Petrogenesis of Mafic Microgranular Enclaves: Evidence from Petrography, Whole-Rock and Mineral Chemistry of Ziyunshan Pluton, Central Hunan
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摘要: 暗色微粒包体广泛分布于湘中紫云山岩体中的似斑状角闪石黑云母花岗闪长岩中,但其研究程度较低.对具有火成结构的暗色微粒包体及其寄主岩进行了岩相学、全岩及长石、辉石、黑云母的矿物地球化学研究,探讨其岩石成因及构造意义.寄主岩的全岩主量、微粒元素较为均一,而暗色微粒包体变化较大,且后者相对贫SiO2而富Na2O,但总体上二者均具有准铝质、钙碱性、镁质的特征,均富集轻稀土和大离子亲石元素,而亏损重稀土和高场强元素.寄主岩和暗色微粒包体的斜长石、辉石和黑云母均分别属于中长石、次透辉石-低铁次透辉石和铁质黑云母的范畴,显示相似的矿物地球化学特征.详尽的岩相学和地球化学特征表明,寄主岩属于I型和ACG型花岗岩,具有明显壳幔混合的特点;而暗色微粒包体形成时处于液态并具有流动性,与寄主岩间存在明显的机械和化学混合作用,并具有早期为骤冷快速结晶、晚期缓慢结晶这两期过程.因此,紫云山岩体中出现大量暗色微粒包体,是印支晚期湘中地区在强烈挤压之后的松弛阶段,由于软流圈物质上涌,并与其诱发的壳源酸性岩浆混合作用的产物.Abstract: The porphyraceous hornblende biotite granodiorite is generated in the Ziyunshan pluton, Central Hunan Province, which hosts many mafic microgranular enclaves (MMEs). This paper presents petrography, major and trace elements of whole-rock, and mineral chemistry of feldspar, pyroxene, as well as biotite of the igneous-texture mafic microgranular enclaves and host rocks, their genetic mechanism and geotectonic significance were investigated. The whole-rock geochemistry of host rocks is more stable than those of mafic microgranular enclaves, and the latter were characterized by relatively depleted SiO2 and enriched Na2O. Both of them are represented by metaluminous, calc-alkaline and magnesian, and enrichment of LREE and LILE and depletion of HREE and HFSE. The plagioclase, pyroxene and biotite of host rocks and mafic microgranular enclaves belong to andesine, ferrosalite-salite and ferribiotite, respectively, showing similar characteristics of mineral chemistry. According to a comprehensive analysis of petrographical characteristics and geochemical data, it is suggested that (1) the host rock belongs to I-type and ACG-type granite, showing the characteristics of crust-mantle mixing; (2) the mafic microgranular enclaves were formed in liquid state, having liquidity and featuring both mechanical and chemical interactions with host rocks; (3) the crystallization of the mafic microgranular enclaves can be classified into two stages: the initial one is undercooling and rapid crystallization stage, and the latter is slow crystallization stage. To sum up, the mafic microgranular enclaves in the Ziyunshan pluton were generated by mixing of mafic magmas (sub-alkaline tholeiite which formed from mantle) and its induced crustal felsic magma (products of partial melting of arenaceous rock in crust) in the relaxation period after the compressive stress period in the late Indo-Chinese epoch.
