The Source and Origin of Cenozoic Dacites in Lianghe-Luxi Area, Western Yunnan Province： Geochemical Evidence
详细信息
- 责任者：Gao Yongjuan (Chengdu Center of China Geological Survey ; Chengdu 610081 ; China) ; Lin Shiliang
- 刊名：Geological Bulletin of China
- 出版年：2012
- 卷期：31(5)
- 关键词：英安岩 ; dacites ; 云南 ; Yunnan Province
- 页码：p.726-731
- 图表：2 illus., 2 tables, 22 refs.
- 分类号：0801
- issnNo：ISSN1671-2552
- isbnNo：CN11-4648/P
摘要
Major elements, trace elements, REE and Nd isotopic geochemistry of the Cenozoic dacites from Lianghe-Luxi area, western Yunnan Province, were studied in this paper, and the results show that the dacites are enriched in light REE, large-ion lithophile elements and Pb and depleted in Nb, Ta, Sr, P, Ti and heavy REE, with negative Eu anomaly and positive Pb anomaly. These rocks have εNd（0） values from-10.3 to-8.72 and Nd isotopic model ages（tDM） from1.2 to 1.4Ga. It is suggested that the Lianghe-Luxi Cenozoic dacites were derived dominantly by partial melting of crystalline basement rock mixed in different degrees with melts of coeval mantle-derived basaltic magma.
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