Bulletin of the Geological Society of Malaysia, Volume 1, January 1967, pp. 65-79
University of Malaya
Abstract: Sabah (North Borneo) is correlated with the Philippines in a pre-Tertiary arcuate tectogene-geosyncline system. The high grade banded amphibolite gneisses and the banded ultrabasic rocks of both countries are characteristic of and are confined to narrow tectogene zones.
The tectogene system has provided an orthogeosynclinal environment for the deposition of the Cretaceous-Eocene Chert-Spilite Formation, which was, in part, metamorphosed to greenschist facies during the declining revolutionary phase of the tectogene-geosyncline development.
The pre-Chert-Spilite Formation rocks, though. generally of a higher grade of metamorphism, have not acted as a basement, but have acquired the same style of folding as the overlying geosynclinal rocks.
The tectogene system now occupies prominent arcuate geanticlinal welts, forming island arcs, which characterise the western margins of the Pacific Ocean.