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Abstract
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southward progression
of the deformation front beneath the earlier passive roof thrust.
Very gentle basement dip and almost zero topographic slope in the NPDZ suggest that the Eocambrian salt provides effective decoupling at the present position of the NPDZ. The strong deformation in the NPDZ appears to have developed farther north, in an area where the evaporites may be lacking. Since 2 Ma, the NPDZ moved farther south over the evaporites without further deformation, whereas erosion removed any former topographic slope. Restoring a balanced cross section suggests that the minimum shortening across the NPDZ is more than 55 km. Assuming that this shortening occurred between 5.1 and 2 Ma, the shortening rate is about 18 mm/yr. INTRODUCTION About 3000 km of industry seismic reflection profiles from the SR/PP were provided to Oregon State University by the Oil and Gas Development Corporation (OGDC) and the Ministry of Petroleum and Natural Resources of Pakistan. These data, along with surface geologic, well, and gravity data, were used to construct the regional cross sections of the western, central, and eastern SR/PP (Baker, 1987; Leathers, 1987; Pennock, 1988) (Figure 1B). The same data set was used by Jaumé (1986) to study the mechanics of thrusting in the SR/PP, and by Duroy (1986) to analyze lithospheric flexure in |
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