Further Investigations on the Magnetic Properties of Cosmic Spherules

Details Further Investigations on the Magnetic Properties of Cosmic Spherules Further Investigations on the Magnetic Properties of Cosmic Spherules

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmgp43b1054r&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #GP43B-1054

Physics

[1540] Geomagnetism And Paleomagnetism / Rock And Mineral Magnetism, [5440] Planetary Sciences: Solid Surface Planets / Magnetic Fields And Magnetism

Scientific paper

Following earlier work of Suavet et al. (2009, JGR 114, doi:10.1029/2008JB005831) we investigated further the intrinsic magnetic properties of our large collection of cosmic spherules (CS) from the Transantartic Mountains (Rochette et al. 2008, PNAS 105, 18206), tripled after the 2009 expedition. In particular we measured 128 melted silicate CS larger than 800µm in diameter, and 38 iron CS larger than 400 µm in diameter. Measurements included hysteresis, and susceptibility anisotropy. A number of these CS were sectioned and investigated using electron microscopy. Those magnetite-rich large CS (up to 15 and 70% magnetite for silicate and iron respectively) appear to have similar magnetic properties than the smaller ones previously studied with strong and stable remanence carried by SD to PSD grains. However, there is a tendency for the largest CS (> 1 mm in diameter) to contain less magnetite due to limited oxidation in the atmospheric trajectory. For the iron CS, magnetization measurements appear to be an effective way to quantify non-destructively the wuestite/magnetite ratio, and to detect the rare CS which bear metal nuggets. Measurement of oxygen isotopic ratios reveals interesting correlations with magnetite amount and grain-size in the silicate CS. These correlations are interpreted in terms of different parent bodies and rate of evaporation/oxydation during atmospheric entry.

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