Play Video
1
Super-Volcanoes, Part 2: La Garita
Super-Volcanoes, Part 2: La Garita
::2011/02/16::
Play Video
2
La Garita Caldera.wmv
La Garita Caldera.wmv
::2010/02/17::
Play Video
3
Supervolcanoes Around The World.
Supervolcanoes Around The World.
::2011/10/06::
Play Video
4
SUPERVOLCANES
SUPERVOLCANES
::2013/01/07::
Play Video
5
Vulkanausbrüche  || Vulcanoes eruptions
Vulkanausbrüche || Vulcanoes eruptions
::2013/07/22::
Play Video
6
Vulkanausbrüche || vulcanoes eruptions 2
Vulkanausbrüche || vulcanoes eruptions 2
::2013/07/22::
Play Video
7
Igneous rocks of Colorado. Cross sections showing different kinds of igneous intrusions.
Igneous rocks of Colorado. Cross sections showing different kinds of igneous intrusions.
::2013/11/04::
Play Video
8
La Garita Colorado Property
La Garita Colorado Property
::2012/12/17::
Play Video
9
Casa en venta en Boquete - Urb. Montañas de Caldera. Chiriquí. Prestige Panama Realty. 6981.5000
Casa en venta en Boquete - Urb. Montañas de Caldera. Chiriquí. Prestige Panama Realty. 6981.5000
::2013/12/07::
Play Video
10
Volcanolgy and the Long Valley Caldera
Volcanolgy and the Long Valley Caldera
::2009/07/14::
Play Video
11
Balneario "La Caldera" , Abasolo, Gto. Mex.
Balneario "La Caldera" , Abasolo, Gto. Mex.
::2010/04/02::
Play Video
12
Buceando con Nerea, Jon,  Basileo  y Ordoño
Buceando con Nerea, Jon, Basileo y Ordoño
::2010/06/22::
Play Video
13
Super-Volcanoes, Part 3: Long Valley Caldera
Super-Volcanoes, Part 3: Long Valley Caldera
::2011/02/17::
Play Video
14
Gran Canaria - Telde - La Garita
Gran Canaria - Telde - La Garita
::2014/03/25::
Play Video
15
Supervolcanoes.Toba Lake,Yellowstone Caldera,Long Valley and Taupo Lake.
Supervolcanoes.Toba Lake,Yellowstone Caldera,Long Valley and Taupo Lake.
::2011/10/04::
Play Video
16
Costanera el Jueves 04 Febrero 2010
Costanera el Jueves 04 Febrero 2010
::2010/02/05::
Play Video
17
LA GARITA Alajuela Farm with 4 Homes For Sale
LA GARITA Alajuela Farm with 4 Homes For Sale
::2014/02/26::
Play Video
18
La Caldera Abasolo Guanajuato
La Caldera Abasolo Guanajuato
::2010/08/05::
Play Video
19
ID 1016. Beautiful house in La Garita
ID 1016. Beautiful house in La Garita
::2013/03/26::
Play Video
20
StoneAgeMen Expediciones de Aventura Cañonismo en la Garita Cueramaro, Gto.
StoneAgeMen Expediciones de Aventura Cañonismo en la Garita Cueramaro, Gto.
::2012/08/08::
Play Video
21
La Garita
La Garita
::2013/07/11::
Play Video
22
The King Ludwig Train Trix H0 21231 DCC(Argentina)
The King Ludwig Train Trix H0 21231 DCC(Argentina)
::2011/12/06::
Play Video
23
La Caldera Abasolo Gto.
La Caldera Abasolo Gto.
::2010/03/01::
Play Video
24
La Caldera Abasolo Gto.
La Caldera Abasolo Gto.
::2010/03/07::
Play Video
25
La Garita
La Garita
::2012/11/17::
Play Video
26
Ruta 27 caldera - San Pablo / Costa Rica
Ruta 27 caldera - San Pablo / Costa Rica
::2014/03/10::
Play Video
27
Túrrucares - Ruta 27 Caldera / Costa Rica
Túrrucares - Ruta 27 Caldera / Costa Rica
