Publications des scientifiques de l'IRD

Chardon Dominique, Jayananda M. (2008). Three-dimensional field perspective on deformation, flow, and growth of the lower continental crust (Dharwar craton, India) - art. no. TC1014. Tectonics, 27 (1), p. NIL_20-NIL_34. ISSN 0278-7407.

Titre du document
Three-dimensional field perspective on deformation, flow, and growth of the lower continental crust (Dharwar craton, India) - art. no. TC1014
Année de publication
2008
Type de document
Article référencé dans le Web of Science WOS:000253535500001
Auteurs
Chardon Dominique, Jayananda M.
Source
Tectonics, 2008, 27 (1), p. NIL_20-NIL_34 ISSN 0278-7407
The study of fabric development and juvenile batholith emplacement across the tilted crustal section of the Eastern Dharwar craton shows that horizontal, constrictional deformation affected large volumes of the midcrust and lower crust at the time of regional partial melting and magmatic accretion. Constriction is achieved by a combination of coeval shallow and steep planar fabrics sharing a common horizontal elongation direction, two sets of conjugate strike-slip shears, and extensional shear zones. The Eastern Dharwar craton illustrates an end-member deformation mode by which a particularly weakened lithosphere responds to shortening by developing distributed, horizontal plane strain on a crustal scale, resulting from the combination of crustal shortening and lateral gravity-driven flow. Thinning accompanying constrictional deformation is interpreted as compensating for juvenile magmatic accretion and thickening of greenstone belts and as acting to maintain a stable crustal thickness. Such a midcrustal to lower crustal deformation process may provide a resolution of the batholithic room problem in a softened crust submitted to lateral shortening and may explain nearly isobaric retrograde pressure-temperaturetime paths of high temperature - low pressure high-grade terrains.
Plan de classement
Géologie et formations superficielles [064]
Identifiant IRD
PAR00002193
Contact