Thrust tectonics along the north-western continental margin of Sabah/Borneo

Abstract

ZusammenfassungNach herk6mmlichen plattentektonischen Vorstellungen soll eine inaktive Subduktionszone am nordwesflichen Kontinentalrand von Sabah liegen. Reflexionsseismische Mei~da-ten der BGR zeigen jedoch, daf~ hier autochthone kontinentale Kruste mit einer oligoz~inen-friihmioz~inen Karbonatplattform progressiv yon einem allochthonen Gesteinsverband ikberschoben wird. Fortschreitender Zusammenschub seit dem frfihen Mioz~in fiihrte zur Anlage yon vier Deformationszonen: Tekonische Schuppen (Zone III); zwei iibereinander geschobene Verschuppungssysteme (Zone IV); G~irtel mit mehrphasiger Deformation (Zone V) und Durchspief~ungsstrukturen (Zone VI). AbstractWidely 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: Imbrica'ced 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). R6sum6Les modules g6odynamiques que l'on admet habituellement comportem une zone de subduction inactive le long de la marge continentale nord-occidentaIe de Sabah. Toutefois, des mesures de sismique-r6flexion ex6cut6es par le BGR font apparakre qu'~ cet endroit, une cro~lte continentale autochtone, comportant une plateforme carbonat6e oligoe~ne 6omioc~ne, est chevauch6e progressivement par un complexe allochtone. La compression, qui s'est manifest& progressivement depuis le Miocene inf6rieur, a engendr~ quatre zones structurales: un ensemble d'6cailles tectoniques (zone III); deux syst~mes de lames tectoniques charri6s l'un sur l'autre (zone IV); une zone complexe ~ d6formation rrmltiphas& (zone V); des structures d'extrusion tectonique (zone VI). Karl ~emyr (3oHa 3), ~Ba aa~lBnra qemyfi~aTl, tx C~CTeM apyr Ha ~pyra (3oHa 4) norc c inoro~a3oBofi ~eqbopia-~Hefi (3OHa 5) H ~iamq3om,ie cTpyKTypl, I (3oHa 6).

Oligocene–Miocene carbonates in the Reed Bank area, South China Sea, and their tectono-sedimentary evolution

“…1b for locations). In addition, we incorporated published stratigraphic schemes from the study area (Hinz and Schlueter 1985;Hinz et al 1989;Clift et al 2008;Franke et al 2008Franke et al , 2013Cullen et al 2010;Hutchison and Vijayan 2010;Yao et al 2012;Ding et al 2011). In the Fig.…”

Coupled onshore erosion and offshore sediment loading as causes of lower crust flow on the margins of South China Sea

“…Furthermore, rifting was terminated during active propagation as result of the collision of the southern Dangerous Grounds margin with Borneo (Hutchison et al 2000;Clift et al 2008;Hinz et al 1989). This basin was formed as a result of extension starting in the Late Cretaceous and accelerating during the Eocene, culminating in breakup and the onset of seafloor spreading likely around 30 Ma, at least offshore of southern China (Su et al 1989;Briais et al 1993;Ru and Pigott 1986;Franke et al 2014;Barckhausen et al 2014).…”

Neogene Tectonic Evolution of the Celebes-Sulu Basins: New Insights from Leg 124 Drilling

“…2). This collision complex extends southwestward to Sabah (northeast Borneo), where it is presently overthrusting northward onto the Dangerous Grounds platform (DG), a lateral equivalent of Reed Bank (RB) (Hinz et al, 1989;Rangin, 1989 …”