::2014/03/26::
Play Video
28
La Pauta - Elenkow, Cronos, Revol, Crunk & Jayboss "La Garita RECORD
La Pauta - Elenkow, Cronos, Revol, Crunk & Jayboss "La Garita RECORD'S"
::2012/03/22::
Play Video
29
Cañonismo - La Garita (Campamento)
Cañonismo - La Garita (Campamento)
::2013/05/21::
Play Video
30
Long Valley Caldera SUPER VOLCANO Pt 2 8/17/11 - 8/25/11
Long Valley Caldera SUPER VOLCANO Pt 2 8/17/11 - 8/25/11
::2011/08/26::
Play Video
31
PROTESTARÁN EN LA GARITA DE VILLA AHUMADA
PROTESTARÁN EN LA GARITA DE VILLA AHUMADA
::2013/09/07::
Play Video
32
La Caldera, Abasolo Guanajuato
La Caldera, Abasolo Guanajuato
::2010/08/03::
Play Video
33
Antonio Tamayo y Juan Navas en la zona de la Garita
Antonio Tamayo y Juan Navas en la zona de la Garita
::2013/11/02::
Play Video
34
"La Trastienda de Caldera"
"La Trastienda de Caldera"
::2011/02/19::
Play Video
35
castillo de la garita..
castillo de la garita..
::2012/12/21::
Play Video
36
La Garita
La Garita
::2012/05/24::
Play Video
37
La Garita 2
La Garita 2
::2013/09/14::
Play Video
38
Restaurant and Convenience Store in La Garita CO
Restaurant and Convenience Store in La Garita CO
::2014/01/15::
Play Video
39
Buceando en Tarifa San Andres, La Garita, Las Calles
Buceando en Tarifa San Andres, La Garita, Las Calles
::2013/03/29::
Play Video
40
Rancho La Garita
Rancho La Garita
::2012/04/17::
Play Video
41
PECIO DE LAS CALDERAS.wmv
PECIO DE LAS CALDERAS.wmv
::2011/12/02::
Play Video
42
La Garita Parade 1
La Garita Parade 1
::2013/09/14::
Play Video
43
Coronación de Reinas en La Garita, Pasaquiuna 2011.
Coronación de Reinas en La Garita, Pasaquiuna 2011.
::2011/01/07::
Play Video
44
La Garita Tracts 247 and 248.swf
La Garita Tracts 247 and 248.swf
::2012/04/02::
Play Video
45
La Garita
La Garita
::2012/08/22::
Play Video
46
Abasolo Balnearios Gruta La garita
Abasolo Balnearios Gruta La garita
::2010/06/05::
Play Video
47
la garita salinetas melenara
la garita salinetas melenara
::2012/08/20::
Play Video
48
Katty Ravlic en el concurso "7 Reinas para Caldera"
Katty Ravlic en el concurso "7 Reinas para Caldera"
::2009/09/14::
Play Video
49
Daniel SP en el bufadero de la GARITA.
Daniel SP en el bufadero de la GARITA.
::2013/01/23::
Play Video
50
CLASA La Piedad vs La Garita
CLASA La Piedad vs La Garita
::2011/05/22::
NEXT >>
RESULTS [51 .. 101]
From Wikipedia, the free encyclopedia
Jump to: navigation, search
La Garita Caldera
WheelerGACO.jpg
Ash formations of La Garita Caldera, looking northeast. (Wheeler Geologic Monument)
Location
La Garita Caldera is located in Colorado
La Garita Caldera
La Garita Caldera
Location of La Garita Caldera within Colorado
Location Mineral County, Colorado, USA, near Creede
Range San Juan Mountains
Coordinates 37°45′23″N 106°56′03″W / 37.75639°N 106.93417°W / 37.75639; -106.93417Coordinates: 37°45′23″N 106°56′03″W / 37.75639°N 106.93417°W / 37.75639; -106.93417
Geology
Type Caldera
Last eruption 26.3 Ma (Fish Canyon Tuff 27.8 Ma)

