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Journal of the Geological Society; 2007; v. 164; issue.6; p. 1253-1260;
DOI: 10.1144/0016-76492007-065
© 2007 Geological Society of London

Discussion on the role of the Red River shear zone, Yunnan and Vietnam, in the continental extrusion of SE Asia Journal, Vol. 163, 2006, 1025–1036

P.H. Leloup1, P. Tapponnier2, R. Lacassin2 & M.P. Searle3

1 1 CNRS, UMR 5570, Université de Lyon, Université Claud Bernard Lyon1, Ecole Normale Supérieure de Lyon, Laboratoire de Science de la Terre, UMR 5570 CNRS, 2 rue Dubois, Bat géode, la Doua, 69622 Villeurbanne, France (e-mail: herve.leloup{at}univ-lyon1.fr)
2 2 Tectonique et Mécanique de la Lithosphère, Institut de Physique du Globe de Paris, and Université Paris 7, CNRS, Paris, France
3 3 Department of Earth Sciences, Oxford University, Parks Road, Oxford OX1 3PR, UK (e-mail: mike.searle{at}earth.ox.ac.uk)


Figure 1
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  		Fig. 1.  Synthesis of the geochronological data on the Ailao Shan–Red River shear zone compared with the timing proposed for left-lateral slip. (a) Main cooling events in each range of the Ailao Shan–Red River shear zone from Ar/Ar and fission-track (FT) dating. It should be noted that temperature dropped below 250 °C after cooling phases 0 and 1 in all ranges except the Diancang Shan (Leloup et al. 2001). XLS, XueLong Shan; DCS, DianCang Shan; AS, Ailao Shan; FSP, FanSiPang; DNCV, Daynuiconvoi ; LG, LoGam. (b–f) Cumulative probability plots of Th/Pb ages. Left column shows all data; right column is restricted to data from 0 to 70 Ma. (b) Xuelong Shan (XLS), Diancang Shan (DCS) and Ailao Shan (AS) monazite ages in mylonites (Gilley et al. 2003). (c) Daynuiconvoi monazite ages in mylonites (Gilley et al. 2003). (d) Xuelong Shan, Diancang Shan and Ailao Shan U/Pb ages of leucocratic dykes (Schärer et al. 1990, 1994; Zhang & Schärer 1999; Sassier et al. 2006). (e) Ailao Shan U/Pb ages of orthogneiss (Schärer et al. 1994; Zhang & Schärer 1999). (f) Ultrapotassic igneous rocks along the Ailao Shan–Red River shear zone (Chung et al. 1998; Wang et al. 2001). (g) Timing of South China Sea (SCS) sea-floor spreading (Briais et al. 1993; modified according to Cande & Kent 1995) and time interval proposed for left-lateral and right-lateral shear along the Ailao Shan–Red River shear zone.

 

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  		Fig. 2.  Field evidence for leucocratic melts and high temperatures synkinematic to the left-lateral deformation. (a) Syn-left-lateral shear leucocratic dykes; 1 to 3 from older to younger. Modified from Leloup et al. (1993, fig. 12a). (b) Several generations of syn-left-lateral shear leucocratic dykes. Deformation and age decrease with increasing numbers. Modified from Leloup et al. (1993, fig. 12b). (c) Sketch of boudinaged amphibolitic layers with leucocratic melts (stippled pattern) (from Leloup et al. 1995, fig. 14e). (d) Oblique view of outcrop C1 showing several generations of leucocratic dykes, some of which have been dated (Sassier et al. 2006). Less deformed, intermediate and more deformed dykes appear respectively in purple, yellow and orange. (e) Garnets synkinematic to the left-lateral deformation. Top: helicitic garnet, polished rock slab. Bottom: garnet in migmatitic paragneiss; view from above. (f) Migmatitic paragneiss with left-lateral shear planes (from Leloup et al. 1995, fig. 15b). View from above. (g) High-temperature orthogneiss with melted patches around the {alpha} and {delta} type feldspars. Modified from Leloup et al. (1995, fig. 16a). View from above.