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《Geoscience》 2006-01
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Fractal Theory Applied to the Study of Cross-section Shortening Amount in Northern Thrust-nappe Belt of the Western Ordos Basin

YANG Sheng-bin~(1,2),HOU Gui-ting~(1),GUO Qing-yin~(2,3),PAN Li-yin~(4),SUN Ye~(3)(1.School of Earth and Space Sciences,Peking University,Beijing 100871,China;2.Beijing Research Institute of Uranium Geology,CNNC,Beijing 100029,China;3.School of Earth Sciences & Resources,China University of Geosciences,Beijing 100083,China;4.Department of Earth Science,Nanjing University,Nanjing,Jiangsu 210093,China)  
A NS-striking thrust-nappe belt is developed in the western Ordos Basin,through the cross-section shortening amount calculated and the strain distribution of the strata exactly estimated,the deformation(chara-)(cteristics) of the strata have been quantitatively revealed,therefore the dynamic mechanism of the thrust-nappe was recognized.Due to the development of small-scale folds and faults,a bigger error of the shortening amount may appear using traditional cross-section balancing.In this study,a nonlinear method called fractal theory has been adopted to calculate the cross-section shortening amount.Through this method,a bedded plane can be(regarded) as a complex curve in the two-dimension plane,and the fractal dimension D can be calculated,furthermore,the total amount of cross-section shortening can be obtained.A case study of geological profile AB across Zhuozishan which is located in the north of the western Ordos Basin indicates that the shortening amount and strain are 8 km and 22.2% respectively,and the shortening amount caused by the small-scale folds and faults is 1 km.
【Fund】: 国家自然科学基金项目(40172066 40314141)
【CateGory Index】: P548.2
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