The Origin of Mafic Enclaves in Xiangjia Granitic Pluton of East Kunlun Orogenic Belt: Evidence from Petrography and Geochemistry
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摘要: 东昆仑造山带以广泛发育富含镁铁质包体的早-中三叠世花岗岩为主要特征，但目前尚缺乏对不同类型镁铁质包体系统的岩相学和矿物学研究.在本文中，我们选择了极具代表性的香加花岗岩体及其中包体为研究对象，从岩相学和矿物化学角度揭示了东昆仑地区壳幔岩浆相互作用的详细过程.研究表明包体发育眼球状石英、韵律环带斜长石和针状磷灰石等不平衡结构和快速结晶现象，指示存在岩浆混合作用，而似辉绿辉长结构包体代表了岩浆混合的基性端元.此外，长石的多阶段生长证明可能存在多次的岩浆混合过程.镁铁质包体相对寄主岩（Mg#值为0.39~0.56，Fe#值为0.44~0.62）具高Mg#和低Fe#特征.包体具有两类角闪石：一类结晶源自早期深部幔源岩浆（TiO2=2.1%~2.9%，SiO2=41.75%~44.49%），另一类则起源于浅部壳幔混合作用（TiO2=1.0%~1.8%，SiO2=42.49%~48.10%）.部分黑云母具有高镁特征（MgO=9.78%~11.53%，Mg#=0.462~0.541），与幔源成因黑云母成分相当.斜长石的韵律环带及化学组成指示其岩浆混合成因.幔源基性岩浆在5×108 bar（约18 km）左右深度结晶并形成高钛角闪石，玄武质岩浆底侵上升，并发生壳幔岩浆混合作用，混合的岩浆上升至2.5×108 bar（约8 km）左右深度结晶形成低钛角闪石.以上证据指示，东昆仑地区在三叠纪时期可能经历了多期次的岩浆混合作用，地幔岩浆的注入在地壳深熔作用和地壳生长过程中扮演了重要角色.广泛的壳幔岩浆相互作用可能是三叠纪时期阿尼玛卿洋板片断离的重要响应.Abstract: The East Kunlun orogenic belt is characterized by widespread Early-Middle Triassic Epoch granitic rocks with a large proportion of mafic enclaves therein, however, there is still lack of petrography and mineralogy studies on the Mafic enclaves with different textures. In this paper, a systematic petrography and mineral chemistry study has been carried out for the representative Xiangjia granite pluton as well as the enclosed Mafic enclaves, which have clarified the processes of crust-mantle interaction in East Kunlun area. Studies on petrography have shown that the mafic enclaves have some disequilibrium textures and some phenomenon point to rapid crystallization, such as needle-like apatite, needle-like amphibole and augen-shaped quartz, all of which suggest the possible of magma mixing process, and the enclave with ophitic-gabbro texture likely to be the basic end-member. In addition, multi-stage growing of feldspar indicates there might be multi-mixing process. Whole rock geochemistry shows that the mafic enclaves have lower Mg# and higher Fe# values relative to their host rocks (Mg#:0.39-0.56, Fe#:0.44-0.62). Electron microprobe investigation shows that enclaves have two kinds of amphiboles, one kind in mafic enclaves (TiO2:2.1%-2.9%, SiO2:41.75%-44.49%) crystallized from mantle-derived basic magma in the early stage, while the other kind (TiO2:1.0%-1.8%, SiO2:42.49%-48.10%) probably crystallized from the mixed magma in the shallow crust level. Some biotites (MgO:9.78%-11.53%, Mg#:0.462-0.541) are similar to biotites crystallizing in the mantle-derived magma. The rhythmic zoning and geochemistry contents of Plagioclases show that they may have suffered the process of magma mixing. Calculated results by geobarameter indicate that the mantle-derived basic magma crystallized under 5×108 bar, i.e. about 18 km depth, producing the high-Ti amphiboles, and then mixed with the acid magma. The mixed magma emplaced to upper crust, maybe at 2.5×108 bar, i.e. about 8km depth, producing the Low-Ti amphiboles. All these features above show that the East Kunlun orogenic belt might have experienced crust-mantle interaction repeatly during the Triassic Epoch, and the injection of mantle magma played an important role in the crustal growth and crust anatexis. The wide crust-mantle interaction may be the response to the slab break-off of Animaqing Ocean during the Triassic Period.
