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31 Οκτ 2023 · By about 30,000 years ago, Mount Mazama began to generate increasingly explosive eruptions and thick flows of silica-rich rhyodacite lava. The change to more explosive and silica-rich eruptions was an outward sign that a large volume of silicic magma had begun to accumulate deep beneath the volcano.
23 Οκτ 2023 · Mount Mazama began erupting relatively continuously 420,000 years ago as a complex of overlapping shields and stratovolcanoes, each of which probably was active for up to 70,000 years. The massive volcano erupted violently 7,700 years ago, accompanied by collapse of the entire upper half of the edifice.
1 Ιαν 2006 · The Cascade arc volcano known as Mount Mazama collapsed during its climactic eruption of ∼50 km 3 of mainly rhyodacitic magma ∼7700 yr ago to form Crater Lake caldera.
3 Μαΐ 2024 · Mount Mazama began to form half a million years ago, experiencing numerous large eruptions which caused the mountain to grow over time. The volcano is estimated to have stood at over 12,000 feet tall before its final cataclysmic eruption, which today would make it the 4th largest volcano in the Cascades, behind Mt. Adams (Crater Lake, 2001, p. 1).
Climactic eruption An overall timeline for the Mazama eruptions. Mazama's climactic eruption has been dated to about 6,845 ± 50 years ago via radiocarbon dating, or about 7,700 years ago via dendrochronology. [48]
Eruptive history and geochronology of Mount Mazama and the Crater Lake region, Oregon
This site features a detailed table, excerpted from a paper by Charles R. Bacon (USGS), summarizing the volcanic history of Mount Mazama and Crater Lake Caldera, Oregon. Descriptions of the major ...
