Item talk:Q311693
From geokb
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"name": "Eruption age and duration of the ~9 km3 Burney Mountain dacite dome complex, northern California",
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"value": "10.1130/B35240.1",
"url": "https://doi.org/10.1130/B35240.1"
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"datePublished": "2019",
"dateModified": "2019-10-31",
"abstract": "At ~9 km3, the six dacite domes of Burney Mountain (db1\u2013db6) constitute the most voluminous Quaternary dome complex in the Cascades volcanic arc. Whole-rock geochemistry, electron microprobe, and petrographic data indicate that the domes are magmatically related, which, when integrated with geomorphology and stratigraphy, indicate early (db1, db2, db3) and late (db4, db5, db6) erupted groups. We present 40Ar/39Ar ages of 271.9\u00b14.6 ka (db1), 280.8\u00b18.2 and 281.7\u00b16.8 ka (db2), and 290.2\u00b16.0 ka (db3) along with a previous age of 280\u00b112 ka (db1). These ages scatter over 20 kyr, whereas remanent magnetic directions are similar between 53.3\u201359.0\u00b0 inclination and 352.7\u2013355.9\u00b0 declination. The latter dataset indicates that the dacite domes were emplaced over a geologically brief time interval; not thousands of years. Crystal-size distribution patterns of plagioclase were used to calculate residence times, which we use to infer the duration over which the eruptions likely occurred. Three slopes represent three populations of plagioclase crystals (fine-grained groundmass, coarse-grained groundmass, phenocrysts). A commonly used growth rate for plagioclase in dacitic magmas (10-10 mm/s) yields 9\u201310 years of growth for the coarse-grained groundmass (early erupted domes of db1, db2, db3), whereas plagioclase in the fine-grained groundmass (late erupted domes of db4, db5, db6) grew over 4\u20135 years. All plagioclase phenocrysts have apparent residence times of 26\u201336 years; however, they contain high An>70 resorbed cores with sieve textures, which have euhedral, lower An<65 overgrowth rims. Similarities in chemistry between groundmass plagioclase and phenocryst overgrowth rims indicate that they grew concurrently, and we therefore propose that both have similar residence times. Thus, the Burney Mountain dacite dome complex was emplaced during a single eruptive episode over the course of years to decades at 281.1\u00b14.8 ka (weighted mean age).",
"description": "15 p.",
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"name": "Geological Society of America"
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"name": "Downs, Drew T. ddowns@usgs.gov",
"givenName": "Drew T.",
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"name": "Champion, Duane E. dchamp@usgs.gov",
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