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>Dear Paul, Many thanks. I will email Paul Mohr immediately. I remember a very fine field trip with him thirty or so years ago on the early Palaeogene mafic intrusions of western Ireland. Best wishes, John >John, > >Paul Mohr must have a lot of the data you need. He is still active in >Galway. You could try [log in to unmask] If not, let me know >privately and I'll make contact. > >Paul > >Professor Paul D. Ryan >EOS, NUI, Galway, Ireland >tel:+353(0)91794599 mob: +353(0)872956190 > > > >-----Original Message----- >From: Tectonics & structural geology discussion list on behalf of >John F. Dewey >Sent: Tue 9/13/2011 5:50 PM >To: [log in to unmask] >Subject: Re: Mafic dykes > >>Dear David, > >Thank you very much for the info. If you have any more data, >contacts, references, photos etc., I would be very grateful to >receive them. I will let you know how the study progresses. I am >interested in the instantaneous strain (stress reciprocal) fields of >dyke emplacement, propagation rates of dyke tips and the 3D of dyke >transform relays in both coaxial extension and (non-coaxial) >transtension. I am trying to understand fracture patterns in dyke >wall-rocks in relation to the changing stress fields of dyke >propagation in volcanoes, in their flanks, and in dykes propagating >laterally over large (hundreds of kilometres) distances Ideally, I >would like to make detailed maps of dykes and their wall-rock >structures in perfectly-exposed rock platforms that have >perfectly-exposed cliffs rising from them in two dimensions! > >Best wishes, >John > >>Dear John >>Off the beaten track, but the Jurassic dykes are very well-exposed >>in the Falkland Islands, intruding Devonian quartzites and (to a >>lesser extent) Permian glacial and deltaic sediments. Good rock-cut >>platforms around the coasts. I do not know about South Africa, but >>it is possible that there are equally well-exposed examples in the >>Cape. >> >>With best wishes >>David >> >><-<<--<<<--->>>-->>-> >>David Macdonald >>University of Aberdeen >>Meston Building >>Aberdeen AB24 3UE >> >>Tel: 01224-273451 >>Mobile: 07909-611775 >>E-mail: [log in to unmask] >>Web: >>http://www.abdn.ac.uk/geology/people/staffpages/dmacdonald/dmacdonald.php >> >> >>-----Original Message----- >>From: Tectonics & structural geology discussion list >>[mailto:[log in to unmask]] On Behalf Of John F. Dewey >>Sent: 12 September 2011 15:33 >>To: [log in to unmask] >>Subject: Re: Mafic dykes >> >>>_Dear Colleagues, >> >>I am seeking out 100% exposed marine rock platforms where mafic dykes >>and their wall structures, and, ideally, relay/transform offsets, and >>terminations can be studied. I am seeking places where dykes were >>injected laterally away from volcanic centres and places where dykes >>were injected vertically beneath volcanic centres. I have visited a >>few spots in Arran, Mull, and Skye but I am looking for a lot more. >>Any help and suggestions will be greatly appreciated. >> >>Best wishes, >>John >> >>>_____________________________________________________ >>> >>>________________________________________________________________________ >>> >> >>-- >>Please note that my email address has changed to: [log in to unmask] >> >>Prof. John F. Dewey FRS, M.R.I.A., FAA, Mem. Acad. Eur., Mem. >>US Nat. Acad. Sci., Distinguished Emeritus Professor University of >>California, Emeritus Professor and Supernumerary Fellow, University >>College Oxford. >> >> Sherwood Lodge, >> 93 Bagley Wood Road, >> Kennington, >> Oxford OX1 5NA, >> England, UK >> >> University College, >> High Street, >> Oxford OX1 4BH >> >> Telephone Nos: >> 011 44 (0)1865 735525 (home Oxford) >> 011 44 (0)1865 276792 (University College Oxford) >> >> >>The University of Aberdeen is a charity registered in Scotland, No SC013683. > > >-- >Please note that my email address has changed to: [log in to unmask] > >Prof. John F. Dewey FRS, M.R.I.A., FAA, Mem. Acad. Eur., Mem. >US Nat. Acad. Sci., Distinguished Emeritus Professor University of >California, Emeritus Professor and Supernumerary Fellow, University >College Oxford. > > Sherwood Lodge, > 93 Bagley Wood Road, > Kennington, > Oxford OX1 5NA, > England, UK > > University College, > High Street, > Oxford OX1 4BH > > Telephone Nos: > 011 44 (0)1865 735525 (home Oxford) > 011 44 (0)1865 276792 (University College Oxford) -- Please note that my email address has changed to: [log in to unmask] Prof. John F. Dewey FRS, M.R.I.A., FAA, Mem. Acad. Eur., Mem. US Nat. Acad. Sci., Distinguished Emeritus Professor University of California, Emeritus Professor and Supernumerary Fellow, University College Oxford. Sherwood Lodge, 93 Bagley Wood Road, Kennington, Oxford OX1 5NA, England, UK University College, High Street, Oxford OX1 4BH Telephone Nos: 011 44 (0)1865 735525 (home Oxford) 011 44 (0)1865 276792 (University College Oxford)