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

HR: 0800h
AN: GP41A-0827 [Abstracts]
TI: Paleomagnetic results from accretional complexes of Taigonos peninsula and their paleotectonic application.
AU: Morozov, O
EM: odin@ginras.ru
AF: Geological Institute, Russian Academy of Sciences, Pyzhevsky per. 7, Moscow, 119017 Russian Federation
AU: * Alexyutin, M
EM: maxalex@geophysik.uni-muenchen.de
AF: Geological Institute, Russian Academy of Sciences, Pyzhevsky per. 7, Moscow, 119017 Russian Federation
AU: * Alexyutin, M
EM: maxalex@geophysik.uni-muenchen.de
AF: Ludwig-Maximilians-Universit„t Mnchen Department of Earth and Environmental Sciences Geophysics Section , Theresienstrasse, 41 , Mnchen, 80333 Germany AU: Sokolov, S
EM: sdsokolov@ginras
AF: Geological Institute, Russian Academy of Sciences, Pyzhevsky per. 7, Moscow, 119017 Russian Federation
AU: Harbert, W
EM: harbert@pitt.edu
AF: Department of Geology and Planetary Science, University of Pittsburgh, 200 SRCC Building 4107 O'Hara Street, Pittsburgh, 15260-3332 United States
AB: 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 ñ7.8øN. For Late Triassic sediments, prefolding components (D=217.3, I=4.5, k=79.6, a95=6.2) indicate a paleolatitude 2.3 ñ3.2 øN. 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.
DE: 1525 Paleomagnetism applied to tectonics (regional, global)
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2004 AGU Fall Meeting