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Key words:
- Ziyunshan pluton /
- mafic microgranular enclave /
- mineral /
- geochemistry /
- magma mixing /
- pyroxene /
- igneous rock
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图 1 湖南紫云山岩体区域综合地质简图
1.中新生界;2.上古生界;3.下古生界;4.元古界;5.花岗岩体;6.断层;7.黑(二)云母二长花岗岩;8.似斑状含角闪石黑云母二长花岗岩;9.似斑状角闪石黑云母花岗闪长岩;10.透辉石(角闪石)富黑云母二长花岗岩;11.采样位置;12.断层.图a修改自刘凯等(2014)
Fig. 1. Simplified geological maps of the Ziyunshan pluton in Hunan
图 3 寄主岩与暗色微粒包体镜下照片
a,b.寄主岩中具聚片双晶的斜长石和有明显熔蚀现象的黑云母;c,d.暗色微粒包体中粒度较大的石英包嵌多种粒度较小辉石、黑云母等暗色矿物和针状-短柱状的磷灰石;e.石英斑晶被辉石等暗色矿物环绕,构成齿冠结构;f.暗色微粒包体中由辉石为主的暗色矿物组成的暗色矿物团块.图a、e、f左边为单偏光,右边为正交偏光,图b为单偏光,图c、d为正交偏光.矿物缩写:Qtz.石英;Pl.斜长石;Bt.黑云母;Kfs.钾长石;Cpx.单斜辉石;Ap.磷灰石;Di.透辉石
Fig. 3. Thin sections photographs of host rocks and mafic microgranular enclaves
图 4 寄主岩与暗色微粒包的A/KNC-A/NC图解(a),SiO2-MALI图解(b),SiO2-Fe*图解(c)和花岗岩类TAS分类图解(d)
图a底图据Maniar and Piccoli(1989);图b和图c底图据Frost et al.(2001);图d底图据Middlemost(1994)
Fig. 4. The A/KNC-A/NC diagram (a), SiO2-MALI diagram(b), SiO2-Fe* diagram (c) and TAS diagram (d) of host rocks and mafic microgranular enclaves
图 6 寄主岩与暗色微粒包体的稀土元素球粒陨石标准化配分模式(a, b)及微量元素原始地幔标准化图解(c, d)
球粒陨石和原始地幔标准化值据Sun and McDonough(1989)
Fig. 6. Chondrite-normalized REE patterns (a, b) and primitive mantle-normalized trace element spidergrams (c, d) of their host rocks and mafic microgranular enclaves
图 9 寄主岩(a)和暗色微粒包体(b)的单斜辉石成分分类
Fig. 9. Classification of clinopyroxene from host rocks (a) and mafic microgranular enclaves (b)
图 12 云母分类图(a)和云母的Fe3+-Fe2+-Mg图解(b)
a底图据Foster(1960);b底图据Wones and Eugster(1965)
Fig. 12. Classification of micas (a) and Fe3+-Fe2+-Mg diagram (b)
图 14 寄主岩和暗色微粒包体的CaO/Na2O-Al2O3/TiO2图解(a)和(Na2O+K2O)/(MgO+TFeO+TiO2)-Na2O+K2O+MgO+TFeO+TiO2图解(b)
图a底图据Sylvester(1998);图b底图据Patino Douce(1999)
Fig. 14. CaO/Na2O-Al2O3/TiO2 (a) and (Na2O+K2O)/ (MgO+TFeO+TiO2)-Na2O+K2O+MgO+TFeO+TiO2 (b) diagrams
图 15 MgO-TFeO图(a)和Al2O3/CaO-NaO/CaO图(b)
图a底图据Zorpi et al.(1989)
Fig. 15. Diagrams of MgO-TFeO (a) and Al2O3/CaO-NaO/CaO (b)
表 1 寄主岩体及暗色微粒包体主量(%)、微量元素组成(10-6)
Table 1. Major element (%) and trace element (10-6) compositions of host rocks and mafic microgranular enclaves
