DOI: 10.1002/grl.50829
论文题名: Phyllosilicates formation in faults rocks: Implications for dormant fault-sealing potential and fault strength in the upper crust
作者: Cavailhes T. ; Soliva R. ; Labaume P. ; Wibberley C. ; Sizun J.-P. ; Gout C. ; Charpentier D. ; Chauvet A. ; Scalabrino B. ; Buatier M.
刊名: Geophysical Research Letters
ISSN: 0094-8631
EISSN: 1944-8362
出版年: 2013
卷: 40, 期: 16 起始页码: 4272
结束页码: 4278
语种: 英语
英文关键词: diagenesis
; micas
; permeability
; sandstone
; Shale Gouge
; strength
Scopus关键词: diagenesis
; Fault strength
; Mechanical behavior
; Microstructural analysis
; Normal fault zones
; Primary control
; strength
; Transformation ratio
; Feldspar
; Mechanical engineering
; Mechanical permeability
; Mica
; Sandstone
; Sedimentology
; Shale
; Silicates
; diagenesis
; fault
; feldspar
; mica
; phyllosilicate
; prediction
; sandstone
; seismograph
; shale
; transformation
; upper crust
; Micas
英文摘要: Phyllosilicate content and related permeability of fault zones form primary controls on hydraulic and mechanical behavior of the brittle crust. Hence, understanding and predicting the localization of these ubiquitous minerals is a major issue for fundamental and applied geosciences. We describe normal fault zones cutting a foreland arkosic turbiditic formation suffering high-T diagenesis and formed under conditions (~200°C) typical of deeply buried reservoirs and common within the seismogenic interval. Microstructural analyses show a large proportion of phyllosilicates (up to 34%) in the fault rock, derived from near-complete feldspar alteration and disaggregation during deformation. This study shows that even faults with offsets (~20 cm) much lower than bed thickness can have such large feldspar-to-phyllosilicate transformation ratios, implying that the origin of the phyllosilicates is purely transformation related. These results imply that the potential sealing capacity and strength of faults could be predicted from the host rock feldspar content. Where sealing capacity and fault strength can be related to phyllosilicate content, these properties can then also be inferred from the predicted phyllosilicate content: this opens up new horizons concerning the hydraulic and the mechanical behavior of the upper crust. Key Points first quntification of phyllosilicates formation Shale Gouge ratio has to be modified in deeply buried reservoir Feldspar content of host rock as a predictive proxy. © 2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84883080699&doi=10.1002%2fgrl.50829&partnerID=40&md5=8777131bb689fcf57af0780dd96abc5b
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5895
Appears in Collections: 气候减缓与适应
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作者单位: Géosciences Montpellier, UMR 5243, Université Montpellier 2-CNRS, Montpellier cedex 5, France
Recommended Citation:
Cavailhes T.,Soliva R.,Labaume P.,et al. Phyllosilicates formation in faults rocks: Implications for dormant fault-sealing potential and fault strength in the upper crust[J]. Geophysical Research Letters,2013-01-01,40(16).