Geophysics

Balanced Geological Cross-Sections: An Essential Technique by Nicholas B. Woodward

By Nicholas B. Woodward

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Published by way of the yankee Geophysical Union as a part of the Short classes in Geology Series.

The first version of those brief direction notes used to be ready by way of Woodward and Boyer for the SE part assembly of the Geological Society of the US held in Knoxville, Tennessee, March 1985, and released as Dept. of Geol. Sci. reviews in Geology, v. eleven. The Structural Geology and Tectonics department of the GSA as a result invited Woodward, Boyer and Suppe to provide a day brief path on the nationwide Geological Society of the USA assembly in Orlando, Florida, November 1985 (v. eleven, 2d edition). we're super happy in order to perform the foreign Geological Congress and feature thoroughly revised the current direction notes.

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Extra info for Balanced Geological Cross-Sections: An Essential Technique in Geological Research and Exploration

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D. Harris, 1970, ( c ) Wiley-Interscience] . WOODWARDETAL Session 3 AS was illustrated in Figures 2-1 and 2-3 thrust surfaces are stepped in three dimensions. There is a systematic change in stratigraphic separation (Fig. 3-1, A on A, A on B, A on C, B on C, C on C) across the fault from a basal flat to the ramp and onto the next flat horizon. Stratigraphic separation changes longitudinally across lateral ramps in a fault surface as well. Stratigraphic separation diagrams plot the hanging wall stratigraphic unit versus the footwall stratigraphic unit on a geographic base (Fig.

There is no published data showing the exact displacement of the Lewis thrust sheet, but published seismic data indicate that the displacement exceeds 40 kilmeters. 40 20 I rn d (kml - m 100 80 60 51 40 L o (km) 1 20 1 0 0 Fig. 7 13 Plots of thrust displacement versus position [from Boyer and Geiser, 19871; based on A. Bally and others [1966; Plate 1, section B-8'1 and B. Gordy and others [1977; Fig. 11, bottom section] 52 BALANCED GEOLOGICAL CROSS SECTIONS Session 8 Boieetine Folds To WD# The fold in Figure 8-1 has been projected into the air and into the subsurface using the Busk [I9291 method.

These are descriptive terms and 36 BALANCED GEOLOGICAL CROSS SECTIONS are not meant to imply a sequence of timing. It has been commonly suggested that leading imbricate fans develop in a "break-back" sequence, whereas trailing imbricate fans form in a hinterland-toforeland sequence [Dahlstrom, 19701. It should be noted that after erosion the tips of blind thrusts [Boyer and Elliott, 1982, fig. 111 and the roof thrusts of duplexes [Boyer, 1978, p. 361 may have been eroded so that both will have the map pattern of an emergent imbricate fan.

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