DOI: 10.1016/j.epsl.2018.08.002
Scopus记录号: 2-s2.0-85051833865
论文题名: Lithium diffusion in olivine records magmatic priming of explosive basaltic eruptions
作者: Lynn K.J. ; Shea T. ; Garcia M.O. ; Costa F. ; Norman M.D.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 500 起始页码: 127
结束页码: 135
语种: 英语
英文关键词: diffusion
; Hawai‘i
; Kīlauea
; lithium zoning
; olivine
Scopus关键词: Diffusion
; Explosives
; Lithium
; Mixing
; Silicate minerals
; Volcanoes
; Zoning
; Basaltic eruptions
; Eruption scenario
; Geodetic monitoring
; Geophysical methods
; Lithium diffusion
; Olivine phenocryst
; Reservoir systems
; Volcanic eruptions
; Olivine
; basalt
; diffusion
; geodetic network
; lithium
; magma chamber
; olivine
; seismicity
; volcanic eruption
; zoning
; Hawaii [(ISL) Hawaiian Islands]
; Hawaii [United States]
; Hawaiian Islands
; Kilauea
英文摘要: The short duration (e.g., hours to days) of magmatic processes leading up to volcanic eruptions are challenging to characterize using conventional petrologic and geophysical methods. This is especially true for eruptions that occurred prior to the implementation of seismic and geodetic monitoring (mid-20th century). We present a new application of diffusion chronometry that utilizes lithium zoning in olivine phenocrysts to investigate the timing of late-stage, pre-eruptive magma mixing at Kīlauea Volcano (Hawai‘i). The diffusive re-equilibration of sub-ppm changes in lithium concentration are modeled in rapidly quenched, well-oriented olivine from six eruptions during a dominantly explosive period (1500–1820 CE). Lithium timescales reveal repeated intrusion of primitive composition magma into Kīlauea's shallow (∼2–6 km) reservoir system typically only a few days prior to each eruption. These timescales are shorter than the weeks to years retrieved from modeling Fe–Mg and Ni zoning in the same olivine crystals, which record earlier magma mixing events. The short Li timescales indicate that an intrusion primed the shallow magma reservoir potentially only hours to a few days before an eruption. Late-stage intrusions and mixing events should thus be investigated at other basaltic volcanoes to better understand pre-eruptive processes, so that eruption scenarios can be better constrained. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109683
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Geology and Geophysics, University of Hawai‘i, Honolulu, HI 96822, United States; Department of Geological Sciences, University of Delaware, Newark, DE 19716, United States; Earth Observatory of Singapore, Asian School of the Environment, Nanyang Technological University, Singapore, 639798, Singapore; Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia
Recommended Citation:
Lynn K.J.,Shea T.,Garcia M.O.,et al. Lithium diffusion in olivine records magmatic priming of explosive basaltic eruptions[J]. Earth and Planetary Science Letters,2018-01-01,500