PALEOMAGNETIC INSIGHT INTO THE EMPLACEMENT HISTORY OF THE NORTHEASTERN FLANK OF MOUNT PENNELL, HENRY MOUNTAINS, UTAH
Seven paleomagnetic sites, four igneous and three sedimentary, were drilled on the northeastern flank of Mount Pennell, generating 75 specimens. One- and two-component system demagnetization styles were observed. For systems comprised of two components, the high coercivity component was selected as the thermoremanent magnetization. Relative ages of intrusions are interpreted based on increased deviation, in older igneous rocks, between expected and observed magnetization orientations. The magnetic vectors obtained from the seven sites indicate that the rocks obtained their vector in situ, suggesting the rocks were emplaced in their inclined state, after tilting of the host strata. The sedimentary rocks contain the same magnetic unit vector as the igneous rocks, suggesting that the emplacement of the pluton reset the magnetic vector of the sedimentary rocks.