NDLI: Secondary Fe–Mn-oxides in minerals heavily damaged by α-recoil: possible implications for palaeomagnetism

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Secondary Fe–Mn-oxides in minerals heavily damaged by α-recoil: possible implications for palaeomagnetism

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International Journal of Earth Sciences : Volume 96, Issue 1, February 2007

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Secondary Fe–Mn-oxides in minerals heavily damaged by α-recoil: possible implications for palaeomagnetism

Content Provider	Springer Nature Link
Author	Romer, Rolf L. waczyk, rbert Wirth, Richard
Copyright Year	2006
Abstract	Sub-micron Fe,Mn-oxides in columbite–tantalite minerals are bound to metamict domains in the host. These nano-oxides are secondary minerals as the metamict zones formed through accumulation of damages from α-recoil, each of which in a small volume destroys the crystal lattice of the U and Th bearing columbite–tantalite host. Transmission electron microscope investigations demonstrate that the oxides fall in the compositional range of magnetite–jacobsite–iwakiite (Fe,Mn)3O4 and of hematite-type minerals along the Fe2O3–Mn2O3 join, i.e., minerals that are known to be major carriers of magnetic remanence. Measured magnetic properties of isolated columbite–tantalite crystals demonstrate in some samples magnetic remanence, which is bound to sub-micron pseudosingle-domain crystals rather than to the host. Thus, the magnetic remanence is not related to the formation of columbite–tantalite, but to the crystallization of the nano-oxides, which occur in metamict domains of the host and therefore are secondary. Depending on the content and distribution of U and Th, the nano-oxides may form diachronously within an individual and among several host crystals. Magnetic secondary nano-oxides are not restricted to columbite–tantalite minerals, but may occur in other minerals where high contents of Fe and Mn are associated with high contents of U and Th. Rocks that show the same spatial distribution for U and Fe, as for instance some red sandstones, may display magnetic properties that are controlled by recoil-induced growth of secondary Fe-oxides.
Starting Page	375
Ending Page	387
Page Count	13
File Format	PDF
ISSN	14373254
Journal	International Journal of Earth Sciences
Volume Number	96
Issue Number	2
e-ISSN	14373262
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-06-02
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	α-Recoil Metamictization Palaeomagnetism Magnetic remanence TEM Columbite–tantalite Fe,Mn-oxides Geophysics/Geodesy Geology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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