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Key words:
- East Kunlun orogenic belt /
- mafic enclaves /
- granite /
- geochemistry /
- multi-mixing
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图 1 东昆仑大地构造框架简图(a)和昆北断裂带南缘香加岩体地质简图(b)
1.富含包体似斑状二长花岗岩；2.花岗闪长岩；3.二长花岗岩；4.第四系；5.三叠纪；6.水沟；7.采样点；8.工作区域
Fig. 1. Geotectonic framework of East Kunlun (a), and geological sketch of Xiangjia pluton in the south side of East Kunlun belt (b)
图 2 野外相片显示包体与寄主岩之间的相互关系
a.包体多呈浑圆椭球状，长轴定向，说明形成过程中遭受应力作用；b.包体边界呈弯曲状，暗色矿物平行包体边界，说明寄主岩石与镁铁质岩浆为塑性状态下混合形成；c.次棱角状包体；d.包体与寄主岩边界呈迷雾状过渡关系，说明岩浆混合向均匀方向发展；e.介于寄主岩石与包体间的长石巨晶，说明包体中长石是从寄主岩中进入的；f.眼球状石英，说明石英是镁铁质岩浆注入长英质岩浆后，两者一起搅拌形成的
Fig. 2. Field photographs showing mutual geological relationships between the enclaves and their host granite
图 3 寄主岩及各类包体显微照片
a.斜长石韵律环带，说明动荡的结晶环境，正交5倍；b.钾长石增生边结构，包裹有早期暗色矿物，正交5倍；c.长石多层次包裹暗色矿物，说明长石的多阶段生长，单偏5倍；d.眼球状石英，单偏5倍；e.眼球状石英，镶边的暗色矿物均为中粗角闪石，单偏5倍；f.针状磷灰石，指示淬冷过火结晶，单偏20倍；g.针状角闪石, 指示淬冷过火结晶；h.长石中包裹有高Ti角闪石，角闪石具褐-绿多色性，单偏5倍；i.角闪石围绕黑云母生长，单偏5倍；j.黑云母解理弯曲，说明遭受应力作用，单偏5倍；k.黑云母环带结构，正交5倍；l.石英波状消光，说明遭受应力作用，正交10倍
Fig. 3. The microphotos of enclaves and their host granite
图 4 包体和寄主岩的TAS图解(a)和A/CNK-A/NK图解(b)
Fig. 4. Diagrams of TAS (a) and A/CNK vs. A/NK (b) for enclaves and their host granites
图 5 香加岩体及镁铁质包体主量元素哈克图解
在图 5中，笔者发现除K2O以外，寄主岩的Al2O3、CaO、MgO、P2O5、TiO2、FeO含量均与SiO2含量呈很好的负相关性，反映了岩浆的正常演化趋势，而包体中的Al2O3、CaO、TiO2、K2O与SiO2均没有呈现良好的相关性，与Debon(1991)的岩浆混合结论吻合
Fig. 5. Harker diagrams of major elements for mafic enclaves and their host granites
图 7 镁铁质包体及其寄主岩的FeO-MgO协变
据Didier and Barbarin(1991)；虚线箭头代表两种岩浆的混合趋势；实线箭头代表混合前镁铁质岩浆的分异趋势；FeO*为全铁
Fig. 7. Covariant diagram for FeO-MgO of mafic enclaves and their host rocks
图 8 香加岩体角闪石分类图解
据Leake et al.(1997)；M=Mg/(Mg+Fe2+)；Si单位为apfu(O=23)
Fig. 8. Classification of the Hornblende in the Xiangjia pluton
