonda, and Bjurbole meteorites. Distinctly different distributions and interactions exist
for the three meteorites. The coercivity distributions are lognormal shaped, with Bjurbole
distributions being bimodal or trimodal. The highest-coercivity mode in the Bjurbole
chondrules is derived from tetrataenite, which interacts strongly with the lower-coercivity
grains in a manner unlike that seen in terrestrial rocks. Such strong interactions have the
potential to bias paleointensity estimates. Moreover, because a significant portion of the

  

Source: Acton, Gary - Department of Geology, University of California, Davis

 

Collections: Geosciences