Genesis and geological implications of the Neoproterozoic A-type granite from the Lugu area, western Yangtze block
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摘要:
前人对扬子地块西缘新元古代I型和S型花岗岩开展了深入的研究工作，但有关A型花岗岩的研究则鲜有报道，其岩石成因及大地构造意义仍存较大争议。文章选择最新发现的泸沽A型花岗岩体为研究对象，开展系统的LA-ICP-MS锆石U-Pb年代学、岩石学和地球化学研究，探讨其成因机制和地质意义。泸沽花岗岩由钾长花岗岩和二长花岗岩组成，LA-ICP-MS锆石U-Pb年代学分析显示其结晶年龄分别为（806±5）Ma和（815±5）Ma，属新元古代岩浆活动产物。岩石具有高硅（SiO2=71.2%~76.1%）、高碱（K2O+Na2O=6.73%~8.95%）、高K2O/Na2O比值（1.89~3.60）和强过铝质（A/CNK=1.07~1.49）的特征。[FeOT/（FeOT+MgO）]-SiO2和[（Na2O+K2O）-CaO]-SiO2图解均指示泸沽花岗岩为铁质碱钙性A型花岗岩。泸沽花岗岩具有较高的稀土元素含量（∑REE=221×10-6~387×10-6），具有轻稀土富集而重稀土亏损的特征（（La/Yb）N=3.42~9.69），具有明显Eu的负异常（δEu=0.10~0.34）。泸沽花岗岩具有较高的Zr、Nb、Ce和Y含量，具有较高的Ga/Al、Y/Nb、Yb/Ta和Ce/Nb比值，显示出典型的A2型花岗岩特征。综合元素地球化学及区域地质资料，文章提出泸沽新元古代铝质A2型花岗岩起源于新元古代早期俯冲造山过程中的变泥质岩熔融。
Abstract:Previous studies have deeply examined the Neoproterozoic I-type and S-type granites on the western margin of the Yangtze Plate, whereas very insufficient attention has been paid to A-type granites, and hence their petrogenetic nature and tectonic implications are still controversial. In this paper, the authors report the results of a detailed study of the newly discovered Lugu Atype granites in the Yangtze Plate, using LA-ICP-MS zircon U-Pb geochronology, petrology, and whole-rock geochemistry, with emphasis placed on the petrogenesis and tectonic setting of the A-type granites. The Lugu granitoid consists of alkali feldspar granite and monzonitic granite that yielded zircon U-Pb ages of (806±5) Ma and (815±5) Ma by LA-ICP-MS, respectively. The Lugu granitoid is deduced as the Neoproterozoic magmatic product. The Lugu granitoid is characterized by high SiO2 (71.2%-76.1%), high total alkali values (K2O + Na2O values from 6.73% to 8.95%), high K2O/Na2O ratios (1.89-3.60) and peraluminous features (A/CNK=1.07-1.49). Both[FeOT/(FeOT+MgO)] versus SiO2 and[(Na2O+K2O)-CaO] versus SiO2 plots indicate ferroan and alkali-calcic signatures typical of A-type granitoids. The content of rare earth elements of alkali feldspar granite and monzonitic granite is high (∑REE=221×10-6-387×10-6), and both rocks show enrichment of LREE rather than HREE with a right-inclined REE patterns for (La/Yb)N ratios from 3.42 to 9.69. Both type rocks have obvious negative Eu anomaly (δEu=0.10-0.34). Meanwhile, the Lugu granitoid has relative high content of Zr, Nb, Ce and Y with high ratios of Ga/Al, Y/Nb, Yb/Ta and Ce/Nb, showing that it is a typical A2-type granite. Combined with the data on geochemistry and regional geology, the authors hold that the Lugu Neoproterozoic A2-type granite was derived from the partial melting of pelitic rock in early Neoproterozoic subduction orogeny.
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Key words:
- Neoproterozoic /
- Yangtze block /
- A-type granite /
- magma origin /
- subduction orogeny
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图 1 扬子地块西缘地质简图 (a, 据Huang et al., 2008）修改）和研究区地质简图（b）
Figure 1.
图 6 稀土元素球粒陨石标准化图和（b）微量元素原始地幔标准化图（标准化值据文献（Taylor and Mclennan, 1985; Sun and Mcdonough, 1989））
Figure 6.
图 7 花岗岩的成因类型判别图解（底图据Whalen et al., 1987）
Figure 7.
图 8 泸沽钾长花岗岩和二长花岗岩的源岩判别图解（底图据Alther and siebel, 2002和Kaygusuz et al., 2008）
Figure 8.
图 9 泸沽花岗岩的Al2O3/TiO2-CaO/Na2O (a) 及Rb/Sr-Rb/Ba (b) 源区判别图解（据Sylvester et al., 1998）
Figure 9.
表 1 泸沽钾长花岗岩及二长花岗岩LA-ICP-MS锆石U-Pb同位素测定结果
Table 1. LA-ICP-MS zircon U-Pb isotopic analyses of alkali feldspar granite and monzonitic granite in Lugu area
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表 2 泸沽钾长花岗岩及二长花岗岩主量 (%) 及微量含量 (10-6) 分析结果
Table 2. Major (%) and trace elements (10-6) composition of alkali feldspar granite and monzonitic granite in the Lugu area
下载: 导出CSV
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