The Devonian vertebrates (Placodermi, Sarcopterygii) from Central Vietnam and their bearing on the Devonian palaeogeography of Southeast Asia

Palaeoenvironmental implications of geochemistry and radiolarians from Upper Devonian chert/shale sequences of the Truong Son fold belt, Laos

“…Plot of NASC-normalized Ce/Ce* against Eu/Eu* of the Upper Devonian chert/siliceous shale sequences in this study (VR, PS) and those reported from South China (SW, BSI and FSI) (Chen et al, 2006), NE Thailand (CK, SN and PSY) and N Thailand (CD) (Hara et al, 2010). continental margin (e.g. Janvier et al, 1997;Lepvrier et al, 2008). If amalgamation of Indochina and South China took place before the Devonian (e.g.…”

The South China block-Indochina collision: Where, when, and how?

“…These formations were deposited in a passive continental margin (Tran and Vu, 2011;Thanh et al, 2012). Since the faunal assemblages show close affinities with Devonian fossils of Yunnan and Guangxi provinces of S. China, it has been argued that SCB and Indochina were welded together in the Devonian (Janvier et al, 1989(Janvier et al, , 1996(Janvier et al, , 1997Than et al, 1996;Racheboeuf et al, 2005Racheboeuf et al, , 2006. More precisely, Middle Devonian (Emsian) to Late Devonian (Frasnian) terrigenous formations, yielding endemic placoderm fish fossils have been reported in each of the three tectonic domains discussed here, namely: i) in the Outer zone NE Vietnam belt, (Do Son formation, near Hai Phong); ii) South of the Black River (i. e. Song Da), in the Po Sen-Hoa Binh zone, and iii) South of the Song Ma suture, near cape Ly Hoa, in the southeastern extension of the Sam Nua zone (Janvier et al, 1989(Janvier et al, , 1996(Janvier et al, , 1997Than et al, 1996;Racheboeuf et al, 2005Racheboeuf et al, , 2006.…”

Zircon U–Pb ages and geochemistry of granitoids in the Truong Son terrane, Vietnam: Tectonic and metallogenic implications

“…9. Primitive mantle-normalized multi-element patterns for the granitoids from the Truong Son terrane (normalization values are from Sun and McDonough, 1989). stone and sandy shale intercalated andesites (typical of active continental margin) during Ordovician-Silurian, an successive marine shale and limestone from Silurian to Devonian and siltstone, sandstone, coal-bearing shale, chert and clayish limestone in the Early Carboniferous, as well as biogeographical isolation during the Early-Middle Devonian (Janvier et al, 1997) and biotic consistency during the Late Devonian (Tong and Janvier, 1996) with the South China block. Similar Early Carboniferous flora also documented both in Central Thailand, Loei (Visean, ca 340 Ma) and South China (Metcalfe, 2013).…”

“…It is commonly accepted that the Song Ma suture represents the plate boundary between Indochina and South China block (Metcalfe, 1996a;Lepvrier et al, 1997Lepvrier et al, , 2004Lepvrier et al, , 2008Wang et al, 2000;Hoa et al, 2008;Liu et al, 2012;Roger et al, 2014;Faure et al, 2014). The Song Ma suture extends NW-trend into the Jinshajiang -Ailaoshan suture, and is considered to be a branch ocean of the eastern Paleo-Tethyan which opened in Devonian (Janvier et al, 1997) or Carboniferous (Metcalfe, 1996b;Carter et al, 2001) and began to subduct during Late Permian to Early Triassic (Hutchison, 1989;Lepvrier et al, 1997Lepvrier et al, , 2004Lepvrier et al, , 2008Chung et al, 1997;Hoa et al, 2008) and closed in the Middle Triassic (Faure et al, 2014). For the southern boundary, the Tamky-Phuoc Son suture (or shear zone), is considered as a Paleo-ocean separated the Truong Son terrane from Kontum terrane (Tran, 1979;Quynh et al, 2004;Lepvrier et al, 2004Lepvrier et al, , 2008Tran et al, 2014) or just a product of Indosinian orogeny (Gatinsky and Hutchison, 1987).…”