气候变化领域集成服务门户(CCPortal): The effects of a tectonic stress regime change on crustal-scale fluid flow at the Heyuan geothermal fault system, South China

CCPortal

DOI	10.1016/j.tecto.2020.228399
	The effects of a tectonic stress regime change on crustal-scale fluid flow at the Heyuan geothermal fault system, South China
	Tannock L.; Herwegh M.; Berger A.; Liu J.; Regenauer-Lieb K.
发表日期	2020
ISSN	00401951
卷号	781
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.
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
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207886
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
推荐引用方式 GB/T 7714	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],2020,781.
APA	Tannock L.,Herwegh M.,Berger A.,Liu J.,&Regenauer-Lieb K..(2020).The effects of a tectonic stress regime change on crustal-scale fluid flow at the Heyuan geothermal fault system, South China.Tectonophysics,781.
MLA	Tannock L.,et al."The effects of a tectonic stress regime change on crustal-scale fluid flow at the Heyuan geothermal fault system, South China".Tectonophysics 781(2020).