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Dear Onana, The rheological behavior of migmatites is probably viscoplastic to viscous and retrieving the stress ellipsoid from their structural analysis is not an easy task. Regarding the rheological behavior and structural analysis of migmatites I suggest: Brown, M., 1994. The generation, segregation, ascent and emplacement of granite magma: the migmatite-to-crustally-derived granite connection in thickened orogens. Earth Science Reviews 36, 83–130. Robin, P.-Y.F., 1979. Theory of metamorphic segregation and related processes. Geochmica Cosmochimica Acta 43, 1587–1600. Rosenberg, C.L., Handy, M.R., 2005. Experimental deformation of partially melted granite revisited: implications for the continental crust. Journal of Metamorphic Geology 23 (1), 19–28. Van Der Molen, I., 1985a. Interlayer material transport during layer-normal shortening. Part I: the model. Tectonophysics 115, 275–295. Van Der Molen, I., 1985b. Interlayer material transport during layer-normal shortening. Part II: boudinage, pinch-and-swell and migmatite at Sondre Stromfjord airport, West Greenland. Tectonophysics 115, 297–313. Vanderhaeghe, O., 1999. Pervasive melt migration from migmatites to leucogranite in the Shuswap metamorphic core complex, Canada: control of regional deformation. Tectonophysics 312 (1), 35–55. Vanderhaeghe, O., 2001. Melt segregation, pervasive melt migration and magma mobility in the continental crust: the structural record from pores to orogens. Physics and Chemistry of the Earth, Part A: Solid Earth and Geodesy 26 (4–5), 213–223. Vigneresse, J.-L., Barbey, P., Cuney, M., 1996. Rheological transitions during partial melting and crystallization with application to felsic magma segregation and transfer. Journal of Petrology 70 (6), 1579–1600. Weinberg, R.F., 1999. Mesoscale pervasive felsic magma migration: alternatives to dyking. Lithos 46 (3), 393–410. For detailed structural analysis of migmatites in their tectonic context, I suggest: Kruckenberg, S., Whithney, D.L., Teyssier, C., Fanning, C.M., Dunlap, W.J., 2008. Paleocene–Eocene migmatite crystallization, extension, and exhumation in the hinterland of the northern Cordillera: Okanogan dome, Washington, USA. Geological Society of America Bulletin 120, 912–929. Kruckenberg S.C., Vanderhaeghe O., Ferré E.C., *Teyssier C., *Whitney D.L., Chapman A. (2011): Flow of partially molten crust and the internal dynamics of a migmatite dome, Naxos, Greece. Tectonics 30, TC3001, doi:10.1029/2010TC002751. Sawyer, E.W., Dombroski, C., Collins, W.J., 1999. Movement of melt during synchronous regional deformation and granulite-facies anatexis, an example from the Wuluma Hills, central Austraila. In: Castro, A., Fernandez, C., Vigneresse, J.L. (Eds.), Understanding granites: integrating new and classical techniques: The Geological Society of London, Special Publications, London, pp. 221–237. Solar, G.S., Brown, M., 2001a. Deformation partitioning during transpression in response to Early Devonian oblique convergence, Northern Appalachian orogen, USA. Journal of Structural Geology 1043–1065. Toé W., Vanderhaeghe O., André-Mayer A.-S., Feybesse J.-L., Milési J._P. (2013). From migmatites to granites in the Panafrican Damara Belt, Namibia. Journal of African Earth Sciences 85, 62-74. Vanderhaeghe O. (2009). Migmatites, granites and orogeny: Flow modes of partially molten rocks and magmas associated with melt/solid segregation in orogenic belts. Tectonophysics, 477, 119-134. Weinberg RF, Hasalova P, Ward L, and Fanning CM (2013) Interaction between deformation and magma extraction in migmatites: Examples from Kangaroo Island, South Australia: Geological Society of America Bulletin, 125, 1282–1300, doi:10.1130/B30781.1. Weinberg RF, and Mark G (2008) Magma migration, folding, and disaggregation of migmatites in the Karakoram