We present a new tectonic map focused upon the extensional style accompanying the formation of the Tyrrhenian back‐arc basin. Burchfiel, B. C. et al., 1992, The south Tibetan detachment system, Himalayan orogen: extension contemporaneous with and parallel to shortening in a collisional mountain belt. Formation of Extensional Basin in Internal Part of the Zag-Ros Orogeny in West of Sirjan, Iran () Amin Azadikhah 1 , Soheila Bouzari 1 , Ali Yassaghi 2 , Mohammad Hashem Emami 3 1 Department of Geology, North Tehran Branch, Islamic Azad University, Tehran, Iran . formed during the same rift episode as the Maestrat In the Harz Mountains (eastern Germany), banded basin, and most of the Zn-Pb deposits in the basin can galena-sphalerite-quartz-calcite veins also formed be related to extensional tectonics before the onset of after the Variscan orogeny (Large, 2003). The evolution of extensional sedimentary basins is governed by the surrounding stress field and can, therefore, be expected to be highly sensitive to variations in these stresses. 67, No. We first model formation of a sedimentary basin by extension of continental lithosphere to achieve a mechanically and thermally consistent model that can be used to investigate the influence of the postrift phase on inversion structures. Larsen, R.H. Gabrielsen, W. Sassi Introduction and background This volume contains a collection of papers on the dynamics of extensional basin formation and inversion presented at the 3rd annual workshop of the International … We specifically focus on the influence of the inherited extensional architecture and basin fill properties on the deformational structures that form during inversion. To this purpose we perform two-dimensional thermomechanical numerical experiments. Australian Journal of Earth Sciences: Vol. Formation of an extensional sedimentary basin. (2020). Geological Society of America Special Paper 269. 663-680. We developed a MATLAB code, MODBAS, to model extensional sedimentary basin formation based on the CSSPSM. Phase 2 (17-4 Ma) was a period of NE-trending extensional basin development and Our aim is to study the formation of extensional sedimentary basins and their subsequent contractional inversion in a consistent manner. It has been argued that the gravitational collapse of older compressional structures caused the extension. 5, pp. Eidholm, B.T. Basin formation models are subdivided into three categories from the rheologi- We begin with a review of the strength envelope concept, its uncer- tainties and assumptions. in extensional basin modelling, and to discuss the consequences and limitations associated with the different rheological assumptions. Mechanics of basin formation and its development, therefore, vary according to the tectonic processes of the set up Thus, basins are classified and grouped under plate tectonic set up and processes involved, viz., Divergent, Convergent & Transform settings respectively characterized by extensional, compressional & trans- Our basin‐wide analysis synthetizes the interpretation of vintage multichannel and single channel seismic profiles, integrated with modern seismic images and P‐wave velocity models, and with high resolution morpho‐bathymetric data. TECTONOPHYSICS ELSEVIER Tectonophysics 240 (1994) 1-9 Dynamics of extensional basin formation and inversion: introduction S. Cloetingh, 0. Renova Formation and its equivalents were deposited in both the “rift zone” and the supradetachment basin at this time. 2 Department of Geology, Tarbiat Modares University, Tehran, Iran . The validity of the code was tested with a single listric fault model and a multiple-fault model. 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