Hi Taija
There is quite a large literature on the filling and closure of the Rocas Verdes basin of the southern Andes - formed in the Jurassic as a back-arc basin, filled with volcaniclastic turbidites in the Early Cretaceous (Yahgan Formation of Tierra del Fuego and Cumberland Bay Formation of South Georgia) deformed in the mid-Cretaceous with considerable (c. 100%) shortening and uplifted to form the foothills of the Late Cretaceous-Cenozoic Patagonian retro-arc foreland system. Key authors are I.W.D. Dalziel, P.W.G. Tanner, B.C. Storey, and M.A. Winslow. Like your basin, the original sedimentary structures are well preserved, despite a strong S1 cleavage. Long sections can be logged and dispersal directions worked out.
A few references that may help:
Dalziel, I.W.D. 1981. Back-arc extension in the Southern Andes: a review and critical reappraisal. Philosophical Transactions of the Royal Society of London A300, 319-335.
Storey, B.C. and Macdonald, D.I.M. 1984. Processes of formation and filling of a Mesozoic back-arc basin on the island of South Georgia. Special Publication of the Geological Society of London 16, 207-218.
Tanner, P.W.G. and Macdonald, D.I.M. 1982. Models for the deposition and simple shear deformation of a turbidite sequence in the South Georgia portion of the Southern Andes back-arc basin. Journal of the Geological Society 139, 739-754.
Hope these help.
With best wishes
David
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-----Original Message-----
From: Tectonics & structural geology discussion list [mailto:[log in to unmask]] On Behalf Of Taija Torvela
Sent: 02 October 2012 17:06
To: [log in to unmask]
Subject: Closure of sedimentary basins?
Hi all,
I'm doing a study of a closed volcanosedimentary (back-arc) basin, and I'm searching for papers about the processes during basin closure. I would be especially keen to know about how the strain of the huge amounts of shortening at basin scale is accommodated during the inversion and finally the closure, and of how/why sometimes the primary structures are still very well preserved throughout the basin... The one I'm studying is 1900 Ma old and tightly to isoclinally folded at >500 m wavelength scale (and there seems to be some thrust faults as well), but almost everywhere you look you can still see the primary structures almost like they were formed yesterday! The rocks show clear schistosities for most parts of course, but that's about it (and sometimes not even that). I've found literally thousands of papers related to basin inversion tectonics and/or to fold&thrust belts, but trying to find the applicable ones among the mass... well you know how it is. So if anyone could hint of studies (modelling, field work, anything really) that could elucidate my specific dilemma, I would be very grateful.
Cheers
Taija
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Dr Taija Torvela
Lecturer
Applied Structural Geology
University of Leeds
School of Earth and Environment
Earth and Environment Building
Leeds
LS2 9JT
UK
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