Abstract
The Nangqen Basin is one of the typical shearing-extensional basins situated in the north part of the Hengduan Mts. Nine ages of the Cenozoic volcanic rocks from the basin by K-Ar isotope-dilution technique have been reported in the note. The apparent ages of whole rock and separated biotite range from 32.04 to 36.50 Ma. The40Ar-K (%) correlation isochronal line shows that there existed neither argon excessing, nor radiogenetic argon loosing, i.e. the age represents the true diagenetic time. Volcanic activity in this area occurred in the post-collision environment and is controlled by lithosphere substantial thickening and violent intercontinental shearing-strike slip faults. There is age difference of the magmatic activity in the east, the west and the north Tibet. The multi-periodic eruption-intrusion of the magmatic melt since Cenozoic is a tracer showing the pulsating uplift of the Tibetan Plateau.
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References
Pan Guitang, Wang Peisheng. Xu Yaorong et al., Cenozoic Tectonic Evolution of Qinghai-Xizang Plateau (in Chinese), Beijing: Geological Publishing House, 1990, 14–31.
Yang Daxiong, Wang Peisheng, The determinations of plateau age by40Ar/39Ar dating on Cenozoic calc-alkalic trachytes of Nangqen Basin, northern transverse mountains, in Contribution to the Geology of the Qinghai-Xizang (Tibet) Plateau (in Chinese with English abstract), Beijing: Geological Publishing House, 1988(19): 14.
Fan Hua, Lu Huiqing, A preliminary analysis of Himalayan volcanic rocks series and its activity in Nangqen district, Yushu County, in Contribution to the Geology of the Qinghai-Xizang (Tibet) Plateau (in Chinese with English abstract), Beijing: Geological Publishing House, 1983(13): 129.
Zang Yuquan, Xie Yinwen, Tu Guangzhi et al., Geochemistry of Granitoid Rocks in Hengduan Mountains Region (in Chinese), Beijing: Science Press, 1995, 30–47.
Deng Wanming, Huang Xuan, Zhong Dalai, Alkali-rich porphyry and its relation with intraplate deformation of north part of the Jinsha River belt in western Yunnan, China, Science in China, Ser. D, 1998, 41(3): 297.
Sun-Lin Chung, Ching-Hua Lo, Tung-Yi Lee et al., Diachronous uplift of the Tibetan Plateau starting 40 Myr ago, Nature, 1998, 394:769.
Deng Wanming, Cenozoic intraplate volcanic rocks in the northern Qinghai-Xizang Plateau (in Chinese with English abstract), Beijing: Geological Publishing House, 1998, 23–26.
Arnaud, N. O., Vidal, Ph., Tapponnier, P. et al., The high-K2O volcanism of northwestern Tibet: Geochemistry and tectonic implications, Earth Planet Science Letter, 1992, 111; 351.
Turner, S., Hawksworth, C. J., Liu, J. Q. et al., Timing of Tibetan uplift constrained by analysis volcanic rocks, Nature, 1993, 364:50.
Turner, S., Arnaud, N., Liu, J. Q. et al., Post-collision, shoshonitic volcanism on the Tibetan Plateau: Implications for connective thinning of the lithosphere and the source of ocean island basalts, J. Petrol., 1996, 37: 45.
Shi Yafeng, Tang Maocang, Ma Yuzhen et al., The relationship between the two-stage uplifting and the formation of the Asian mansoon of the Tibetan Plateau, Science in China (in Chinese), Ser. D, 1998, 28(3): 263.
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Deng, W., Sun, H. & Zhang, Y. K-Ar age of the Cenozoic volcanic rocks in the Nangqen Basin, Qinghai Province and its geological significance. Chin. Sci. Bull. 45, 1015–1019 (2000). https://doi.org/10.1007/BF02884983
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DOI: https://doi.org/10.1007/BF02884983