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dc.contributor.authorMorgan, L.A.
dc.contributor.authorShanks, W.C.P.
dc.contributor.authorPierce, K.L.
dc.contributor.authorIverson, N.
dc.contributor.authorSchiller, C.M.
dc.contributor.authorBrown, S.R.
dc.contributor.authorZahajska, P.
dc.contributor.authorCartier, R.
dc.contributor.authorCash, R.W.
dc.contributor.authorBest, J.L.
dc.contributor.authorWhitlock, C.
dc.contributor.authorFritz, S.
dc.contributor.authorBenzel, W.
dc.contributor.authorLowers, H.
dc.contributor.authorLovalvo, D.A.
dc.contributor.authorLicciardi, J.M.
dc.identifier.citationMorgan, L. A., W. C. P. Shanks, K. L. Pierce, N. Iverson, C. M. Schiller, S. R. Brown, P. Zahajska et al. "The dynamic floor of Yellowstone Lake, Wyoming, USA: The last 14 ky of hydrothermal explosions, venting, doming, and faulting." GSA Bulletin (2022).en_US
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dc.description.abstractHydrothermal explosions are significant potential hazards in Yellowstone National Park, Wyoming, USA. The northern Yellowstone Lake area hosts the three largest hydrothermal explosion craters known on Earth empowered by the highest heat flow values in Yellowstone and active seismicity and deformation. Geological and geochemical studies of eighteen sublacustrine cores provide the first detailed synthesis of the age, sedimentary facies, and origin of multiple hydrothermal explosion deposits. New tephrochronology and radiocarbon results provide a four-dimensional view of recent geologic activity since recession at ca. 15–14.5 ka of the >1-km-thick Pinedale ice sheet. The sedimentary record in Yellowstone Lake contains multiple hydrothermal explosion deposits ranging in age from ca. 13 ka to ∼1860 CE. Hydrothermal explosions require a sudden drop in pressure resulting in rapid expansion of high-temperature fluids causing fragmentation, ejection, and crater formation; explosions may be initiated by seismicity, faulting, deformation, or rapid lake-level changes. Fallout and transport of ejecta produces distinct facies of subaqueous hydrothermal explosion deposits. Yellowstone hydrothermal systems are characterized by alkaline-Cl and/or vapor-dominated fluids that, respectively, produce alteration dominated by silica-smectite-chlorite or by kaolinite. Alkaline-Cl liquids flash to steam during hydrothermal explosions, producing much more energetic events than simple vapor expansion in vapor-dominated systems. Two enormous explosion events in Yellow stone Lake were triggered quite differently: Elliott’s Crater explosion resulted from a major seismic event (8 ka) that ruptured an impervious hydrothermal dome, whereas the Mary Bay explosion (13 ka) was triggered by a sudden drop in lake level stimulated by a seismic event, tsunami, and outlet channel erosion.en_US
dc.publisherGeological Society of Americaen_US
dc.rightscopyright Geological Society of America 2022en_US
dc.subjectyellowstone lakeen_US
dc.subjecthydrothermal explosionsen_US
dc.subjectventing, doming, faultingen_US
dc.titleThe dynamic floor of Yellowstone Lake, Wyoming, USA: The last 14 k.y. of hydrothermal explosions, venting, doming, and faultingen_US
mus.citation.journaltitleGSA Bulletinen_US
mus.relation.collegeCollege of Letters & Scienceen_US
mus.relation.departmentEarth Sciences.en_US
mus.relation.universityMontana State University - Bozemanen_US

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