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The Triassic in Thailand

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Zusammenfassung

Die zwischen Perm und Jura in Thailand auftretenden tektonischen Bewegungen („Indosinische Orogenese“) führten zur Bildung von Hebungs- und Senkungsgebieten, die die Paläogeographie in der Trias beherrschten. Die starken orogenen Bewegungen im Nor führten zu einer Umgestaltung der paläogeographischen Verhältnisse.

Die beiden während der Trias auftretenden Sedimentationszyklen bestehen aus einer marinen Faziesentwicklung vom Skyth bis zum unteren Nor und einer terrestrischen vom oberen Nor bis zum Rhät/Lias.

Die fazielle und strukturelle Entwicklung der Triassedimente sowie die Intrusion bzw. Effusion von Eruptivgesteinen sind auf die seit dem Karbon erfolgende Subduktion ozeanischer Kruste und die Kollision der Eurasiatischen Platte mit der Indochinesischen Platte im Nor zurückzuführen.

Abstract

The tectonic movements which occurred in Thailand between the Permian and the Jurassic (“Indosinian Orogeny”) caused the uplifting and subsidence of areas which were dominant paleogeographic features during the Triassic. The strong orogenic movements during the Norian caused an alteration of the paleogeographic conditions.

The two sedimentation cycles of the Triassic comprised a marine facies development from the Skythian to the early Norian and a terrestrial one from the later Norian to the Rhaetian/Liassic.

The development of the facies and structure of the Triassic sediments, as well as the intrusion and effusion of igneous rocks, are due to the subduction of oceanic crust beginning in the Carboniferous and to the collision of the Eurasian with the Indochina Plate during the Norian.

Résumé

Les mouvements tectoniques («Orogenèse Indosinienne») intervenus entre le Permien et le Trias en Thaïlande se sont traduits en soulèvements et affaissements qui ont dominé la paléogéographie du Trias. Les forts mouvements orogéniques du Norien ont conduit à transformer les rapports paléogéographiques.

Les deux cycles sédimentaires du Trias consistent dans le développement d'un faciès marin du Scythien au Norien inférieur, et d'un faciès continental du Norien supérieur au Rhétien/Lias. L'évolution du faciès et de la structure des sédiments du Trias, l'intrusion et l'effusion des roches ignées sont attribuées à la subduction de la croute océanique consécutive au Carbonifère, et à la collision de la «Plaque Euroasiatique» avec la «Plaque Indochinoise» au Norien.

Краткое содержание

Тектонические движе ния — „Индокитайский орогенез“ — в период м ежду Пермью и юрой в Таилан де привели к образова нию регионов поднятия и о пускания, которые оказали силь ное влияние на палеог еографию триаса. Мощные горообразовательны е движения в норийско м веке привели к преобразов анию палеогеографически х взаимоотношений.

Оба оседконакопител ьных цикла во время тр иаса состоят от скифского яруса до нижне-норийс кого из морских отлож ений, а от верхнего норийского до рэтского-лайосово го ярусов — из контине нтальных отложений.

Фациальное и структу рное развитие осадоч ных пород триаса, как и интрузии, или эффузии эруптивных пород раз вивалось под влиянием засасыв ания океанической коры, на чавшейся после карбо на, и коллизии евроазиатс кой глыбы с индокитайско й в нориском веке.

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Hahn, L. The Triassic in Thailand. Geol Rundsch 71, 1041–1056 (1982). https://doi.org/10.1007/BF01821117

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