Columnar jointing

Source: Wikipedia, the free encyclopedia.

See also: List of places with columnar jointed volcanics
Columnar jointing in Giant's Causeway in Northern Ireland
Columnar jointing in the Alcantara Gorge, Sicily

Columnar jointing is a geological structure where sets of intersecting closely spaced fractures, referred to as

hydrothermal fluids and the expansion and contraction of the rock unit, both resulting from the presence of a nearby magmatic intrusion.[2]

The columns can vary from 3 meters to a few centimeters in diameter, and can be as much as 30 meters tall.[1] They are typically parallel and straight, but can also be curved and vary in diameter.[1] An array of regular, straight, and larger-diameter columns is called a colonnade; an irregular, less-straight, and smaller-diameter array is termed an entablature.[3] The number of sides of the individual columns can vary from 3 to 8, with 6 sides being the most common.[1]

Places

Main article: List of places with columnar jointed volcanics

Some famous locations in the United States where columnar jointing can be found are

Devils Postpile in California and the Columbia River flood basalts in Oregon, Washington and Idaho. Other famous places include the Giant's Causeway in Northern Ireland and Fingal's Cave on the island of Staffa, Scotland.[4]

Devils Tower

Main article: Devils Tower
Devils Tower is an eroded laccolith in the Black Hills National Forest, Wyoming.

Devils Tower in Wyoming in the United States is about 40 million years old and 382 meters (1,253 feet) high.[1] Geologists agree that the rock forming Devils Tower solidified from an intrusion, but it has not been established whether the magma from this intrusion ever reached the surface. Most columns are 6-sided, but 4, 5, and 7-sided ones can also be found.[5]

Giant's Causeway

Main article: Giant's Causeway

The Giant's Causeway (

Finn McCool created the Giant's Causeway, as a causeway to Scotland.[7]

Sōunkyō Gorge

Main article: Sōunkyō

Sōunkyō Gorge, a part of the town of Kamikawa, Hokkaido, Japan, features a 24-kilometre (15 mi) stretch of columnar jointing, which is the result of an eruption of the Daisetsuzan Volcanic Group 30,000 years ago.

Deccan Traps

Main article: Deccan Traps

The late Cretaceous Deccan Traps of India constitute one of the largest volcanic provinces of Earth, and examples of columnar jointing can be found in St. Mary's Island in the state of Karnataka.[8]

High Island Reservoir

Formed in Cretaceous, the columnar rocks are found around the reservoir and the islands nearby in Sai Kung, Hong Kong. It is special that the rocks are not mafic, but felsic tuff instead.

Hexagonal volcanic tuffs at East Dam of High Island Reservoir

Makhtesh Ramon

The columnar jointed sandstone of the HaMinsara (Carpentry Shop) in the

Negev desert, Israel
.

Columnar jointing in sandstone, Cerro Koi, Paraguay

Cerro Kõi

There are several examples of columnar jointed sandstones in the greater Asunción region of Paraguay. The best known is Cerro Kõi in Areguá, but there are also several quarries in Luque.

Mars

Main article: Marte Vallis

Several exposures of columnar jointing have been discovered on the planet Mars by the High Resolution Imaging Science Experiment (HiRISE) camera, which is carried by the Mars Reconnaissance Orbiter (MRO).[9][10]

Sawn Rocks

Columnar jointing at Sawn Rocks

Sawn Rocks, in

New South Wales, Australia, features 40 meters of columnar jointing above the creek and 30 meters below the surface.[11]

Basaltic Prisms of Santa María Regla

Main article: Basaltic Prisms of Santa María Regla

Alexander von Humboldt documented the prisms located in Huasca de Ocampo, in the Mexican state of Hidalgo.

Columnar basalt of Tawau (Batu Bersusun)

At Kampung Balung Cocos, Tawau, Malaysia, the river flows through the area of columnar basalt. One section is seen vertically high on river bank. The rest lies on river bank. The water flows from the lowest area forming waterfall.

Garni gorge

Gorge of Garni, Armenia

The Garni Gorge is situated 23 km east of Yerevan, Armenia, just below the village of the same name. This portion of the Garni Gorge is typically referred to as the "Symphony of the Stones." On a promontory above the gorge the first-century AD Temple of Garni may be seen.

See also

References

  1. ^ a b c d e f Oregon State University > Volcano World > ... > Columnar Jointing. Accessed 29 December 2013.
  2. ISSN 2586-1298
    .
  3. doi:10.1130/0016-7606(1986)97<1144:STACHO>2.0.CO;2
    .
  4. ^ southernhebrides.com > Staffa - A Geological Marvel. Accessed 29 December 2013.
  5. ^ U.S. National Park Service > Devils Tower > Geologic Formations. Accessed 29 December 2013.
  6. ^ National Trust > Giant's Causeway. Accessed 29 December 2013.
  7. ^ Northern Ireland Tourist Board > Causeway Coast & Glens > The Giant's Causeway > Folklore and Legend Archived 2015-05-02 at the Wayback Machine. Accessed 29 December 2013.
  8. ^ Geological Survey of India > Columnar Basalt Retrieved 17 April 2020.
  9. ^ "HiRISE | Columnar Jointing on Mars and Earth (ESP_029286_1885)".
  10. doi:10.1016/S0012-821X(00)00307-1
    .
  11. ^ Sawn Rocks walking track, Mount Kaputar National Park NSW National Parks and Wildlife Service. Retrieved 3 January 2019.
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External links

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