Synorogenic extension in the Tethyan Himalaya documented by structural studies and the Kubler index, Lachung La area, NW India

Détails

ID Serval
serval:BIB_4B19A2A7785F
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Synorogenic extension in the Tethyan Himalaya documented by structural studies and the Kubler index, Lachung La area, NW India
Périodique
Clay Minerals
Auteur(s)
Girard M., Thélin P., Steck A.
ISSN-L
0009-8558
Statut éditorial
Publié
Date de publication
2001
Peer-reviewed
Oui
Volume
36
Pages
237-247
Langue
anglais
Résumé
Tectonic observations in the Tethyan Himalaya reveal an important
extensional event that succeeds the emplacement of SW-verging nappes. A
major thrust, called the Kum Tso Thrust, has been backfolded and
reactivated by normal faulting associated with this event.
Measurements of the Kubler index, coupled with characterization of
clay-size paragenesis show the effect of normal faulting on the regional
metamorphic zonation and indicate that important extension zones, like
the Sarchu-Lachung La Normal Fault Zone (SLFZ), exist within the Tethyan
Himalaya. Diagenetic limestones from within the SLFZ are characterized
by the occurrence of mixed-layered clay phases, kaolinite and an illite
with a 001 peak >0.4 Delta degrees2 theta. This zone is bordered by two
anchizonal-to-epizonal zones, where illite peaks become narrower.
Further to the NE the successive appearance of biotite, chloritoid,
garnet and garnet-staurolite-kyanite assemblapes testifies to an
increase in metamorphic grade. The cataclastic samples from the normal
faults contain kaolinite, smectite and a `broad' illite, indicating that
extension occurs under diagenetic conditions.
Création de la notice
07/12/2012 16:56
Dernière modification de la notice
03/03/2018 16:57
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