气候变化领域集成服务门户(CCPortal): The Mabja Dome Structure in Southern Tibet Revealed by Deep Seismic Reflection Data and Its Tectonic Implications

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DOI	10.1029/2020JB020265
	The Mabja Dome Structure in Southern Tibet Revealed by Deep Seismic Reflection Data and Its Tectonic Implications
	Li H.; Gao R.; Li W.; Carbonell R.; Yelisetti S.; Huang X.; Shi Z.; Lu Z.
发表日期	2021
ISSN	21699313
卷号	126 期号:4
英文摘要	The ongoing India-Asia collision has led to the formation of the northern Himalayan gneiss domes belt in southern Tibet. The domes are the result of the ongoing convergence and were formed by geological processes that may include crustal thickening, metamorphism, partial melting, and exhumation of middle crustal rocks to the surface. A combination of compressional, extensional, and diapiric processes has been invoked to explain the formation and evolution of these domes. Differentiating among these competing hypotheses requires well-defined geophysical images of the internal structure of the domes. The Mabja dome is the largest dome within the northern Himalayan gneiss domes belt. A 70-km long deep seismic reflection profile across Mabja dome was acquired in 2016. The seismic data could provide new information about the structural elements beneath the domes to the depth of 25 Km. We address the structure of the Mabja dome by conducting an integrated analysis of shallow crustal velocity structure and a normal-incidence seismic reflection image of deeper crust. Our work suggests that the Mabja dome is underlain by shear zones at depths of 10–15 km and two high-velocity bodies at depths of 3 km possibly representing the eclogitic-facies rocks or mafic intrusions. We propose that the dome formation may have been controlled by collision-induced north-south shortening expressed by thrust stacking of middle crustal rocks, which led to the doming of the upper-crustal rocks. The proposed mechanism inferred for Mabja dome can be applied to interpret the widespread domes throughout the southern Tibet and other related structures in orogenic mountain belts. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	compression setting; deep seismic reflection; full waveform tomography; southern Tibet; the Mabja dome
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187229
作者单位	Chinese Academy of Geological Sciences, Beijing, China; Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, China; School of Earth Sciences and Engineering, Sun Yat-sen University, Guangzhou, China; Geosciences Barcelona, GEO3BCN-CSIC, Barcelona, Spain; Department of Physics and Geosciences, Texas A&M University-Kingsville, Kingsville, TX, United States
推荐引用方式 GB/T 7714	Li H.,Gao R.,Li W.,et al. The Mabja Dome Structure in Southern Tibet Revealed by Deep Seismic Reflection Data and Its Tectonic Implications[J],2021,126(4).
APA	Li H..,Gao R..,Li W..,Carbonell R..,Yelisetti S..,...&Lu Z..(2021).The Mabja Dome Structure in Southern Tibet Revealed by Deep Seismic Reflection Data and Its Tectonic Implications.Journal of Geophysical Research: Solid Earth,126(4).
MLA	Li H.,et al."The Mabja Dome Structure in Southern Tibet Revealed by Deep Seismic Reflection Data and Its Tectonic Implications".Journal of Geophysical Research: Solid Earth 126.4(2021).