图 9 钙质角闪石Si(a.p.f.u., O=23)-Ti(%)图解
Ⅰ.火山岩中的火成角闪石；Ⅱ.基性超基性岩中的火成角闪石；Ⅲ.变质岩中角闪石；Ⅳ.中酸性侵入岩中的火成角闪石；Ⅴ.退变的或交代成因的角闪石，据马昌前等(1994)
Fig. 9. Si(a.p.f.u., O=23)-Ti(%) diagram of Ca-amphiboles
图 11 低钛角闪石围绕高钛角闪石生长(a)及角闪石环带(b)
Fig. 11. Low-Ti amphibole grows around High-Ti amphibole (a) and Amphibole zoning (b)
图 12 云母Mg-(AlⅥ+Fe3++Ti)-(Fe2++Mn)分类
A.金云母；B.镁质黑云母；C.铁质黑云母；D.铁叶云母；E.铁白云母；F.白云母；原图据Foster(1960)
Fig. 12. Mg-(AlⅥ+Fe3++Ti)-(Fe2++Mn) Classification of micas
图 14 黑云母构造环境判别图解
A.非造山的碱性岩系；C.造山带的钙碱性岩系；P.过铝质岩系；据Abdel-Rahman(1994)
Fig. 14. Discrimination diagram of tectonic settings for biotite
图 15 寄主岩和镁铁质包体中长石的分类
Fig. 15. Classification of feldspars in the mafic enclaves and host rocks
图 16 长石环带从中心至边缘An值变化图解
Fig. 16. An value of feldspar zoning varies from the core to the margin
图 17 镁铁质包体近似辉绿辉长结构(a)及斜长石中心蚀变(b)
Fig. 17. Mafic enclave with ophitic-gabbro texture (a) and Centre alteration of the Pl (b)
图 18 黑云母Ti-Mg/(Mg+Fe)温度图解
Fig. 18. Ti-Mg/(Mg+Fe) geothermometry diagram of biotite
图 19 镁铁质包体与寄主岩成因模式
Fig. 19. Schematic model for explaining the origin of mafic enclaves and their host rock
表 1 香加岩体寄主岩与包体的岩相学特征
Table 1. The petrographic characteristics of Xiangjia host granites and enclaves
样品号 岩石类型主要结构 野外颜色 主要矿物成分 副矿物组合 56-1 寄主岩/似斑状结构 灰白色、浅肉红色 碱性长石+斜长石+角闪石+黑云母+石英；基质中粗粒花岗结构，为条纹长石、微斜条纹长石；斑晶主要为钾长石：占30%，极度绢云母化，粒径一般为0.8 cm×1.2 cm，大者可以达到1.2 cm×2.5 cm，手标本上即可看到暗色矿物镶边；基质主要为斜长石30%，粒径多为1 mm，半自形-他形，发育聚片双晶，环带结构常见；石英多呈集合体状，波状消光不明显，粒径1~3 mm，含量不超过20%，呈他形充填于其他矿物中间.黑云母：片状、自形短柱状，多色性褐-深褐色，生长于斜长石的间隙或者跨越斜长石边界，粒径一般＜1 mm，见简单双晶，含量约5%；角闪石：长柱状，多色性浅绿-墨绿，含量极少2%~3%，粒径一般为0.6 mm；绢云母：呈放射状，由长石蚀变而成，含量为2%. 磷灰石+锆石 56-10 混染带包体/不等粒结构 灰白色 长石斑晶已极度绢云母化，常见增生边结构，且包裹有柱状角闪石，见暗色矿物镶边；基质中常见比暗色矿物粒度还小的斜长石简单双晶，暗色矿物含量5%~10%，分为大小截然的两类，均以角闪石为主；角闪石：短柱状，发育简单双晶，见菱形截面，两组解理夹角呈56°，可见绿色(浅部)角闪石围绕深褐色(深部)角闪石生长一圈，含量2%~3%，晶形良好的角闪石环带发育，且具简单双晶；石英：呈他形充填在自形矿物中间，见石英波状消光. 磷灰石+锆石 56-5 闪长质包体/近辉绿辉长结构 暗黑色 基本不含矿物斑晶，主要矿物：碱性长石+角闪石；偶见石英大斑晶被暗色矿物环绕，经镜下观察，不含辉石和黑云母；碱性长石：自形柱状，两组近90°解理明显，风化严重，极度绢云化，其中含针状磷灰石；角闪石：针柱状，半自形状，菱形截面解理清晰，绿帘石化，绿泥石化，长柱状3~10 mm不等，长宽比为20:1~3:1，半自形1 mm左右. 针状磷灰石+锆石+磁铁矿 
