North Palawan Block

North Palawan Block is a microcontinental block situated in the western Philippines and the southern tip of the Manila Trench. The North Palawan block is considered to form the northeastern portion of a much larger area of block faulted and foundered pre-Tertiary continental material which extends throughout the southern part of the South China Sea Basin and includes the Spratly Islands and the Dangerous Grounds area off Borneo (Hamilton, 1979). The evidence for the continental composition of the crust of this area is substantial and has been reviewed by Hamilton (1979) and Taylor & Hayes (1980) among others[1].

Puerto Princesa Subterranean River National Park marker describing the geologic history of Palawan

Geology

The geology of the North Palawan Block has four divisions: North Palawan, Romblon Island Group, Northeast Mindoro and Buruanga Peninsula. North Palawan Block has oldest rocks dated Permian period.

Stratigraphic formations of each divisions

North Palawan (Middle Permian – Late Pleistocene)

Romblon Island Group (Early Permian – Late Pliocene)
  • Romblon Metamorphic Complex
  • Carabao Sandstone
  • Pacul Limestone
  • Sibuyan Ophiolitic Complex
  • Tablas Volcanic Complex
  • Calatrava Quartz Diorite
  • Bailan Limestone
  • Binoog Formation
  • Anahao Formation
  • Banton Volcanic Complex
  • Peliw Formation

Northeast Mindoro (Early Jurassic – Late Pleistocene)
  • Halcon Metamorphic Complex
  • Abra de Ilog Formation
  • Lasala Formation
  • Pagbahan Granodiorite
  • Amnay Ophiolite
  • Lumintao Basalt
  • San Teodoro Volcanic Complex
  • Dumali Volcanic Complex

Buruanga Peninsula (Late Jurassic – Late Pleistocene)
  • Buruanga Metamorphic Complex
  • Patria Quartz Diorite
  • Fragante Formation
  • Libertad Formation
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See also

References
  1. Holloway, N (December 1981). "Abstract" (PDF). www.gsm.org.my.
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