Early Oligocene partial melting via biotite dehydration melting and prolonged low-pressure–low-temperature metamorphism of the upper High Himalaya Crystalline Sequence in the far east of Nepal

T. Imayama; T. Takeshita; K. Yi; M. Fukuyama

doi:10.1144/sp481.2

journal article Apr 17, 2018

Early Oligocene partial melting via biotite dehydration melting and prolonged low-pressure–low-temperature metamorphism of the upper High Himalaya Crystalline Sequence in the far east of Nepal

T. Imayama

T. Takeshita

K. Yi

M. Fukuyama

Geological Society, London, Special Publications Vol. 481 No. 1 pp. 147-173 · Geological Society of London

View at Publisher Save 10.1144/sp481.2

Abstract

Abstract

Early Oligocene partial melting and prolonged low-pressure–low-temperature (low-P/T) metamorphism were investigated in migmatites and orthogneisses from the upper High Himalaya Crystalline Sequence (HHCS) in the far east of Nepal. The migmatites were formed by biotite dehydration melting at
c.
800°C from 33 to 25 Ma. Cordierite was only produced at shallow crustal levels at pressures <6 kbar. After Early Oligocene partial melting, the low-P/T metamorphism continued until 17 Ma during exhumation of the cordierite-bearing migmatites. Early Oligocene biotite dehydration melting in the upper HHCS occurred at different times and locations from the Early Miocene muscovite dehydration melting in the underlying HHCS and the metamorphic discontinuity was accompanied by thrusting of the High Himalayan Discontinuity at
c.
27–19 Ma. Pervasive partial melting and prolonged low-P/T metamorphism in the upper HHCS is more compatible with a lateral southwards channel flow of the upper HHCS along the High Himalayan Discontinuity, whereas current channel flow models explaining the exhumation of the HHCS as driven only by the coupled activity of the Main Central Thrust and South Tibetan Detachment have faced difficulties in explaining the timing of the low-P/T metamorphism observed in the upper HHCS.

Supplementary material:
The representative cordierite compositions from the cordierite migmatites, the far east of Nepal are available at
https://doi.org/10.6084/m9.figshare.c.4068815

Topics

No keywords indexed for this article. Browse by subject →

References

113

[1]

10.1111/jmg.12197

[2]

10.1130/b25659.1

[3]

10.1130/l437.1

[4]

10.1016/0040-1951(83)90258-5

[5]

10.1007/s00410-009-0412-7

[6]

Himalayan tectonics explained by extrusion of a low-viscosity crustal channel coupled to focused surface denudation

C. Beaumont, R. A. Jamieson, M. H. Nguyen et al.

Nature 10.1038/414738a

[7]

10.1029/2003jb002809

[8]

10.1016/j.epsl.2006.01.045

[9]

10.1016/0037-0738(93)90042-4

[10]

10.1130/spe269-p1

[11]

10.1029/2008tc002400

[12]

10.1130/b31471.1

[13]

10.1016/j.epsl.2006.12.006

[14]

10.1016/0012-821x(87)90227-5

[15]

Multivariable phase diagrams; an algorithm based on generalized thermodynamics

J. A. D. Connolly

American Journal of Science 10.2475/ajs.290.6.666

[16]

10.1029/2009gc002540

[17]

10.1086/605994

[18]

Tectonic Implications of U-Pb Zircon Ages of the Himalayan Orogenic Belt in Nepal

P. G. DeCelles, G. E. Gehrels, J. Quade et al.

Science 10.1126/science.288.5465.497

[19]

10.1016/j.lithos.2007.09.009

[20]

10.1016/s0009-2541(02)00156-0

[21]

10.1016/j.lithos.2016.08.038

[22]

10.1029/2011tc002868

[23]

10.1029/2000tc001204

[24]

10.1144/gsl.sp.2006.268.01.01

[25]

10.1016/j.gr.2006.05.003

[26]

10.1093/petrology/egp036

[27]

10.1016/j.lithos.2010.05.003

[28]

Partial Melting in the Higher Himalayan Crystallines of Eastern Nepal: the Effect of Decompression and Implications for the ‘Channel Flow’ Model

Chiara Groppo, Franco Rolfo, Aphrodite Indares

Journal of Petrology 10.1093/petrology/egs009

[29]

