Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmgp33a..07k&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #GP33A-07
Physics
1517 Magnetic Anomalies: Modeling And Interpretation, 1519 Magnetic Mineralogy And Petrology, 1521 Paleointensity, 1540 Rock And Mineral Magnetism, 1599 General Or Miscellaneous
Scientific paper
Remanent magnetization of titanohematite lamellae within oxide assemblages in crustal rocks has been proposed to be a source for intense magnetic anomalies both on Earth as well as Mars. In an attempt to explain the origin of such strong magnetization in titanohematite bearing rocks, two hypotheses have been proposed. First hypothesis (Robinson et al., 2002) proposes a new type of magnetization (lamellar magnetization) associated with the contact zone between the ferrian ilmenite and titanohematite. Second hypothesis proposes that the intense magnetization is a consequence of an "empirical law" related to the low saturation magnetization of titanohematite (Kletetschka et al., 2006). We evaluate these two hypotheses in light of temperature dependent Mossbauer spectra and magnetic measurements. Resulting measurements determine that strong magnetization of titanohematite is due to large canting angle (32 degree from the anti-parallel arrangement) causing ferromagnetic contribution of the titanohematite to the overall magnetization. We also show that the smallest titanohematite lamellae demonstrate blocking temperature near 300C and do not enhance but diminish the overall remanent magnetization. High and low temperature Mossbauer spectra show that titanohematite and ferrian ilmenite are magnetically independent phases and contradict the lamellar magnetism hypothesis coined by Robinson et al., (2002).
Adachi Tadashi
Hermanek Martin
Kletetschka Gunther
Mikula Vilem
Wasilewski Peter J.
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