Petrographical and Mineralogical Characteristics of Bengge Alkaline Igneous Complex in Zhongdian, Western Yunnan and Its Geological Significance
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摘要:
滇西北甭哥碱性杂岩体主要由正长岩、正长斑岩、煌斑岩以及角闪岩、闪长岩、煌斑岩等包体岩石组成，经历了复杂的岩浆—流体作用过程。其寄主岩及包体岩相学和矿物学分析表明，杂岩体存在岩浆混合、混染及交代作用特征。岩体不同岩石类型中浅色矿物基本为正长石，个别代表混合及交代作用残留的样品存在斜长石。暗色矿物均显示出富Si、Mg，贫Al及碱质的特征，不同岩石类型的岩浆来源也不同，其中正长岩类与晚三叠世甘孜理塘洋片俯冲作用有关，为壳幔混合来源，而煌斑岩则是新生代印度——欧亚板块碰撞引发的幔源钾质—超钾质岩浆作用产物。两种不同性质的岩浆处于一个封闭体系，并伴随运移和成岩过程发生相应的岩浆混合、混染及交代作用。因此，甭哥碱性杂岩体的成岩作用受制于晚三叠世到新生代以洋壳俯冲为主的岩浆—流体—构造作用的多期叠加过程。
Abstract:Bengge alkaline igneous complex in Zhongdian, Western Yunnan has the variety of rock types, which is production after a complex magma—fluid process. The petrographical and mineralogical analysis of the host rock and its xenolith suggests that the igneous complex has magma mixing and contamination, and metasomatism features. The light-colored minerals in different rock types of Bengge pluton are orthoclase, and individual sample which represent s magma mixing and metasomatism residual has the plagioclase. The dark minerals show the characters of rich-Si, Mg, and poor-Al, alkali. The magmatic source of different rock types is different. The production of syenite was related to Ganze-Litang oceanic flat subduction in late Triassic, and its origin was crust-mantle mixing source. While the lamprophyre was the production that the mantle source of potassic-ultrapotassic magmatism was caused by India-Eurasia plate collision in Cenozoic. The two magmas with different properties coexisted in the same closed system, and magma mixing, contamination, metasomatism had occurred in the magma transfer and petrogenetic process. Therefore, the petrogenesis of Bengge alkaline igneous complex subjects to the multi-stages overlying process of magma-fluid-tectonism which is mainly oceanic crust subduction.
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表 1 甭哥碱性杂岩体寄主岩及包体黑云母代表性电子探针分析结果/%
Table 1. Representative EPMA results for biotite in host-rocks and xenoliths of Bengge alkaline igneous complex
样品号 05b1#3 05b1#4 04b2#2 08b2 #1 08b2 #2 01-a#2 04-a #1 04-a #2 04-a #5 04-a #6 04-b #1 04-b #2 04-b #3 04-b #4 岩石名称 煌斑岩 角闪石岩 黑云变粒岩 正长斑岩 SiO2 38.01 36.19 34.74 35.80 36.17 34.47 35.02 34.99 36.59 35.80 35.82 33.90 35.42 34.64 TiO2 1.51 1.91 4.43 4.27 4.29 2.50 4.68 4.35 3.87 3.93 4.79 4.60 4.87 5.04 Al2O3 12.48 12.57 12.38 12.41 12.48 14.34 12.39 12.61 12.12 12.61 11.94 12.44 11.76 12.09 FeO 12.06 12.69 17.42 16.04 16.52 19.25 23.27 22.48 22.44 22.35 22.04 22.94 21.21 21.37 MnO 0.12 0.04 0.21 0.06 0.08 0.45 0.23 0.14 0.16 0.18 0.16 0.16 0.14 0.12 MgO 18.02 17.46 12.39 14.00 13.71 12.11 8.97 8.64 9.63 9.13 8.86 8.42 9.98 10.19 CaO 0.07 0.05 0.01 0.06 