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表 2 香加花岗质岩体及包体主量元素组成(%)
Table 2. Major elements compositions (%) of enclaves and their host granites from Xiangjia
样品号 0009-1 0346-1 0588-1 2085-1 09NM56-1 09NM56-5 09NM56-7 09NM56-10 岩石
类型似斑状二
长花岗岩似斑状二
长花岗岩似斑状二
长花岗岩似斑状二
长花岗岩似斑状二
长花岗岩镁铁质
包体镁铁质
包体镁铁质
包体SiO2 72.95 69.73 68.95 74.01 69.48 53.8 55.64 59.95 TiO2 0.28 0.37 0.48 0.21 0.44 0.72 1.05 0.76 Al2O3 13.57 14.43 14.38 13.10 14.78 15.79 18.2 17.24 FeO 1.63 2.53 2.12 1.10 1.85 5.95 4.80 3.85 Fe2O3 0.77 0.91 1.07 0.62 1.14 2.11 1.92 1.47 MnO 0.06 0.06 0.06 0.03 0.06 0.26 0.15 0.13 MgO 0.75 0.92 1.47 0.38 1.31 5.52 3.27 2.81 CaO 1.94 2.71 3.21 1.20 3.13 6.29 5.27 5.67 Na2O 3.21 3.41 3.45 3.12 3.53 4.27 4.26 3.88 K2O 3.97 3.25 3.32 5.19 3.09 2.34 2.97 2.11 P2O5 0.08 0.09 0.14 0.04 0.12 0.33 0.32 0.23 LOI 0.60 1.04 0.44 0.68 H2O+ 0.46 1.29 1.10 0.71 0.78 1.70 1.73 1.45 CO2 0.13 0.09 0.09 0.11 0.06 0.68 0.13 0.17 Total 99.80 99.79 99.84 99.82 99.77 99.76 99.71 99.72 K2O+Na2O 7.18 6.66 6.77 8.31 6.62 6.61 7.23 5.99 FeO* 2.02 2.99 2.66 1.41 2.42 7.01 5.76 4.59 R1 2 718 2 570 2 492 2 556 2 559 1 283 1 290 1 958 R2 511 619 698 404 690 1 257 1 083 1 084 A/CNK 1.04 1.03 0.95 1.01 1.00 0.75 0.92 0.91 A/NK 1.42 1.58 1.55 1.22 1.62 1.65 1.78 1.99 Mg# 45.06 39.33 55.28 38.11 55.79 62.32 54.84 56.54 Fe# 0.55 0.61 0.45 0.62 0.44 0.38 0.45 0.43 FeO*/MgO 2.69 3.24 1.81 3.71 1.85 1.27 1.76 1.63 注：空格代表缺少相关数据；其中0009-1、0346-1、0588-1、2085-1号样品数据殷鸿福等(2003)；FeO*表示全铁含量；Mg#=MgO/(MgO+FeO*)；Fe#=FeO*/(MgO+FeO*).
