Alkali-rich porphyry and its relation with intraplate deformation of north part of Jinsha River belt in western Yunnan, China |
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Authors: | Deng Wanming Huang Xuan Zhong Dalai |
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Affiliation: | (1) Institute of Geology, Chinese Academy of Sciences, 100029 Kijing, China |
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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. Project supported by the Nat~onal Natural Science Foundation of China (Grant Nos. 49472102 and 49232030). |
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Keywords: | alkali-rich porphyry crust-mantle mixed layer orogene |
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