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- Chen, LinChinese Academy of Sciences, Beijing, China (author)
Seismically constrained thermo-rheological structure of the eastern Tibetan margin : Implication for lithospheric delamination
- Article/chapterEnglish2014
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- Elsevier,2014
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- LIBRIS-ID:oai:DiVA.org:liu-109593
- https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-109593URI
- https://doi.org/10.1016/j.tecto.2013.11.005DOI
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- Language:English
- Summary in:English
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- The eastern Tibetan margin bordered by the Longmen Shan range exhibits significant lateral differences in the lithospheric structure and thermal state. To investigate the roles of these differences in mountain building, we construct a thermo-rheological model along a wide-angle seismic profile across the eastern Tibetan margin based on recent seismic and thermal observations. The thermal modeling is constrained by the surface heat flow data and crustal P wave velocity model. The construction of the theological envelopes is based on rock mechanics results, and involves two types of rheology: a weak case where the lower crust is felsic granulite and the lithospheric mantle is wet peridotite, and a strong case where the lower crust is mafic granulite and the lithospheric mantle is dry peridotite. The results demonstrate: (1) one high-temperature anomaly exists within the uppermost mantle beneath eastern Tibet, indicating that the crust in eastern Tibet is remarkably warmer than that in the Sichuan basin, and (2) the rheological strength of the lithospheric mantle beneath eastern Tibet is considerably weaker than that beneath the Sichuan basin. The rheological profiles are in accord with seismicity distribution. By combining these results with the observed crustal/lithospheric architecture, Pn velocity distribution and magmatism in the eastern Tibetan margin, we suggest that the delamination of a thickened lithospheric mantle root beneath eastern Tibet is responsible for the growth of the eastern Tibetan margin.
Subject headings and genre
- NATURVETENSKAP Matematik hsv//swe
- NATURAL SCIENCES Mathematics hsv//eng
- Lithosphere rheology; Temperature; Seismic velocity; Eastem Tibetan margin; Delamination
Added entries (persons, corporate bodies, meetings, titles ...)
- Berntsson, FredrikLinköpings universitet,Matematik och tillämpad matematik,Tekniska högskolan(Swepub:liu)frebe13 (author)
- Zhang, ZhongjieChinese Academy of Sciences, Beijing, China (author)
- Wang, PengChinese Academy of Sciences, Guangzhou, China; University of Chinese Academy of Sciences, Beijing, China (author)
- Wu, JingChinese Academy of Sciences, Beijing, China (author)
- Xu, TaoChinese Academy of Sciences, Beijing, China (author)
- Chinese Academy of Sciences, Beijing, ChinaMatematik och tillämpad matematik (creator_code:org_t)
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- In:Tectonophysics: Elsevier627, s. 122-1340040-19511879-3266
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