Zusammenfassung
Nach herkömmlichen plattentektonischen Vorstellungen soll eine inaktive Subduktionszone am nordwestlichen Kontinentalrand von Sabah liegen. Reflexionsseismische Meßdaten der BGR zeigen jedoch, daß hier autochthone kontinentale Kruste mit einer oligozänen-frühmiozänen Karbonatplattform progressiv von einem allochthonen Gesteinsverband überschoben wird. Fortschreitender Zusammenschub seit dem frühen Miozän führte zur Anlage von vier Deformationszonen: Tekonische Schuppen (Zone III); zwei übereinander geschobene Verschuppungssysteme (Zone IV); Gürtel mit mehrphasiger Deformation (Zone V) und Durchspießungsstrukturen (Zone VI).
Abstract
Widely accepted plate tectonic models suggest that an inactive subduction zone lies along the north-west continental margin of Sabah. In contrast, interpretation of reflection seismic data acquired by BGR shows an autochthonous continental terrane comprising an Oligocene to Early Miocene carbonate platform being progressively overthrust by an allochthonous rock complex. Progressive compression resulted in the development of four structural zones: Imbricated thrust sheets (Zone III); two thrust sheet systems one on top of the other (Zone IV); a complex zone with multiphase deformation (Zone V); and piercement ridges (Zone VI).
Résumé
Les modèles géodynamiques que l'on admet habituellement comportent une zone de subduction inactive le long de la marge continentale nord-occidentale de Sabah. Toutefois, des mesures de sismique-réflexion exécutées par le BGR font apparaître qu'à cet endroit, une croûte continentale autochtone, comportant une plateforme carbonatée oligocène à éomiocène, est chevauchée progressivement par un complexe allochtone. La compression, qui s'est manifestée progressivement depuis le Miocène inférieur, a engendré quatre zones structurales: un ensemble d'écailles tectoniques (zone III); deux systèmes de lames tectoniques charriés l'un sur l'autre (zone IV); une zone complexe à déformation multiphasée (zone V); des structures d'extrusion tectonique (zone VI).
Краткое содержание
По принятым представ лениям теории тектон ики плит, неактивная зона засасывания располо жена на северо-западном крае материка у Sabah'a. Но данные сейсмических исслед ований указывают на т о, что здесь аллохтонные по роды постепенно надв игаются на автохтонную матер иковую кору с карбона тной платформой олиго-ран немиоценового возра ста. Начиная с раннего миоцена про грессирующая коллиз ия привела к появлению 4-? з он деформации: тектон ическая чешуя (зона 3), два надви га чешуйчатых систем друг на друга (зона 4) по яс с многофазовой деф ормацией (зона 5) и диапировые стр уктуры (зона 6).
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Hinz, K., Fritsch, J., Kempter, E.H.K. et al. Thrust tectonics along the north-western continental margin of Sabah/Borneo. Geol Rundsch 78, 705–730 (1989). https://doi.org/10.1007/BF01829317
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DOI: https://doi.org/10.1007/BF01829317