Middle Eocene‐Oligocene anatexis and exhumation of the Greater Himalayan Sequence in central Nepal

Terra Nova ◽  
2021 ◽  
Author(s):  
Zhiqin Xu ◽  
Qin Wang ◽  
Hanwen Dong ◽  
Hui Cao ◽  
Guangwei Li ◽  
...  
Keyword(s):  
Middle Eocene ◽  
Central Nepal ◽  
Greater Himalayan Sequence

Depositional environment of Upper Paleocene – Middle Eocene series of the Lesser Himalaya, Central Nepal

Lithos ◽  
2021 ◽  
Vol 388-389 ◽  
pp. 106060
Author(s):  
Bhupati Neupane ◽  
Junmeng Zhao ◽  
Babu Ram Gyawali ◽  
Yan Deng ◽  
Bishal Maharjan ◽  
...  
Keyword(s):  
Depositional Environment ◽  
Middle Eocene ◽  
Lesser Himalaya ◽  
Central Nepal ◽  
Upper Paleocene

scholarly journals Orogen‐parallel deformation of the Himalayan midcrust: Insights from structural and magnetic fabric analyses of the Greater Himalayan Sequence, Annapurna‐Dhaulagiri Himalaya, central Nepal

Tectonics ◽  
2016 ◽  
Vol 35 (11) ◽  
pp. 2515-2537 ◽  
Author(s):  
A. J. Parsons ◽  
E. C. Ferré ◽  
R. D. Law ◽  
G. E. Lloyd ◽  
R. J. Phillips ◽  
...  
Keyword(s):  
Magnetic Fabric ◽  
Central Nepal ◽  
Greater Himalayan Sequence

scholarly journals Paleomagnetism and Petrochemistry of the Dowar Khola Volcanics, Central Nepal Sub Himalaya

1995 ◽  
Vol 11 ◽  
Author(s):  
Pitambar Gautam ◽  
B. N. Upreti ◽  
Kazunori Arita
Keyword(s):  
Middle Eocene ◽  
Volcanic Rocks ◽  
Sedimentary Rocks ◽  
Continental Flood Basalts ◽  
Remanent Magnetisation ◽  
Early Oligocene ◽  
Central Nepal ◽  
Paleomagnetic Study ◽  
Tectonic Rotation ◽  
River Plain

The doleritic volcanic rocks, which occur in the Sub-Himalaya in east central Nepal, are represented by metric to decimetric (in thickness) sill-like bodies at several stratigraphic levels showing concordant relationship with the predominantly red coloured sedimentary rocks of Pre-Siwalik age. Chemistry of the clinopyroxenes contained in these rocks suggests that they are poor in TiO2 compared to the alkalic rocks and belong to non-alkalic and non-orogenic group basalts (judging from discriminant diagrams: Ti vs. Ca+Na and Ti+Cr vs. Ca. Whole rock chemical analyses on major oxides, trace-elements and REE characteristics (P2O5 vs. Zr and TiO2 vs. Zr plots; rock/OIT, rock/MORB, rock/chondrite spidergrams) indicate affinity to the tholeiitic field and similarity with the within plate basalts (WPB). Spidergrams, Y/Nb (2.06-2.66) vs. Zr/Nb (12.42-13.77) plots and La/Nb (1.34-2.11) ratios for the Dowar Khola volcanics show similarity to the commonly known continental flood basalts (Snake-river plain, Parana and Deccan basalts). Paleomagnetic study on the volcanic rocks reveals magnetite-based characteristic remanent directions, which have NE (SW) declinations with shallow downward (upward) inclinations after tilt-correction. The best inclination estimate of the primary thermo-remanent magnetisation yields a shallow northern paleolatitude (6.4±4.3°N) of acquisition implying the most probable age to be around 45 Ma (younger and older age limits of 35 and 50-52 Ma, respectively). Primary detrital remanent magnetisation with similar orientation is preserved in the red sandstones carried out mainly by haematite and partly by magnetite as well and indicates shallow near-equatorial northern latitudinal paleoposition of the area during the deposition of the sediments. Declination anomalies amount to 35-80° relative to the present day north and increase by an additional 15° if considered with respect to the expected Middle Eocene paleodeclination for the area suggesting a significant clockwise tectonic rotation. Considering the best defined remanence directions, the volcanic episodes and the deposition of associated sedimentary rocks took place sometimes in the lower Tertiary between the Eocene and Early Oligocene.

scholarly journals Eocene partial melting recorded in peritectic garnets from kyanite-gneiss, Greater Himalayan Sequence, central Nepal

2014 ◽  
Vol 412 (1) ◽  
pp. 111-129 ◽  
Author(s):  
Rodolfo Carosi ◽  
Chiara Montomoli ◽  
Antonio Langone ◽  
Alice Turina ◽  
Bernardo Cesare ◽  
...  
Keyword(s):  
Partial Melting ◽  
Central Nepal ◽  
Greater Himalayan Sequence
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