Download e-book for kindle: 3-D structural geology : a practical guide for surface and by Richard H. Groshong

By Richard H. Groshong

The e-book comprises new fabric, specifically examples of three-D types and strategies for utilizing kinematic versions to foretell fault and ramp-anticline geometry. The publication is aimed toward the pro person all for the accuracy of an interpretation and the rate with which it may be received from incomplete facts. a number of analytical options are provided that will 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

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B Draped deposition parallel to a topographic slope. c Primary topography associated with clinoform deposition Fig. 7. Cross sections showing primary sedimentary facies relationships and maximum flooding surface. All time lines are horizontal in this example 5 6 Chapter 1 · Elements of Map-Scale Structure Fig. 8. Unconformity types. The unconformity (heavy line) is the contact between the older, underlying shaded units and the younger, overlying unshaded units. a Angular unconformity. b Buttress or onlap unconformity.

Finding the intersection between two surfaces is a fundamental technique in three-dimensional interpretation. In Sect. 1, three points along the outcrop trace of a planar geological contact were used to generate a structure-contour map. Conversely, the outcrop trace of a contact can be determined from a structure contour map. The following procedure works for both plane and curved structure contour surfaces. The structure contour map is superimposed on the topographic map (Fig. 25a). All intersection points where both surfaces have 55 56 Chapter 2 · Location and Attitude Fig.

This book presents methods for extracting the most three-dimensional interpretive information out of local observations and for using this information to build a three-dimensional interpretation of the whole structure. Fig. 2. Structure contours. a Lines of equal elevation on the surface of a map unit. b Lines of equal elevation projected onto a horizontal surface to make a structure contour map Fig. 3. Structure contour map of the faulted upper horizon from Fig. 1. Contours are at 50 ft intervals, with negative elevations being below sea level.

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