Mount Natib

Mount Natib
Mount Natib
	Mt. Natib as viewed from WSW
Highest point
Elevation	1,253 m (4,111 ft)
Listing	Potentially active volcano
Coordinates	14°43′N 120°24′E / 14.72°N 120.40°E
Geography
	Mount Natib Location within the Philippines
Location	Bataan Peninsula, Luzon
Country	Philippines
Region	Central Luzon
Province	Bataan
Parent range	Zambales Mountains
Geology
Age of rock	Pliocene to Pleistocene
Mountain type	Stratovolcano-Caldera
Volcanic arc/belt	Luzon Volcanic Arc
Last eruption	Unknown, est. upper Pleistocene to Holocene

Mount Natib /nɑːˈtiːb/ is a dormant stratovolcano and caldera complex in the province of Bataan on western Luzon Island of the Philippines. The volcano complex occupies the northern portion of the Bataan Peninsula. The mountain and adjacent surrounding is a protected area first declared as the Bataan National Park in 1945.^[2]^[3]

Physical features

Mount Natib is a stratovolcano type of volcano topped by a 6-by-7-kilometre (3.7 by 4.3 mi) acorn-shaped Natib Caldera that is open to the northwest. East of its caldera is the smaller 2-kilometre (1.2 mi) wide Pasukulan Caldera.^[3] The highest peak of Mount Natib has an elevation of 1,253 metres (4,111 ft) asl and is at the point of convergence of the two calderas. The caldera complex has an overall base diameter of 26 kilometres (16 mi).^[4]

Volcanic activity

There are no historical eruptions within the Natib caldera complex. Studies in 1991 (Panum and Rayem) indicate that the last eruptive activity was probably Holocene to upper Pleistocene.^[1] An earlier study in 1971 (Ebasco Services) dated the eruptive products between 69,000 +/- 27,000 years old.^[1] A recent study by Dr. Kevin Rodolfo of the Department of Earth and Environmental Sciences at the University of Illinois at Chicago, had Mount Natib's latest eruption between 11,000 and 18,000 years ago after studying a prehistoric pyroclastic flow from the volcano that entered Subic Bay in Zambales province.^[5] Current activity on Natib is through five thermal areas. The hot springs in the Natib caldera are Asin,^[1] Mamot, Tigulangin, Uyong, and Paipit springs. The hot springs have temperatures ranging from 30-56 °C, with low flows, and a neutral to slightly alkaline water discharge.^[4]

The Philippine Institute of Volcanology and Seismology (PHIVOLCS) lists Mount Natib as a potentially active volcano.^[4]

Geology

The rocks found on Natib are predominantly biotite, hornblende, andesite, trending to dacite flows and dacitic tuffs, which are similar to Mount Mariveles, the southern half of the Bataan Peninsula.^[4]^[6]

Natib is part of the Western Bataan Lineament volcanic belt, which includes the active Mount Pinatubo.^[7]

References

^ ^a ^b ^c ^d ^e ^f "Natib". Global Volcanism Program. Smithsonian Institution. Retrieved 2008-12-02.
^ "Protected Areas in Region 3". Protected Areas and Wildlife Bureau of the Philippines. Retrieved on 2012-02-21.
^ ^a ^b Mt. Natib" Archived 2011-02-04 at the Wayback Machine. Bataan...Raging Peninsula. Retrieved on 2012-02-21.
^ ^a ^b ^c ^d "Natib" Archived 2011-10-05 at the Wayback Machine. Philippine Institute of Volcanology and Seismology. Retrieved on 2012-02-21.
^ Cherry (2012-02-03). "Preserve Mt. Natib of Bataan". MyBataan.com. Retrieved on 2012-02-21.
^ "Mariveles" Archived 2011-10-05 at the Wayback Machine. Philippine Institute of Volcanology and Seismology. Retrieved on 2012-02-21.
^ "Pinatubo Volcano" Archived 2009-01-29 at the Wayback Machine. Philippine Institute of Volcanology and Seismology. Retrieved on 2012-02-21.