Abstract
The Kapok Mississippi Valley-type (MVT) Zn Pb deposit infills dilatent zones in the Kapok fault system that cuts Upper Devonian carbonates. Paleomagnetic methods have isolated an extremely weak characteristic remanent magnetization in 89 of 98 specimens from 9 sites in mineralization and host rocks. Its pole position defines an age of 351 ± 8 Ma, concordant with a 238U 206Pb calcite age of 351 ± 15 Ma from the Kapok and Goongewa deposits and a Rb Sr sphalerite age of 357 ± 3 Ma from the Pillara deposit. The agreement of the three independent direct dating methods implies a single MVT mineralizing event throughout the Lennard Shelf shortly after host rock deposition and its subsequent rift faulting to form the Canning Basin.
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