Geochemistry and zircon U–Pb ages and Hf isotopic composition of Permian alkali granitoids of the Phan Si Pan zone in northwestern Vietnam

Neoproterozoic subduction along the Ailaoshan zone, South China: Geochronological and geochemical evidence from amphibolite

“…1 and 12), with gabbro and granodiorite yielding U-Pb zircon ages of 769 ± 7 Ma and 761 ± 11 Ma and their geochemical composition suggesting a magmatic arc setting (e.g., Qi et al, 2012). Additionally, in the PoSen complex in northern Vietnam, which is inferred to lie along a further extension of the Ailaoshan suture zone (Hieu et al, 2009(Hieu et al, , 2012 Hieu et al, 2009Hieu et al, , 2012Lin et al, 2012;Liu et al, 2012;Wang et al, 2011a). The synthesis of all data suggests an overall age-range of the Neoproterozoic igneous activity within the Ailaoshan suture zone from at least 815 Ma to 750 Ma.…”

Petrogenesis and zircon U–Pb ages of the Thien Ke granitic pluton in the Tam Dao region: Implications for early Paleozoic tectonic evolution in NE Vietnam

“…The magmatic rocks are mainly distributed in the central and NE parts of the study area and were formally divided into the Pia Oac (Da Lien and Thien Ke plutons) and Nui Dieng (Nui Dieng and Nui Phao plutons) complexes, which were considered to be products of the Yanshanian and Indosinian tectonothermal events, respectively. In northern Vietnam, evidence of Mesozoic magmatism was reported by many geologists (e.g., Anh et al, 2002;Lepvrier et al, 2008;Nakano et al, 2008Nakano et al, , 2010Hieu et al, 2013;Thuy and Chung 2013), but Caledonian igneous activity has not yet been recognized. In recent years, some Caledonian granites were reported in the Song Chay area, NE Vietnam (e.g., Roger et al, 2000;Yan et al, 2006), in NW Vietnam (Nguyen et al, 2005) and in central Vietnam (Nagy et al, 2001;Nakano et al, 2013).…”

“…East and Southeast Asia comprise different terrains and blocks, which were derived from the northern margin of Gondwanaland (Leloup et al, 1995(Leloup et al, , 2001Findlay, 1997, Findlay andTrinh, 1997;Nam, 1998;Fan and Chen, 2000;Carter et al, 2001;Golonka et al, 2006;Hieu et al, 2012Hieu et al, , 2013. Successive rifting and breakup of Gondwanaland formed several continental blocks during Paleozoic and Mesozoic times.…”

Late Miocene provenance change on the eastern margin of the Yinggehai-Song Hong Basin, South China Sea: Evidence from U–Pb dating and Hf isotope analyses of detrital zircons

“…The age ranges are ubiquitous and similar in these tectonic units, thus they are difficult to distinguish by UePb ages. Indosinian zircon grains extracted from sand of the modern Red River and granites in the southern Yangtze have a wide range of ε Hf (t) values of À20 to þ15 with model ages between 2200 and 440 Ma (Hoang et al, 2009;Hiếu et al, 2013 (Wen, 2013;Wen et al, 2013). The Indosinian ages in sample L262-1 gave ε Hf (t) values at À27.91 to À7.76 ( Fig.…”