10.1111/jmg.12014

[30]

10.1016/s0012-821x(02)00482-x

[31]

10.1144/0016-76492006-133

[32]

10.1029/94tc01611

[33]

10.1111/j.1525-1314.2004.00511.x

[34]

10.1080/00206814.2014.986669

[35]

10.1016/s0040-1951(96)00287-9

[36]

Tectonics of the Himalaya and southern Tibet from two perspectives

K. V. Hodges

Geological Society of America Bulletin 10.1130/0016-7606(2000)112<324:tothas>2.0.co;2

[37]

10.1029/96tc01791

[38]

10.2138/am-1996-11-1215

[39]

10.1111/j.1525-1314.1998.00140.x

[40]

10.1127/ejm/10/3/0395

[41]

10.1144/gsl.sp.2006.268.01.19

[42]

10.1016/j.epsl.2012.06.030

[43]

10.1130/0091-7613(2001)029<1007:pottsa>2.0.co;2

[44]

Pressure–temperature–time–deformation path of kyanite-bearing migmatitic paragneiss in the Kali Gandaki valley (Central Nepal): Investigation of Late Eocene–Early Oligocene melting processes

Salvatore Iaccarino, Chiara Montomoli, Rodolfo Carosi et al.

Lithos 10.1016/j.lithos.2015.06.005

[45]

10.1007/s00015-014-0159-7

[46]

10.1016/j.tecto.2007.11.051

[47]

10.2138/am.2013.4267

[48]

10.1111/j.1525-1314.2010.00879.x

[49]

Two-stage partial melting and contrasting cooling history within the Higher Himalayan Crystalline Sequence in the far-eastern Nepal Himalaya

Takeshi Imayama, Toru Takeshita, Keewook Yi et al.

Lithos 10.1016/j.lithos.2011.12.004

[50]

10.1111/j.1525-1314.2008.00788.x

Showing 50 of 113 references

Cited By

27

Melt reactions and timescales of melting in pelitic rocks—a case study from the Garhwal Himalaya

C. J. Oldman, C. J. Warren · 2025

Contributions to Mineralogy and Pet...

Granitoid Metasomatism and Giant Quartz Vein Formation by Mineral Replacement: Insights from the Canigó Massif, Eastern Pyrenees

Eloi González-Esvertit, Àngels Canals · 2025

Journal of Petrology

Secular change of metamorphic features in the Himalayan orogen during the Cenozoic and its tectonic implications

Min Ji, Xiao-Ying Gao · 2024

Earth-Science Reviews

Eocene to Miocene metamorphic evolution and tectonic implication of the Ilam Nappe in Nepal Himalaya: Constraints from P–T conditions and monazite petrochronology

Takeshi Imayama, Ryuhei Hoshino · 2022

Journal of Asian Earth Sciences

Diverse Anatexis in the Main Central Thrust Zone, Eastern Nepal: Implications for Melt Evolution and Exhumation Process of the Himalaya

Shuaiqi Liu, Guibin Zhang · 2022

Journal of Petrology

Metrics

27

Citations

113

References

Details

Published: Apr 17, 2018
Vol/Issue: 481(1)
Pages: 147-173
License: View

Authors

T

T. Imayama

Research Institute of Natural Sciences, Okayama University of Science, Okayama 700-0005, Japan

T

T. Takeshita

Department of Natural History Sciences, Hokkaido University, Sapporo 060-0810, Japan

K

K. Yi

Geochronology Team, Korea Basic Science Institute, Chungbuk 363-883, Republic of Korea

M

M. Fukuyama

Graduate School of Engineering Science, Akita University, Akita 010-8502, Japan

Funding

Japan Society for the Promotion of Science Award: 16H07376

Cite This Article

T. Imayama, T. Takeshita, K. Yi, et al. (2018). Early Oligocene partial melting via biotite dehydration melting and prolonged low-pressure–low-temperature metamorphism of the upper High Himalaya Crystalline Sequence in the far east of Nepal. Geological Society, London, Special Publications, 481(1), 147-173. https://doi.org/10.1144/sp481.2

Early Oligocene partial melting via biotite dehydration melting and prolonged low-pressure–low-temperature metamorphism of the upper High Himalaya Crystalline Sequence in the far east of Nepal

You May Also Like