DOI: 10.1038/ngeo2951
论文题名: Quasi-equilibrium melting of quartzite upon extreme friction
作者: Lee S.K. ; Han R. ; Kim E.J. ; Jeong G.Y. ; Khim H. ; Hirose T.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 6 起始页码: 436
结束页码: 441
语种: 英语
Scopus关键词: disequilibrium
; fault plane
; friction
; low temperature
; melting
; quartz
; quartzite
; temperature effect
英文摘要: The friction on fault planes that controls how rocks slide during earthquakes decreases significantly as a result of complex fault-lubrication processes involving frictional melting. Fault friction has been characterized in terms of the preferential melting of minerals with low melting points-so-called disequilibrium melting. Quartz, which has a high melting temperature of about 1,726 °C and is a major component of crustal rocks, is not expected to melt often during seismic slip. Here we use high-velocity friction experiments on quartzite to show that quartz can melt at temperatures of 1,350 to 1,500 °C. This implies that quartz within a fault plane undergoing rapid friction sliding could melt at substantially lower temperatures than expected. We suggest that depression of the melting temperature is caused by the preferential melting of ultra-fine particles and metastable melting of β-quartz at about 1,400 °C during extreme frictional slip. The results for quartzite are applicable to complex rocks because of the observed prevalence of dynamic grain fragmentation, the preferential melting of smaller grains and the kinetic preference of β-quartz formation during frictional sliding. We postulate that frictional melting of quartz on a fault plane at temperatures substantially below the melting temperature could facilitate slip-weakening and lead to large earthquakes. © 2017 Macmillan Publishers Limited, part of Springer Nature. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105768
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea; Department of Geology, Research Institute of Natural Science, Gyeongsang National University, Jinju, South Korea; Department of Earth and Environmental Sciences, Andong National University, Andong, South Korea; Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology, Kochi, Japan
Recommended Citation:
Lee S.K.,Han R.,Kim E.J.,et al. Quasi-equilibrium melting of quartzite upon extreme friction[J]. Nature Geoscience,2017-01-01,10(6)