CO2-crystal wettability in potassic magmas: implications for eruptive dynamics in light of experimental evidence for heterogeneous nucleation
CO2-crystal wettability in potassic magmas: implications for eruptive dynamics in light of experimental evidence for heterogeneous nucleation
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钾岩浆中的二氧化碳晶体润湿性:根据异质成核的实验证据对喷发动力学的影响
DOI:
10.1093/gji/ggx039
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发表时间:
2017
影响因子:
2.8
通讯作者:
Schmidt B.C.
中科院分区:
文献类型:
--
作者:
Sottili G;Fanara S;Silleni A;Palladino D.M;Schmidt B.C.
The volatile content in magmas is fundamental for the triggering and style of volcanic eruptions. Carbon dioxide, the second most abundant volatile component in magmas after H2O, is the first to reach saturation upon ascent and depressurization. We investigate experimentally CO2-bubble nucleation in trachybasalt and trachyte melts at high temperature and high pressure (HTandHP) through wetting-angle measurements on different (sialic, mafic or oxide) phenocryst phases. The presence of crystals lowers the supersaturation required for CO2-bubble nucleation up to 37 per cent (heterogeneous nucleation,HeN), with a minor role of mineral chemistry. Different from H2O-rich systems, feldspar crystals are effective in reducing required supersaturation for bubble nucleation. Our data suggest that leucite, the dominantliquidusphase in ultrapotassic systems at shallow depth (i.e. <100 MPa), facilitates late-stage, extensive magma vesiculation through CO2HeN, which may explain the shifting of CO2-rich eruptive systems towards an apparently anomalous explosive behaviour.
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影响因子:
2.9
作者:
C. Freda;M. Gaeta;D. Palladino;R. Trigila
通讯作者:
R. Trigila
影响因子:
3.5
作者:
B. Schmidt;F. Holtz;B. Scaillet;M. Pichavant
通讯作者:
M. Pichavant
DOI:
--
发表时间:
1999
期刊:
影响因子:
--
作者:
P. Papale;M. Polacci
通讯作者:
M. Polacci
DOI:
10.1039/b709624k
发表时间:
2007-12
期刊:
Physical chemistry chemical physics : PCCP
影响因子:
--
作者:
Jingwu Yang;J. Duan;D. Fornasiero;J. Ralston
通讯作者:
Jingwu Yang;J. Duan;D. Fornasiero;J. Ralston
影响因子:
3.5
作者:
C. Freda;M. Gaeta;V. Misiti;S. Mollo;D. Dolfi;P. Scarlato
通讯作者:
C. Freda;M. Gaeta;V. Misiti;S. Mollo;D. Dolfi;P. Scarlato