DOI: 10.1016/j.epsl.2017.11.033
Scopus记录号: 2-s2.0-85038207662
论文题名: Mafic enclaves record syn-eruptive basalt intrusion and mixing
作者: Plail M. ; Edmonds M. ; Woods A.W. ; Barclay J. ; Humphreys M.C.S. ; Herd R.A. ; Christopher T.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 484 起始页码: 30
结束页码: 40
语种: 英语
英文关键词: andesite
; arc
; eruption triggering
; mafic enclaves
; mixing
Scopus关键词: Boundary layers
; Mercury (metal)
; Mixing
; Volcanoes
; andesite
; Basalt intrusion
; eruption triggering
; In compositions
; Mafic enclaves
; Magma reservoirs
; Temporal trends
; Thermal boundary layer
; Basalt
; analytical method
; andesite
; basalt
; igneous intrusion
; inclusion
; mafic rock
; mixing
; trigger mechanism
; volcanic eruption
; Leeward Islands [Lesser Antilles]
; Montserrat
; Soufriere Hills Volcano
英文摘要: Mafic enclaves hosted by andesite erupted at the Soufrière Hills Volcano between 1995 and 2010 yield insights into syn-eruptive mafic underplating of an andesite magma reservoir, magma mixing and its role in sustaining eruptions that may be widely applicable in volcanic arc settings. The mafic enclaves range in composition from basalt to andesite and are generated from a hybrid thermal boundary layer at the interface between the two magmas, where the basalt quenches against the cooler andesite, and the two magmas mix. We show, using an analytical model, that the enclaves are generated when the hybrid layer, just a few tens of centimetres thick, becomes buoyant and forms plumes which rise up into the andesite. Mafic enclave geochemistry suggests that vapour-saturated basalt was underplated quasi-continuously throughout the first three eruptive phases of the eruption (the end member basalt became more Mg and V-rich over time). The andesite erupted during the final phases of the eruption contained more abundant and larger enclaves, and the enclaves were more extensively hybridised with the andesite, suggesting that at some time during the final few years of the eruption, the intrusion of mafic magma at depth ceased, allowing the hybrid layer to reach a greater thickness, generating larger mafic enclaves. The temporal trends in mafic enclave composition and abundance suggests that basalt recharge and underplating sustained the eruption by the transfer of heat and volatiles across the interface and when the recharge ceased, the eruption waned. Our study has important implications for the petrological monitoring of long-lived arc eruptions. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110068
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: School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, United Kingdom; School of Geosciences, Witwatersand University, Johannesburg, South Africa; Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, United Kingdom; Department of Earth Sciences, University of Durham, Durham, United Kingdom; Montserrat Volcano Observatory, Montserrat; Seismic Research Centre, University of the West Indies St Augustine, Trinidad and Tobago
Recommended Citation:
Plail M.,Edmonds M.,Woods A.W.,et al. Mafic enclaves record syn-eruptive basalt intrusion and mixing[J]. Earth and Planetary Science Letters,2018-01-01,484