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表 3 香加岩体中角闪石电子探针分析(%)及晶体化学式计算结果
Table 3. Electronic probe analysis and crystal chemical formula of Hornblend in Xiangjia Rock (%)
样品 包体56-5 包体56-10 包体56-10 包体56-4 包体56-8 寄主岩56-1 探针点号 5 6 7 8 37 38 40 41 42 43 44 45 46 47 48 63 64 78 79 80 81 82 83 84 96 97 98 SiO2 47.03 47.38 48.10 47.17 47.12 47.07 47.02 42.30 41.84 41.75 41.99 45.40 42.19 44.49 44.17 42.49 43.04 44.91 47.22 46.70 44.68 46.54 44.92 48.52 45.66 45.61 44.38 TiO2 1.26 1.16 1.13 1.23 1.13 1.25 1.22 2.10 2.68 2.73 2.72 1.28 2.90 2.77 2.69 1.79 1.64 1.55 1.22 1.27 1.36 1.40 1.31 1.00 1.49 1.44 1.46 Al2O3 8.24 7.61 7.16 7.55 7.76 8.01 7.43 9.70 9.98 10.25 9.86 7.46 10.09 10.14 9.62 9.79 9.04 8.92 7.01 7.36 7.64 7.69 7.50 5.82 8.46 8.34 8.00 FeO* 16.16 16.23 15.92 16.63 16.80 16.98 16.77 19.88 19.54 19.30 19.44 18.08 17.39 15.00 16.46 20.63 19.87 18.52 17.34 17.37 18.13 16.88 18.49 16.69 17.46 17.30 18.41 MnO 0.56 0.63 0.53 0.54 0.54 0.56 0.51 0.55 0.56 0.53 0.49 0.54 0.38 0.37 0.53 0.57 0.60 0.57 0.57 0.62 0.52 0.51 0.61 0.72 0.59 0.51 0.52 MgO 11.65 11.89 12.15 11.45 11.58 11.26 11.76 9.57 9.46 9.28 9.43 11.27 10.67 11.78 10.73 9.25 9.93 10.18 11.74 11.39 11.57 11.67 11.26 12.37 10.84 11.19 11.29 CaO 11.07 11.01 11.29 11.38 11.16 10.96 11.40 11.49 11.31 11.51 11.59 11.78 11.30 10.88 11.21 11.64 11.68 11.20 11.34 11.39 11.71 11.25 11.68 11.27 11.18 11.40 11.89 Na2O 1.47 1.49 1.25 1.33 1.27 1.32 1.27 1.80 1.83 1.87 1.79 1.35 2.00 1.91 1.71 1.59 1.48 1.45 1.17 1.32 1.47 1.48 1.47 1.06 1.44 1.51 1.56 K2O 0.70 0.62 0.65 0.75 0.70 0.75 0.77 0.96 0.96 0.92 0.93 0.71 0.92 0.92 0.94 1.21 1.04 0.94 0.71 0.70 0.80 0.81 0.73 0.58 0.95 0.91 0.81 Cr2O3 0 0 0 0 0 0 0 0 0 0.04 0 0 0 0 0 0 0 0 0.01 0 0.01 0 0 0 0 0 0 Total 98.15 98.02 98.18 98.03 98.05 98.15 98.14 98.35 98.17 98.17 98.22 97.87 97.84 98.26 98.05 98.96 98.3 98.24 98.33 98.11 97.89 98.23 97.99 98.05 98.07 98.21 98.31 Si 6.87 6.92 7.01 6.94 6.89 6.88 6.89 6.34 6.29 6.29 6.32 6.74 6.3 6.5 6.54 