A rock- and paleomagnetic study of a Holocene lava flow in Central Mexico

Magnetic measurements of the Tres Cruces lava flow ca. 8500 years BP, Central Mexico show the presence of two remanence carriers, a Ti-rich titanomagnetite with a Curie temperature between 350 and 4008C and a Ti-poor magnetite with a Curie temperature close to 5808C. Magnetic changes after heating indicate that the titanomagnetite exsolves into magnetite w and ilmenite when the sample is heated to 5808C. Paleointensity estimates with the Thellier and Thellier method Thellier, E., Thellier, O., 1959. Sur l'intensite du champ magnetique terrestre dans le passe historique et geologique. Ann. ´´ ´