USING PALEOMAGNETISM TO DETERMINE PALEOGEOGRAPHIC HISTORY AND TECTONIC RELATIONS OF THE SINCLAIR TERRANE, NAMIBIA
Siliciclastic sediments and lava flows of the Guperas Formation, as well as a post-Guperas bimodal dyke suite, were sampled around the town of Helmeringhausen. The samples are being prepared and analyzed in the Yale University paleomagnetism laboratory using alternating-field and controlled-atmosphere thermal demagnetization techniques. Preliminary results show best results from the post-Guperas dykes, revealing a stable characteristic remanence directed shallowly to the north or south. Within the directly overlying Auborus Formation, clasts of volcanic rocks that are likely sourced from Guperas flows and post-Guperas dykes show highly dispersed remanence directions. This indicates a Proterozoic age of remanence. Baked-contact tests on the dykes, intruding older volcanic rocks of the Barby Formation, are currently being carried out. Samples have also been collected for U-Pb geochronology, which will provide precise ages for the resulting paleomagnetic poles obtained in this study.