Ultralow viscosity of carbonate melts at high pressures

被引：140

作者：

Kono, Yoshio ^{[1
]}

Kenney-Benson, Curtis ^{[1
]}

Hummer, Daniel ^{[2
]}

Ohfuji, Hiroaki ^{[3
]}

Park, Changyong ^{[1
]}

Shen, Guoyin ^{[1
]}

Wang, Yanbin ^{[4
]}

Kavner, Abby ^{[2
]}

Manning, Craig E. ^{[2
]}

机构：

[1] Carnegie Inst Sci, HPCAT, Geophys Lab, Argonne, IL 60439 USA

[2] Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA 90095 USA

[3] Ehime Univ, Geodynam Res Ctr, Matsuyama, Ehime 7908577, Japan

[4] Univ Chicago, Ctr Adv Radiat Sources, GeoSoilEnviroCARS, Chicago, IL 60637 USA

来源：

NATURE COMMUNICATIONS | 2014年 / 5卷

关键词：

ELASTIC-WAVE VELOCITY; EAST PACIFIC RISE; ELECTRICAL-CONDUCTIVITY; UPWELLING MANTLE; BENEATH; EXTRACTION; LIQUID; GPA; GEOCHEMISTRY; DYNAMICS;

D O I：

10.1038/ncomms6091

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Knowledge of the occurrence and mobility of carbonate-rich melts in the Earth's mantle is important for understanding the deep carbon cycle and related geochemical and geophysical processes. However, our understanding of the mobility of carbonate-rich melts remains poor. Here we report viscosities of carbonate melts up to 6.2 GPa using a newly developed technique of ultrafast synchrotron X-ray imaging. These carbonate melts display ultralow viscosities, much lower than previously thought, in the range of 0.006-0.010 Pa s, which are similar to 2 to 3 orders of magnitude lower than those of basaltic melts in the upper mantle. As a result, the mobility of carbonate melts (defined as the ratio of melt-solid density contrast to melt viscosity) is similar to 2 to 3 orders of magnitude higher than that of basaltic melts. Such high mobility has significant influence on several magmatic processes, such as fast melt migration and effective melt extraction beneath mid-ocean ridges.

引用

页数：8

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