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Most of the volcanoes in the Oregon Cascades are either scoria cones, small shield volcanoes, or lava fields, though the segment contains a number of basaltic andesite stratovolcanoes such as Mount McLoughlin. [7] Black Butte is one such stratovolcano [4] (also known as a composite volcano), [9] with a mafic (rich in magnesium and iron ...
A stratovolcano, also known as a composite volcano, is a typically conical volcano built up by many alternating layers of hardened lava and tephra. [1] Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile with a summit crater and explosive eruptions. [2] Some have collapsed summit craters called calderas. [3]
A complex volcano, also called a compound volcano or a volcanic complex, is a mixed landform consisting of related volcanic centers and their associated lava flows and pyroclastic rock. [1] They may form due to changes in eruptive habit or in the location of the principal vent area on a particular volcano. [2]
Socompa is a 6,051-metre-high (19,852 ft) [b] [c] [27] composite volcano [4] consisting of a central cone and several lava domes; [28] it is the most voluminous conical volcano of the Central Volcanic Zone [29] and one of the highest edifices there, rising more than 2 kilometres (1.2 mi) above the surrounding terrain. [30]
Location in Oregon relative to other major volcanoes. The major landmark for the Rogue River Valley, [4] Mount McLoughlin reaches an elevation of 9,493 feet (2,893 m). [1] The tallest volcano in between Mount Shasta — located 70 miles (110 km) to the south [5] — and South Sister 120 miles (190 km) to the north, it lies in the Cascade Range, in the southern portion of the U.S. state of ...
Mount Mazama (Klamath: Tum-sum-ne [5]) is a complex volcano in the western U.S. state of Oregon, in a segment of the Cascade Volcanic Arc and Cascade Range.The volcano is in Klamath County, in the southern Cascades, 60 miles (97 km) north of the Oregon–California border.
It consists mainly of volcanic rocks that form the largest remnant of a major composite volcanic field that covered most of the southern Rocky Mountains in the Middle Tertiary geologic time. [1] There are approximately fifteen calderas known in the San Juan Volcanic Fields; however, it is possible that there are two or even three more in the ...
The volcano formed during the Pleistocene epoch, about one million years ago, and since the most recent ice age, it has produced some of the largest and most explosive eruptions in the state. When continental ice sheets retreated from the region, Glacier Peak began to erupt regularly, erupting explosively five times in the past 3,000 years.