{"title":"Tectonic interplay between the South Tibetan Detachment System and the North Himalayan genesis dome","authors":"Xinyu Dong, Wenhui Li, Zhanwu Lu, Xingfu Huang, Rui Gao","doi":"10.5194/egusphere-2024-2468","DOIUrl":null,"url":null,"abstract":"<strong>Abstract.</strong> The formation and evolution of the Himalayas are intimately linked to the South Tibetan Detachment System (STDS) in the northern Himalayas. Despite ongoing controversies about the deep structural style of the STDS, understanding the emplacement mechanism of the leucogranite in the North Himalayan gneiss domes (NHGDs) remains challenging due to insufficient information about deep structures. In this study, we characterized the subsurface structure of the STDS on the eastern side of the Tethys Himalayas and analyze the relationship between STDS tectonic activity and the formation of the NHGD. We conducted a deep seismic reflection survey with a line length of over 135 km and performed geological field investigations in the eastern Tethys Himalayas (92° E) from 2017 to 2018. Our findings indicate that the STDS presents as a roof thrust fault of duplex structures in the eastern Tethys Himalayas and displays characteristics of two-phase denudation (STDS-1 and STDS-2) from the Miocene, corresponding to the two-phase Tethys tectonic uplift. The first phase of denudation (STDS-1) led to the exposure of its structure around the Yarlhashampo dome. Both STDS-1 and STDS-2 denudation activities play crucial roles in promoting the partial melting of middle crust metasediments, which subsequently migrated upward to form leucogranite through diapirism in the core of the Yarlhashampo dome.","PeriodicalId":21912,"journal":{"name":"Solid Earth","volume":"12 1","pages":""},"PeriodicalIF":3.2000,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Solid Earth","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.5194/egusphere-2024-2468","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
Abstract. The formation and evolution of the Himalayas are intimately linked to the South Tibetan Detachment System (STDS) in the northern Himalayas. Despite ongoing controversies about the deep structural style of the STDS, understanding the emplacement mechanism of the leucogranite in the North Himalayan gneiss domes (NHGDs) remains challenging due to insufficient information about deep structures. In this study, we characterized the subsurface structure of the STDS on the eastern side of the Tethys Himalayas and analyze the relationship between STDS tectonic activity and the formation of the NHGD. We conducted a deep seismic reflection survey with a line length of over 135 km and performed geological field investigations in the eastern Tethys Himalayas (92° E) from 2017 to 2018. Our findings indicate that the STDS presents as a roof thrust fault of duplex structures in the eastern Tethys Himalayas and displays characteristics of two-phase denudation (STDS-1 and STDS-2) from the Miocene, corresponding to the two-phase Tethys tectonic uplift. The first phase of denudation (STDS-1) led to the exposure of its structure around the Yarlhashampo dome. Both STDS-1 and STDS-2 denudation activities play crucial roles in promoting the partial melting of middle crust metasediments, which subsequently migrated upward to form leucogranite through diapirism in the core of the Yarlhashampo dome.
期刊介绍:
Solid Earth (SE) is a not-for-profit journal that publishes multidisciplinary research on the composition, structure, dynamics of the Earth from the surface to the deep interior at all spatial and temporal scales. The journal invites contributions encompassing observational, experimental, and theoretical investigations in the form of short communications, research articles, method articles, review articles, and discussion and commentaries on all aspects of the solid Earth (for details see manuscript types). Being interdisciplinary in scope, SE covers the following disciplines:
geochemistry, mineralogy, petrology, volcanology;
geodesy and gravity;
geodynamics: numerical and analogue modeling of geoprocesses;
geoelectrics and electromagnetics;
geomagnetism;
geomorphology, morphotectonics, and paleoseismology;
rock physics;
seismics and seismology;
critical zone science (Earth''s permeable near-surface layer);
stratigraphy, sedimentology, and palaeontology;
rock deformation, structural geology, and tectonics.