Rock magnetic study of the Early Paleozoic limestone from northern part of Henan Province

Rock magnetic study was carried out on the samples of non-remagnetized Lower Paleozoic limestone from Henan Province. These studies suggest that the properties of the natural remanent magnetization are usually dependent on the grain size of magnetic carrier, e.g. the grain size of magnetite mineral (multidomain or single domain). The different contents of the single and multi-domain magnetites could cause the different levels of overlapping of the middle-high and high temperature components. This may be the reason for “easy” or “difficult” separation of magnetic components.