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世界地质 2023, 42(4) 636-649 DOI: ISSN: 1004-5589 CN: 22-1111/P

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	富碱岩浆岩
	地球化学
	Li 同位素
	岩石成因
	剑川
	滇西
	本文作者相关文章
	刘俊鹏
	王蝶
	丁志丹
	马飞
	PubMed
	Article by Liu J
	Article by Wang D
	Article by Ding Z
	Article by Ma F

滇西剑川新生代富碱岩浆岩 Li 同位素地球化学特征及其对岩浆源区的制约

刘俊鹏, 王蝶, 丁志丹, 马飞

昆明理工大学国土资源工程学院

摘要：对滇西地区金沙江—红河富碱岩浆岩带内发育的剑川? 玉召块和老君山岩体进行了岩相学? 全岩主量? 微量元素和 Li 同位素组成分析? 结果显示, 3 个岩体都富集轻稀土元素 (LREE) 和大离子亲石元素 (LILE), 亏损 Nb? Ta 和 Ti 等高场强元素 (HFSE), 具有弱 Eu 元素异常? 上述 3 个岩体的 δ 7Li 值分别为 0. 70‰ ~ 6. 48‰? 0. 50‰ ~ 5. 89‰? 3. 73‰ ~ 4. 28‰? 结合前人的研究结果, 认为玉召块岩体具有埃达克质特征, 来源于增厚下地壳的部分熔融, 在成岩过程中有少量的铁镁质岩浆注入, 并在岩浆上升过程中混染了中上地壳物质, 剑川和老君山岩体则是交代富集岩石圈地幔部分熔融形成的岩浆持续分异产物?

关键词：富碱岩浆岩地球化学 Li 同位素岩石成因剑川滇西

Li isotopic geochemical characteristics of Cenozoic alkali?rich magmatic rocks and constraints on magmatic source region in Jianchuan, western Yunnan

LIU Junpeng, WANG Die, DING Zhidan, MA Fei

School of Land Resource Engineering, Kunming University of Science and Technology

Abstract: The petrography, whole rock major and trace elements and Li isotope compositions of Jianchuan, Yuzhaokuai and Laojunshan plutons of Jinshajiang??Honghe alkali?rich magmatic belt in western Yunnan area have been studied. The results show that the three plutons are enriched in light rare earth (LREE) and large ion litho? phile elements (LILE), depleted in high field strength elements (HFSE) such as Nb, Ta and Ti, being of weak Eu anomalies. The δ 7 Li values of Jianchuan, Yuzhaokuai and Laojunshan plutons are 0. 70‰ - 6. 48‰, 0. 50‰ - 5. 89‰ and 3. 73‰ - 4. 28‰, respectively. Combined with previous research results, it is believed that the Yuzhaokuai intrusive has the characteristics of adakitic rocks, which is derived from the partial melting of the thick? ened lower crust and a minor amount of mafic magma is injected during melting process. Meanwhile, the middle and upper crustal materials are mixed during the upward migration of the melts. The Jianchuan and Laojunshan intrusives are the products of the magma formed by the partial melting of metasomatic enriched lithospheric mantle through continuous differentiation.

Keywords: alkali?rich magmatic rocks geochemistry lithium isotopes petrogenesis Jianchuan western Yun? nan

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