Exhumation history of the Mindoro, Philippine and its implication to mountain building process.

Abstract:

Exhumation history of the Mindoro, Philippine and its implication to mountain building process

Chung-Wei Shiu¹,Yuan-Hsi Lee¹, Reuy-juin Rau², Toto Bacolcol³

1. Department of Earth and Environmental Sciences, National Chung-Cheng university, Taiwan 
2. Department of earth science, National Cheng Kung University, Taiwan 
3. Department of science and technology, Philippine institute of volcanology and seismology 

The Mindoro orogenic belt is result from the collision between the Palawan continental crust and Philippine Mobile zone. In this study we report the zircon fission track ages to identify the timing of rapid exhumation of Mindoro orogenic belt.

The NNW striking East Mindoro fault (EMF) separates the mountain belt and Luzon arc block. The highest mountain reaches to 2500m on hanging wall of the EMF. In the western side of the EMF the mountain belt can be separate into two blocks by NW trending Mindoro suture zone. To the north and south are Mindoro block and north Palawan block, respectively. The Mindoro block is major comprised of unmetamorphic Eocene strata and Mindoro metamorphic complex. The oldest zircon reset fission track ages shows 4-5 Ma in eastern and western side of the Mindoro metamorphic complex which infers the timing of rapid exhumation since ca. 5Ma which indicate the timing of collision between the Palawan block and Luzon arc.