样号 寄主岩 暗色微粒包体 H1 H2 H3 H4 B-1-1 B-1-2 B-2 B-3 B-5 B-6 B-7 B-8 B-9 SiO2 66.2 66.4 67.4 67.2 62.0 62.1 61.2 60.8 61.3 57.8 66.5 62.8 62.9 TiO2 0.66 0.61 0.55 0.60 1.20 1.26 1.22 0.79 0.75 1.48 0.56 0.90 1.00 Al2O3 15.10 15.00 15.50 15.30 15.90 15.65 15.75 15.80 15.55 17.75 14.75 15.60 16.10 TFeO 5.11 4.71 4.37 4.69 7.75 7.62 7.60 7.04 6.57 8.19 4.71 6.61 6.90 MnO 0.08 0.07 0.07 0.07 0.10 0.10 0.10 0.15 0.14 0.10 0.09 0.10 0.09 MgO 1.56 1.44 1.28 1.40 2.29 2.23 2.42 2.64 2.61 2.33 1.60 2.05 2.12 CaO 3.17 3.08 3.25 2.88 3.66 3.73 3.87 5.89 5.28 4.37 3.24 2.64 3.77 Na2O 3.12 3.11 3.36 3.01 3.56 3.54 3.63 3.78 3.56 4.21 2.76 2.58 3.87 K2O 4.35 4.28 3.97 4.83 2.96 2.64 2.54 1.96 2.87 2.82 4.97 6.14 2.30 P2O5 0.17 0.16 0.14 0.16 0.26 0.25 0.31 0.17 0.19 0.37 0.14 0.26 0.29 SO3 0.07 0.06 0.03 0.06 0.13 0.09 0.06 0.04 0.05 0.08 0.03 0.02 0.04 NiO <0.01 <0.01 <0.01 <0.01 0.01 <0.01 <0.01 0.01 <0.01 <0.01 <0.01 <0.01 <0.01 CuO <0.01 <0.01 <0.01 <0.01 0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 0.01 <0.01 CoO <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 Cr2O3 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 <0.01 0.02 0.01 0.01 BaO 0.07 0.07 0.06 0.09 0.04 0.03 0.02 0.02 0.05 0.02 0.09 0.07 0.03 LOI 0.32 0.79 0.45 0.42 0.41 0.36 0.68 0.43 0.28 0.35 0.31 0.61 0.48 Total 100.10 99.87 100.55 100.80 100.40 99.71 99.54 99.63 99.32 100.05 99.87 100.50 100.00 Mg# 0.38 0.38 0.37 0.37 0.37 0.37 0.39 0.43 0.44 0.36 0.40 0.38 0.38 V 64 56 54 54 117 119 112 94 112 114 57 102 94 Cr 50 40 40 40 30 30 40 50 50 20 40 50 30 Ga 19.9 19.5 19.0 18.7 23.9 24.2 23.0 20.0 20.2 26.8 17.4 20.6 24.7 Rb 246 233 212 239 279 270 272 205 229 299 251 373 237 Sr 169.0 166.5 171.5 173.5 142.0 135.5 127.5 134.5 128.0 131.0 146.5 147.5 124.5 Y 30.3 28.6 25.9 27.4 48.4 55.7 33.3 28.4 41.4 51.8 23.6 29.5 40.7 Zr 246 235 202 223 242 242 335 153 246 672 175 278 421 Nb 13.9 13.1 11.6 12.4 22.9 22.9 18.8 14.4 15.0 20.7 11.5 14.9 20.1 Sn 7 7 6 5 9 9 5 6 7 6 4 4 6 Cs 21.10 19.05 16.25 12.55 24.60 23.10 24.60 15.40 24.70 20.50 11.30 16.05 18.70 Ba 598 592 530 761 310 298 142 126 446 164 778 568 206 Hf 6.1 5.9 5.2 5.7 5.8 5.8 8.5 3.7 5.9 16.6 4.1 6.9 10.3 Ta 1.4 1.4 1.3 1.4 2.8 3.1 1.2 1.1 1.1 1.3 0.9 1.0 1.6 W 2 4 3 2 1 2 2 2 3 4 1 2 1 Th 27.80 27.30 21.70 23.80 19.45 19.45 25.50 10.95 16.95 34.20 7.93 15.95 32.70 U 6.11 5.77 4.36 4.29 20.40 19.60 8.64 14.55 5.66 14.20 7.01 10.05 3.20 La 49.9 44.8 34.2 39.7 35.4 41.4 63.7 24.4 39.9 96.9 13.8 35.7 65.3 Ce 100.0 89.1 69.3 79.6 73.1 85.8 130.0 48.5 78.6 198.5 27.3 78.8 128.5 Pr 10.60 9.53 7.58 8.85 8.34 9.81 14.35 5.44 8.61 21.20 3.22 8.50 14.45 Nd 37.1 32.8 26.6 31.1 30.8 37.0 51.3 19.9 30.8 73.8 12.8 30.4 50.6 Sm 7.05 6.54 5.46 6.15 7.84 9.27 9.65 5.14 7.51 14.45 3.68 6.74 9.70 Eu 1.22 1.19 1.15 1.21 1.08 1.14 1.00 0.95 0.93 1.29 1.02 1.14 0.95 Gd 6.10 5.91 4.90 5.59 8.07 9.44 