NorLombok

Malaysia Offshore

Brunei Offshore

This geological cross-section through the Brunei onshore/offshore, a Mio-Pliocene delta building (stacking of progradational deltas) is developed in the forearc area, which overlies a Paleogene accretionary complex. The plunging lithospheric plate is composed by a basement or a substratum Paleozoic on which a Paleogene/Neogene backarc basin and a Oligocene-Recent non Atlantic-type divergent margin developed before the collision. Later, during the collision, the southern part of non Atlantic-type divergent margin and, probably, the backarc basin were incorporated and shortened in the accretionary wedge developed in of the overriding lithospheric plate.

On this Canvas autotrace, the Neogene progradational delta building is recognized. It was developed in a forearc basin, which overlies the accretionary wedge of the overriding lithospheric plate of the subduction zone bounding the NW Borneo trough (see Page 14). Take a look to the tentative geological interpretation of a perpendicular Canvas autotrace, proposed on Page 33, to see the tectonic behavior of the plunging lithospheric plate under deeper depth water.