What plates formed the Cascade mountain range?

What plates formed the Cascade mountain range?

The Cascades are a chain of volcanoes at a convergent boundary where an oceanic plate is subducting beneath a continental plate. Specifically the volcanoes are the result of subduction of the Juan de Fuca, Gorda, and Explorer Plates beneath North America.

How were the Cascade Range formed?

The Cascade Volcanoes were formed by the subduction of the Juan de Fuca, Explorer and the Gorda Plate (remnants of the much larger Farallon Plate) under the North American Plate along the Cascadia subduction zone.

What was the Cascade Range built by?

Geology. The Cascade range was formed by thousands of small, short-lived volcanoes that built a platform of lava and volcanic debris. Rising above this volcanic platform are a few strikingly large volcanoes, like Mount St. Helens, that dominate the landscape.

What type of range is the Cascades?

The Cascade Range, also referred to as the Cascades, is a major mountain range that extends from southern British Columbia to Northern California. Extending northward for over 700 miles, the Cascades range stretches from Lassen Peak in northern California, through Oregon and Washington before reaching British Columbia.

Is the Juan de Fuca Plate convergent or divergent?

The Juan de Fuca and Gorda ridges mark the divergent plate boundary (the spreading ridge) with the Pacific plate. The Cascadia trench marks the subduction zone with the North American plate. The arrow shows the direction of convergence.

What tectonic plate is Mount Rainier on?

North American plate
Mount Rainier (Figure 2.1) is one of about two dozen recently active volcanoes in the Cascade Range, a volcanic arc formed by subduction of the Juan de Fuca plate beneath the North American plate.

What type of rock is the Cascade mountains?

volcanic igneous rock
The Cascades are primarily composed of volcanic igneous rock, the youngest of which is found in the active volcanoes of the High Cascades—strikingly large stratovolcanoes that rise high above the landscape of the range.

What plate is Indonesia on?

Eurasian Plate
Indonesia is located between two continental plates: the Eurasian Plate (Sunda Plate) and Australian Plate (Sahul Shelf); and between two oceanic plates: the Philippine Sea Plate and Pacific Plate.

How far south do the Cascades go?

Cascade Range, segment of the Pacific mountain system of western North America. The Cascades extend northward for more than 700 miles (1,100 km) from Lassen Peak, in northern California, U.S., through Oregon and Washington to the Fraser River in southern British Columbia, Canada.

Is the Cascade Range the same as the Cascade mountains?

The Cascade mountain system extends from northern California to central British Columbia. In Oregon, it comprises the Cascade Range, which is 260 miles long and, at greatest breadth, 90 miles wide (fig. 1).

What type of plate is Juan de Fuca plate?

North American Plate
The Juan de Fuca Plate is a small tectonic plate (microplate) generated from the Juan de Fuca Ridge that is subducting under the northerly portion of the western side of the North American Plate at the Cascadia subduction zone. It is named after the explorer of the same name.

What type of plate is the North American plate?

continental plate plate is exemplified by the North American Plate, which includes North America as well as the oceanic crust between it and a portion of the Mid-Atlantic Ridge.

What kind of mountains are in the Cascade Range?

It includes both non-volcanic mountains, such as the North Cascades, and the notable volcanoes known as the High Cascades. The small part of the range in British Columbia is referred to as the Canadian Cascades or, locally, as the Cascade Mountains.

How are the Cascades and the High Cascades formed?

On the other hand, the southern section of the Cascades, including the High Cascades, was formed as a result of volcanic activity. The Cascade Range was formed through a process of subduction when the Juan de Fuca Plate (oceanic crust) dove under the North American Plate (continental crust).

What was the first road through the Cascade Range?

The Barlow Road was the first established land path for U.S. settlers through the Cascade Range in 1845, and formed the final overland link for the Oregon Trail (previously, settlers had to raft down the treacherous rapids of the Columbia River).

How did the Juan de Fuca Plate form the Cascade Arc?

Melting of the Juan de Fuca Plate at depth intruded magma into the continental margin to form the Cascade Arc. The îblobî of volcanic rock riding on the top of the Juan de Fuca plate is the Crescent Basalt, unsuccessfully trying to subduct beneath the continent. These rocks were uplifted to form the Olympic Mountains.