Tectonic implications of felsic tuffs within the Lower Miocene Gangrinboche conglomerates, southern Tibet

Aitchison, Jonathan C., Ali, Jason R., Chan, Angel, Davis, Aileen M. and Lo, Ching-Hua (2009) Tectonic implications of felsic tuffs within the Lower Miocene Gangrinboche conglomerates, southern Tibet. Journal of Asian Earth Sciences, 34 3: 287-297. doi:10.1016/j.jseaes.2008.05.008


Author Aitchison, Jonathan C.
Ali, Jason R.
Chan, Angel
Davis, Aileen M.
Lo, Ching-Hua
Title Tectonic implications of felsic tuffs within the Lower Miocene Gangrinboche conglomerates, southern Tibet
Journal name Journal of Asian Earth Sciences   Check publisher's open access policy
ISSN 1367-9120
1878-5786
Publication date 2009
Year available 2009
Sub-type Article (original research)
DOI 10.1016/j.jseaes.2008.05.008
Volume 34
Issue 3
Start page 287
End page 297
Total pages 11
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Language eng
Formatted abstract
Felsic tuffs are interbedded with the Gangrinboche conglomerates adjacent to the Yarlung Tsangpo suture zone in southern Tibet. Laser Ar/Ar dating of mineral separates indicates they are of Early Miocene age. Such tuffs are most likely an eruptive manifestation of geochemically indistinguishable coeval felsic (adakitic) intrusions that are widely reported across southern Tibet. The considerable lateral (E-W) extent of the Gangrinboche conglomerates and their depositional setting indicates sediment accumulation in an overall N-S compressional regime and thereby places important constraints on the tectonic setting in which magmatism initiated. The conglomerates were folded and truncated during back-thrusting associated with development of the north-directed Great Counter thrust. As N-S trending rifts associated with E-W extension of the Tibetan Plateau cut both the conglomerates and this thrust system it can be inferred that post-collisional volcanism is unlikely to have been genetically linked to later E-W extension. Early Miocene slab break-off beneath Tibet provides a model that appears to be consistent with petrogenesis of the associated magmatic suite, which requires a lowermost crust or lithospheric mantle generation, molasse accumulation, and uplift and emplacement of North Himalayan gneiss domes
Keyword Adakite
Collision
Dacite
Miocene
Molasse
Slab break off
Tibet
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Geography, Planning and Environmental Management Publications
 
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Created: Wed, 29 Jul 2015, 11:08:17 EST by Helen Smith on behalf of School of Geography, Planning & Env Management