Pliocene-Quaternary crustal melting in central and northern Tibet and insights into crustal flow
MetadataShow full item record
There is considerable controversy over the nature of geophysically recognized low-velocity-high-conductivity zones (LV-HCZs) within the Tibetan crust, and their role in models for the development of the Tibetan Plateau. Here we report petrological and geochemical data on magmas erupted 4.7-0.3 Myr ago in central and northern Tibet, demonstrating that they were generated by partial melting of crustal rocks at temperatures of 700-1,050 degrees C and pressures of 0.5-1.5 GPa. Thus Pliocene-Quaternary melting of crustal rocks occurred at depths of 15-50 km in areas where the LV-HCZs have been recognized. This provides new petrological evidence that the LV-HCZs are sources of partial melt. It is inferred that crustal melting played a key role in triggering crustal weakening and outward crustal flow in the expansion of the Tibetan Plateau.
Wang , Q , Hawkesworth , C J , Wyman , D , Chung , S-L , Wu , F-Y , Li , X-H , Li , Z-X , Gou , G-N , Zhang , X-Z , Tang , G-J , Dan , W , Ma , L & Dong , Y-H 2016 , ' Pliocene-Quaternary crustal melting in central and northern Tibet and insights into crustal flow ' Nature Communications , vol 7 , 11888 . DOI: 10.1038/ncomms11888
This is an Open Access article which is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
DescriptionFinancial support for this research was provided by the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (grant no. XDB03010600), the National Natural Science Foundation of China (nos. 41025006 and 41421062), talent project of Guangdong Province (2014TX01Z079), GIGCAS 135 project 135TP201601, and the scientific and technical innovation intersection and cooperation team program of Chinese Academy of Sciences.
Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.