The petrochemistry and geochemistry of rich-alkali granite porphyry in Western Yunnan

Xiangzhao Hu; Xiangbin Wu; Xinchang Luo

doi:10.1007/BF02652061

Journal of Central South University ›› 1996, Vol. 3 ›› Issue (1) : 61 -63. DOI: 10.1007/BF02652061

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The petrochemistry and geochemistry of rich-alkali granite porphyry in Western Yunnan

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Abstract

The characteristics of the chemical composition of the rich-alkali granite porphyries are poor in SiO₂, with mean content of 69.19%, but rich in alkali and high in potash. The mean content of (K₂O+Na₂O) is 9.85%. K₂O is much greater than Na₂O, mean value of K₂O/Na₂O is 2.10. As shown by the REE analysis, REE contents is lower. Compared with the granite of south China, the rich-alkali granite porphyry hase higher LREE, and no anomaly of europium (δEu=0.87). Its genetic type belongs to A type graritoid.

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prophyry / peotrochemistry / geochemistry / Dianxi

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Xiangzhao Hu, Xiangbin Wu, Xinchang Luo. The petrochemistry and geochemistry of rich-alkali granite porphyry in Western Yunnan. Journal of Central South University, 1996, 3(1): 61-63 DOI:10.1007/BF02652061

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References

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[1]	Tu Guangzhi. On the alkali-rich intrusive rocks. Mineral Resources and Geology (in Chinese), 1989, (3):1–4

[2]	Zhang Yuquan. Preliminary studies of the alkali-rich intrusive rocks in the Ailaoshan-Jinshanliang belt. Acta Petrologica Sinica (in Chinese), 1987, (1):17–22