摘要：This note presents initial results of a paleomagnetic
study of obsidian from twenty localities in the
eastern, central and western sectors of the Trans-Mexican
volcanic belt in central Mexico. We focus on the coercivity
and vector composition of the remanent magnetization,
which are critical for paleodirectional and paleointensity
studies. Alternating field demagnetization shows that
obsidians carry single and two-component magnetizations
residing in low- and high-coercivity magnetic minerals,
with discrete and overlapping coercivity spectra. Magnetic
minerals are likely iron-titanium oxides with fine-grain
sizes characterized by pseudo-single domain states.
