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