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Geological Society, London, Special Publications; 1993; v. 74; p. 413-428;
DOI: 10.1144/GSL.SP.1993.074.01.28
© 1993 Geological Society of London

High Himalaya

The emplacement of the Manaslu granite of Central Nepal: field and magnetic susceptibility constraints

S. Guillot1, A. Pêcher1, P. Rochette2 & P. Le Fort1

1 Laboratoire de Géodynamique des Chaînes Alpines, Institut Dolomieu, 38031, Grenoble, France
2 Géochimie et Magnétisme des Roches, Faculté St Jérome 13397 Marseille cedex 13, France

This paper investigates the relationship between the emplacement of the Manaslu leucogranite and the regional deformation. Structural data are derived from field measurements and from the anisotropy of magnetic susceptibility of oriented samples. The geometrical relationship between the internal structure of the granite, north vergent folds affecting the Higher Himalayan Sedimentary Series and the E-W dextral shear-zone, separating the Higher Himalayan Crystalline Series and its sedimentary cover, indicate that in the sedimentary series, the collapse structures and E-W dextral shearing are two distinct structural features. Emplacement of the granite post-dates the collapse structures but is related to the E-W dextral shearing. A model for the Manaslu granite emplacement is proposed which requires development of extensional fracturing at 45° to the shear direction, followed by intrusion of granitic magma in successive pulses which results in lateral expansion of the pluton towards the NE.





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