Geometrical interpretation of positive and negative flower structure model

Geotechnical Geology

دوره 4، شماره 2، مرداد 2008، صفحه 90-96   

نوع مقاله: Original Research

نویسندگان

Arash Pahlavani^{* 1}؛ Mohsen Pourkermani²

¹Department of geology, Faculty of Science, Islamic Azad University - North Tehran Branch, Tehran, Iran

²Department of Geology, Islamic Azad University - North of Tehran, Tehran, Iran

چکیده

Flower structures are amongst interesting phenomena in structural geology, whose three-dimensional understanding and interpretation are a bit difficult. In order to resolve this problem, a three-dimensional model has been represented, in which the type and direction of fault block movements both in plan view and cross section can be observed. Two horizontal and vertical quadratic prisms of the same size are cut to resemble the flower structure. The contact faces of the cut blocks are covered by glossy paper so as to reduce friction and facilitate their motion. The two quadratic prisms are then placed in a glass box and are pushed by wooden levers. The design of the model is such that only shearing forces act with no tensile or compressive components. The result from such set-up is that even in regions with only shearing tectonic regimes transtensional and transpressional structures form.

کلیدواژه‌ها

Flower structure؛ Restraining and releasing bends؛ Strike-slip faults؛ Structural geology model