Skip to main content

Mantle-driven uplift of Hangai Dome: New seismic constraints from adjoint tomography

Author(s): Chen, Min; Niu, Fenglin; Liu, Qinya; Tromp, Jeroen

To refer to this page use:
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).
Publication Date: 10-Aug-2015
Citation: Chen, Min, Fenglin Niu, Qinya Liu, and Jeroen Tromp. "Mantle‐driven uplift of Hangai Dome: New seismic constraints from adjoint tomography." Geophysical Research Letters 42, no. 17 (2015): 6967-6974. doi:10.1002/2015GL065018.
DOI: doi:10.1002/2015GL065018
ISSN: 0094-8276
EISSN: 1944-8007
Pages: 6967 - 6974
Type of Material: Journal Article
Journal/Proceeding Title: Geophysical Research Letters
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

Items in OAR@Princeton are protected by copyright, with all rights reserved, unless otherwise indicated.