DOI: 10.1016/j.tecto.2020.228399
论文题名: The effects of a tectonic stress regime change on crustal-scale fluid flow at the Heyuan geothermal fault system, South China
作者: Tannock L. ; Herwegh M. ; Berger A. ; Liu J. ; Regenauer-Lieb K.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 781 语种: 英语
中文关键词: Fracture analysis
; Giant quartz-reef formation
; Hydrothermal fluid flow
; Mineralization
; Multiscale analysis
; Tectonic evolution
英文关键词: Fracture
; Hot springs
; Quartz
; Reefs
; Strike-slip faults
; Fracture analysis
; Giant quartz-reef formation
; Hydrothermal fluids
; Mineralization
; Multi scale analysis
; Tectonic evolution
; Flow of fluids
; crustal structure
; fault zone
; fluid flow
; fracture network
; geothermal system
; mineralization
; quartz
; stress analysis
; tectonic evolution
; transpression
; China
英文摘要: The South China, Heyuan Fault Zone provides unique crustal exposure to study the meso- macroscale architecture of evolving fracture networks in response to a change in tectonic stress regime and associated changing fluid flow pathways. Multiple generations of fracturing across the fault zone reveal its structural evolution related to the change in stress regime from extensional (since the Mesozoic) to transpressive (in the Cenozoic), which coincides with generations of growth and fracturing on the microscale. Low angle, mode-I fractures, quartz veining, and a giant quartz reef (>75 m wide and 40 km long) were formed due to a combination of chemo-mechanical mechanisms, including a crucial phyllonite ‘cap rock’, during the extensional phase. This evolved through to a predominately sub-vertically aligned, shear fracture network, exhibiting only minor quartz precipitation. These open fractures are attributed to the transpressive regime experienced since the Cenozoic, in which strike-slip faults cross-cut the Heyuan Fault. We propose that this sub-vertical fracture network provides the fluid flow pathway supplying the present-day hot springs by penetrating through the phyllonite seal, which previously enabled SiO2 accumulation. Additionally, further quartz-reef building would likely be reduced due to (i) lack of seal integrity, and (ii) an unfavourable tectonic setting to channel the flow and provide accommodation space. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170719
Appears in Collections: 气候变化与战略
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作者单位: School of Minerals and Energy Resources Engineering, University of New South Wales, Sydney, NSW 2052, Australia; Institute of Geological Sciences, University of Bern, Switzerland; School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou, Guangdong, China
Recommended Citation:
Tannock L.,Herwegh M.,Berger A.,et al. The effects of a tectonic stress regime change on crustal-scale fluid flow at the Heyuan geothermal fault system, South China[J]. Tectonophysics,2020-01-01,781