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

Rock magnetic study was carried our on the samples of non-remagnetized Lowe r Paleozoic limestone from Henan Province. These studies suggest that the p roperties of the natural remanent magnetization are usually dependent on th e grain size of magnetic carrier, e.g, the grain size Of magnetite mineral (multidomain or single domain). The different contents of the single and mu lti-domain magnetites could cause the different levels of overlapping of th e middle-high and high temperature components. This may be the reason for " easy" or "difficult" separation of magnetic components.