0.03 0.12 0.02 0.03 0.04 0.11 0.13 0.12 0.03 0.03 Na2O 0.19 0.08 0.02 0.07 0.08 0.03 0.04 0.03 0.00 0.03 0.16 0.05 0.05 0.04 K2O 9.07 8.99 8.74 8.51 9.18 7.63 9.25 9.06 9.25 9.38 8.60 8.58 8.60 8.72 Total 91.52 89.97 90.34 91.22 92.56 90.89 93.86 92.33 94.09 93.52 92.48 91.21 92.05 92.25 阳离子数（以11个氧原子为基础） Si 2.91 2.84 2.79 2.82 2.82 2.76 2.79 2.82 2.88 2.85 2.87 2.78 2.84 2.78 AlⅣ 1.09 1.16 1.17 1.15 1.15 1.24 1.16 1.18 1.12 1.15 1.13 1.20 1.11 1.14 AlⅥ 0.04 0.01 0.00 0.00 0.00 0.11 0.00 0.02 0.01 0.03 0.00 0.00 0.00 0.00 Ti 0.09 0.11 0.27 0.25 0.25 0.15 0.28 0.26 0.23 0.23 0.29 0.28 0.29 0.30 Fe3+ 0.11 0.08 0.20 0.21 0.18 0.19 0.18 0.22 0.21 0.19 0.27 0.21 0.24 0.21 Fe2+ 0.67 0.75 0.97 0.84 0.90 1.10 1.37 1.30 1.27 1.29 1.21 1.36 1.18 1.23 Mn 0.01 0.00 0.01 0.00 0.01 0.03 0.02 0.01 0.01 0.01 0.01 0.01 0.01 0.01 Mg 2.06 2.04 1.48 1.64 1.59 1.44 1.07 1.04 1.13 1.08 1.06 1.03 1.19 1.22 Ca 0.01 0.00 0.00 0.01 0.00 0.01 0.00 0.00 0.00 0.01 0.01 0.01 0.00 0.00 Na 0.03 0.01 0.00 0.01 0.01 0.01 0.01 0.00 0.00 0.01 0.02 0.01 0.01 0.01 K 0.89 0.90 0.90 0.85 0.91 0.78 0.94 0.93 0.93 0.95 0.88 0.90 0.88 0.89 
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表 2 甭哥碱性杂岩体及包体长石代表性电子探针分析结果/%
Table 2. Representative EPMA results for feldspar in host-rocks and xenoliths of Bengge alkaline igneous complex
样品号 BG-03#4 06B2-a #4 06B2-b #1 06B2-b #2 06B2-b #3 06B2-b #4 BG-S #1 08B2 #3 08B2 #4 04-a #4 ZDBG#1 ZDBG#2 岩石名称 正长斑岩 钾长石脉 煌斑岩 黑云变粒岩 蚀变钠长岩 SiO2 63.08 64.00 63.49 63.67 63.56 63.37 63.67 63.44 63.44 63.45 66.27 62.38 TiO2 0.02 0.02 0.02 0.02 0.01 0.00 0.01 0.03 0.03 0.01 Al2O3 17.89 17.80 17.84 17.84 17.68 17.87 17.47 17.49 18.07 18.11 19.83 18.57 FeO 0.13 0.19 0.59 0.51 0.26 0.15 0.92 0.72 0.45 0.12 MnO 0.00 0.00 0.01 0.00 0.00 0.02 0.02 0.00 0.00 0.03 MgO 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 CaO 0.23 0.01 0.00 0.01 0.03 0.01 0.01 0.01 0.03 0.02 0.04 0.02 Na2O 0.19 0.17 1.71 1.65 0.23 0.18 0.48 0.85 1.73 0.25 11.47 4.82 K2O 15.59 15.43 13.36 13.55 15.26 15.51 15.14 14.50 13.00 15.26 0.11 9.37 Total 97.13 97.62 97.02 97.24 97.01 97.11 97.71 97.04 96.75 97.24 97.71 95.16 阳离子数（以22个氧原子为基础） Si 3.00 3.02 3.01 3.01 3.02 3.01 3.03 3.02 3.01 3.01 2.96 2.97 Al 1.00 0.99 1.00 0.99 0.99 1.00 0.98 0.98 1.01 1.01 1.05 1.04 Ca 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Na 0.02 0.02 0.16 0.15 0.02 0.02 0.04 0.08 0.16 0.02 0.99 0.44 K 0.95 0.93 0.81 0.82 0.92 0.94 0.92 0.88 0.79 0.92 0.01 0.57 An 1.19 0.05 0.00 0.05 0.13 0.07 0.03 0.07 0.18 0.11 0.21 0.09 Ab 1.75 1.63 16.28 15.59 2.20 1.70 4.55 8.13 16.80 2.38 99.19 43.85 Or 97.06 98.33 83.72 84.37 97.67 98.23 95.42 91.80 83.03 97.51 0.60 56.07
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表 3 甭哥碱性杂岩体煌斑岩角闪石电子探针分析结果/%
