The Geologic Oddity in Chile; The World's Largest Dacite Lava Flow

Within Chile exists a lava flow that is more than 2,000 feet thick in some areas and covers and area of just under 29 square miles. Known as the Chao dacite flow, it is the planet's most voluminous dacite composition lava flow to erupt during the last 2.58 million years. This video will discuss why this unusual lava flow formed, and how it relates to one of the world's largest magma bodies.

Thumbnail Photo Credit: (Central Photo: Image from (Coombs, M. L., Alaska Volcano Observatory / U.S. Geological Survey, https://avo.alaska.edu/images/image.p..., (Border/Edge Photo: F. Trusdell, U.S. Geological Survey, Hawaiian Volcano Observatory, Public Domain, https://www.usgs.gov/media/images/nov..., (with the top right border containing the GeologyHub logo). Note: This thumbnail image as a whole is NOT in the public domain. Only the source photo for the image's edge/border texture (the black cooling Mauna Loa lava texture) and the source central photo (showing a lava fountain) is in the public domain, and not the GeologyHub logo or the overlaying text.

Note: The height of the mentioned Chao Dacite lava flow was based on the difference in elevation obtained on Google Earth via the subtracting the height at the top of the lava flow by the elevation at the bottom of the lava flow.

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Sources/Citations:
[1] González-Maurel, O., Deegan, F.M., le Roux, P. et al. Constraining the sub-arc, parental magma composition for the giant Altiplano-Puna Volcanic Complex, northern Chile. Sci Rep 10, 6864 (2020). https://doi.org/10.1038/s41598-020-63..., CC BY 4.0
[2] Daryl L. Gusey, Paul E. Hammond, John P. Lasher, 2019. "Tieton andesite, south-central Washington Cascades: Two of the longest known andesite lava flows", Field Volcanology: A Tribute to the Distinguished Career of Don Swanson, Michael P. Poland, Michael O. Garcia, Victor E. Camp, Anita Grunder
[3] Delgado, Francisco & Pavez, Andres. (2015). New insights into La Pacana caldera inner structure based on a gravimetric study (central Andes, Chile). Andean Geology. 42. 313-328. 10.5027/andgeoV42n3-a02. CC BY 4.0
[4] Hildreth, W.. (2007). Quaternary magmatism in the Cascades - Geologic perspectives. US Geological Survey Professional Paper. 1-125.
[5] Brooks, Gregory & Friele, Pierre. (2011). Bracketing ages for the formation of the Ring Creek lava flow, Mount Garibaldi volcanic field, southwestern British Columbia. Canadian Journal of Earth Sciences. 29. 2425-2428. 10.1139/e92-190.
[6] U.S. Geological Survey

0:00 Large & Long Lava Flows
2:08 Geologic Setting
2:30 Altiplano Puma Magma Body
3:32 Dacite Lava Erupts
4:23 Conclusion