New Permo-Carboniferous geochemical data from central Thailand: implication for a volcanic arc model

Current ideas and models of geotectonic reconstructions of Southeast Asia are reviewed and new data on Late Carboniferous through Middle Permian tuffites and sills from central Thailand are presented in the light of the problems of Southeast Asian palaeogeography. The volcanic rocks of quartz-keratophyric to spilitic composition are associated with platform carbonates and deep basin sediments. Their geochemistry and the character of the accompanying sediments suggest the existence of a Late Palaeozoic volcanic arc separating a subduction zone in the west from a back arc basin to the east. The geotectonic frame of Southeast Asia is explained in terms of repeated accretion of volcanic arcs by the Late Palaeozoic subduction zone along the northern Tethys margin

Permian fusulinacean faunas of Thailand — event controlled evolution

The evolution of the fusulinacean faunas of Thailand during Permian times is controlled by bioevents. The first bioevent happened in the upper Lower Permian and is characterized by the disappearance of the Arctic-Tethyan elements. This bioevent can be correlated with the closure of the Urals and a worldwide regression. The second bioevent happened at the boundary Middle/Upper Permian to lower Upper Permian (Midian). It is characterized by the extinction of approximately 90 % of the fusulinaceans. This bioevent is controlled by the orogenic evolution of the Kunlun and the Petchabun fold and thrust belt, which again led to a worldwide regression. The third bioevent happened at the boundary Permian/Triassic. It is characterized by the final extinction of the fusulinaceans and might be controlled by the isostatic uplift of the newly formed mountain belt

The lower jaw of Sunosuchus thailandicus, a mesosuchian crocodilian from the Jurassic of Thailand

Volume: 27Start Page: 199End Page: 20

Découverte d'une faune d'âge Pléistocène moyen terminal (Loangien) dans le nord de la Thailande

International audienc