By Richard H. Groshong
The ebook contains new fabric, particularly examples of 3-D versions and methods for utilizing kinematic types to foretell fault and ramp-anticline geometry. The ebook is aimed toward the pro consumer curious about the accuracy of an interpretation and the rate with which it may be got from incomplete facts. a variety of analytical recommendations are on condition that may be simply carried out with a pocket calculator or a spreadsheet.
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Extra info for 3-D structural geology : a practical guide for surface and subsurfaces map interpretation
24. 2 Structure Contours from Attitude If the dip is known, then the spacing between structure contours is found from the method of Eq. 11 (Fig. 21) where H = horizontal spacing between structure contours measured perpendicular to the contour strike, I = contour interval, and δ = dip. The trend of the structure contours is perpendicular to the dip direction. 3 Dip from Structure Contours If the attitude is given by structure contours, the dip is found by solving Eq. 22) where δ = dip, I = contour interval, and H = spacing between contours.
Intrusive material is patterned and lines represent layering in the country rock. a Concordant. b Discordant A vein is a relatively thin, normally tabular, rock mass of distinctive lithologic character, usually crosscutting the structure of the host rock. Many veins are depositional and represent the filling of a fracture, whereas others are the result of replacement of the country rock. Veins are mentioned here with intrusions because the contact relationships and unit geometries may be similar to those of some intrusions.
3-D oblique view of a portion of the Black Warrior Basin, Alabama (data from Groshong et al. 2003b), viewed to the NW. Thin vertical lines are wells, semi-transparent surfaces outlined in black are faults 2 Chapter 1 · Elements of Map-Scale Structure a mental and physical picture of the structure in three dimensions. The best interpretations utilize the constraints provided by all the data in three dimensions. The most complete interpretation would be as a three-dimensional solid, an approach possible with 3-D computer graphics programs.
3-D structural geology : a practical guide for surface and subsurfaces map interpretation by Richard H. Groshong