Shear Zone, Ladakh, NW India: Geological Society of America Bulletin, 120, 994–1009. Weinberg, R.F., Searle, M.P., 1998. The Pangong Injection Complex, Indian Karakoram: a case of pervasive granite flow through hot viscous crust. Journal of the Geological Society (London) 155, 883–891. De : Tectonics & structural geology discussion list [mailto:[log in to unmask]] De la part de epibp01 Envoyé : samedi 28 avril 2018 10:24 À : [log in to unmask] Objet : Re: origin of foliation boudinage Dear Onana, If the foliation boudinage is in migmatites, they may also result from melt escape. Folitaion boudinage is very common in migmatites. Maybe have a look at: Bons, P.D., Druguet, E., Castaño, L.M., Elburg, M.A. (2008) Finding what is not there anymore: recognizing missing fluid and magma volumes. Geology 36, 851-854. doi: <http://geology.gsapubs.org/content/36/11/851.full> 10.1130/G24984A.1<http://geology.gsapubs.org/content/36/11/851.full> Bons, P.D., Becker, J.K., Elburg, M.A., Urtson, K. 2010. Granite formation: stepwise accumulation or connected networks? Earth and Environmental Science Transactions of the Royal Society of Edinburgh 100, http://dx.doi.org/10.1017/S175569100901603X<http://journals.cambridge.org/abstract_S175569100901603X> Best wishes, Paul. On 26 Apr 2018, at 12:37 , Onana Jacques Bertrand <[log in to unmask]<mailto:[log in to unmask]>> wrote: Thank you Mr Antonio for your intervention. and all membrers. I'm very glad about these exhanges. The environment is a hill in the shape of a dome. bodinage foliation in migmatites forms series of folds with an average dipping angle of 10-20 ° (practically horizontal) and vertical axial planes. the hinge dip in all directions on the outcrop. If the foliation is horizontal, the maximum stress sigma 1 is vertical. I wonder too. is this type of foliation not a fold of flow? can be the result of a mantle climb? Best regards, in fact the outcrop is on a migmatitic hill. migmatites show a foliation of boudinage. The limb hang in NNE and SSW directions, then in all other directions. the boudinage is the result of extension Thank you for all papers you sent me, I will consult them. Le mercredi 25 avril 2018 à 22:55:57 UTC+2, Antonios Marsellos <[log in to unmask]<mailto:[log in to unmask]>> a écrit : The first response would be extension by pure shear if it applies to one rock, but there are exceptions once observation is more detailed and not referred to more rocks at a study area. Perhaps, multistage extension overprinting one another? Along the foliation, I guess you mean to one plane and not in all directions of multiple planes. Is the extension uniformly distributed along all directions? - could you please be more specific? Also, what type of rock does it host this boudinage? Antonios Marsellos Hofstra University New York, USA On Wed, Apr 25, 2018 at 3:35 PM, Haakon Fossen <[log in to unmask]<mailto:[log in to unmask]>> wrote: Sounds like general flattening (extension in all directions along the foliation) hf On 25 Apr 2018, at 15:57, Onana Jacques Bertrand <00001e61ee568de7-dmarc- [log in to unmask]<mailto:[log in to unmask]>> wrote: Hi dear members of Geo-tectonics! Please someone can explain me The meaning of foliation boudinage that dips in all directions? ________________________________ Paul D. Bons (Prof. Structural Geology) Department of Geosciences, Eberhard Karls University Tübingen Wilhelmstrasse 56, 72074 Tübingen, Germany Email: [log in to unmask]<mailto:[log in to unmask]> Tel: +49 (0)7071 2976469, Fax: +49 (0)7071 293060 URL: structural-geology.info<http://structural-geology.info> ORCID ID: orcid.org/0000-0002-6469-3526<http://orcid.org/0000-0002-6469-3526> ResearcherID F-2942-2011<http://www.researcherid.com/rid/F-2942-2011> Scopus Author ID 7003728863<http://www.scopus.com/inward/authorDetails.url?authorID=7003728863&partnerID=MN8TOARS>