DOI: 10.1306/02271211140
Scopus记录号: 2-s2.0-84867643696
论文题名: Controb of basement faults on the geometry and evolution of compressional basement-involved structures
作者: Paul D. ; Mitra S.
刊名: AAPG Bulletin
ISSN: 0149-1731
EISSN: 1558-9461
出版年: 2012
发表日期: 2012
卷: 96, 期: 10 起始页码: 1899
结束页码: 1930
语种: 英语
Scopus关键词: Adjacent structures
; Basement faults
; Compressional
; Experimental models
; Fault set
; Fault trend
; Fold-thrust belts
; Hamiltons
; Laser scanning
; Natural structures
; Planar discontinuity
; Relative orientation
; Reverse faults
; Rocky Mountains
; Sedimentary covers
; Soft clays
; Strike slip faulting
; Subsurface structures
; Surface modeling
; Threedimensional (3-d)
; Transfer zones
; Wyoming
; Buildings
; Domes
; Faulting
; Geologic models
; Geometry
; Landforms
; Ships
; Surface structure
; Three dimensional
; basement rock
; compressibility
; deformation mechanism
; discontinuity
; fault
; fold and thrust belt
; foreland basin
; geometry
; strike-slip fault
; three-dimensional modeling
; Rocky Mountains
; United States
; Wyoming
; Ovis aries
Scopus学科分类: Energy
; Earth and Planetary Sciences
英文摘要: Foreland basement-involved structures commonly occur in front of major fold-thrust belts as irregular chains of uplifts. The variation in the map and three-dimensional (3-D) geometries of individual structures, and their mutual spatial and angular relationships, are strongly suggestive of the influence of preexisting basement discontinuities. Three-dimensional experimental models were constructed to determine the function of preexisting frontal and lateral discontinuities in determining the geometry of the structures. The models consisted of two layers, with stiff clay representing the basement and soft clay representing the sedimentary cover. Laser scanning and 3-D surface modeling were used to determine the map geometry to compare the models with examples of natural structures from the Rocky Mountain foreland in Wyoming. Planar discontinuities result in doubly plunging structures terminating against a frontal fault with a linear trace (Sheep Mountain anticline), whereas intersecting fault sets with sharp or curved intersections result in trapdoor geometries (Grass Creek anticline). Opposite-dipping faults result in uplifted blocks with varying relief and orientations of the structures, depending on the relative orientations of the two fault trends. Significant strikeslip faulting along the frontal fault only occurs when the angle between the two fault trends exceeds 30°. Chains of structures show offsets or relay patterns, commonly accompanied by changes in the orientations of adjacent structures. The Sage Creek-Steamboat Butte chains, the Hamilton Dome-Wagonhound anticline chain, the Maverick Springs-Circle Ridge chain, and the Grass Creek-Walker Dome trend in the Rocky Mountain foreland are examples of these configurations. These patterns suggest the influence of preexisting frontal or lateral discontinuities on the trends and locations of structures. Lateral discontinuities are either preexisting, controlling the lateral extent of structures, or form during deformation to accommodate the formation of structures formed along offset frontal faults. Preexisting lateral faults that penetrate the entire basement commonly result in surface lateral faults bounding the surface structures. However, reverse faults in the basement connected by buried lateral faults result in surface structures with overlaps between them. A relay of reverse faults in the basement not connected by lateral faults may develop parallel or oblique structures with transfer zones between them. The mapped geometries of the experimental models, and the orientations of secondary faults, provide predictive analogs that can be used in the interpretation of surface and subsurface structures. © 2012. The American Association of Petroleum Geologists. All rights reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84867643696&doi=10.1306%2f02271211140&partnerID=40&md5=b64020f93e5a5f6ac5f9d36592c99563
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/13301
Appears in Collections: 过去全球变化的重建 影响、适应和脆弱性 科学计划与规划 气候变化与战略 全球变化的国际研究计划 气候减缓与适应 气候变化事实与影响
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Recommended Citation:
Paul D.,Mitra S.. Controb of basement faults on the geometry and evolution of compressional basement-involved structures[J]. AAPG Bulletin,2012-01-01,96(10)