@Article{McDermid:2002, author = {I.R.C. McDermid and J.C. Aitchison and A.M. Davis and T.M. Harrison and M. Grove}, title={The {Z}edong terrane: A {L}ate {J}urassic intra-oceanic magmatic arc within the {Y}arlung-{Z}angbo suture zone, southeastern {T}ibet}, journal={Chem. Geol.}, year={2002}, volume={187}, number={}, month={Aug}, pages={267--277}, note={}, annote={}, keywords={Tethys; Yarlung-Tsangpo suture zone; Island arc; Zedong terrane; Jurassic; Geochronology}, url={http://sims.ess.ucla.edu/PDF/Mcdermid_et_al_ChemGeol_2002.pdf}, doi={10.1016/S0009-2541(02)00040-2}, abstract={An overturned sequence of igneous and volcaniclastic rocks crops out along the Yarlung-Tsangpo suture zone (YTSZ), in southeastern Tibet. These rocks are remnants of an intra-oceanic island arc, the Zedong terrane, that once lay between India and Asia. $^{40}$Ar/$^{39}$Ar dating and U-Pb ion microprobe analyses reported here reveal that this arc was active during the Jurassic. U-Pb dating of zircon from a dacite breccia from the middle portion of the Zedong terrane, yields an age of 161$\pm$2.3 Ma (1$\sigma$). $^{40}$Ar/$^{39}$Ar dating of hornblende from a cross-cutting andesite dyke yields the youngest age of 152.2$\pm$3.3 Ma (1$\sigma$). $^{40}$Ar/$^{39}$Ar results from hornblende from andesite dykes and an andesite breccia from the upper portion yield a mean age of 156$\pm$0.3 Ma (1$\sigma$). Additional U-Pb and $^{40}$Ar/$^{39}$Ar dating of zircon and hornblende from quartz diorite yields a mean age of 156.8$\pm$0.8 Ma (1$\sigma$). Geochronological data reported here and other published work indicate that the intra-oceanic subduction system to which the Zedong terrane belonged was active from at least Late Jurassic to Early to mid Cretaceous.} }