Skip to main content
Earth, Planets and Space
Fig. 5 | Earth, Planets and Space

Fig. 5

From: Paleomagnetic study of basaltic rocks from Baengnyeong Island, Korea: efficiency of the Tsunakawa–Shaw paleointensity determination on non-SD-bearing materials and implication for the early Pliocene geomagnetic field intensity

Fig. 5

Two examples of results of the IZZI-Thellier API experiments. For each example, the Arai diagram (left-hand), the orthogonal projection of the zero-field steps (NRMs) (upper right-hand), and the equal-area projection of NRMs and laboratory-induced TRMs in the specimen coordinate systems (lower right-hand) are shown. In each Arai diagram, filled (open) circles represent the ZI (IZ) steps, triangles are the pTRM checks, and each green line and the two neighboring dotted lines are the best-fit lines for each of the selected temperature steps and the associated threshold lines that define boundaries for the SCAT statistics (see Shaar and Tauxe 2013 for details). The Arai diagrams show curved (or kinked) patterns with different degrees of the curvature (k = 1.243 and k = 0.720, respectively), resulting in obtaining no qualified API estimate when applying the conventional best-fitting line technique. For each Arai diagram two examples of the best-fitting line are shown with the associated statistical values (see text for details). For the orthogonal projection, filled circles (open squares) show projections of data at temperature steps on the y–x (z–x) plane and the x-axis is rotated to the horizontal direction of the initial NRM. For the equal-area projection, circles (triangles) represent NRM (TRM) data at temperature steps and filled (open) symbols represent projection of data on the lower (upper) hemisphere

Back to article page