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In-sequence buoyancy extrusion of the Himalayan Metamorphic Core, central Nepal: Constraints from monazite petrochronology and thermobarometry
Khanal, Gautam Prashad1,2,3; Wang, Jia-Min1; Wu, Fu-Yuan1; Wang, Jiang-Gang1; Yang, Lei1
2020-09-01
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
Volume199Pages:24
AbstractRecent identification of tectono-metamorphic discontinuities within the Himalayan metamorphic core has challenged previous understanding of mountain-building processes/models during continental collision. However, their exact position, spatial extent, and temporal evolution still remain in debate. Monazite petro-chronology and thermobarometry have been applied to metapelites of the Gyirong-Syabrubensi-Langtang transect in central Nepal. Peak metamorphic temperatures and pressures were determined by conventional thermobarometry and Zr-in Rutile thermometry. P-T conditions increase structurally upward from 540-580 degrees C, 8-10 kbar at LHS to 640-710 degrees C, 8-12 kbar at lower GHC, and 680-720 degrees C, 6-9 kbar at upper GHC. Petrochronology studies indicate prograde metamorphism in the LHS, partial melting of 20-18 Ma in the lower GHC and prolonged partial melting at 29-23 Ma in the upper GHC, demonstrating a diachronism across these units. The Rasuwagadhi Shear Zone (RSZ), is marked by a jump in T/depth and peak metamorphic timing from lower GHC (<25 degrees C/km, similar to 19 Ma) to upper GHC (>30 degrees C/km, similar to 29 Ma), and can be correlated with the regional High Himalayan Discontinuity recently identified within the GHC in other Himalayan transects. This shear zone acted almost synchronously with the South Tibetan Detachment around 24-18 Ma and was relayed by movement along the Main Central Thrust after 18 Ma, presenting south-ward in-sequence thrust propagation style. Therefore, a hybrid model, In-sequence Buoyancy Extrusion that involves a combination of underplating and buoyancy mechanisms is proposed to explain the overall exhumation of HMC, and perhaps is applicable to metamorphic core in similar large and hot collisional orogen.
KeywordTectono-metamorphic discontinuities Monazite petrochronology Thermobarometry Partial melting Underplating Buoyancy extrusion
DOI10.1016/j.jseaes.2020.104406
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CAS-TWAS President's Fellowship program ; CAS-TWAS President's Fellowship program ; CAS-TWAS President's Fellowship program ; CAS-TWAS President's Fellowship program ; Department of Mines and Geology, Nepal Government ; Department of Mines and Geology, Nepal Government ; Department of Mines and Geology, Nepal Government ; Department of Mines and Geology, Nepal Government ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CAS-TWAS President's Fellowship program ; CAS-TWAS President's Fellowship program ; CAS-TWAS President's Fellowship program ; CAS-TWAS President's Fellowship program ; Department of Mines and Geology, Nepal Government ; Department of Mines and Geology, Nepal Government ; Department of Mines and Geology, Nepal Government ; Department of Mines and Geology, Nepal Government ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CAS-TWAS President's Fellowship program ; CAS-TWAS President's Fellowship program ; CAS-TWAS President's Fellowship program ; CAS-TWAS President's Fellowship program ; Department of Mines and Geology, Nepal Government ; Department of Mines and Geology, Nepal Government ; Department of Mines and Geology, Nepal Government ; Department of Mines and Geology, Nepal Government ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CAS-TWAS President's Fellowship program ; CAS-TWAS President's Fellowship program ; CAS-TWAS President's Fellowship program ; CAS-TWAS President's Fellowship program ; Department of Mines and Geology, Nepal Government ; Department of Mines and Geology, Nepal Government ; Department of Mines and Geology, Nepal Government ; Department of Mines and Geology, Nepal Government
WOS KeywordMAIN CENTRAL THRUST ; SOUTH TIBETAN DETACHMENT ; LANGTANG-NATIONAL-PARK ; P-T PATHS ; TECTONIC EVOLUTION ; EASTERN NEPAL ; TECTONOMETAMORPHIC DISCONTINUITIES ; CRYSTALLINE COMPLEX ; CHANNEL FLOW ; MIDCRUSTAL DISCONTINUITIES
Language英语
Funding ProjectNational Natural Science Foundation of China[41972065] ; National Natural Science Foundation of China[41888101] ; National Natural Science Foundation of China[41602054] ; CAS-TWAS President's Fellowship program ; Department of Mines and Geology, Nepal Government
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CAS-TWAS President's Fellowship program ; CAS-TWAS President's Fellowship program ; CAS-TWAS President's Fellowship program ; CAS-TWAS President's Fellowship program ; Department of Mines and Geology, Nepal Government ; Department of Mines and Geology, Nepal Government ; Department of Mines and Geology, Nepal Government ; Department of Mines and Geology, Nepal Government ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CAS-TWAS President's Fellowship program ; CAS-TWAS President's Fellowship program ; CAS-TWAS President's Fellowship program ; CAS-TWAS President's Fellowship program ; Department of Mines and Geology, Nepal Government ; Department of Mines and Geology, Nepal Government ; Department of Mines and Geology, Nepal Government ; Department of Mines and Geology, Nepal Government ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CAS-TWAS President's Fellowship program ; CAS-TWAS President's Fellowship program ; CAS-TWAS President's Fellowship program ; CAS-TWAS President's Fellowship program ; Department of Mines and Geology, Nepal Government ; Department of Mines and Geology, Nepal Government ; Department of Mines and Geology, Nepal Government ; Department of Mines and Geology, Nepal Government ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CAS-TWAS President's Fellowship program ; CAS-TWAS President's Fellowship program ; CAS-TWAS President's Fellowship program ; CAS-TWAS President's Fellowship program ; Department of Mines and Geology, Nepal Government ; Department of Mines and Geology, Nepal Government ; Department of Mines and Geology, Nepal Government ; Department of Mines and Geology, Nepal Government
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000546703200007
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/97126
Collection岩石圈演化国家重点实验室
Corresponding AuthorWang, Jia-Min
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100029, Peoples R China
3.Dept Mines & Geol, Kathmandu, Nepal
First Author AffilicationState Key Laboratory of Lithospheric Evolution
Corresponding Author AffilicationState Key Laboratory of Lithospheric Evolution
Recommended Citation
GB/T 7714
Khanal, Gautam Prashad,Wang, Jia-Min,Wu, Fu-Yuan,et al. In-sequence buoyancy extrusion of the Himalayan Metamorphic Core, central Nepal: Constraints from monazite petrochronology and thermobarometry[J]. JOURNAL OF ASIAN EARTH SCIENCES,2020,199:24.
APA Khanal, Gautam Prashad,Wang, Jia-Min,Wu, Fu-Yuan,Wang, Jiang-Gang,&Yang, Lei.(2020).In-sequence buoyancy extrusion of the Himalayan Metamorphic Core, central Nepal: Constraints from monazite petrochronology and thermobarometry.JOURNAL OF ASIAN EARTH SCIENCES,199,24.
MLA Khanal, Gautam Prashad,et al."In-sequence buoyancy extrusion of the Himalayan Metamorphic Core, central Nepal: Constraints from monazite petrochronology and thermobarometry".JOURNAL OF ASIAN EARTH SCIENCES 199(2020):24.
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