Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1130/B35240.1 |
Eruption age and duration of the similar to 9 km(3) Burney Mountain dacite dome complex, northern California, USA | |
Downs, Drew T.; Clynne, Michael A.; Champion, Duane E.; Muffler, L. J. Patrick | |
2020-05-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
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ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2020 |
卷号 | 132期号:5-6页码:1150-1164 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | At similar to 9 km(3), the six dacite domes (db1-db6) of Burney Mountain, northern California, USA, 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 stratigraphic superposition, indicate early (db1, db2, and db3) and late (db4, db5, and db6) erupted groups. We present Ar-40/Ar-39 ages of 271.9 +/- 4.6 ka (db1), 280.8 +/- 8.2 and 281.7 +/- 6.8 ka (db2), and 290.2 +/- 6.0 ka (db3) along with a previous age of 280 +/- 12 ka (db1). These ages scatter over 20 k.y., whereas remanent magnetic directions are similar between 53.3-59.0 degrees inclination and 352.7-355.9 degrees declination. The latter data set 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, and phenocrysts). A commonly used growth rate for plagioclase in dacitic magmas (10(-10) mm/s) yields 9-10 yr of growth for the coarse-grained groundmass (early erupted domes of db1, db2, and db3), whereas plagioclase in the fine-grained groundmass (late erupted domes of db4, db5, and db6) grew over 4-5 yr. All plagioclase phenocrysts have apparent residence times of 26-36 yr; however, they contain high anorthite (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 +/- 4.8 ka (weighted mean age). |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000530917400017 |
WOS关键词 | CRYSTAL SIZE-DISTRIBUTION ; HAT CREEK FAULT ; ST-HELENS ; DISTRIBUTION CSD ; LASSEN PEAK ; MAGMATIC PROCESSES ; LAVA DOMES ; CRYSTALLIZATION ; PLAGIOCLASE ; KINETICS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/279455 |
专题 | 地球科学 |
作者单位 | US Geol Survey, Calif Volcano Observ, 345 Middlefield Rd, Menlo Pk, CA 94025 USA |
推荐引用方式 GB/T 7714 | Downs, Drew T.,Clynne, Michael A.,Champion, Duane E.,et al. Eruption age and duration of the similar to 9 km(3) Burney Mountain dacite dome complex, northern California, USA[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2020,132(5-6):1150-1164. |
APA | Downs, Drew T.,Clynne, Michael A.,Champion, Duane E.,&Muffler, L. J. Patrick.(2020).Eruption age and duration of the similar to 9 km(3) Burney Mountain dacite dome complex, northern California, USA.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,132(5-6),1150-1164. |
MLA | Downs, Drew T.,et al."Eruption age and duration of the similar to 9 km(3) Burney Mountain dacite dome complex, northern California, USA".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 132.5-6(2020):1150-1164. |
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