Dear colleagues,

This is a kind reminder for a general call-for-papers for a thematic  
issue in Geological Magazine entitled : Tectonic evolution and  
mechanics of basement-involved fold-and-thrust belts.

  Following a successful session in the 2015 EGU (European Union of  
Geosciences) Vienna meeting, we aim at producing a thematic issue on  
this topic in Geological Magazine. We welcome papers either from  
participants to the session or from interested people who were unable  
to attend the meeting.

  Description :
  There are increasing lines of evidence of basement-involved  
shortening in fold-and-thrust belts (FTB) and external zones of  
orogens. Reactivation/inversion of pre-existing extensional/transfer  
basement faults is widespread during the evolution of (collisional)  
orogens and this process strongly controls their structural and  
mechanical evolution. Basement fault reactivation may induce  
localization of thrusts and folds in the developing shallow  
compressional wedge, development of crystalline thrust sheets,  
out-of-sequence thrusting and refolding of shallow nappes, development  
of accommodation structures such as lateral ramps or development of  
basement uplifts. In some cases however, inherited normal faults are  
not reactivated whereas newly-formed compressional shear zones  
develop. This brings into question the bulk rheology of the crust vs  
the rheology of preexisting fault zones available for reactivation.

  In basement-involved, or thick-skinned, FTB, shortening is  
distributed throughout the whole crust and is usually lower than in  
their thin-skinned (subduction-type) counterparts, which likely  
requires/reflects a specific thermo-mechanical behavior of the  
underlying lithosphere (e.g, hot and young, hence weak).  
Basement-involvement in FTB also raises the question of the way the  
orogen is mechanically coupled to the foreland and how orogenic  
stresses are transmitted through the heterogeneous basement of the  
foreland/plate interior. Well-known case studies like the active  
Sierras Pampeanas or the Laramide uplifts are probably linked to  
specific geodynamic settings like flat-slab subduction, hence  
increased interplate coupling.

  In some cases, two thrust systems may develop, an upper,  
thin-skinned one and a lower basement-involved one. These can be  
coeval or separate in time.

  This thematic issue aims at making the point on our knowledge of  
what controls the involvement of basement deformation in FTB, how it  
is accommodated in space and time, and with which kind of  
crustal/lithosphere rheology it is associated.

  We welcome all types of contributions about basement-involved  
fold-and-thrust belts, including regional case studies based on field  
and/or geophysical works, active basement shortening and related  
seismic hazard, as well as mechanical investigations of this type of  
belts together with analogue or numerical modeling approaches.


  IMPORTANT : Deadline for committing to contribute and for submitting  
provisional abstracts : May 1st, 2015

  Deadline for submitting manuscripts : October 31st, 2015

  Contact : [log in to unmask]


  All the best
  Olivier, on behalf of Jonas (Ruh), Dennis (Brown) and Faramarz  
(Nilfouroushan).


  Prof. Dr Olivier Lacombe
  Université Pierre et Marie Curie - Sorbonne Universités
  Institut des Sciences de la Terre de Paris - ISTeP
  UMR 7193 UPMC et CNRS
  Couloir 46-45 2ème étage
  Boîte 129; 4, Place Jussieu
  75252 PARIS Cedex 05, France
  Tél : 33 1 44 27 71 80
  e-mail : [log in to unmask]
  http://www.istep.upmc.fr/
  http://merco220.free.fr



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