Effect of pressure on the kinetics of peridotite serpentinization

doi:10.1007/s00269-020-01101-x

	Effect of pressure on the kinetics of peridotite serpentinization
	Huang, Ruifang 1; Sun, Weidong2 ; Ding, Xing 3; Zhao, Yusheng 1; Song, Maoshuang 3
	2020-07-04
Source Publication	PHYSICS AND CHEMISTRY OF MINERALS
ISSN	0342-1791
Volume	47 Issue:7 Pages:14
Corresponding Author	Huang, Ruifang(huangrf@sustech.edu.cn)
Abstract	The kinetics of serpentinization were investigated at 400-500 degrees C and 3.0-20 kbar using natural olivine and peridotite for run durations of 9-38 days. The serpentine varieties were lizardite for all the experiments. The serpentinization kinetics at 400 degrees C and 3.0 kbar and at 500 degrees C and 20 kbar displayed a sigmoidal kinetic behavior, with very sluggish reaction rates at the early stage of serpentinization, followed by a sudden increase in the reaction rates. They were 1-2 orders of magnitude faster than serpentinization kinetics commonly used for modeling serpentinization-related processes. Pressure greatly increases the rates of peridotite serpentinization at 500 degrees C, e.g., 19% of reaction extent was achieved within 20 days for experiments at 500 degrees C and 3.0 kbar with starting grain sizes of < 30 mu m, which increased to 96% for experiments at 500 degrees C and 20 kbar over the same period. Compared to olivine, peridotite was serpentinized at much faster rates at 400-500 degrees C and 3.0 kbar, reflecting the influence of pyroxene and spinel. Pyroxene minerals released some of its SiO(2)during serpentinization, which was involved in the serpentinization of olivine, supported by larger amounts of SiO(2)in olivine-derived serpentine compared to those of primary olivine. Thermodynamic calculations suggest that Gibbs energy of olivine hydrolysis decreases greatly with increasing pressures, and it becomes negative at 400-500 oC and 3.0-20 kbar with the involvement of silica. The experimental results of this study may be applied to natural geological settings where abundant H2O is present.
Keyword	Serpentinization kinetics Pyroxene Silica Aluminum
DOI	10.1007/s00269-020-01101-x
Indexed By	SCI
Language	英语
Funding Project	Natural Science Foundation of China[41873069] ; Natural Science Foundation of China[41603060] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA22050103] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42000000] ; National Key R&D Program of China[2016YFC0600408]
WOS Research Area	Materials Science ; Mineralogy
WOS Subject	Materials Science, Multidisciplinary ; Mineralogy
WOS ID	WOS:000545209200001
Publisher	SPRINGER
Citation statistics
Document Type	期刊论文
Identifier	http://ir.qdio.ac.cn/handle/337002/167850
Collection	深海极端环境与生命过程研究中心
Corresponding Author	Huang, Ruifang
Affiliation	1.Southern Univ Sci & Technol, SUSTech Acad Adv Interdisciplinary Studies, Shenzhen 518055, Peoples R China 2.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao 266071, Peoples R China 3.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
Recommended Citation GB/T 7714	Huang, Ruifang,Sun, Weidong,Ding, Xing,et al. Effect of pressure on the kinetics of peridotite serpentinization[J]. PHYSICS AND CHEMISTRY OF MINERALS,2020,47(7):14.
APA	Huang, Ruifang,Sun, Weidong,Ding, Xing,Zhao, Yusheng,&Song, Maoshuang.(2020).Effect of pressure on the kinetics of peridotite serpentinization.PHYSICS AND CHEMISTRY OF MINERALS,47(7),14.
MLA	Huang, Ruifang,et al."Effect of pressure on the kinetics of peridotite serpentinization".PHYSICS AND CHEMISTRY OF MINERALS 47.7(2020):14.

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