An attempt to define the Curie point isotherm in northern and central Arizona

Magnetic total intensity anomalies in northern and central Arizona have been analyzed to locate the bases of the polarized source bodies. The base of the magnetic crust is interpreted as the position of the Curie point isotherm. Results indicate a zone of shallow Curie depth ( approximately 10 km) in a belt, about 60 km wide, running through the center of the state. This zone, near the northern border of the Basin-Range province, is flanked on the north and south by areas of greater Curie depth ( approximately 20 km). The results are in agreement with regional variations in P n velocity in Arizona.