NDLI: Hugoniot and sound velocity of antigorite and evidence for sluggish decomposition

Content Provider	Springer Nature Link
Author	Zhang, Youjun Sekine, Toshimori Yu, Yin He, Hongliang Meng, Chuanmin Liu, Fusheng Zhang, Mingjian
Copyright Year	2013
Abstract	Antigorite is one kind of hydrous serpentine that is present in meteorites and in the Earth mantle. In order to understand its dynamic behaviors, metastability and decomposition, shock experiments on antigorite have been conducted using a two-stage gas gun, and wave profiles of particle velocities have been measured to obtain the Hugoniot up to ~130 GPa and sound velocity at high pressures. The results show three regions of low-pressure phase below ~43 GPa and its metastable extension above a pressure of ~43 GPa for short durations of shock and high-pressure phase(s) above a pressure of ~43 GPa for long durations of shock. The dynamic behaviors of antigorite depend on not only the pressure but also the compression duration. Metastable extension state indicates that antigorite may survive beyond the stability depending on the shock conditions. Shock temperatures for antigorite are calculated along the Hugoniot. The pressure–density, sound velocity–pressure and shock temperature–pressure plots demonstrate that the decomposition reaction of antigorite into high-pressure phase(s) is accompanied by a volume expansion, sound velocity increase and temperature decrease, relative to the metastable extension phase above ~43 GPa. The decomposition should be sluggish and needs enough reaction time to complete and to overcome the activation energy. As a result of the high metastability of antigorite and possible decomposition assemblages, the hydrous serpentine (antigorite) may play a crucial role for the origin of water during the Earth accretion.
Starting Page	313
Ending Page	322
Page Count	10
File Format	PDF
ISSN	03421791
Journal	Physics and Chemistry of Minerals
Volume Number	41
Issue Number	5
e-ISSN	14322021
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-01-04
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Antigorite Shock compression Equation of state Sound velocity Decomposition Mineralogy Crystallography Geochemistry Mineral Resources
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Materials Science

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