6.36 6.44 6.65 6.91 6.87 6.63 6.83 6.67 7.08 6.74 6.73 6.59 Ti 0.14 0.13 0.12 0.14 0.12 0.14 0.13 0.24 0.3 0.31 0.31 0.14 0.33 0.30 0.30 0.20 0.18 0.17 0.13 0.14 0.15 0.15 0.15 0.11 0.17 0.16 0.16 Al 1.42 1.31 1.23 1.31 1.34 1.38 1.28 1.72 1.77 1.82 1.75 1.31 1.78 1.75 1.68 1.73 1.59 1.56 1.21 1.28 1.34 1.33 1.31 1.00 1.47 1.45 1.40 Fe* 1.98 1.98 1.94 2.04 2.05 2.08 2.06 2.49 2.45 2.43 2.45 2.25 2.17 1.83 2.04 2.58 2.49 2.30 2.12 2.14 2.25 2.07 2.30 2.04 2.16 2.13 2.29 Fe3+ 0.57 0.62 0.51 0.44 0.64 0.63 0.57 0.72 0.70 0.55 0.56 0.65 0.60 0.52 0.4 0.74 0.78 0.64 0.69 0.6 0.79 0.59 0.77 0.7 0.58 0.56 0.72 Fe2+ 1.41 1.36 1.43 1.60 1.41 1.44 1.48 1.77 1.76 1.88 1.88 1.60 1.57 1.31 1.64 1.84 1.71 1.66 1.43 1.53 1.46 1.48 1.53 1.34 1.58 1.57 1.57 Mn 0.07 0.08 0.07 0.07 0.07 0.07 0.06 0.07 0.07 0.07 0.06 0.07 0.05 0.05 0.07 0.07 0.08 0.07 0.07 0.08 0.07 0.06 0.08 0.09 0.07 0.06 0.07 Mg 2.54 2.59 2.64 2.51 2.52 2.45 2.57 2.14 2.12 2.08 2.12 2.50 2.38 2.57 2.37 2.06 2.21 2.25 2.56 2.5 2.56 2.55 2.49 2.69 2.39 2.46 2.5 Ca 1.73 1.72 1.76 1.79 1.75 1.72 1.79 1.85 1.82 1.86 1.87 1.87 1.81 1.70 1.78 1.87 1.87 1.78 1.78 1.79 1.86 1.77 1.86 1.76 1.77 1.80 1.89 Na 0.41 0.42 0.35 0.38 0.36 0.37 0.36 0.52 0.53 0.55 0.52 0.39 0.58 0.54 0.49 0.46 0.43 0.42 0.33 0.38 0.42 0.42 0.42 0.3 0.41 0.43 0.45 K 0.13 0.11 0.12 0.14 0.13 0.14 0.14 0.18 0.18 0.18 0.18 0.13 0.18 0.17 0.18 0.23 0.20 0.18 0.13 0.13 0.15 0.15 0.14 0.11 0.18 0.17 0.15 Cr 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Sum-cat 15.28 15.26 15.24 15.31 15.24 15.23 15.3 15.55 15.54 15.58 15.57 15.4 15.56 15.42 15.45 15.56 15.5 15.37 15.24 15.3 15.44 15.34 15.42 15.17 15.36 15.41 15.49 Mg# 0.64 0.66 0.65 0.61 0.64 0.63 0.63 0.55 0.55 0.53 0.53 0.61 0.6 0.66 0.59 0.53 0.56 0.58 0.64 0.62 0.64 0.63 0.62 0.67 0.6 0.61 0.61 M 0.44 0.43 0.42 0.45 0.45 0.46 0.44 0.54 0.54 0.54 0.54 0.47 0.48 0.42 0.46 0.56 0.53 0.51 0.45 0.46 0.47 0.45 0.48 0.43 0.47 0.46 0.48 注：Fe*= Fe3++Fe2+；Mg#=Mg/(Fe2++Mg)；M=Fe*/(Fe*+Mg).
