DOI: 10.1002/2016GL068283
论文题名: Exchangeable cation composition of the smectite-rich plate boundary fault at the Japan Trench
作者: Kameda J. ; Inaoi C. ; Conin M.
刊名: Geophysical Research Letters
ISSN: 0094-9146
EISSN: 1944-8877
出版年: 2016
卷: 43, 期: 7 起始页码: 3112
结束页码: 3119
语种: 英语
英文关键词: cation exchange
; fault gouge
; smectite
; Tohoku-oki earthquake
Scopus关键词: Chemical analysis
; Chemical reactions
; Earthquakes
; Geophysics
; Ion exchange
; Metallic compounds
; Positive ions
; 2011 Tohoku-Oki earthquakes
; Apparent selectivities
; Cation exchanges
; Fault gouge
; Integrated ocean drilling programs
; Physicochemical process
; Smectites
; Tohoku-Oki earthquakes
; Faulting
英文摘要: To better understand physicochemical processes in smectite-rich fault zones, we examined exchangeable cation composition of samples from the slip zone of the 2011 Tohoku-oki earthquake (Mw9.0) recovered by the Integrated Ocean Drilling Program Expedition 343. Our chemical analyses revealed that the exchangeable Ca2+ and Mg2+ are enriched in the slip zone, while Na+ is depleted. K+ shows a complicated depth profile probably due to K fixation. Based on fluid chemistry data, we estimated apparent selectivity coefficients of exchange reactions in the ternary Ca2+-Mg2+-Na+ system. The results suggest that the Na+ to Mg2+ exchange reaction on smectite might have progressed in the slip zone. One explanation for this feature is local progress of the reaction triggered by coseismic thermogenesis during the earthquake. Considering that the frictional property of smectite gouge is dependent on the exchangeable cation composition, chemical processes as observed in this study are intimately linked to physical aspect of smectite-bearing faults. © 2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84963568229&doi=10.1002%2f2016GL068283&partnerID=40&md5=5778b17abbcb683bfeaaf202ae28fb8e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10109
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Natural History Sciences, Graduate School of Science, Hokkaido University, Sapporo, Japan
Recommended Citation:
Kameda J.,Inaoi C.,Conin M.. Exchangeable cation composition of the smectite-rich plate boundary fault at the Japan Trench[J]. Geophysical Research Letters,2016-01-01,43(7).