Chilcotin Basalts Eruption Characteristics

The video explores vast geologically recent lava fields in North America, focusing on the Chilcotin Basalts in British Columbia. It details the characteristics, history, and eruption patterns of these basalts, comparing them to other notable lava fields. Theories on their formation, including connections to the Anahim hotspot and continental back arc volcanism, are discussed.

Which of the following is NOT a lava field mentioned in the introduction?

• Snake River Plain

• Columbia River flood basalts

• High lava plains in Oregon

• Hawaiian Islands

What is the approximate size of the area covered by the Chilcotin Basalts?

• 17,000 square kilometers

• 44,000 square kilometers

• 70,000 square kilometers

• 10,000 square kilometers

During which time period did the majority of the Chilcotin Basalts form?

• Between 170,000 and 10,000 years ago

• Between 6 and 3 million years ago

• Between 10 and 1 million years ago

• Between 31.6 and 10 million years ago

What is the typical speed of lava flows from the Chilcotin Basalts?

• 1 kilometer per hour

• 5 kilometers per hour

• 10 kilometers per hour

• 15 kilometers per hour

How many cubic kilometers of lava were typically emplaced during each Chilcotin Basalt eruption?

• Between 30 and 35 cubic kilometers

• Between 20 and 25 cubic kilometers

• Between 10 and 15 cubic kilometers

• Between 1 and 5 cubic kilometers

What is the term used to describe vents that erupt only once?

• Trigenetic

• Polygenetic

• Monogenetic

• Bigenetic

During which period did the eruption rate of the Chilcotin Basalts reach its peak?

• Early Miocene

• Middle Miocene

• Oligocene

• Late Miocene

Which theory suggests that the Chilcotin Basalts are related to a hotspot?

• Anahim hotspot

• Icelandic hotspot

• Hawaiian hotspot

• Yellowstone hotspot

What geological process might be causing the topography to spread in the Chilcotin Basalts region?

• Subduction

• Upwelling mantle material

• Tectonic collision

• Erosion

Which volcanic field is mentioned as being created by the same process as the Chilcotin Basalts?

• Wells-Gray Clearwater volcanic field

• Hawaiian Islands

• Snake River Plain

• Columbia River flood basalts