Geology and tectonic evolution of Palawan – northern Borneo region
The island of Palawan, the most westerly island of the Philippine Archipelago, lies approximately 400 km to the northeast of northern Borneo along the southern margin of the South China Sea. On a broad scale these two areas — northern Borneo and Palawan — share many geological and physiographic characteristics.
These shared geological and physiographic characteristics result from a common tectonic history that is linked to the opening of the South China Sea during the Early Cenozoic. Tectonic activity in northern Borneo culminated in the Early Miocene Sabah Orogeny, when continental fragments rifted from the South China margin and collided with the existing land mass. A similar scenario has been proposed for Palawan – material rifted from the South China margin is suggested to have collided with the Cagayan Ridge Arc in the Middle Miocene.Northern Borneo is known to have experienced significant uplift and erosion during the Miocene and Pliocene. It is suggested that this event is of regional significance, and that widespread uplift and erosion at this time created a large emergent landmass that encompassed both northern Borneo and Palawan.
- Age, origin and thermal history of the Capoas intrusion, Palawan
- Provenance of Palawan sandstones and sediment sources to northern Borneo