{"title":"The crustal structure of southeast Tibet from joint inversion of surface wave dispersion and gravity anomaly data","authors":"","doi":"10.1016/j.jseaes.2024.106258","DOIUrl":null,"url":null,"abstract":"<div><p>Southeast (SE) Tibet has become a focal point of scientific interest, with an ongoing debate about the presence of crustal flow channels in the region. We built a high-resolution crustal velocity and density model of SE Tibet from joint inversion of surface wave dispersion and gravity anomaly data. We used a 3D joint inversion method to invert for the crustal S-wave velocity and density structure. The joint inversion enhances both model resolution and robustness in comparison to traditional travel-time inversion of surface waves. A notable high velocity anomaly is evident in the crust of the Panzhihua area, potentially indicating an association with the Emeishan Large Igneous Province. We found obviously low velocity and low density anomalies in the middle-lower crust, suggesting that the crust of SE Tibet is ductile and may promote crustal flow. Additionally, there is an obvious low velocity and low density anomaly beneath the Tengchong volcano, suggesting the possible presence of a magma chamber beneath this region. This low-V anomaly beneath Tengchong volcano may be connected to the crustal low velocity channel in SE Tibet.</p></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":null,"pages":null},"PeriodicalIF":2.7000,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Asian Earth Sciences","FirstCategoryId":"89","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1367912024002530","RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Southeast (SE) Tibet has become a focal point of scientific interest, with an ongoing debate about the presence of crustal flow channels in the region. We built a high-resolution crustal velocity and density model of SE Tibet from joint inversion of surface wave dispersion and gravity anomaly data. We used a 3D joint inversion method to invert for the crustal S-wave velocity and density structure. The joint inversion enhances both model resolution and robustness in comparison to traditional travel-time inversion of surface waves. A notable high velocity anomaly is evident in the crust of the Panzhihua area, potentially indicating an association with the Emeishan Large Igneous Province. We found obviously low velocity and low density anomalies in the middle-lower crust, suggesting that the crust of SE Tibet is ductile and may promote crustal flow. Additionally, there is an obvious low velocity and low density anomaly beneath the Tengchong volcano, suggesting the possible presence of a magma chamber beneath this region. This low-V anomaly beneath Tengchong volcano may be connected to the crustal low velocity channel in SE Tibet.
期刊介绍:
Journal of Asian Earth Sciences has an open access mirror journal Journal of Asian Earth Sciences: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review.
The Journal of Asian Earth Sciences is an international interdisciplinary journal devoted to all aspects of research related to the solid Earth Sciences of Asia. The Journal publishes high quality, peer-reviewed scientific papers on the regional geology, tectonics, geochemistry and geophysics of Asia. It will be devoted primarily to research papers but short communications relating to new developments of broad interest, reviews and book reviews will also be included. Papers must have international appeal and should present work of more than local significance.
The scope includes deep processes of the Asian continent and its adjacent oceans; seismology and earthquakes; orogeny, magmatism, metamorphism and volcanism; growth, deformation and destruction of the Asian crust; crust-mantle interaction; evolution of life (early life, biostratigraphy, biogeography and mass-extinction); fluids, fluxes and reservoirs of mineral and energy resources; surface processes (weathering, erosion, transport and deposition of sediments) and resulting geomorphology; and the response of the Earth to global climate change as viewed within the Asian continent and surrounding oceans.