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Dear colleagues, we first would like to wish you a happy and geologically exciting new year. We would also like to remind you there is still time to send your abstracts to the next European Geosciences Union (EGU) General Assembly in Vienna (27 April - 2 May 2014), in particular to our session: TS1.2/GD7.9 -* TRANSPRESSIONAL/TRANSTENSIONAL DEFORMATION AT OBLIQUE TECTONIC SETTINGS* Convener: *Manuel Díaz-Azpiroz* (Universidad Pablo de Olavide, Seville, Spain) Co-conveners: *Dyanna M. Czeck* (University of Wisconsin-Milwakee, USA), *Carlos Fernández* (Universidad de Huelva, Spain), *Karen Leever* (GFZ Potsdam, Germany) In plate tectonics, the rotational relative displacements of lithospheric plates imply that oblique plate boundaries must be the norm, rather than the exception. Oblique displacement includes a lateral and an orthogonal component, which can be convergent (Transpression) or divergent (Transtension). Therefore, a better understanding on the kinematics and the mechanics involved in transpressional and transtensional deformation is crucial to the knowledge of the processes that take place at plate tectonic boundaries. Transpression was first modeled by Sanderson and Marchini in what has become one of the most cited papers in Structural Geology. Now, thirty years after its publication, their proposal is still current, and many Structural Geology and Tectonic studies are partly based on it. Subsequent kinematic models have become progressively more complex, including transtension (kinematically equivalent to transpression but with a divergent, rather than convergent orthogonal strain component), triclinic symmetries arising from oblique simple shear and/or coaxial extrusion, general coaxial strain, deformation zones with migrating limits, etc. These have helped to understand many natural deformation zones, at different tectonic settings, that could not be explained by more simple models. Still, there are several aspects, some of them currently ongoing, that will improve our knowledge of deformation at oblique tectonic settings, such as heterogeneous deformation, non-steady strain rates or the consideration of mechanical aspects. We pretend to acknowledge Sanderson and Marchini's contribution, by proposing a broad session covering different topics related to oblique tectonics: studies on natural cases of deformation at oblique tectonic settings, including oblique convergent orogens, lateral branches of orogenic arcs, strike-slip settings or transtensional tectonics; as well as innovative approaches on numerical (kinematical and mechanical) and analogue modeling of transpressional/transtensional deformation. Our aim is provoke wide discussion that would include (1) heterogeneous distribution of simple shear and coaxial components of deformation, (2) transpressional/transtensional zones showing strain partitioning at multiple scales, (3) upper crustal heterogeneous transpression/transtension or (4) tectonic uplift and basin development related to transpression/transtension. For any further information about the session, please contact us: Manuel Díaz-Azpiroz ([log in to unmask]), Dyanna M. Czeck ([log in to unmask]), Carlos Fernández ([log in to unmask]), Karen Leever ([log in to unmask]). *IMPORTANT DEADLINES: * *For abstract submission: 16 January 2014, 13.00 CET * Links to relevant information: About our session: http://meetingorganizer.copernicus.org/EGU2014/session/14725 About abastract submission: http://www.egu2014.eu/abstract_management/how_to_submit_an_abstract.html About EGU General Assembly 2014: http://www.egu2014.eu/ We look forward to seeing you in Vienna. Best regards, Manuel, Dyanna, Carlos and Karen -- ----------------------------------------- Manuel Díaz Azpiroz Dpt. Sistemas físicos, químicos y naturales Universidad Pablo de Olavide Crtra. Utrera, km 1 41013 Sevilla Tf: +34 954 348351 Fax: 954349814 [log in to unmask] -----------------------------------------