Open Access

Table 2

Geodynamic settings.

No Time period Tectonic setting Characteristic assemblages
1 Paleoproterozoic Unknown Gneiss, amphibolite, crystallized schists
2 Cambrian Passive continental margin Quartzite, quartz-sericite schist, greenschist
3 Silurian Active margin subduction (Hornblende-biotite gneiss-granodiorite, gneiss-diorite)
4 Devonian Plate collision Gneissoid two-mica granite, biotite granite
5 Late Paleozoic Active continental margin (Diorite, granodiorite, granite)
6 Early–Middle Triassic Plate collision Biotite granite, two-mica granite
7 Middle Triassic Post-collision rifting Dacite, rhyolite, tuff; granite, granosyenite
8 Early–Middle Jurassic Post-collision intraplate basin Sandstone, siltstone, argillaceous limestone
9 Cretaceous Active continental margin subduction Dacite, rhyolite; granitoid, granite
10 Late Cretaceous Rifting of the upper and magmatic back arc Dacite, felsite, rhyolite, andesite, tuff; biotite granite, two-mica granite
11 Middle Eocene–Oligocene Rifting or pull-apart basin Conglomerate, silty sandstone, silty sandstone, oil-bearing shale
12 early–middle Miocene Thermal subsidence or post-rifting Conglomerate, gravestone, gritstone, sandstone, siltstone, claystone
13 Late Miocene–Quaternary Flood basalt and block doming mixed with inversion, strike-slip faulting, or tectonic extrusion Tholeiitic basalt, sub alkaline, basalt, andesite-basalt, marine sediment
14 Pliocene–Quaternary East Vietnam continental shelf Fluvial-proluvial, fluvial sediments, pebbles, boulders, fluvio-marine sediment, sand, silt, grey clay containing forams, red sand.

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