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Hi Yvette, You may already be aware of it - but I think Lilian Skjernaa discussed orogen parallel stretch in some of her papers on the Norwegian Caledonides. Bestwishes ian ---------------------------------------------------------------- Dr Ian Alsop Sixth Century Reader in Structural Geology and Tectonics, Department of Geology and Petroleum Geology, School of Geosciences, Kings College, University of Aberdeen, Aberdeen, AB24 3UE, UK. DIRECT TEL. 01224 273438 E-MAIL [log in to unmask] HOMEPAGE http://www.abdn.ac.uk/geology/people/staffpages/ialsop/ialsop.php STRUCTURAL GEOLOGY & TECTONICS http://www.abdn.ac.uk/geology/research/themepages/structgeoltect.php Salt tectonics, Sediments & Prospectivity Conference 20-22 JANUARY 2010 *NOTE EXTRA DAY* http://www.abdn.ac.uk/geology/events/saltsediment/index.php ________________________________________ From: Tectonics & structural geology discussion list [[log in to unmask]] On Behalf Of Yvette Kuiper [[log in to unmask]] Sent: 20 November 2009 01:12 To: [log in to unmask] Subject: Shear zone-parallel or orogen-parallel horizontal stretch Hi All, In the past few years I keep finding myself in shear zones (transpression zones) and orogens that seem to show good evidence for shear zone-parallel or orogen-parallel horizontal stretch. The evidence is based on rotated lineations and fold hinge lines that are best explained by such stretch. It makes me wonder how much shear zones or orogens can stretch parallel to their strikes in nature. At some point, there would be space problems and strain compatibility problems. My questions to you: What is the maximum shear zone-parallel horizontal stretch anyone recorded? What was the length of that shear zone? Was the stretch localized or homogeneous along the entire length of shear zone? What is the maximum orogen-parallel horizontal stretch anyone recorded? What was the length of the orogen? If you have any thoughts on any of these questions, I would be very interested to hear. Thanks, Yvette -- Yvette D. Kuiper Assistant Professor Department of Geology and Geophysics Boston College Devlin Hall 213 140 Commonwealth Avenue Chestnut Hill, MA 02467 USA Tel. 617-552-3647 Fax. 617-552-2462 http://www2.bc.edu/~kuipery/ The University of Aberdeen is a charity registered in Scotland, No SC013683.