{"title":"Crustal Structure Beneath the Namche Barwa Massif, Eastern Himalayan Syntaxis: Evidence of Magma Underplating?","authors":"Siyuan Cheng, Xuzhang Shen, Lun Li, Wentian Wang, Rui Gao, Mian Liu, Haifeng Li","doi":"10.1029/2024JB030249","DOIUrl":null,"url":null,"abstract":"<p>The Namche Barwa massif (NBM) in the Eastern Himalayan Syntaxis (EHS) hosts some of the most active Cenozoic crustal deformation, magmatism, metamorphism, and extreme topographic relief on earth. The crust-mantle dynamics responsible for the tectono-magmatism in the NBM remains debated. We image the detailed crustal structures under the NBM using the recordings of a dense seismic array of 400 3-component node geophones and 4,290 P-wave receiver functions (PRFs). Our results show a wide range of negative seismic phases in the middle and lower crust and weak Moho signal in the northern part of the NBM, under the Yarlung-Zangbo River (YZR). The upper crustal discontinuities show “hut” shape structures, and these features were validated with the forward simulation and PRFs from three broadband seismic stations in the region. These crustal structures indicate the presence of magma underplating in the upper mantle under the NBM.</p>","PeriodicalId":15864,"journal":{"name":"Journal of Geophysical Research: Solid Earth","volume":"130 2","pages":""},"PeriodicalIF":3.9000,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Geophysical Research: Solid Earth","FirstCategoryId":"89","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1029/2024JB030249","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}
引用次数: 0
Abstract
The Namche Barwa massif (NBM) in the Eastern Himalayan Syntaxis (EHS) hosts some of the most active Cenozoic crustal deformation, magmatism, metamorphism, and extreme topographic relief on earth. The crust-mantle dynamics responsible for the tectono-magmatism in the NBM remains debated. We image the detailed crustal structures under the NBM using the recordings of a dense seismic array of 400 3-component node geophones and 4,290 P-wave receiver functions (PRFs). Our results show a wide range of negative seismic phases in the middle and lower crust and weak Moho signal in the northern part of the NBM, under the Yarlung-Zangbo River (YZR). The upper crustal discontinuities show “hut” shape structures, and these features were validated with the forward simulation and PRFs from three broadband seismic stations in the region. These crustal structures indicate the presence of magma underplating in the upper mantle under the NBM.
期刊介绍：
The Journal of Geophysical Research: Solid Earth serves as the premier publication for the breadth of solid Earth geophysics including (in alphabetical order): electromagnetic methods; exploration geophysics; geodesy and gravity; geodynamics, rheology, and plate kinematics; geomagnetism and paleomagnetism; hydrogeophysics; Instruments, techniques, and models; solid Earth interactions with the cryosphere, atmosphere, oceans, and climate; marine geology and geophysics; natural and anthropogenic hazards; near surface geophysics; petrology, geochemistry, and mineralogy; planet Earth physics and chemistry; rock mechanics and deformation; seismology; tectonophysics; and volcanology.
JGR: Solid Earth has long distinguished itself as the venue for publication of Research Articles backed solidly by data and as well as presenting theoretical and numerical developments with broad applications. Research Articles published in JGR: Solid Earth have had long-term impacts in their fields.
JGR: Solid Earth provides a venue for special issues and special themes based on conferences, workshops, and community initiatives. JGR: Solid Earth also publishes Commentaries on research and emerging trends in the field; these are commissioned by the editors, and suggestion are welcome.
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