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- W2364758536 abstract "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± 0.8Ma)of gabbro-diorite enclaves,and this provides evidence for the mixing magmatic origin.Zircons from quartz diorite yieldeHf(t)values of-7.61to-3.80.Combined with gabbro-diorite enclaves,granite eHf(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." @default.
- W2364758536 created "2016-06-24" @default.
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- W2364758536 date "2012-01-01" @default.
- W2364758536 modified "2023-09-24" @default.
- W2364758536 title "U-Pb Dating and Hf Isotopic Compositions of Quartz Diorite and Monzonitic Granite from the Tengchong-Lianghe Block,Western Yunnan, and Its Geological Implications" @default.
- W2364758536 hasPublicationYear "2012" @default.
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