Permian to Cretaceous granites and felsic volcanics from SW Vietnam and S Cambodia: Implications for tectonic development of Indochina

Zircon ages and geochemistry are presented for igneous rocks from SW Vietnam S Cambodia. Four main age groupings occur: Cretaceous (107–75 Ma), Early Jurassic (195 Late Triassic (230–222 Permian (294–265 Ma). samples amphibole-bearing biotite granodiorites to granites occur mainly east of the Kampot Fold Belt. Pre-Cretaceous within Belt dominantly felsic volcanics. The primarily high-K calc-alkaline, weakly peraluminous rhyolites or granites, with similar arc-like trace element patterns. Dalat Zone Granites formed during Pacific subduction. Two have adakite-like signatures. youngest granite has an A-type signature may represent post-collision activity following cessation also linked could be affiliated similarly aged in Chanthaburi Terrane, Loei related closure Sa Kaeo back arc. We cannot exclude that they Plate Correlation volcanics paleo-Tethys subduction Sukhothai-Chanthaburi arc is not clear as Cambodian older than rocks, there stratigraphic contrasts between Cambodia Chanthaburi. Furthermore, such a correlation requires extension suture into at high angle regional structures. propose Paleo-Pacific shown reconstructions region.