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15. The Ailao Shan/Red River metamorphic belt: Tertiary left-lateral shear between Indochina and South China

Author

Wu Haiwei, Zhong Dalai, Liu Xiaohan, Robin Lacassin, Paul Tapponnier, Urs Schärer, Ji Shaocheng, Zhang Lianshang, Philippe Hervé Leloup, and Zhong Jiayou

Subjects
Leucogranite, Lineation, Multidisciplinary, Continental collision, Shear (geology), Absolute dating, Metamorphic rock, Geochemistry, Shear zone, Geology, Mylonite
Abstract

The relative importance of thickening and strike-slip extrusion in continental collision is debated. Ductile shear in the Ailao Shan/Diancang Shan metamorphic belt, along the Red River in Yunnan, China, yields outstanding evidence of the latter process. For > 500 km, mylonites in this narrow northwest-southeast belt show horizontal lineations on steep, northwest-striking foliation planes, and left-lateral kinematic indicators. U–Pb radiometric ages of ∼23 Myr imply that strike-slip movement along this shear zone occurred in the Oligo-Miocene. The strain observed suggests that collision of India with Asia displaced Indochina at least 500km southeastwards relative to South China.

Published
1990

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