Indian Plate

Barren Island - AB

World Map (insert world map here) with citation (URL)
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Google Earth
Volcano Data
Volcano Name:
Barren Island
Location:
Indian Ocean Adaman Islands
Tectonic Plate:
Indo-Australian plate boundary and Eurasian plate boundary
Height:
354 Meters
Type of Volcano:
Stratovolcano
Rock type of lava:
Basaltic
Setting:
Plate Boundary
Date of Last Eruption:
January 2009
Type of Last Eruption:
Explosive Strombolian
Detailed map (insert detailed map here) with citation (URL)
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Google Earth
Typical Eruption: (type your description below) – you may include an eruption map with citation (URL)
Barren Island is a mildly explosive volcano. It is a stratovolcano. When it erupts, there is tephra that comes out and forms cinder cones. There are lava flows, but those don’t go very far because they are very viscous. There are some pyroclastic flows too. Gas slugs form and when they reach the top, magma spits up into the air. Since the lava is very viscous, Barren Island is explosive. The lava is also high in silica, so the rocks are light colored. The type of lava is basaltic which doesn’t match the type of volcano or the viscosity of the lava. Basaltic lava is usually very runny and low in silica, but the lava on Barren Island is high in silica and very viscous. Barren Island is 3 kilometers across, and there is a caldera open to the sea on the west side of the island. It stretches 2 kilometers across. You would expect Barren Island to be explosive because it is on a convergent plate boundary. Volcanoes on convergent plate boundaries tend to be explosive. Another thing that makes Barren Island explosive is that it’s an island so water gets into the chamber of the volcano and since it is so hot, the water turns to steam instantly and pressure builds up to make it explosive. Barren Island is the northernmost volcano in the Indonesian Arc.

Topographic Map (insert topographic map here) with citation (URL)
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http://www.ias.ac.in/currsci/jul252003/136.pdf

Hazards: (type your description below)
There aren’t a lot of really dangerous hazards because Barren Island is an island in the Andaman Sea. There are only 2 real hazards, one would be ash from the volcano floating to other islands in the Andaman Sea, and rocks and pieces of land that breakoff the island could potentially cause a tsunami.

Citations for information in MLA style:

“The Barren Island Volcano” Geological Survey of India. Web. 19 November 2009 http://www.gsi.gov.in/N_BarrenJan09Note.pdf

“Strombolian Eruption” Wikipedia. Web. 19 November 2009 http://en.wikipedia.org/wiki/Strombolian_eruption

Deccan Traps - MV

World Map (insert world map here) with citation (URL)
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Volcano Data
Volcano Name:
Deccan Traps
Location:
India/Asia
Tectonic Plate:
Indian
Height:
Over 6,500 feet (2,000 m)
Type of Volcano:
Basalt
Rock type of lava:
Tholeiitic Basalt
Setting:
Middle of a plate
Date of Last Eruption:
60 to 68 million years ago
Type of Last Eruption:

Detailed map (insert detailed map here) with citation (URL)
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MVDetailed.gif




Typical Eruption: (type your description below) – you may include an eruption map with citation (URL)
The Deccan Traps were formed between 60 and 68 million years ago. The volcanic eruption occur red at the Western Ghats near Munbai which was 66 million years ago. Most series of eruptions may have lasted fewer than 30,000 years in total. This volcano was formed of normal augite basalt. This is one of the largest volcanic features on the Earth. Deccan Traps consist of many layers of solidified flood basalt, and that together are more than 2,000 m thick and cover an area of 500,000 km 2. My volcano is like a valley.

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These are pictures of Deccan Traps.
Topographic Map (insert topographic map here) with citation (URL)
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Hazards: (type your description below)
The hazards of the Deccan Traps are that the eruptions created the traps, released huge quantities of particulates and heat-trapping greenhouse gases- carbon dioxide, sulphur dioxide, and water vapour- this would have caused catastrophic global climate changes. About 50,000 years ago, a huge meteorite (The Lonar Crater) made a deep hole in the Deccan Traps. This volcano consist of over 2,000,000 cubic kilometers of basaltic lava flows, in some of the areas reaches a thickness of over 2,400 meters. There are certain amounts of gas given off 33 trillon tons of co2, 6.6 trillion tons of so2 and 66 billion tons of fluorine and chlorine. The Deccan Traps at least 95 percent of the lavas are tholeiitic basalts, but there are other rock types occur which are Alkali basalts, Nephelinites, Lamprophyre, and Carbonatites. The gases that are released in the process may have played a role in the Cretarceous- Tetiary extinction event, which was the period of extinction of the non-avian dinosaurs.

Citations for information in MLA style:

http://en.wikipedia.org/wiki/Deccan_Traps

http://faculty.plattsburgh.edu/thomas.wolosz/volcanism.htm

http://www.springerlink.com/content/31r476u459734224/