8.35 5.11 7.49 12.55 4.17 6.31 8.68 Tb 0.91 0.85 0.74 0.84 1.31 1.64 1.19 0.86 1.19 1.83 0.64 0.98 1.25 Dy 4.95 4.79 4.47 4.59 8.27 9.88 6.64 5.19 7.31 10.15 4.00 5.42 7.04 Ho 1.06 1.02 0.91 0.98 1.71 1.98 1.27 1.05 1.52 1.96 0.86 1.10 1.46 Er 3.18 2.79 2.79 2.75 4.73 5.62 3.29 2.99 4.27 5.30 2.47 3.10 4.02 Tm 0.47 0.44 0.40 0.40 0.67 0.83 0.44 0.41 0.58 0.67 0.32 0.43 0.54 Yb 2.66 2.65 2.45 2.57 4.09 4.66 2.49 2.55 3.72 3.93 2.07 2.40 3.23 Lu 0.48 0.41 0.39 0.39 0.60 0.68 0.38 0.44 0.58 0.60 0.34 0.38 0.53 ΣREE 225.68 202.82 161.34 184.72 186.01 219.15 294.05 122.93 193.01 443.13 76.69 181.40 296.25 LREE 205.87 183.96 144.29 166.61 156.56 184.42 270.00 104.33 166.35 406.14 61.82 161.28 269.50 HREE 19.81 18.86 17.05 18.11 29.45 34.73 24.05 18.60 26.66 36.99 14.87 20.12 26.75 LREE/HREE 10.39 9.75 8.46 9.20 5.32 5.31 11.23 5.61 6.24 10.98 4.16 8.02 10.07 LaN/YbN 13.46 12.13 10.01 11.08 6.21 6.37 18.35 6.86 7.69 17.69 4.78 10.67 14.50 δEu 0.57 0.59 0.68 0.63 0.42 0.37 0.34 0.57 0.38 0.29 0.80 0.53 0.32 δCe 1.07 1.06 1.06 1.04 1.04 1.04 1.05 1.03 1.04 1.07 1.00 1.11 1.03 附表 1 长石化学成分(%)
附表 1. Chemical compositions of plagioclase(%)
样号 寄主岩 暗色微粒包体 1.1-1 1.1-2 1.1-3 1.1-4 1.1-5 1.1-6 1.1-7 1.1-8 1.2-1 1.6-1 1.6-2 1.6-4 1.6-5 1.6-6 7.3 7.4 7.6 6.2 6.7-1 6.7-2 6.7-3 6.7-3 7.1 7.2 SiO2 56.15 55.24 58.36 58.16 59.02 58.99 59.48 61.18 58.47 59.62 56.26 59.08 59.48 60.72 60.79 57.77 56.69 58.40 58.00 58.39 56.49 55.47 57.69 60.93 TiO2 0.04 0.07 0.00 0.02 0.01 0.01 0.00 0.02 0.02 0.02 0.03 0.06 0.02 0.04 0.00 0.00 0.00 0.00 0.05 0.00 0.07 0.03 0.06 0.03 Al2O3 26.89 24.68 27.06 26.58 26.54 25.64 25.54 25.08 25.29 25.33 25.80 24.71 24.86 23.27 24.32 27.92 26.41 26.15 25.24 25.55 24.93 25.94 25.77 25.22 TFeO 0.20 0.07 0.04 0.10 0.05 0.08 0.14 0.14 0.06 0.13 0.14 0.16 0.05 0.09 0.07 0.11 0.10 0.11 0.11 0.04 0.11 0.05 0.05 0.17 MnO 0.02 0.00 0.00 0.00 0.00 0.00 0.04 0.01 0.00 0.00 0.01 0.00 0.04 0.02 0.04 0.04 0.01 0.01 0.00 0.00 0.01 0.00 0.00 0.02 CaO 9.73 7.68 9.07 8.51 8.67 7.81 7.71 7.41 8.22 8.14 7.69 6.48 6.98 5.93 6.50 9.82 8.35 7.69 8.07 7.80 7.33 8.49 7.63 6.82 Na2O 5.79 6.10 6.45 6.58 6.02 5.81 5.73 6.04 6.42 5.08 7.44 7.63 6.89 7.51 6.65 6.28 6.35 6.08 6.85 7.00 7.07 6.22 7.06 7.68 K2O 0.41 0.20 0.23 0.33 0.35 0.36 0.37 0.36 0.42 0.56 0.47 0.44 0.42 0.55 0.35 0.29 0.31 0.19 0.35 0.44 0.55 0.30 0.31 0.25 Total 99.21 94.03 101.21 100.27 100.65 98.70 99.02 100.23 98.90 98.87 97.83 98.54 98.73 98.13 98.71 102.24 98.22 98.62 98.66 99.21 96.56 96.51 98.57 101.12 