La Garita Caldera is a large volcanic caldera located in the San Juan volcanic field in the San Juan Mountains near the town of Creede in southwestern Colorado, United States.[1] It lies to the west of the town of La Garita, Colorado. The eruption that created the La Garita Caldera is the largest known explosive eruption in Earth's history.[2]

Date[edit]

The La Garita Caldera is one of a number of calderas that formed during a massive ignimbrite flare-up in Colorado, Utah and Nevada from 40–25 million years ago, and was the site of massive eruptions about 28–26 million years ago, during the Oligocene Epoch.

Province[edit]

The area devastated by the La Garita eruption is thought[by whom?] to have covered a significant portion of what is now Colorado, and some research suggests the aerial extent may be as far as the east coast of North America and the Caribbean.[citation needed]

Size of eruption[edit]

The scale of La Garita volcanism was one of greatest in recent geologic history. The resulting deposit, known as the Fish Canyon Tuff, has a volume of approximately 1,200 cubic miles (5,000 km3), rating it an 8 on the Volcanic Explosivity Index. This is enough material to fill Lake Michigan. By comparison, the May 18, 1980 eruption of Mt. St. Helens was only 0.25 cubic miles (1.0 km3) in volume. The eruption was energetically equivalent to 240,000 megatons of TNT.[citation needed]

By contrast, the most powerful human-made explosive device ever detonated, the Tsar Bomba or King of the Bombs, had a yield of 50 megatons, whereas the eruption at La Garita was about 5,000 times more energetic. However, because Tsar Bomba's reaction was complete within microseconds, while a volcanic explosion can take seconds or minutes, the power of the events are comparable. It is one of the most energetic events on Earth since the Chicxulub impact, which was 400 times more powerful than La Garita.

Geology[edit]

The Fish Canyon Tuff, made of dacite, is uniform in its petrological composition and forms a single cooling unit despite the huge volume. Dacite is a silicic volcanic rock common in explosive eruptions, lava domes and short thick lava flows. There are also large intracaldera lavas composed of andesite, a volcanic rock compositionally intermediate between basalt (poor in silica content) and dacite (higher silica content) in the La Garita Caldera.

The caldera itself, like the eruption of Fish Canyon Tuff, is quite large in scale. It is 35 by 75 kilometers (22 by 47 mi) oblong shape . Most supervolcano calderas of explosive origin are slightly ovoid or oblong in shape. Because of the vast scale and erosion, it took scientists over 30 years to fully determine the size of the caldera. La Garita can be considered a "supervolcano", albeit an extinct one.

La Garita is also the source of at least 7 major eruptions of welded tuff deposits over a time span of 1.5 million years since the Fish Canyon Tuff eruption. The caldera is also known to have extensive outcrops of a very unusual lava-like rock made of dacite that is very similar to that of the Fish Canyon Tuff. This rock, which has characteristics of both lava and welded tuff, was erupted probably shortly before the Fish Canyon Tuff. The lava-like rock has been interpreted as having erupted as thick spatter during low-energy lava fountaining. The lava-like rock is also voluminous — up to 200–300 cubic kilometers (48–72 cu mi).

See also[edit]

References[edit]

  1. ^ Steven, Thomas A.; Lipman, Peter W. (1976). "Calderas of the San Juan Volcanic Field, Southwestern Colorado". U.S. Geological Survey Professional Papers (Washington, DC: U.S. Government Printing Office) 958: 1–35. Retrieved 2012-05-16. 
  2. ^ "What's the Biggest Volcanic Eruption Ever?". livescience.com. November 10, 2010. Retrieved 2014-02-01. 

Bibliography[edit]

External links[edit]

Wikipedia content is licensed under the GFDL License
Powered by YouTube
LEGAL
  • Mashpedia © 2014