Rock Magnetic Results from the Early Ordovician Limestone Rocks in the Northern Qaidam Block, Tibetan Plateau

The early Ordovician location of the Qaidam Block remains unclear, mainly due to sparse paleomagnetic data quantitatively determine coeval position. limestone is widespread in northern providing an ideal window obtain a result. results derived from are, however, frequently constrained by hydrothermal fluid activities after strata formed and complex magnetic minerals samples. Therefore, systematic petrological rock studies were conducted identify content composition samples Duoquanshan Formation Block. petrologic show that carriers are dominated magnetite with small amount pyrrhotite, goethite, hematite. These consistent characteristics stepwise demagnetization. Combined published previously, secondary remanence component carried pyrrhotite might be produced thermal or magma active multiple Tethys evolution.