Item talk:Q66100
From geokb
{
"USGS Publications Warehouse": { "schema": { "@context": "https://schema.org", "@type": "CreativeWork", "additionalType": "USGS Numbered Series", "name": "Timing of degassing and plagioclase growth in lavas erupted from Mount St. Helens, 2004-2005, from 210Po-210Pb-226Ra disequilibria", "identifier": [ { "@type": "PropertyValue", "propertyID": "USGS Publications Warehouse IndexID", "value": "pp175037", "url": "https://pubs.usgs.gov/publication/pp175037" }, { "@type": "PropertyValue", "propertyID": "USGS Publications Warehouse Internal ID", "value": 70047431 }, { "@type": "PropertyValue", "propertyID": "DOI", "value": "10.3133/pp175037", "url": "https://doi.org/10.3133/pp175037" } ], "inLanguage": "en", "isPartOf": [ { "@type": "CreativeWorkSeries", "name": "Professional Paper" } ], "datePublished": "2008", "dateModified": "2019-05-31", "abstract": "Disequilibrium between 210Po, 210Pb, and 226Ra was \nmeasured on rocks and plagioclase mineral separates erupted \nduring the first year of the ongoing eruption of Mount St. \nHelens. The purpose of this study was to monitor the volatile \nfluxing and crystal growth that occurred in the weeks, years, \nand decades leading up to eruption. Whole-rock samples were \nleached in dilute HCl to remove 210Po precipitated in open \nspaces. Before leaching, samples had variable initial (210Po) \nvalues, whereas after leaching, the groundmasses of nearly all \njuvenile samples were found to have had (210Po) \u2248 0 when they \nerupted. Thus, most samples degassed 210Po both before and \nafter the magmas switched from open- to closed-system degassing. All juvenile samples have (210Pb)/(226Ra) ratios within \n2 \u03b4 of equilibrium, suggesting that the magmas involved in the \nongoing eruption did not have strong, persistent fluxes of 222Rn \nin or out of magmas during the decades and years leading to \neruption. These equilibrium values also require a period of at \nleast a century after magma generation and the last significant \ndifferentiation of the Mount St. Helens dacites. Despite this, \nthe elevated (210Pb)/(226Ra) value measured in a plagioclase \nmineral separate from lava erupted in 2004 suggests that a \nsignificant proportion of this plagioclase grew within a few \ndecades of eruption. The combined dataset suggests that for \nmost 2004-5 lavas, the last stage of open-system degassing \nof the dacite magmas at Mount St. Helens is confined to the \nperiod between 1-2 years and 1-2 weeks before eruption, whereas plagioclase large enough to be included in the mineral \nseparate grew around the time of the 1980s eruption or earlier.", "description": "10 p.", "publisher": { "@type": "Organization", "name": "U.S. Geological Survey" }, "author": [ { "@type": "Person", "name": "Thornber, Carl R. cthornber@usgs.gov", "givenName": "Carl R.", "familyName": "Thornber", "email": "cthornber@usgs.gov", "affiliation": [ { "@type": "Organization", "name": "Cascades Volcano Observatory", "url": "https://www.usgs.gov/cascades-volcano-observatory" } ] }, { "@type": "Person", "name": "Pallister, John S. jpallist@usgs.gov", "givenName": "John S.", "familyName": "Pallister", "email": "jpallist@usgs.gov", "identifier": { "@type": "PropertyValue", "propertyID": "ORCID", "value": 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"Volcano Science Center", "url": "https://www.usgs.gov/centers/volcano-science-center" } ] }, { "@type": "Person", "name": "Stauffer, Peter H. pstauffe@usgs.gov", "givenName": "Peter H.", "familyName": "Stauffer", "email": "pstauffe@usgs.gov" }, { "@type": "Person", "name": "Scott, William E. wescott@usgs.gov", "givenName": "William E.", "familyName": "Scott", "email": "wescott@usgs.gov", "identifier": { "@type": "PropertyValue", "propertyID": "ORCID", "value": "0000-0001-8156-979X", "url": "https://orcid.org/0000-0001-8156-979X" }, "affiliation": [ { "@type": "Organization", "name": "Volcano Science Center", "url": "https://www.usgs.gov/centers/volcano-science-center" } ] } ], "funder": [ { "@type": "Organization", "name": "Volcano Hazards Program", "url": "https://www.usgs.gov/programs/VHP" } ], "spatialCoverage": [ { "@type": "Place", "additionalType": "country", "name": "United States", "url": "https://geonames.org/4074035" }, { "@type": "Place", "additionalType": "state", "name": 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