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表 4 高Ti与低Ti角闪石特征对比
Table 4. Feature comparison of high-Ti and low-Ti amphiboles
角闪石类型 高Ti 低Ti 多色性 褐-黄绿 绿-淡黄 位置 核部 边部 成分 SiO2含量较低；AlⅣ含量较高 SiO2含量较高；AlⅣ含量较低 形态 他形-半自形 半自形-自形 包裹物 仅有少量磁铁矿，锆石包裹体 有黑云母、锆石、磷灰石等包裹体 形成环境 高温高压，氧逸度较高 高温高压，氧逸度较低 形成源区 幔源 壳幔混合
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表 5 香加岩体中黑云母主量元素(%)及晶体化学式计算结果
Table 5. Major elements (%) and crystal chemical formula of biotites in Xiangjia Rock
样品号 包体56-10 包体56-10 包体56-4 寄主岩56-1 产状 包裹于石英颗粒中 自形颗粒 自形颗粒 包裹于长石颗粒中 探针点号 13 14 15 16 17 18 19 20 59 60 61 85 86 87 88 94 95 SiO2 35.97 35.47 35.97 35.46 34.55 35.53 35.71 35.31 36.78 37.89 37.69 37.74 36.53 36.81 36.56 36.03 36.90 TiO2 4.71 4.86 4.89 5.01 4.75 4.65 4.70 4.68 4.11 4.22 3.93 4.33 4.23 4.32 4.30 4.89 4.73 Al2O3 14.23 14.35 14.18 14.22 13.77 14.61 14.03 14.24 13.64 13.96 13.91 13.77 13.84 13.88 13.90 13.82 13.66 FeO* 22.93 23.26 23.13 22.97 23.03 22.98 23.45 23.32 22.35 20.28 20.58 20.25 22.80 22.57 22.62 22.28 20.06 MnO 0.33 0.36 0.34 0.34 0.32 0.37 0.37 0.37 0.34 0.35 0.33 0.44 0.42 0.45 0.40 0.34 0.36 MgO 10.35 10.25 10.11 9.97 9.78 10.28 10.29 10.01 10.96 11.41 11.53 11.42 10.84 11.04 10.93 10.35 10.94 CaO 0 0 0 0.04 0.02 0.05 0 0 0.03 0.02 0.07 0.01 0 0.01 0.01 0 0 Na2O 0.12 0.08 0.11 0.08 0.10 0.16 0.14 0.17 0.12 0.07 0.09 0.10 0.17 0.10 0.09 0.12 0.18 K2O 9.02 8.97 8.92 8.61 8.79 8.66 8.96 8.87 9.4 9.33 8.80 9.18 9.29 9.23 9.33 9.18 8.98 FeO 20.03 20.41 20.1 19.86 20.29 20.03 20.66 20.53 19.69 17.25 17.49 17.21 20.17 19.79 19.94 19.38 17.01 Fe2O3 3.22 3.17 3.37 3.46 3.05 3.27 3.10 3.10 2.95 3.37 3.44 3.38 2.92 3.09 2.98 3.22 3.39 Total 97.66 97.58 97.66 96.69 95.10 97.28 97.64 96.96 97.72 97.54 96.93 97.23 98.11 98.4 98.15 97.02 95.82 SiⅣ 2.71 2.68 2.71 2.69 2.69 2.68 2.70 2.69 2.76 2.81 2.81 2.81 2.74 2.74 2.74 2.73 2.79 AlⅣ 1.26 1.28 1.26 1.27 1.26 1.30 1.25 1.28 1.21 1.19 1.19 1.19 1.22 1.22 1.23 1.23 1.21 TiⅣ 0.03 0.04 0.03 0.04 0.05 0.02 0.05 0.04 0.03 0 0 0 0.04 0.04 0.03 0.04 0 AlⅥ 0 0 0 0 0 0 0 0 0 0.03 0.03 0.01 0 0 0 0 0 TiⅥ 0.24 0.23 0.24 0.24 0.22 0.25 0.22 0.23 0.20 0.24 0.22 0.24 0.20 0.21 0.21 0.24 0.27 Fe2+ 1.26 1.29 1.27 1.26 1.32 1.27 1.31 1.31 