First identification of Mid-Miocene north–south trending dikes in the eastern Qiangtang terrane, eastern Tibet: Mantle melting and implications for plateau uplift

• Published in: Lithos 2024-08, Vol.478-479, p.107620, Article 107620
• Main Authors: Xu, Chuan-Bing, Wang, Jun, Wang, Qiang, Kerr, Andrew C., Li, Wu-Fu, Liu, Jin-Heng, Wang, Bing-Zhang, Li, Shan-Ping, Wang, Chun-Tao, Wang, Zi-Long, Gong, Lin
• Format: Article
• Language: English
• Subjects: East–west extension; Miocene; North–south trending dikes; Qiangtang; Tibetan Plateau
• ISSN: 0024-4937; 1872-6143
• DOI: 10.1016/j.lithos.2024.107620

The uplift of the Tibetan Plateau during the Miocene is crucial to understanding continental deformation processes and global climatic events. However, the eastern Tibetan Plateau remains poorly investigated. Mantle-derived magmatism provides crucial insights into the deep dynamic processes and surface uplift of the plateau. In this paper we report the first discovery of north–south trending lamprophyre dikes from the Aduo Basin in the eastern Qiangtang terrane, eastern Tibet. Our new age data show that these lamprophyre dikes were generated in Mid-Miocene (15–13 Ma). This new discovery has bridged the Mid-Miocene mantle-derived magmatic gap in the Qiangtang terrane. Trace element and Nd–Sr isotopic data indicate that they were derived by partial melting of enriched subcontinental lithospheric mantle. Our study implies that the eastern Tibetan Plateau had its attained near-maximum elevation by the Mid-Miocene. Combined with previous research results, we propose that the entire plateau almost simultaneously reached its near-maximum elevation by the Mid-Miocene. •The first discovery of Aduo lamprophyres has bridged the Mid-Miocene magmatic gap in the Qiangtang terrane.•The Aduo lamprophyres were derived from partial melting of enriched subcontinental lithospheric mantle.•The north–south trending dikes indicate that the eastern Tibet had its attained near-maximum elevation by the Mid-Miocene