Sedimentary record of the northward flight of India and its collision with Eurasia (Ladakh Himalaya, India)

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Etat: Public
Version: de l'auteur⸱e
ID Serval
serval:BIB_241A8F543704
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Sedimentary record of the northward flight of India and its collision with Eurasia (Ladakh Himalaya, India)
Périodique
Geodinamica Acta
Auteur⸱e⸱s
Garzanti E., Baud A., Mascle G.
ISSN
0985-3111
Statut éditorial
Publié
Date de publication
1987
Volume
1
Pages
297-312
Langue
anglais
Résumé
Stratigraphic and petrographic analysis of the Cretaceous to Eocene Tibetan sedimentary succession has allowed us to reinterpret in detail the sequence of events which led to closure of Neotethys and continental collision in the NW Himalaya. During the Early Cretaceous, the Indian passive margin recorded basaltic magmatic activity. Albian volcanic arenites, probably related to a major extensional tectonic event, are unconformably overlain by an Upper Cretaceous to Paleocene carbonate sequence, with a major quartzarenite episode triggered by the global eustatic sea-level fall at the Cretaceous/Tertiary boundary. At the same time, Neotethyan oceanic crust was being subducted beneath Asia, as testified by calc-alkalic volcanism and forearc basin sedimentation in the Transhimalayan belt. Onset of collision and obduction of the Asian accretionary wedge onto the Indian continental rise was recorded by shoaling of the outer shelf at the Paleocene/Eocene boundary, related to flexural uplift of the passive margin. A few My later, foreland basin volcanic arenites derived from the uplifted Asian subduction complex onlapped onto the Indian continental terrace. All along the Himalaya, marine facies were rapidly replaced by continental redbeds in collisional basins on both sides of the ophiolitic suture. Next, foreland basin sedimentation was interrupted by fold-thrust deformation and final ophiolite emplacement. The observed sequence of events compares favourably with theoretical models of rifted margin to overthrust belt transition and shows that initial phases of continental collision and obduction were completed within 10 to 15 My, with formation of a proto-Himalayan chain by the end of the middle Eocene.
Mots-clé
Himalaya, Passive margin, Continental collision, Ophiolite obduction, Foraminiferal biostratigraphy, Sandstone petrography
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Création de la notice
20/02/2009 19:04
Dernière modification de la notice
16/11/2020 7:08
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