鄂尔多斯盆地西缘北段逆冲推覆带缩短量分形研究

现代地质 ›› 2006, Vol. 20 ›› Issue (1): 35-41.

鄂尔多斯盆地西缘北段逆冲推覆带缩短量分形研究

杨圣彬^1,2，侯贵廷¹，郭庆银^2,3，潘立银⁴，孙晔³

1北京大学地球与空间科学学院，北京100871；2核工业北京地质研究院，北京100029；
3中国地质大学地球科学与资源学院，北京100083；4南京大学地球科学系，江苏南京210093

收稿日期:2005-06-02 修回日期:2005-12-19 出版日期:2006-01-20 发布日期:2006-01-20
作者简介:杨圣彬，男，硕士研究生，1978年出生，构造地质专业，主要从事构造和盆地分析方面的研究。
基金资助:
国家自然科学基金项目（40172066，40314141）

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-ting¹, GUO Qing-yin^2,3, PAN Li-yin⁴, SUN Ye³

1School of Earth and Space Sciences, Peking University, Beijing100871, China；2 Beijing Research Institute of Uranium Geology, CNNC,
Beijing100029， China；3 School of Earth Sciences & Resources, China University of Geosciences, Beijing100083, China；
4 Department of Earth Science, Nanjing University, Nanjing, Jiangsu210093，China

Received:2005-06-02 Revised:2005-12-19 Online:2006-01-20 Published:2006-01-20

摘要/Abstract

摘要：

鄂尔多斯盆地西缘发育南北向展布的逆冲推覆构造带，通过求其地层的缩短量和正确估计应变的分布，可以定量地揭示岩层的变形特征，从而对逆冲推覆构造形成的动力学机制做出客观的判断。由于小尺度褶皱和断层的发育，采用传统的平衡地质剖面方法计算其缩短量往往存在较大的误差，因此，采用非线性的方法——分形几何学求取逆冲推覆构造的缩短量，将剖面中某一地层界线作为二维平面中的一条复杂曲线，求其分维数D，进而计算构造变形的总缩短量。以鄂尔多斯盆地西缘北段桌子山地区AB地质剖面为例进行了应用研究。计算结果表明，桌子山AB地质剖面的缩短量为8 km，应变为22.2％，其中由小尺度褶皱和断层引起的的缩短量为1 km。

关键词: 鄂尔多斯盆地西缘, 逆冲推覆带, 分形理论, 剖面缩短量

Abstract:

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 characteristics 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.

Key words: the western Ordos Basin, thrust-nappe belt, fractal theory, cross-section shortening amount

中图分类号:

P54
P628

杨圣彬侯贵廷郭庆银潘立银孙晔. 鄂尔多斯盆地西缘北段逆冲推覆带缩短量分形研究[J]. 现代地质, 2006, 20(1): 35-41.

YANG Sheng-bin,HOU Gui-ting, GUO Qing-yin, PAN Li-yin, SUN Ye. Fractal Theory Applied to the Study of Cross-section Shortening Amount in Northern Thrust-nappe Belt of the Western Ordos Basin[J]. Geoscience, 2006, 20(1): 35-41.

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