Normal faulting in central Tibet since at least 13.5 Myr ago

Peter M. Blisniuk (), Bradley R. Hacker, Johannes Glodny, Lothar Ratschbacher, Siwen Bi, Zhenhan Wu, Michael O. McWilliams and Andy Calvert
Additional contact information
Peter M. Blisniuk: Institut für Geowissenschaften, Universität Potsdam
Bradley R. Hacker: University of California
Johannes Glodny: GeoForschungsZentrum Potsdam
Lothar Ratschbacher: Institut für Geologie, Technische Universität Bergakademie Freiberg
Siwen Bi: Institute of Geomechanics, Chinese Academy of Geological Sciences
Zhenhan Wu: Institute of Geomechanics, Chinese Academy of Geological Sciences
Michael O. McWilliams: Stanford University
Andy Calvert: University of California

Nature, 2001, vol. 412, issue 6847, 628-632

Abstract: Abstract Tectonic models for the evolution of the Tibetan plateau interpret observed east–west thinning of the upper crust to be the result of either increased potential energy of elevated crust1 or geodynamic processes that may be unrelated to plateau formation2,3,4,5,6. A key piece of information needed to evaluate these models is the timing of deformation within the plateau. The onset of normal faulting has been estimated to have commenced in southern Tibet between about 14 Myr ago7 and about 8 Myr ago8 and, in central Tibet, about 4 Myr ago9. Here, however, we report a minimum age of approximately 13.5 Myr for the onset of graben formation in central Tibet, based on mineralization ages determined with Rb–Sr and 40Ar–39Ar data that post-date a major graben-bounding normal fault. These data, along with evidence for prolonged activity of normal faulting in this and other Tibetan grabens, support models that relate normal faulting to processes occurring beneath the plateau. Thinning of the upper crust is most plausibly the result of potential-energy increases resulting from spatially and temporally heterogeneous changes in thermal structure and density distribution within the crust and upper mantle beneath Tibet. This is supported by recent geophysical and geological data10,11,12,13,14,15,16,17, which indicate that spatial heterogeneity exists in both the Tibetan crust and lithospheric mantle.

Date: 2001
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/35088045 Abstract (text/html)
Access to the full text of the articles in this series is restricted.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:nature:v:412:y:2001:i:6847:d:10.1038_35088045

Ordering information: This journal article can be ordered from
https://www.nature.com/

DOI: 10.1038/35088045

Access Statistics for this article

Nature is currently edited by Magdalena Skipper

More articles in Nature from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().