globalchange  > 科学计划与规划
DOI: 10.1002/2015GL065018
Mantle-driven uplift of Hangai Dome: New seismic constraints from adjoint tomography
Author: Chen M.; Niu F.; Liu Q.; Tromp J.
Source Publication: Geophysical Research Letters
ISSN: 0094-9138
EISSN: 1944-8869
Publishing Year: 2015
Volume: 42, Issue:17
pages begin: 6967
pages end: 6974
Language: 英语
Keyword: adjoint tomography ; decompression melting ; Hangai Dome ; isostasy ; mantle upwelling ; partial melt
Scopus Keyword: Melting ; Seismology ; Shear flow ; Shear waves ; Structural geology ; Tomography ; Waveform analysis ; Adjoints ; Decompression melting ; isostasy ; Mantle upwellings ; Partial melt ; Domes ; anisotropy ; data set ; decompression ; dome ; elevation ; isostasy ; lithosphere ; melting ; S-wave ; tomography ; uplift ; upper mantle ; upwelling ; waveform analysis ; wind shear ; Far East ; Mongolia
English Abstract: The origin of Hangai Dome, an unusual large-scale, high-elevation low-relief landform in central Mongolia, remains enigmatic partly due to lack of constraints on its underlying seismic structure. Using adjoint tomography - a full waveform tomographic technique - and a large seismic waveform data set in East Asia, we discover beneath the dome a deep low shear wave speed (low-V) conduit indicating a slightly warmer (54 K to 127 K) upwelling from the transition zone. This upwelling is spatially linked to a broader uppermost mantle low-V region underlying the dome. Further observations of high compressional to shear wave speed ratios and positive radial anisotropy in the low-V region suggest partial melting and horizontal melt transport. We propose that the mantle upwelling induced decompression melting in the uppermost mantle and that excess heat associated with melt transport modified the lithosphere that isostatically compensates the surface uplift at upper mantle depths (>80 km). ©2015. American Geophysical Union. All Rights Reserved.
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Affiliation: Department of Earth Science, Rice University, Houston, TX, United States

Recommended Citation:
Chen M.,Niu F.,Liu Q.,et al. Mantle-driven uplift of Hangai Dome: New seismic constraints from adjoint tomography[J]. Geophysical Research Letters,2015-01-01,42(17).
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