[Geoinfo] Gondwana 14-Session 5

[Roberto D. Martino]

Estimados colegas,

Les envio y los invito a participar de la Gonwana Amalgamation,  
Sesion 5, del Gondwana 14  "East meets West"
  a realizarse entre los dias 25 a 30 de Setiembre de 2011 en Armacao  
Dos Buzios, Rio de Janeiro, Brasil.

Gondwana 14 Conference will be held in Búzios, Rio de Janeiro State,  
Brazil. Research in the fields of geology, paleontology,
mineral deposits and tectonic history of Gondwana evolution,  
amalgamation, development and break-up,
will form the basis for the theme of the conference.

Abstract Deadline: Marzo 2011 (falta precisar el dia, se comunicara  
por este medio).

Se adjunta un pdf con las otras sesiones de la tematica Gondwana  
Amalgamation

http://www.gondwana14.org

Reciban un cordial saludo.

Roberto D. Martino

*************************************
Prof. Dr. Roberto Donato Martino
Cátedra de Geología Tectónica
            F.C.E.F. y N.
Universidad Nacional de Córdoba

Pabellón de Geología
Oficina 6 - 2° Piso
Av. Vélez Sarsfield 1611
Ciudad Universitaria
X 5016 GCA-Córdoba
República Argentina

Voice: 54-351-4344980 - Int. 115
Fax: 54-351-4334139

e-mail: rdmartino en com.uncor.edu

**************************************

SESSION 5 – GONDWANA SHEAR ZONES AND SUTURES: HISTORIES OF
THE AMALGAMATION OF A SUPERCONTINENT AND INHERITANCE ON
CONTINENTAL DEFORMATION

Conveners: R.D. Martino (Argentina), G. Vujovich (Argentina), Marcos  
Egydio Silva (Brasil)
rdmartino en com.uncor.edu, graciela en gl.fcen.uba.ar, megydios en usp.br

Large shear zones systems, from hundreds to thousands of kilometers,  
occur in
all Mesoproterozoic and Neoproterozoic orogens from Gondwana. Some good
examples are: the Sobral-Kandi-Transbrasiliano lineament and the  
Trans-Africa,
Central Africa, Nadj, Narmada-Son shear zones. These shear zones are  
products
of the amalgamation of a group of continental blocks, with distinct  
histories and
characteristics. Some are parallel to the orogenic belts and other  
define and
contour the cratonic blocks, that vary from weak to strongly  
deformed. The
displacement could have hundreds of kilometers, with fault rocks  
developing in
even more than one kilometer of thickness, and presents either  
vertical or
horizontal movement components. These shear zones are usually not well
understood but are significant for the kinematic analysis of Gondwana  
assembly,
inheritance and heterogeneities that are produced during reactivation  
of younger
orogens or extension and dispersion of continents. In addition, the low
preservation of ophiolitic lenses in these deeply eroded Proterozoic  
orogens,
difficult their recognition, and also the presence of upper mantle  
sheets
associated with some shear zones, are very good motives for a  
discussion about
shear zones and sutures in this Gondwana Conference.





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