• 责任者：Li Zaihui (Chengdu Institute of Geology and Mineral Resources ; Chengdu 610081 ; China) ; Lin Shiliang
• 刊名：Acta Geologica Sinica
• 出版年：2012
• 卷期：86(7)
• 关键词：石英闪长岩 ; quartz diorite ; 二长花岗岩 ; monzogranite ; 同位素年龄 ; isotope age ; 云南 ; Yunnan Province
• 页码：p.1047-1062
• 图表：illus., 4 tables, 96 refs.
• 分类号：0801
• issnNo：ISSN0001-5717
• isbnNo：CN11-1951/P

The Tengcong-Lianghe magmatic belt is the eastward extension of the Gangdese granite belt. Gabbro-diorite enclaves, granite, and quartz diorites in the Tengcong-Lianghe area have close spatial and temporal relationship. Morphological, structural, textural and mineralogical characteristics of gabbro-diorite enclaves indicate that these enclaves were the products of rapid condensation and crystallization of the intermediate and mafic magmas. Geochemical data show that the gabbro-diorite enclaves are calc-alkaline series,  characterized by low SiO2, high MgO and Mg#, enrichment in the Rb, Sr, Th, Ba and Ce, depletion in Nb, Ta, P, Zr, Yb and Y. Host granites belong to medium to high-K calc-alkaline series, metaluminous weak peraluminous, and are enriched Rb, Th, Zr and Hf, depleted in Nb, Ta, Ti, Sr, P and Ba, with medium Eu negative anomaly. The quartz diorites lie between the gabbro-diorite enclaves and host granites. Zircon LA-ICP-MS dating indicates that the quartz diorites and monzonitic granites were emplaced at 127. 10±0. 96Ma and 123. 8±2. 5Ma, respectively, coeval with emplacement age（122.6± 0.8 Ma）of gabbro-diorite enclaves, and this provides evidence for the mixing magmatic origin. Zircons from quartz diorite yield ε_Hf（t）values of-7.61to-3.80. Combined with gabbro-diorite enclaves, granite ε_Hf（t）and their geochemical features, it is concluded that granite may be derived from partial melting of ancient crust, gabbor-diorite enclaves from partial melting of mantle-wedge peridotite, and quartz diorite from the mixing of mantle-derived magma and partial melting crust. Early Cretaceous intrusive rocks in the Tengchong-Lianghe block may be related to southward subduction of the Bangonghu-Nuiang oceanic lithosphere.