O=8 Si 2.55 2.62 2.58 2.60 2.62 2.66 2.67 2.71 2.64 2.68 2.59 2.68 2.68 2.75 2.73 2.54 2.59 2.64 2.63 2.63 2.63 2.58 2.62 2.69 Al 1.44 1.38 1.41 1.40 1.39 1.36 1.35 1.31 1.35 1.34 1.40 1.32 1.32 1.24 1.29 1.45 1.42 1.39 1.35 1.36 1.37 1.42 1.38 1.31 Ca 0.47 0.39 0.43 0.41 0.41 0.38 0.37 0.35 0.40 0.39 0.38 0.31 0.34 0.29 0.31 0.46 0.41 0.37 0.39 0.38 0.37 0.42 0.37 0.32 Na 0.51 0.56 0.55 0.57 0.52 0.51 0.50 0.52 0.56 0.44 0.66 0.67 0.60 0.66 0.58 0.54 0.56 0.53 0.60 0.61 0.64 0.56 0.62 0.66 K 0.02 0.01 0.01 0.02 0.02 0.02 0.02 0.02 0.02 0.03 0.03 0.03 0.02 0.03 0.02 0.02 0.02 0.01 0.02 0.03 0.03 0.02 0.02 0.01 An 47.04 40.48 43.17 40.90 43.42 41.67 41.64 39.50 40.42 45.24 35.43 31.15 35.02 29.39 34.28 45.59 41.32 40.65 38.66 37.15 35.28 42.25 36.75 32.45 Ab 50.63 58.25 55.55 57.24 54.53 56.07 55.98 58.23 57.11 51.05 61.99 66.35 62.49 67.36 63.51 52.79 56.84 58.17 59.36 60.36 61.60 56.00 61.48 66.14 Or 2.33 1.27 1.28 1.86 2.06 2.26 2.38 2.28 2.47 3.71 2.58 2.50 2.49 3.25 2.20 1.63 1.84 1.18 1.98 2.49 3.12 1.75 1.77 1.40 注:TFeO为全铁含量(下同). 附表 2 辉石化学成分(%)
附表 2. Chemical compositions of pyroxene (%)
样号 寄主岩 暗色微粒包体 1.4 1.5 1.8-1 1.8-2 7.7 3.1 3.2 3.4 3.4-1 3.4-2 3.4-3 6.4 6.5-1 6.5-2 6.8 7.2 7.5 SiO2 50.99 50.14 50.63 53.13 51.82 49.53 51.42 53.84 40.85 53.26 47.47 51.36 51.06 50.30 49.99 49.84 48.90 TiO2 0.07 0.04 0.11 0.12 0.00 0.07 0.08 0.01 17.69 0.26 0.27 0.10 0.04 0.08 0.07 0.02 0.02 Al2O3 0.60 3.16 1.08 0.84 0.91 6.97 1.51 2.16 1.43 1.66 2.84 0.61 0.76 1.40 0.44 1.02 0.57 TFeO 16.51 14.60 14.83 14.48 14.20 13.49 12.48 10.29 8.73 9.73 11.74 14.28 15.26 13.17 15.75 14.29 16.44 Cr2O3 0.00 0.01 0.03 0.00 0.03 0.01 0.02 0.05 0.04 0.08 0.03 0.05 0.09 0.00 0.01 0.09 0.02 MnO 1.02 0.98 0.89 0.86 0.82 0.73 0.67 0.50 0.31 0.53 0.52 0.90 0.83 0.89 0.84 0.85 1.12 MgO 8.09 8.58 8.90 9.03 8.76 9.79 10.78 10.88 7.00 11.42 11.22 9.87 9.76 9.80 8.32 8.62 8.44 CaO 22.81 22.45 22.10 21.84 22.43 20.42 21.80 21.06 22.38 22.57 20.61 22.73 21.66 21.64 23.07 22.39 21.46 Na2O 0.37 0.35 0.59 0.47 0.32 0.31 0.37 0.85 0.26 0.49 0.54 0.29 0.33 0.37 0.17 0.35 0.39 Total 100.46 100.31 99.15 100.76 99.29 101.31 99.12 99.63 98.69 100.01 95.24 100.19 99.78 97.64 98.66 97.46 97.35 O=6 Si 1.978 1.926 1.972 2.017 2.003 1.855 1.972 2.016 1.601 1.995 1.899 1.975 1.974 1.971 1.973 1.974 1.963 Al(ⅳ) 0.022 0.074 0.028 0.000 0.000 0.145 0.028 0.000 0.522 0.005 0.101 0.025 0.026 0.029 0.002 0.026 0.001 Al(ⅵ) 0.005 0.069 0.022 0.037 0.041 0.163 0.040 0.096 0.000 0.068 0.033 0.002 0.009 0.036 0.000 