气候变化领域集成服务门户(CCPortal): Stress-state differences between sedimentary cover and basement of the Songliao Basin, NE China: In-situ stress measurements at 6–7 km depth of an ICDP Scientific Drilling borehole (SK-II)

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DOI	10.1016/j.tecto.2020.228337
	Stress-state differences between sedimentary cover and basement of the Songliao Basin, NE China: In-situ stress measurements at 6–7 km depth of an ICDP Scientific Drilling borehole (SK-II)
	Wang B.; Sun D.; Chen Q.; Lin W.; Li A.-W.; Cao H.
发表日期	2020
ISSN	00401951
卷号	777
英文摘要	The stress state down to the basement within sedimentary basins yet remains poorly understood. The anelastic strain recovery (ASR) method was employed to measure the stress state in the SK-II borehole in the Songliao Basin, Northeast China. The results show that the stress state differs significantly between the sedimentary cover and basement. In the sedimentary cover (6296–6335 m), the maximum principal stress σ1 is nearly vertical, which is in the normal faulting stress regime dominated by gravitation, in accordance with the normal faults observed on seismic reflection profiles within the sedimentary cover. In contrast, the basement (6646–6846 m) shows that σ1 is nearly horizontal, suggesting a strike-slip or reverse-faulting regime. The stress state of the basement is close to the reasonable stress condition for the Eurasian Plate far from a western Pacific plate subduction zone and consistent with the focal mechanisms of earthquakes (7–15 km) in the vicinity of ICDP SK-II borehole. The difference of stress state may imply that the far-field stress generated by the western Pacific plate has limited effects on the sedimentary cover, an increase in thickness correlates with an increasing influence of tectonic stress with depth. © 2020 Elsevier B.V.
关键词	Anelastic strain recovery method In-situ stress SK-II borehole Songliao Basin Stress state difference
英文关键词	Boreholes; Buildings; Sedimentology; Stresses; Strike-slip faults; Anelastic strain recovery; In-situ stress measurement; Insitu stress; Maximum principal stress; Scientific drilling; Seismic reflection profiles; Songliao basin; Stress state; Fault slips; anelasticity; basement rock; borehole; depth; drilling; in situ measurement; normal fault; Pacific plate; sedimentary basin; seismic reflection; strain analysis; stress field; China; Songliao Basin
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/207893
作者单位	Key Laboratory of Active Tectonics and Crustal Stability Assessment, Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081, China; Graduate School of Engineering, Kyoto University, Kyoto, 615-8540, Japan
推荐引用方式 GB/T 7714	Wang B.,Sun D.,Chen Q.,等. Stress-state differences between sedimentary cover and basement of the Songliao Basin, NE China: In-situ stress measurements at 6–7 km depth of an ICDP Scientific Drilling borehole (SK-II)[J],2020,777.
APA	Wang B.,Sun D.,Chen Q.,Lin W.,Li A.-W.,&Cao H..(2020).Stress-state differences between sedimentary cover and basement of the Songliao Basin, NE China: In-situ stress measurements at 6–7 km depth of an ICDP Scientific Drilling borehole (SK-II).Tectonophysics,777.
MLA	Wang B.,et al."Stress-state differences between sedimentary cover and basement of the Songliao Basin, NE China: In-situ stress measurements at 6–7 km depth of an ICDP Scientific Drilling borehole (SK-II)".Tectonophysics 777(2020).