Table 3. EPMA results for amphibole in lamprophyre of Bengge alkaline igneous complex
样品编号 04B2-1 #1 04B2-1 #2 07B1-b #3 07B1-c #4 07B1-d #4 岩石名称 黑云角闪正煌岩 角闪黑云正煌岩 SiO2 55.19 53.06 50.66 53.85 50.86 TiO2 0.19 0.14 0.40 0.16 0.40 Al2O3 1.03 0.82 3.62 1.31 3.14 FeO 9.90 9.54 14.79 12.42 13.68 MnO 0.20 0.30 0.22 0.22 0.27 MgO 17.78 18.18 13.94 16.10 14.76 CaO 11.55 11.61 12.06 11.63 11.56 Na2O 0.77 0.84 0.53 1.46 0.91 K2O 0.19 0.23 0.25 0.18 0.27 Total 96.80 94.73 96.46 97.34 95.85 阳离子数（计算数据以 23 个氧原子和 16 个阳离子为基准） Si 7.90 7.80 7.51 7.80 7.55 AlⅣ 0.10 0.14 0.49 0.20 0.45 AlⅥ 0.07 0.00 0.14 0.02 0.10 Ti 0.02 0.02 0.04 0.02 0.05 Fe3+ 0.88 0.74 0.77 0.71 0.71 Fe2+ 0.30 0.43 1.07 0.80 0.99 Mn 0.02 0.04 0.03 0.03 0.03 Mg 3.79 3.98 3.08 3.48 3.27 Ca 1.77 1.83 1.91 1.80 1.84 Na 0.21 0.24 0.15 0.41 0.26 K 0.04 0.04 0.05 0.03 0.05
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表 4 甭哥碱性杂岩体辉石代表性电子探针分析结果/%
Table 4. Representative EPMA results for pyroxene in Bengge alkaline igneous complex
样品号 05B1 #1 05B1 #2 02-b #1 02-b #2 02-b #3 02-b #4 04-b #5 04-b #6 04-b #7 04-b #8 岩石名称 煌斑岩 正长斑岩 正长斑岩 SiO2 52.70 51.08 51.59 52.92 51.46 51.61 50.84 51.33 53.91 52.42 TiO2 0.24 0.18 0.37 0.26 0.32 0.21 0.28 0.27 0.16 0.25 Al2O3 0.67 0.86 1.13 0.63 1.18 0.68 1.19 1.19 0.48 0.84 Cr2O3 0.01 0.00 0.02 0.12 0.04 0.05 0.01 0.02 0.43 0.01 FeO 7.66 9.51 9.56 6.89 9.55 9.09 8.08 8.07 2.91 8.41 MnO 0.24 0.42 0.35 0.27 0.31 0.42 0.26 0.31 0.03 0.44 MgO 14.76 12.26 12.99 14.70 12.58 13.27 14.21 14.63 17.97 13.93 CaO 22.17 22.56 22.26 23.18 22.56 22.86 22.13 22.36 22.23 22.81 Na2O 0.35 0.47 0.42 0.25 0.42 0.44 0.23 0.38 0.18 0.49 K2O 0.00 0.01 0.00 0.00 0.01 0.00 0.02 0.01 0.00 0.01 Total 98.80 97.35 98.69 99.22 98.43 98.63 97.23 98.57 98.31 99.59 阳离子数（以6个氧原子为基础） Si 1.98 1.98 1.96 1.98 1.97 1.97 1.95 1.94 1.99 1.97 Al(ⅳ) 0.02 0.02 0.04 0.02 0.03 0.01 0.05 0.01 0.01 0.03 Al(ⅵ) 0.01 0.01 0.01 0.01 0.02 0.00 0.01 0.00 0.01 0.01 Ti 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.00 0.01 Cr 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 Fe3+ 0.03 0.05 0.05 0.02 0.04 0.08 0.07 0.10 0.00 0.07 Fe2+ 0.21 0.25 0.25 0.19 0.26 0.21 0.19 0.15 0.09 0.19 Mn 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.00 0.01 Mg 0.83 0.71 0.74 0.82 0.72 0.75 0.81 0.83 0.99 0.78 Ca 0.89 0.93 0.91 0.93 0.92 0.93 0.91 0.91 0.88 0.92 Na 0.03 0.04 0.03 0.02 0.03 0.03 0.02 0.03 0.01 0.04 K 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Wo 44.80 46.81 45.61 46.67 46.52 46.18 45.36 44.81 44.59 45.67 En 41.49 35.40 37.03 41.18 36.09 37.30 40.52 40.80 50.15 38.81 Fs 12.44 16.02 15.80 11.24 15.82 14.91 13.27 13.01 4.61 13.76 Ac 1.27 1.76 1.56 0.91 1.57 1.61 0.86 1.39 0.66 1.76
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