FAST DETERMINATION OF BASIN'S PALEO-TECTONIC STRESS DIRECTION BY BALANCED CROSS SECTION——A NEW METHOD TO ANALYZE PALEO -TECTONIC STRESS DIRECTION
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摘要: 确定古构造应力方向是盆地古构造应力场研究中一个非常重要的内容,该文提出了一种分析盆地古构造应力方向的新方法。首先利用平衡剖面技术,计算盆地在各地质时期不同方向上的形变率,然后借鉴材料力学中利用应变花求取主应力方向的办法,将盆地在3个不同方向上的形变率等同于应变花的3个线应变,进而利用相应公式求得盆地的古构造应力方向。利用该方法求得胶莱盆地白垩纪莱阳期、青山期和王氏期的第一拉张主应力方向分别大致为北东—南西、北西—南东和南—北向,这与由其他传统地质方法分析得到的结果对应性良好,说明该方法是实际可行的。此外,形变率在不同方向剖面上的变化趋势可反映盆地的力学性质,因此该方法还有助于判定盆地类型和成盆机制。该方法具有方便、快捷的特点,并且不受地层出露情况的制约。Abstract: To determine the direction of paleo-tectonic stress is a very important matter for basin's paleo-tectonic stress field research.A new method has been brought forward to analyze paleo-tectonic stress direction.Firstly,the balanced cross section technique is applied to obtain basin's deformation rates in different directions during each geological stage.Then,the strain rosette method is employed to calculate principal stress direction in mechanics of materials.Further,basin's deformation rates in 3 different directions are equated with strain rosette's linear strains.At last,basin's paleo-tectonic stress directions are figured out using the relevant formulae from mechanics of materials.The directions of the 1st extensional principal stress during Laiyang,Qingshan and Wangshi stages in the Jiaolai Basin have been obtained by this method,approximately NE-SW,NW-SE and S-N respectively.These results accord with those from other traditional geological methods,illustrating the feasibility of the new method.Besides,the changing trend of deformation rates in sections with different directions can reflect basin's mechanical property,so this method is also helpful for analyzing basin type and basin-forming mechanism.Obviously,this new method is convenient and can fast produce results,and is not restricted by strata outcrop condition.
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