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Influence of pyroxene and spinel on the kinetics of peridotite serpentinization
Huang, Ruifang1,2; Song, Maoshuang3; Ding, Xing3; Zhu, Sanyuan4; Zhan, Wenhuan2; Sun, Weidong5,6,7
2017-09-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
Volume122Issue:9Pages:7111-7126
SubtypeArticle
AbstractHydrothermal experiments were performed at 311 degrees C and 3.0 kbar on natural olivine and peridotite to investigate the kinetics of serpentinization. The results show that the rates of reaction strongly depend on grain sizes of solid reactants, with smaller grain sizes resulting in faster kinetics. After 27 days of reaction, the reaction extent was 99% for peridotite with grain sizes of <30 mu m, and the reaction extent was 28% for grain sizes of 100-177 mu m. Compared to peridotite, olivine is serpentinized at much slower rates, e.g., 5.3% of reaction extent was achieved for olivine with grain sizes of 100-177 mu m after 27 days, approximately five times lower than that reached during peridotite serpentinization. Such contrasting results are due to the presence of pyroxene and spinel, an interpretation which is supported by a marked increase in reaction extents for experiments with the addition of pyroxene and spinel. The reaction extent achieved in experiments with 3 wt% spinel greatly increased to 98% after 27 days, much higher than that achieved during olivine serpentinization. These results appear to be related to pyroxene and spinel releasing Al and Cr during serpentinization. As indicated by compositions of serpentine, orthopyroxene lost similar to 60% of Al at a reaction extent of 59%. Influence of Al and Cr is suggested by a dramatic increase in reaction extents with the addition of Al2O3 and Cr2O3 powders. Olivine in natural geological settings is commonly associated with pyroxene and spinel; consequently, serpentinization kinetics may be much faster than previously thought.
KeywordSerpentinization Kinetics Peridotite Spinel Aluminum Chromium
DOI10.1002/2017JB014231
Indexed BySCI
Language英语
WOS IDWOS:000412881700009
Citation statistics
Document Type期刊论文
Version出版稿
Identifierhttp://ir.qdio.ac.cn/handle/337002/143228
Collection深海极端环境与生命过程研究中心
Affiliation1.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangzhou, Guangdong, Peoples R China
2.Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Ocean & Marginal Sea Geol, Guangzhou, Guangdong, Peoples R China
3.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Guangdong, Peoples R China
4.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou, Guangdong, Peoples R China
5.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao, Peoples R China
6.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao, Peoples R China
7.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China
First Author Affilication中国科学院海洋研究所
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GB/T 7714
Huang, Ruifang,Song, Maoshuang,Ding, Xing,et al. Influence of pyroxene and spinel on the kinetics of peridotite serpentinization[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2017,122(9):7111-7126.
APA Huang, Ruifang,Song, Maoshuang,Ding, Xing,Zhu, Sanyuan,Zhan, Wenhuan,&Sun, Weidong.(2017).Influence of pyroxene and spinel on the kinetics of peridotite serpentinization.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,122(9),7111-7126.
MLA Huang, Ruifang,et al."Influence of pyroxene and spinel on the kinetics of peridotite serpentinization".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 122.9(2017):7111-7126.
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