Abstract
Thermal and alternating field cleaning treatments of Cambrian sedimentary and volcanic rocks from the Moroccan Anti-Atlas yield three directions of magnetization. The oldest, of high thermal stability, gives a new Cambrian pole 47°N, 42°E with an associated radiometric age of 530 m.y. A secondary magnetization, of lower thermal stability, has been superimposed during a thermal event which occurred in Permo-Triassic time, according to the palaeomagnetic evidence (pole 47°S, 88°E). A third component was acquired viscously in the present-day magnetic field direction. This study emphasises the possibility of thermal demagnetization measurements, particularly on hematite-bearing rocks, and of comparing superimposed magnetizations with radiometric resetting ages.
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