Journal
TECTONOPHYSICS
Volume 628, Issue -, Pages 218-227Publisher
ELSEVIER
DOI: 10.1016/j.tecto.2014.04.047
Keywords
Bouguer gravity anomaly; Isostatic correction; 2-D profile modeling of density structure; High-to-ultra potassic volcanos in North Tibet; Geodynamic cause
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Funding
- Experiment and Integration of Deep Probe Techniques in China (SinoProbe-02) [201011044]
- Natural Science Foundation of China [40774051, 40974060, 41274095]
- Ministry of Science and Technology, China [J1216]
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This paper will help to further constrain geodynamic models for the evolution of northern Tibet through two techniques that employ Bouguer gravity anomaly data: the first is isostatic correction of Bouguer gravity anomalies and the second is 2-D density modeling along a profile at 88.5 degrees E from 30 degrees N to 37 degrees N within the Tibetan Plateau. Areas dominated by volcanic rocks exhibit ultra-low Bouguer gravity anomalies and low isostatic residual anomalies. The 2-D density structure beneath Profile 88.5 degrees E shows a giant upward dome distributed body of low density in the middle-lower crust and mantle beneath the high-to-ultra-potassic areas, suggesting that the original middle and lower crusts were reformed and replaced extensively in the area. Based on existing regional geology and tectonics, geochemical data from magmatic rocks, and geophysical information, this paper proposes that the sustained northward subduction of the Indian plate has resulted in breaking off of the frontal margin of the Asian lithospheric mantle. Subsequently, the original lithosphere was reactivated by thermal-tectonic changes, high-to-ultra potassic volcanoes erupted extensively in the northern Tibetan Plateau during Neogene, and the plateau experienced rapid NE-trending uplift. (C) 2014 Elsevier B.V. All rights reserved.
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