0.022 0.000 Ti 0.002 0.001 0.003 0.004 0.000 0.002 0.002 0.000 0.522 0.007 0.008 0.003 0.001 0.002 0.002 0.001 0.001 Cr 0.000 0.000 0.001 0.000 0.001 0.000 0.001 0.001 0.001 0.002 0.001 0.002 0.003 0.000 0.000 0.003 0.001 Fe3+ 0.060 0.041 0.065 0.000 0.000 0.000 0.014 0.000 0.000 0.000 0.138 0.056 0.055 0.024 0.064 0.040 0.114 Fe2+ 0.473 0.426 0.415 0.462 0.460 0.423 0.386 0.325 0.297 0.307 0.250 0.401 0.437 0.406 0.453 0.432 0.433 Mn 0.034 0.032 0.029 0.028 0.027 0.023 0.022 0.016 0.010 0.017 0.018 0.029 0.027 0.029 0.028 0.028 0.038 Mg 0.468 0.492 0.517 0.511 0.505 0.547 0.616 0.607 0.409 0.638 0.669 0.566 0.563 0.572 0.490 0.509 0.505 Ca 0.948 0.924 0.922 0.888 0.929 0.820 0.896 0.845 0.940 0.905 0.883 0.936 0.897 0.908 0.975 0.951 0.923 Na 0.028 0.026 0.045 0.034 0.024 0.022 0.027 0.062 0.020 0.036 0.042 0.022 0.025 0.028 0.013 0.027 0.030 Wo 47.16 47.60 46.27 46.20 47.75 44.68 45.68 45.55 56.07 47.60 44.16 46.59 44.79 46.14 48.21 47.85 45.17 En 23.27 25.32 25.92 26.56 25.96 29.80 31.44 32.73 24.40 33.52 33.44 28.14 28.09 29.06 24.19 25.61 24.72 Fs 28.18 25.72 25.57 25.46 25.04 24.30 21.49 18.39 18.33 17.00 20.29 24.20 25.88 23.37 26.94 25.18 28.63 Ac 1.38 1.35 2.24 1.78 1.25 1.21 1.39 3.33 1.20 1.87 2.11 1.08 1.24 1.42 0.65 1.36 1.48 注:Al(ⅳ).四次配位铝;Al(ⅵ).六次配位铝. 附表 3 黑云母化学成分(%)
附表 3. Chemical compositions of biotite (%)
样号 寄主岩 暗色微粒包体 1.3 1.7 1.8 3.3 4.1 6.3 SiO2 34.798 37.204 36.198 36.768 35.134 34.483 TiO2 3.966 4.099 3.686 3.560 3.909 4.166 Al2O3 13.649 13.282 13.158 12.803 12.453 12.887 TFeO 23.188 23.097 22.881 20.370 23.842 22.568 MnO 0.308 0.281 0.334 0.295 0.328 0.291 MgO 8.247 7.916 7.305 9.884 8.059 8.051 CaO 0.087 0.058 0.109 0.071 0.055 0.063 Na2O 0.269 0.274 0.451 0.271 0.339 0.169 K2O 8.887 9.614 9.267 9.158 9.464 9.226 Total 93.400 95.825 93.389 93.181 93.583 91.904 O=11 Si 2.780 5 2.884 6 2.885 8 2.894 6 2.824 7 2.804 4 AlⅣ 1.219 5 1.115 4 1.114 2 1.105 4 1.175 3 1.195 6 AlⅥ 0.065 9 0.098 3 0.122 1 0.082 5 0.004 7 0.039 6 Ti 0.238 4 0.239 1 0.221 1 0.210 8 0.236 4 0.254 9 Fe3+ 0.187 8 0.234 5 0.219 0 0.218 8 0.139 3 0.185 0 Fe2+ 1.361 7 1.263 2 1.306 6 1.122 3 1.463 7 1.350 0 Mn 0.020 8 0.018 5 0.022 6 0.019 7 0.022 3 0.020 0 Mg 0.982 4 0.915 0 0.868 2 1.160 0 0.965 9 0.976 1 Ca 0.007 4 0.004 8 0.009 3 0.006 0 0.004 7 0.005 5 Na 0.041 7 0.041 2 0.069 7 0.041 4 0.052 8 0.026 6 K 0.905 9 0.951 0 0.942 5 0.919 8 0.970 7 0.957 2 Total 7.812 2 7.765 5 7.781 0 7.781 2 7.860 7 7.815 0 -
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