Paleomagnetic results from accretional complexes of Taigonos peninsula and their paleotectonic application.

Mesozoic island-arc and oceanic rocks were sampled from accretional complexes of Uda-Murgal volcanic belt (Taigonos peninsula). Overprint components were obtained for: 1) Late Jurassic paleoarc basalts (D=10.6, I=72.7, k=44.6, a95=9.1); 2) Late Triassic oceanic sediments (D=70.5, I=73.7, k=61.1, a95=3.2); 3) Hauterivian forarc sediments (D=18.6, I=79.4, k=33.8, a95=3.3). Postfolding components, obtained for Late Jurassic basalts and Late Triassic oceanic sediments, have a good agreement with regional direction of remagnetization. Component, obtained in Hauterivian sediments indicate that these rocks were remagnetizated before folding. Prefolding component, isolated in Late Jurassic basalts (D=196.4, I=49.8, k=54.4, a95=5.7) implies paleolatitude 28.6 ±7.8°N. For Late Triassic sediments, prefolding components (D=217.3, I=4.5, k=79.6, a95=6.2) indicate a paleolatitude 2.3 ±3.2 °N. Assuming the prefolding direction, isolated in Late Jurassic paleoarc basalts, represent a primary magnetization, only one scenario is possible - studied island-arc basalts were formed on Izanagi plate. This result put very strict geometry constrains on configuration and relative positions of Paleopacific plates in Mesozoic.