Natib
Encyclopedia
Natib is a thermal
stratovolcano
in the Philippines
.
Natib is located in the province
of Bataan
, in region
III, on western Luzon
Island, in the Philippines. It is partially in Bataan National Park.
, and base diameter of 26 km.
Phivolcs records Natib as thermal: hotsprings Mamot, Tigulangin, Uyong and Paipit springs within Natib caldera have temperatures ranging from 30-56°C, low flows, and discharge neutral to slightly alkaline water.
to upper Pleistocene
, about 70,000 years ago. There have been no historical eruptions.
hornblende
andesite
trending to dacite
flows and dacitic tuffs.
Tectonically, Natib is on the Western Bataan Lineament.
Thermal
A thermal column is a column of rising air in the lower altitudes of the Earth's atmosphere. Thermals are created by the uneven heating of the Earth's surface from solar radiation, and are an example of convection. The sun warms the ground, which in turn warms the air directly above it...
stratovolcano
Stratovolcano
A stratovolcano, also known as a composite volcano, is a tall, conical volcano built up by many layers of hardened lava, tephra, pumice, and volcanic ash. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile and periodic, explosive eruptions...
in the Philippines
Philippines
The Philippines , officially known as the Republic of the Philippines , is a country in Southeast Asia in the western Pacific Ocean. To its north across the Luzon Strait lies Taiwan. West across the South China Sea sits Vietnam...
.
Natib is located in the province
Provinces of the Philippines
The Provinces of the Philippines are the primary political and administrative divisions of the Philippines. There are 80 provinces at present, further subdivided into component cities and municipalities. The National Capital Region, as well as independent cities, are autonomous from any provincial...
of Bataan
Bataan
Bataan is a province of the Philippines occupying the whole of the Bataan Peninsula on Luzon. The province is part of the Central Luzon region. The capital of Bataan is Balanga City and it is bordered by the provinces of Zambales and Pampanga to the north...
, in region
Regions of the Philippines
In the Philippines, regions are administrative divisions that serve primarily to organize the provinces of the country for administrative convenience. Currently, the archipelagic republic of the Philippines is divided into 17 regions...
III, on western Luzon
Luzon
Luzon is the largest island in the Philippines. It is located in the northernmost region of the archipelago, and is also the name for one of the three primary island groups in the country centered on the Island of Luzon...
Island, in the Philippines. It is partially in Bataan National Park.
Physical features
Natib is a thermal stratovolcano with an elevation of 1253 metres (4,111 ft) aslAbove mean sea level
The term above mean sea level refers to the elevation or altitude of any object, relative to the average sea level datum. AMSL is used extensively in radio by engineers to determine the coverage area a station will be able to reach...
, and base diameter of 26 km.
Phivolcs records Natib as thermal: hotsprings Mamot, Tigulangin, Uyong and Paipit springs within Natib caldera have temperatures ranging from 30-56°C, low flows, and discharge neutral to slightly alkaline water.
Eruptions
Studies in 1991 indicate last eruptive activity probably to be HoloceneHolocene
The Holocene is a geological epoch which began at the end of the Pleistocene and continues to the present. The Holocene is part of the Quaternary period. Its name comes from the Greek words and , meaning "entirely recent"...
to upper Pleistocene
Pleistocene
The Pleistocene is the epoch from 2,588,000 to 11,700 years BP that spans the world's recent period of repeated glaciations. The name pleistocene is derived from the Greek and ....
, about 70,000 years ago. There have been no historical eruptions.
Geology
Rock type is biotiteBiotite
Biotite is a common phyllosilicate mineral within the mica group, with the approximate chemical formula . More generally, it refers to the dark mica series, primarily a solid-solution series between the iron-endmember annite, and the magnesium-endmember phlogopite; more aluminous endmembers...
hornblende
Hornblende
Hornblende is a complex inosilicate series of minerals .It is not a recognized mineral in its own right, but the name is used as a general or field term, to refer to a dark amphibole....
andesite
Andesite
Andesite is an extrusive igneous, volcanic rock, of intermediate composition, with aphanitic to porphyritic texture. In a general sense, it is the intermediate type between basalt and dacite. The mineral assemblage is typically dominated by plagioclase plus pyroxene and/or hornblende. Magnetite,...
trending to dacite
Dacite
Dacite is an igneous, volcanic rock. It has an aphanitic to porphyritic texture and is intermediate in composition between andesite and rhyolite. The relative proportions of feldspars and quartz in dacite, and in many other volcanic rocks, are illustrated in the QAPF diagram...
flows and dacitic tuffs.
Tectonically, Natib is on the Western Bataan Lineament.
Listings
- Smithsonian Institution lists Natib as Holocene(?) and mentions current thermal activity.
- Philippine Institute of Volcanology and SeismologyPhilippine Institute of Volcanology and SeismologyThe Philippine Institute of Volcanology and Seismology is a Philippine national institution dedicated to provide information on the activities of volcanoes, earthquakes and tsunamis, as well as other specialized information and services primarily for the protection of life and property and in...
(Phivolcs) lists Natib as Potentially Active.
See also
- Active volcanoes in the PhilippinesActive volcanoes in the PhilippinesActive is commonly termed for volcanoes with historical eruptions. Moreover, the Philippine Institute of Volcanology and Seismology classify active volcanoes in the country as having erupted within historical times , with accounts of these eruptions documented by man; or having erupted within the...
- Potentially active volcanoes in the Philippines
- List of inactive volcanoes in the Philippines
- Philippine Institute of Volcanology and SeismologyPhilippine Institute of Volcanology and SeismologyThe Philippine Institute of Volcanology and Seismology is a Philippine national institution dedicated to provide information on the activities of volcanoes, earthquakes and tsunamis, as well as other specialized information and services primarily for the protection of life and property and in...
- Pacific Ring of FirePacific Ring of FireThe Pacific Ring of Fire is an area where large numbers of earthquakes and volcanic eruptions occur in the basin of the Pacific Ocean. In a horseshoe shape, it is associated with a nearly continuous series of oceanic trenches, volcanic arcs, and volcanic belts and/or plate movements...