Hi John, here in Chile we have some excellent exposures of Jurassic and
Cretaceous mafic dyke swarms along the coast near Santiago. Some of them
exhibit transform offsets and vertical faulting inside dykes, other show
internal ductile fabrics of sinistral displacements. The dykes intrude
mostly into Late Paleozoic granitoids and gneiss, but relationship with
Mesozoic volcanism is still a problem to resolve!!.
Cheers
Christian Creixell
-----Mensaje original-----
De: Tectonics & structural geology discussion list
[mailto:[log in to unmask]] En nombre de John F. Dewey
Enviado el: lunes, 12 de septiembre de 2011 11:33
Para: [log in to unmask]
Asunto: 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
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Prof. John F. Dewey FRS, M.R.I.A., FAA, Mem. Acad. Eur., Mem.
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