Paleomagnetism of upper permian basaltic rocks of Cam Thuy formation from Thuan Chau locality, Son La, Northwest Vietnam

Cung Thuong Chi, John W. Geissman, Hoang Van Quy, Tran Viet Anh, Nguyen Thi Phuong Dung

Abstract


Oriented-core samples (74) from eight sites collected from the Late Permian basaltic Cam Thuy formation exposed at Thuan Chau locality, Son La Province, northwestern Vietnam yield interpretable magnetizations in progressive demagnetization. The characteristic remanent magnetization (ChRM) components carried by magnetite and hematite are successfully isolated from secondary components reveal a mean, stratigraphic coordinates paleomagnetic direction of Ds = 216.1o, Is = 10.5o95 = 8.9o, k = 107.8, N = 7 site mean directions), corresponding to a virtual geomagnetic pole located at λ = 45.6 oN, f = 226.8 oE and a paleo-latitude for the study area situated at ±5.3 oN during the Late Permian. A comparison of the pole we report in this study with the Late Permian pole of South China Block shows that this basaltic terrane of northwest Vietnam has been close to if not a coherent part of the South China Block since 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.

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