DOI: 10.1016/j.tecto.2019.228313
论文题名: Fault development in transtension, McCully gas field, New Brunswick, Canada
作者: Kugler J. ; Waldron J.W.F. ; Durling P.W.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2020
卷: 776 语种: 英语
中文关键词: Atlantic Canada
; Faults
; Maritimes Basin
; Strain
; Strike slip
; Transtension
英文关键词: Deformation
; Deposition
; Faulting
; Flow of fluids
; Gas industry
; Geophysical prospecting
; Seismic response
; Seismic waves
; Strain
; Strike-slip faults
; Atlantic Canada
; Extensional faults
; Fault development
; Maritimes Basin
; Seismic deformation
; Strike slip
; Strike-slip component
; Transtension
; Fault slips
; deformation
; deposition
; fault zone
; gas field
; geophysical array
; seismic data
; strain rate
; strike-slip fault
; transtension
; Canada
; Maritime Provinces
; New Brunswick
英文摘要: In the Mississippian Moncton Sub-basin, New Brunswick, Canada, 3D seismic data reveal structure within the McCully gas field. The asymmetric basin, elongated NE–SW, is bounded to the SE and NW by major dextral fault zones. Curved en-echelon extensional faults strike ESE–WNW. Gentle folds trend NE–SW. Contractional faults show varied orientations. These features are all consistent with deformation of the basin in an environment of dextral transtension. Analogous faults in outcrops, ~13 km to the SW, constrain sub-seismic deformation, and show that deformation occurred soon after deposition, before complete lithification. Strike-slip basins undergo concurrent extension, contraction, and rotation producing complex kinematic history which can be unraveled using the heaves and orientations of fault arrays. Based on measurements from the 3D data set, a horizon in the gas field displays an apparent stretch of ~1.14, and a perpendicular apparent shortening of ~0.976. Faults are oriented, on average, at ~40° to the shear zone boundary. These values show that the basin was deformed in transtension with overall angle of transtension alpha ≈47° to 50°. However, part of this deformation post-dated the overlying Sussex Group. Removal of this component suggests alpha was in the range 62–65° during deposition of the Horton Group. Variations across the shear zone indicate that deformation was heterogeneous in space and time: an initial large strike-slip component transitioned to more divergent deformation as the deformation zone widened. Fault curvature likely reflects propagation during development of these heterogeneities. Overall, the deformation reflects an oblique-rift environment with ~N–S extension, that developed between major dextral strike-slip faults. These results show that with 3D seismic data sets it is possible to reconstruct details of strain history in transtensional basins that are potentially useful for understanding basin compartmentalization and fluid flow over time. © 2019 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170629
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada; Geological Survey of Canada (Atlantic), Bedford Institute of Oceanography, P.O. Box 1006, Dartmouth, Nova Scotia B2Y 4A2, Canada
Recommended Citation:
Kugler J.,Waldron J.W.F.,Durling P.W.. Fault development in transtension, McCully gas field, New Brunswick, Canada[J]. Tectonophysics,2020-01-01,776