Timing of left-lateral shearing along the Ailao Shan-Red River shear zone: constraints from zircon U–Pb ages from granitic rocks in the shear zone along the Ailao Shan Range, Western Yunnan, China

Contrasting exhumation histories along a crustal-scale strike-slip fault zone: The Eocene to Miocene Ailao Shan-Red River shear zone in southeastern Tibet

“…The ages of these dykes have been used to constrain the timing of the initiation of shearing to ca. 28 Ma and the duration of shearing to between 28 and 21 Ma (Searle, 2006;Searle et al, 2010;Cao et al, 2011a;Tang et al, 2013;Liu et al, 2015). However, the ages of emplacement of the dykes generally decrease from southeast to northwest (Liu et al, 2015).…”

“…The peak metamorphic grades are upper amphibolite to granulite facies (Wang et al, 2013). Migmatization is widely developed in the high-grade metamorphic core and resulted in several migmatites (Tang et al, 2013). The Paleozoic-Mesozoic low-grade metamorphic belt consists of upper to lower greenschist-facies metamorphic rocks, e.g., mica schists, garnet mica schists and phyllites (Leloup et al, 1995).…”

“…Cenozoic intrusions are generally small or occur as leucocratic dykes, except at the southern end of the ALS massif at the China-Vietnam border where the late Eocene to early Oligocene Fan Si Pan granite forms a large plutonic intrusion (e.g., Leloup et al, 2001Leloup et al, , 2007Tran et al, 2014). The leucocratic dykes can be grouped into pre-, syn-and post-shearing dykes on the basis of structural and microstructural criteria (Searle et al, 2010;Cao et al, 2011a;Tang et al, 2013). These three dyke types have been dated to >30 Ma, 28-21 Ma, and 24-21 Ma, respectively.…”

“…The exhumation histories of these massifs and their relationships to the regional tectonics are important to understand both the nature of crustal fault zones and the evolution of the collision (Wang et al, 1998;Schoenbohm et al, 2005;Cao et al, 2011b). The timing of the left-lateral shear and exhumation associated with the four massifs, and their tectonic implications have therefore been the focus of many recent studies (Leloup and Kienast, 1993;Schärer et al, 1994;Leloup et al, 1995Leloup et al, , 2001Harrison et al, 1996;Chung et al, 1997;Wang et al, 1998;Zhang and Schärer, 1999;Searle, 2006;Searle et al, 2010;Tang et al, 2013;Liu et al, 2015).…”

Zircon U–Pb ages, Hf isotope data, and tectonic implications of Early–Middle Triassic granitoids in the Ailaoshan high-grade metamorphic belt of Southeast Tibet

“…The age of sinistral shearing ( Fig. 3b) is constrained by the emplacement ages of syn-kinematic leucogranites (31.9-24.2 Ma; Leloup et al 1995;Searle et al 2010;Tang et al 2013;Liu et al 2015b). There are also numerous small-scale mafic-ultramafic intrusions within the high-grade metamorphic belt (Figs.…”