DOI: 10.1016/j.epsl.2017.10.051
Scopus记录号: 2-s2.0-85033597248
论文题名: Active tectonics around the Yakutat indentor: New geomorphological constraints on the eastern Denali, Totschunda and Duke River Faults
作者: Marechal A. ; Ritz J.-F. ; Ferry M. ; Mazzotti S. ; Blard P.-H. ; Braucher R. ; Saint-Carlier D.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 482 起始页码: 71
结束页码: 80
语种: 英语
英文关键词: active tectonics
; Duke River Fault
; eastern Denali Fault
; slip rates
; Totschunda Fault
; Yakutat collision
Scopus关键词: Deformation
; Faulting
; Rivers
; Strike-slip faults
; Tectonics
; Active tectonics
; Cosmogenic nuclide dating
; Denali fault
; Digital elevation model
; Distributed deformation
; Geomorphological analysis
; Slip rates
; Yakutat collision
; Fault slips
; active fault
; collision zone
; deformation
; geomorphology
; slip rate
; tectonics
; thrust fault
; vertical movement
; Alaska
; Canada
; Denali Fault Zone
; Duke River
; United States
; Yakutat
; Yukon Territory
英文摘要: The Yakutat collision in SE Alaska – SW Yukon is an outstanding example of indentor tectonics. The impinging Yakutat block strongly controls the pattern of deformation inland. However, the relationship between this collision system and inherited tectonic structures such as the Denali, Totschunda, and Duke River Faults remains debated. A detailed geomorphological analysis, based on high-resolution imagery, digital elevation models, field observations, and cosmogenic nuclide dating, allow us to estimate new slip rates along these active structures. Our results show a vertical motion of 0.9 ± 0.3 mm/yr along the whole eastern Denali Fault, while the dextral component of the fault tapers to less than 1 mm/yr ∼80 km south of the Denali–Totschunda junction. In contrast, the Totschunda Fault accommodates 14.6 ± 2.7 mm/yr of right-lateral strike-slip along its central section ∼100 km south of the junction. Further south, preliminary observations suggest a slip rate comprised between 3.5 and 6.5 mm/yr along the westernmost part of the Duke River thrust fault. Our results highlight the complex partitioning of deformation inland of the Yakutat collision, where the role and slip rate of the main faults vary significantly over distances of ∼100 km or less. We propose a schematic model of present-day tectonics that suggests ongoing partitioning and reorganization of deformation between major inherited structures, relay zones, and regions of distributed deformation, in response to the radial stress and strain pattern around the Yakutat collision eastern syntaxis. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110125
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Geosciences Montpellier, UMR5243, Université de Montpellier – CNRS, Place E. Bataillon, Montpellier, 34 095, France; School of Earth and Ocean Sciences, University of Victoria, Victoria, BC, Canada; Centre de Recherches Pétrographiques et Géochimiques, rue Notre Dame des Pauvres, Vandoeuvre les Nancy, 54 500, France; CEREGE, UMR7330, Laboratoire des Nucléides Cosmogéniques, Plateau d'Arbois, Aix-en-Provence, 13 545, France
Recommended Citation:
Marechal A.,Ritz J.-F.,Ferry M.,et al. Active tectonics around the Yakutat indentor: New geomorphological constraints on the eastern Denali, Totschunda and Duke River Faults[J]. Earth and Planetary Science Letters,2018-01-01,482