New paleomagnetic results of upper Permian - lower Triassic volcanic sequences from the Hoa Binh area, northwest Vietnam

• Published in: VIETNAM JOURNAL OF EARTH SCIENCES
• Main Authors: Chi, Cung Thuong, Geissman, John W., Quy, Hoang Van, Dung, Nguyen Thi Phuong, Hoc, Nguyen Thi
• Format: Article in Journal/Newspaper
• Language: English
• Published: Publishing House for Science and Technology 2014
• Subjects: Arlington; Blundell; Fang; Gauthier; Holloway; Kononov; McKerrow; Metcalfe; Petrova; Ulmer; Geomagnetic Pole
• Online Access: http://vjs.ac.vn/index.php/jse/article/view/6429; https://doi.org/10.15625/0866-7187/36/4/6429

Oriented-core samples (125) from twelve sites collected from the Late Permian-Early Triassic volcanic Vien Nam formation exposed at the Hoa Binh Dam area, northwest Vietnam yield interpretable magnetizations in progressive demagnetization. The characteristic remanent magnetization (ChRM) components carried by magnetite and hematite are successfully isolated from secondary components and reveal a mean, in situ (geographic coordinates) paleomagnetic direction of Decl. = 33.8o, Incl. = -28.4o (a95= 9.5o, k = 30.3, N = 9 site mean directions), corresponding to a virtual geomagnetic pole located at l = 41.1 oN, f = 239.8 oE and a paleo-latitude for the study area situated at ~15 oS during the Late Permian to Early Triassic. A comparison of the pole we report in this study with the Late Permian-Early Triassic part of the South China Block apparent polar wander path shows that this volcanic terrane of northwest Vietnam has been close to if not a coherent part of the South China Block since the Late Permian. This result implies that insignificant cumulative displacement has occurred along the Ailao Shan/Red River fault system during the Cenozoic India-Eurasia collision.References Achache, J., Courtillot, V., 1985: A preliminary Upper Triassic paleomagnetic pole for the Khorat Plateau (Thailand): Consequences for the accretion of Indochina against Eurasia.Earth Planet. Sci. Lett., 73, 147-157. Cai, J.-X., Zhang, K.J., 2009: A new model for the Indochina and South China collision during the Late Permian to the Middle Triassic. Tectonophysics 467, 35-43. Chan, L.S., Wang, C.Y., Wu, X.Y., 1984: Paleomagnetic results from some Permian-Triassic rocks from southwestern China. Geophys. Res. 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