In-situ degassing study on crystal-bearing Stromboli basaltic magmas: Implications for Stromboli explosions

被引：30

作者：

Bai, Liping ^{[1
]}

Baker, Don R. ^{[1
]}

Polacci, Margherita ^{[2
]}

Hill, Reghan J. ^{[3
,4
]}

机构：

[1] McGill Univ, Montreal, PQ H3A 2A7, Canada

[2] Ist Nazl Geofis & Vulcanol, Sez Pisa, I-56126 Pisa, Italy

[3] McGill Univ, Dept Chem Engn, Montreal, PQ H3A 2B2, Canada

[4] McGill Univ, McGill Inst Adv Mat, Montreal, PQ H3A 2B2, Canada

来源：

GEOPHYSICAL RESEARCH LETTERS | 2011年 / 38卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

AEOLIAN ARCHIPELAGO; VOLCANO; DYNAMICS; GAS; PAROXYSMS; BUBBLES; MELTS;

D O I：

10.1029/2011GL048540

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Three-dimensional crystal and bubble sizes and distributions in experimentally produced vesicular crystal-bearing Stromboli basalts and natural scoria were studied with X-ray microtomography (mu CT) at high (1.85 mu m) and low (5.46-9.0 mu m) resolution. The permeabilities from lattice Boltzmann (LB) simulations and experimental measurements are about 1-2 orders of magnitude higher than in aphyric Stromboli basalts at porosity 31.6-55.3%. We propose that the higher permeability in crystal-bearing samples results in highly efficient degassing in shallow, highly porphyritc (HP) magma as opposed to the deeper, aphyric (LP) magma. In paroxysmal explosions, the LP magma flows up in a cylindrical conduit due to the density and viscosity difference between the two magmas. This type of convection can cause the LP magma with exsolved gas to be efficiently transferred through the overlying HP magma, potentially resulting in the more-violent paroxysmal explosions. Citation: Bai, L., D. R. Baker, M. Polacci, and R. J. Hill (2011), In-situ degassing study on crystal-bearing Stromboli basaltic magmas: Implications for Stromboli explosions, Geophys. Res. Lett., 38, L17309, doi:10.1029/2011GL048540.

引用

页数：5

共 22 条

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