EarthRef.org Reference Database (ERR) -- Cioppa & Kodama 2003

Three localities of the Mississippian Mauch Chunk Formation around the Pennsylvania Salient (Broad Top Synclinorium, Minersville Syncline, and a sublocality in the Minersville Syncline) were sampled for detailed paleomagnetic and strain analysis. Paleomagnetic analysis showed three magnetization components: an intermediate-temperature B component (Tb 620¿C), and an SW component, unblocked over a wide range of temperatures and observed only on the northern segment of the salient. Normalized Fry strain and Rf/f strain were measured in three dimensions and correlated to the paleomagnetic results. At one site (JTSF locality), a clear correlation between the amount of strain (ϵs) and remanence direction indicates that axial planar cleavage formation has caused remanence rotation. The correlations at the Minersville Syncline and Broad Top Synclinorium are not definitive, but suggest that different mechanisms are operating. The observed heterogeneity in paleomagnetic response to strain indicates that the effects will be strongly dependent on the strain history at a particular site. Three localities of the Mississippian Mauch Chunk Formation around the Pennsylvania Salient (Broad Top Synclinorium, Minersville Syncline, and a sublocality in the Minersville Syncline) were sampled for detailed paleomagnetic and strain analysis. Paleomagnetic analysis showed three magnetization components: an intermediate-temperature B component (Tb 620¿C), and an SW component, unblocked over a wide range of temperatures and observed only on the northern segment of the salient. Normalized Fry strain and Rf/f strain were measured in three dimensions and correlated to the paleomagnetic results. At one site (JTSF locality), a clear correlation between the amount of strain (ϵs) and remanence direction indicates that axial planar cleavage formation has caused remanence rotation. The correlations at the Minersville Syncline and Broad Top Synclinorium are not definitive, but suggest that different mechanisms are operating. The observed heterogeneity in paleomagnetic response to strain indicates that the effects will be strongly dependent on the strain history at a particular site.