Petrology and zircon U–Pb geochronology of pelitic gneisses and granitoids from the Dai Loc Complex in the Truong Son Belt, Vietnam: Implication for the Silurian magmatic-metamorphic event

P–T–t conditions of Early Palaeozoic low‐P high‐T granulite facies metamorphism in the southern Truong Son Belt, Central Vietnam

“…Geochronological data from the Truong Son Belt and Kontum Massif reveal two major tectonothermal events during the Ordovician-Silurian and Permian-Triassic periods. Different interpretations have been proposed for the Ordovician-Silurian tectonothermal events, including (1) extension within the Gondwana supercontinent (Burrett et al, 2021;Carter et al, 2001); (2) collision between the Indochina and South China blocks (Usuki et al, 2009); (3) subduction and subsequent collision between the Truong Son Belt and Kontum Massif along the TKPS suture zone (Faure et al, 2018;Gardner et al, 2017;Jiang et al, 2020;Tran et al, 2014;Wang et al, 2020); (4) arc-related magmatism (Nagy et al, 2001;Nakano et al, 2013Nakano et al, , 2021Vuong et al, 2022); and (5) an intra-continental thermal event (Maluski et al, 2005). The Permian-Triassic event is generally considered to have resulted from the subduction of the Song Ma Palaeo-Tethys Ocean beneath the Indochina Block or South China Block and the consequent collision of the Indochina and South China blocks, namely, the Indosinian Orogeny (Faure et al, 2014;Liu et al, 2013;Nakano et al, 2010;Zhang et al, 2013Zhang et al, , 2014.…”

“…The reported U-Pb zircon ages F I G U R E 2 Geological map of the Dai Loc shear zone with sample localities. Zircon U-Pb ages and mica Ar-Ar/K-Ar ages are from previous studies (Carter et al, 2001;Hieu et al, 2016;Jiang et al, 2020;Lepvrier et al, 1997;Nam, 1998;Vuong et al, 2022).…”

“…The Early Palaeozoic configuration of the Indochina Block has recently attracted significant attention because of the unresolved nature of its tectonic evolution. It remains unclear whether subduction and consequent collision occurred during the Early Palaeozoic or if subduction occurred alone (Faure et al, 2018;Gardner et al, 2017;Jiang et al, 2020;Nagy et al, 2001;Nakano et al, 2013Nakano et al, , 2021Nguyen et al, 2019;Shi et al, 2015;Tran et al, 2014;Tri et al, 2020;Usuki et al, 2009;Vuong et al, 2020Vuong et al, , 2022Wang et al, 2020Wang et al, , 2021Wang, Mo, et al, 2016). Early Palaeozoic rocks are widespread in the Kontum Massif and Truong Son Belt, which are two major tectonic units in the eastern part of the Indochina Block.…”

“…Early Palaeozoic rocks are widespread in the Kontum Massif and Truong Son Belt, which are two major tectonic units in the eastern part of the Indochina Block. Very few studies have been performed on metamorphic rocks, particularly in the Truong Son Belt (Vuong et al, 2022). LPHT metamorphic rocks cropping out along the SE-NW-to E-W-trending shear zones in the Truong Son Belt have been recognized in previous studies (Lepvrier et al, 1997(Lepvrier et al, , 2004(Lepvrier et al, , 2008Vuong et al, 2022).…”

“…Very few studies have been performed on metamorphic rocks, particularly in the Truong Son Belt (Vuong et al, 2022). LPHT metamorphic rocks cropping out along the SE-NW-to E-W-trending shear zones in the Truong Son Belt have been recognized in previous studies (Lepvrier et al, 1997(Lepvrier et al, , 2004(Lepvrier et al, , 2008Vuong et al, 2022). However, the metamorphic P-T evolution of these metamorphic rocks has not yet been thoroughly investigated.…”