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Journal Article
Journal: AAPG Bulletin
Published: 01 January 2018
AAPG Bulletin (2018) 102 (1): 27-47.
...Hongyu Wang; Xuesong Fan; Tailiang Fan; Yunchao Hou ABSTRACT Simple dip areas of continental sedimentary basins feature stratal overlap, gentle changes in slope, uniform dip angles, and minimal fault development. Locating hydrocarbon traps in these environments therefore presents a difficult...
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Journal Article
Journal: Economic Geology
Published: 01 January 2018
Economic Geology (2018) 113 (1): 237-270.
... levels of the Lienetz open pit and reveals a dynamic structural evolution where veins were reactivated but with grossly similar geometries and kinematic histories. Early localized compression is evident from low-angle thrust faults and tensile vein arrays with both subvertical and subhorizontal dips...
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Journal Article
Journal: Economic Geology
Published: 01 November 2017
Economic Geology (2017) 112 (7): 1807-1817.
... of the magnetic grid revealed linear features that are coincident with the surface projection of the gold-bearing veins. Furthermore, dip directions of the magnetic sources were determined using Euler deconvolution, and they were found to coincide with the dip directions of the veins as determined by structural...
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Series: Geological Society, London, Special Publications
Published: 01 January 2017
DOI: 10.1144/SP439.16
EISBN: 9781862399716
... and ultimately to underlapping fault segments. Where fault segments underlap, transfer of displacement between them is accommodated by a connecting monocline. When displacement increases and a through-going fault forms, relay ramps are preserved as fault-bounded zones of elevated bed dip and monoclines...
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Series: Geological Society, London, Special Publications
Published: 01 January 2017
DOI: 10.1144/SP439.12
EISBN: 9781862399716
... gradient (and potential for fault tip folding), displacement partitioning (e.g. synthetic dip, synthetic faulting, fault core displacement), fault core and damage zone width, and fault zone deformation processes. These detailed investigations are progressively dispelling some common myths about normal...
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Series: Geological Society, London, Special Publications
Published: 01 January 2017
DOI: 10.1144/SP439.10
EISBN: 9781862399716
... fractures (mode II) predominate in the shaly units, and they have typically more gentle dips and a larger spread in orientations than extension veins and shear fractures in the limestones. Fracture intensities decrease away from the fault core, but maximum intensities, total number of fractures and widths...
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Series: Geological Society, London, Memoirs
Published: 01 January 2015
DOI: 10.1144/M43.9
EISBN: 9781862397194
... the horseshoe closure (Fig. 9.1 ; Banerjee 1982 ; Saha 1994 ; Bose 2000 , 2009 ). The distinction between the basal lava of the IOG and the Jagannathpur and Malangtoli lavas was made primarily by Saha and co-workers on the fact that, unlike the steep to moderately dipping deformed IOG-lavas, the latter two...
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Series: GSA Special Papers
Published: 01 January 2015
DOI: 10.1130/2015.2509(14)
... km in depth and are in a 1-km-thick zone striking ~036° and dipping ~50°SE, consistent with a 028°, 50°SE main-shock nodal plane having mostly reverse slip. This cluster extends ~10 km along strike. The Quail fault zone projects to the surface in gneiss of the Ordovician Chopawamsic Formation just...
Series: GSA Special Papers
Published: 01 January 2015
DOI: 10.1130/2015.2509(15)
.... The hypocenter locations define a 1–2-km-wide cloud with a strike of ~029° and dip of ~53°E, consistent with the focal mechanism of the main shock. The cloud bends ~5° along strike and has a slightly shallower dip angle below ~6 km depth, indicating a broad, complex fault zone with a slightly concave shape...
Series: GSA Memoirs
Published: 01 January 2014
DOI: 10.1130/2014.1211(05)
... the dip of the age contours, (2) possible vertical components of offsets on faults, and (3) paucity of samples in some areas. Cooling age contours are offset 12 km across the Elsinore fault zone, a figure in keeping with offsets of 10–15 km based on detailed geologic mapping. Likewise, alignment...
Series: GSA Field Guide
Published: 01 January 2014
DOI: 10.1130/2014.0034(05)
EISBN: 9780813756349
... Figure 5-2. Panorama of Sawmill Canyon area in the Saddlebag Lake pendant. Viewpoint is from ridge to the south of Sawmill looking north along the pendant. Red star marks location of Stop 5-1 overview point. White dashed line—steeply dipping unconformity between Mesozoic arc (to left...
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.... The mylonite is foliated with a strike of 030° and dips 30°SE; the Chatham fault strikes 030° and dips 60°SE. The structural trap for uranium mineralization is contained on the east by the Chatham fault and beneath by unmineralized Leatherwood biotite gneiss, which is underlain by the Fork Mountain schist...
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Series: GSA Special Papers
Published: 01 April 2013
DOI: 10.1130/2013.2494(08)
... We describe the structure of the eastern Española Basin and use stratigraphic and stratal attitude data to interpret its tectonic development. This area consists of a west-dipping half graben in the northern Rio Grande rift that includes several intrabasinal grabens, faults, and folds...
Series: GSA Special Papers
Published: 01 April 2013
DOI: 10.1130/2013.2494(16)
Series: GSA Special Papers
Published: 01 October 2012
DOI: 10.1130/2012.2492(14)
...-resolution aerial imagery, a variety of elevation data including airborne LiDAR, and a published geologic map for the area. The comparison between vector-derived strike and dip and traditional field measured strike and dip suggests that remote mapping can successfully capture the regional aspects...
Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2007.2422(08)
... The San Marcos fault is a regional structure in northeast México with a minimum length of 300 km, which separates the Coahuila block from the Coahuila fold belt; the fault dips north-northeast and its trend is west-northwest. The San Marcos fault is a basement structure that has been...
Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2007.2431(03)
... A suite of geophysical data obtained along the Richardson Highway crosses the eastern Alaska Range and Denali fault and reveals the crustal structure of the orogen. Strong seismic reflections from within the orogen north of the Denali fault dip as steeply as 25° north...
Series: GSA Special Papers
Published: 01 January 2006
DOI: 10.1130/2006.2407(04)
... the extension of the former orogenic structure and the onset of arc-parallel strike-slip faulting. The episodic evolution and migration of volcanism are related to changes in dip of the subducting plate. Along-strike segmentation of convergent margin systems and associated mountain chains has...
Series: GSA Special Papers
Published: 01 January 2006
DOI: 10.1130/2006.2408(2.3)
... trigonometric approximations. Rare surface exposures of fracture sets show a polygonal, often rhombohedral, pattern, though in places the pattern is nearly orthogonal or hexahedral. Most fractures are steeply dipping (∼80°), but nearly horizontal fractures are also evident. They display both planar (constant...
Series: GSA Special Papers
Published: 01 January 2006
DOI: 10.1130/2006.2410(06)
...), Saleeby et al. (1982) , Norman (1984) , Blake et al. (1985) , and Yule (1996) . The structure of the Galice Formation where it overlies the Josephine ophiolite is characterized by upright bedding (∼85% of beds), a generally east-dipping bedding-parallel slaty cleavage...
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