Abstract
A suite of alkali-rich porphyry with 26. 5–37. 6Ma occur along the Jinsha River suture zone in west Yunnan. They are characterized by LREE-rich distribution patterns and no Eu anomaly. These porphyries have formed in post-collisional environment; (87Sr/8bSr) of porphyries, amphibolite xenolithes and associated basalts are 0.707 3, 0.706 5-0.707 l and0.705 8-0.706 5, ENd(T) are -3.4-6.3, -2.1-7.4 and -3.3 respectively. Pb isotope compositions of these rocks also show a little difference. The evidence shows that the porphyry could be derived from partial melting of the “crust-mantle mixed layer”. The relation between Cenozoic magmatism and intraplate deformation since Paleogene has been discussed.
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Zhang Yuquan, Xie Yinwen, Tu Guangzhi, Preliminary studies of the alkali-rich intrusive rocks in the Ailaoshan-Jinshajiang belt and their bearing on rift tectonics,Acta Petrologica Sinica (in Chinese), 1987, (1):17.
Zhang Yuquan, Xie Yinwen, Tu Guangchi et al.,Geochrmistry of Grunitoid Rocks in Hengduan Mountains Region (in Chinese), Beijing:Science Press, 1995, 1–186.
Bureau of Geology and Mineral Resources of Yunnan Province,Regional Geology of' Yunnan Province (in Chinese), Beijing:Geological Publishing House, 1990, 1–728.
Zartman, R. E., Doe, B. R., Plumetectonics-the model,Tectonophyics., 1981, 75:135.
Russell, R. D., Farquhar, R. M.,Lead Isotope.s in Geology, New York:Interscience, 1960.
Huang Xuan, Sun Shihua, DePaolo, D. J. et al. Nd-Sr isotope study of Cretaceous magmatic rocks from Fujian Province,Ada Petrologica Sinica (in Chinese), 1993, 2(2):50.
Hart S. R., A large-scale isotope anomaly in the southern Hemisphere mantle,Nature, 1984, 309:753.
Zhou Xinhua, Zhu Bingquan, Study on the isotopic system and mantle chemical zonation of Cenozoic basalt in Eastern China, inThe Age and Geochemistry of Cenozoic Volcanic Rocks in China (in Chinese) (ed. Liu Ruoxin), Beijing:Seismological Press, 1992, 366–391.
Xiao Xuchang, Li Tindong, Li Guangcen et al.,Tectonic Evolution of the Lithosphere of the Himalayas (in Chinese), Beijing:Geological Publishing House, 1988, 141–159.
Gao Mingxiu, Kan Rongiue, Zhen Jiangdong et al., 1,ithosphere structure and Himalaya movement in Western Yunnan, China, inArrnuul Report:Laborutory of Lithospherr Tectonic Evolution, Institute of Geology, Academia Sinica (1989-1990) (in Chinese), Beijing:Science & Technology Press, 1991, 49–53.
Mo Xuanxue, Lu Fengxiang, Shen Shangyue et al..Sanjiang Tethyan Volccnism and Related Mineralization (in Chinese), Heijing:Geological Publishing House, 1993. 1–267.
Zhang Liansheng, Zhong Dalai, The Red River strike-slip shear zone and Cenozoic tectonics of east Asia continent,Scientiu Geologica Siirica (in Chinese), 1996, 31(4):327.
Sun Jie, Xu Changfang, Jiang Zhan et al., The etectrical structure of the crust and upper mantle in the west part of Yunnan Province and its relation to crustal tectonics,Seismology and Geology (in Chinese), 1989, 1:35.
Wang Jian, Xu Qing, Zhang Wenren, Heat flow data and some geologic-geothermal problems in Yunnan Province,Seismology and Geology (in Chinese), 1990, 12(4):367.
Zhao Yonggui, Zhong Dalai, Liu Jianhua et al., Research on the Lower lithosphere of the Western Yunnan orogene, inAnnuul Report:Luhorutory of Lithosphere Tectonic Evolution, 1nstitute of Geology, Academia Sinica (1989-1990) (in Chinese), Beijing:Science & Technology Press, 1991, 42–46.
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Project supported by the Nat~onal Natural Science Foundation of China (Grant Nos. 49472102 and 49232030).
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Wanming, D., Xuan, H. & Dalai, Z. Alkali-rich porphyry and its relation with intraplate deformation of north part of Jinsha River belt in western Yunnan, China. Sci. China Ser. D-Earth Sci. 41, 297–305 (1998). https://doi.org/10.1007/BF02973119
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DOI: https://doi.org/10.1007/BF02973119