Geochronology, geochemistry and tectonic evolution of the basaltic trachyandesite in Huize, northeastern Yunnan Province
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摘要:
滇东北会泽地区发现峨眉山玄武岩中沿NNE向发育的玄武粗安岩，通过详细的野外地质调查、镜下岩相学分析、锆石U-Pb定年以及岩石地球化学测试等方法，研究了该玄武粗安岩形成年龄，地球化学特征及其指示的构造演化过程。LA-ICP-MS锆石U-Pb年代学确定玄武粗安岩形成的加权年龄为（251.6±4.2）Ma（MSWD=0.20），蚀变年龄分别为（143.5±1.9）Ma和（150.5±2.4）Ma。岩石地球化学主量、稀土和微量元素测试表明，玄武粗安岩的SiO2含量在52.09%~54.10%，属于中基性火山岩；Mg#介于19.88~40.86，在TAS图解上整体显示为碱性玄武岩粗安岩系列；稀土元素和微量元素特征显示出会泽玄武粗安岩来自交代的富集地幔源区，岩浆演化过程中发生了一定的单斜辉石、斜长石和磁铁矿的分离结晶作用。会泽玄武粗安岩是峨眉山玄武岩的一部分，推断其为峨眉山地幔柱活动消亡期的产物。
Abstract:Several small-scale basalt trachyandesite rock masses were found in NNE direction in Emeishan basalts of Huize area, northeastern Yunnan Province. Based on detailed field geological survey, microscopic petrographic analysis, zircon U-Pb dating and rock geochemical test, the authors studied the formation age and geochemical characteristics of these basalt trachyandesites and their tectonic evolution process. LA-ICP-MS zircon U-Pb dating yielded a weighted mean 206Pb/238U age of(251.6±4.2)Ma (MSWD=0.20) for the basalt trachyandesite, and the alteration ages are(143.5±1.9) Ma and(150.5±2.4) Ma, respectively. The content of SiO2 in basalt trachyandesite is between 52.09%-54.10%, implying that it belongs to the intermediate basic volcanic rock. The Mg# values of basalt trachyandesite are from 19.88 to 40.86, and the TAS diagram generally shows that it belongs to alkali basalt trachyandesite series. The characteristics of REE and trace elements show that the basalt trachyandesite of Huize was derived from enriched mantle source. In the process of magmatic evolution, a part of clinopyroxene, plagioclase and magnetite experienced fractional crystallization. It is considered that the basalt trachyandesite of Huize is a part of Emeishan basalts, and that it might have been the product of the extinction of Emeishan mantle plume.
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图 5 玄武粗安岩SiO2-(Na2O+K2O)图解（a, 底图据Lebas et al., 1986）及玄武粗安岩SiO2-K2O图解（b, 底图据Hastie et al., 2007）
Figure 5.
图 6 玄武粗安岩球粒陨石标准化稀土元素配分（a）及原始地幔标准化微量元素蛛网（b）（标准值据Winchester and Floyd, 1977）
Figure 6.
图 8 玄武粗安岩（La/Sm）-（Sm/Yb）图解（底图据Mahoney et al., 1997）
Figure 8.
表 1 滇东北会泽玄武粗安岩（D6211）锆石U-Pb定年分析结果
Table 1. U–Pb dating results of zircon U-Pb from the Huize basalt trachyandesite (D6211) in northeast Yunnan
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表 2 会泽玄武粗安岩样品主量元素（%）和微量元素（10-6）分析结果
Table 2. Major elements (%) and trace elements (10-6) analytical results of Huize basaltic trachyandesite samples
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表 3 研究区玄武岩和OIB端元及各主要化学储库不相容元素比值
Table 3. Basalt and OIB end elements and incompatible element ratios in major chemical reservoirs in the study area
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