1.24 1.07 1.09 1.07 1.27 1.23 1.25 1.23 1.07 Fe3+ 0.18 0.18 0.19 0.2 0.18 0.19 0.18 0.18 0.17 0.19 0.19 0.19 0.16 0.17 0.17 0.18 0.19 Mn2+ 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.03 0.03 0.03 0.03 0.02 0.02 Mg 1.16 1.15 1.13 1.13 1.13 1.16 1.16 1.14 1.23 1.26 1.28 1.27 1.21 1.23 1.22 1.17 1.23 Na 0.02 0.01 0.02 0.01 0.01 0.02 0.02 0.02 0.02 0.01 0.01 0.01 0.02 0.01 0.01 0.02 0.03 K 0.87 0.86 0.86 0.83 0.87 0.83 0.86 0.86 0.90 0.88 0.84 0.87 0.89 0.88 0.89 0.89 0.87 TOTAL 7.75 7.75 7.73 7.71 7.76 7.74 7.76 7.76 7.78 7.70 7.69 7.70 7.78 7.76 7.77 7.74 7.69 Mg# 0.48 0.47 0.47 0.47 0.46 0.48 0.47 0.46 0.50 0.54 0.54 0.54 0.49 0.50 0.49 0.49 0.53 注：表中列出的黑云母的主量元素电子探针分析结果；黑云母的Fe2+和Fe3+值采用林文蔚和彭丽君(1994)的计算方法获得，并以22个氧原子为单位计算黑云母的阳离子数及相关原子数；FeO*代表全铁.
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表 6 香加岩体中长石电子探针主量元素(%)和晶体参数分析
Table 6. Major elements (%) and crystal chemical formula of feldspar in Xiangjia rock
样品号 包体56-10 包体56-6 包体56-5 寄主岩56-1 点号 27 28 31 32 33 34 54 55 56 57 58 9 10 11 12 99 100 SiO2 57.58 57.98 60.25 60.41 61.17 62.62 59.02 59.95 44.84 58.68 60.58 61.55 63.65 60.51 60.24 60.81 60.63 TiO2 0.02 0.03 0.03 0.04 0.03 0.03 0.05 0.04 0.05 0.02 0 0.03 0.04 0.01 0.05 0.02 0 Al2O3 26.87 26.15 25.16 25.03 24.43 23.35 25.43 25.38 23.25 25.99 24.89 24.04 22.44 24.54 24.96 24.42 24.39 FeO 0.1 0.1 0.15 0.14 0.16 0.1 0.14 0.15 0.48 0.08 0.09 0.13 0.24 0.11 0.11 0.16 0.14 MnO 0 0 0 0 0 0 0 0 0.01 0 0 0.00 0.00 0.00 0.00 0 0 MgO 0.01 0.03 0.02 0.01 0.01 0.03 0.03 0.04 0.18 0.02 0.01 0.04 0.03 0.02 0.03 0.01 0.02 CaO 9.15 8.54 7.13 7.04 6.37 5.35 7.99 7.52 23.76 8.27 6.92 6.20 4.60 6.85 7.04 6.52 6.37 Na2O 5.92 6.31 7.08 6.87 7.43 8.08 6.42 6.63 0.25 6.37 7.09 7.53 8.58 7.11 7.00 7.5 7.42 K2O 0.23 0.27 0.27 0.28 0.35 0.32 0.28 0.28 0.61 0.19 0.25 0.34 0.34 0.30 0.31 0.28 0.32 Cr2O3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Total 99.87 99.42 100.09 99.82 99.94 99.88 99.37 99.99 93.42 99.62 99.84 99.86 99.92 99.44 99.72 99.7 99.31 Ab 53 56 63 63 66 72 58 60 2 58 64 67 76 64 63 66 67 An 45 42 35 36 31 26 40 38 95 41 35 31 22 34 35 32 31.56 Or 1 2 2 2 2 2 2 2 3 1 1 2 2 2 2 2 2
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