Mineralogical characteristics of tourmaline in the Jiama copper polymetallic deposit, Tibet: Insights into hydrothermal evolution
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摘要:研究目的
角岩作为甲玛超大型斑岩铜多金属成矿系统的重要组成部分，既是成矿热液的岩性圈闭，也是重要的赋矿围岩，但角岩中的电气石成因不明，对于进一步理解成矿过程有一定制约。
研究方法本文通过详细的钻孔编录、镜下鉴定和电子探针分析，研究电气石的成因，并探讨其对岩浆热液流体演化过程的启示。
研究结果电气石在甲玛角岩中较为发育，依据其产状可分为4类：Tur−I，热液角砾岩胶结物中的电气石；Tur−II，石英+电气石±黄铁矿脉；Tur−III，电气石±黄铁矿±黄铜矿脉；Tur−IV，团斑状电气石±黄铁矿；其中前3类电气石较发育环带结构。不同产状电气石均具有较为宽泛的Al2O3、Fe/(Fe+Mg)和Na/(Na+Ca)比值，属于碱基亚类镁电气石和黑电气石，替代机制为X□Al(NaMg)−1、Fe2+Mg−1和Fe3+Al−1。
结论不同产状电气石发育复杂的环带结构，且成分变化极大，表明其是岩浆热液流体和地层流体不同程度混合造成的，且岩浆热液流体与还原性的角岩地层发生的水岩反应可能在甲玛成矿过程中起了重要作用。甲玛不同产状电气石的结构和成分信息记录了岩浆热液演化过程的细节信息，为完善成矿过程提供了重要证据。
创新点:不同产状电气石的结构和成分信息示踪斑岩成矿系统热液演化过程。
Abstract:This paper is the result of mineral exploration engineering.
ObjectiveHornfels, as an important part of the Jima porphyry copper polymetallic system, is host rocks and a lithologic trap for ore−forming fluid. However, the origin of tourmaline in hornfels is unknown, which restricts the further understanding of the mineralization.
MethodsWe carried out detailed drilling logging, petrographic observations and major element analyses of tourmaline with distinctive occurrences in hornfels from the Jiama deposit to elucidate the genesis of tourmaline and evolution of magmatic hydrothermal fluids.
ResultsFour types of tourmalines in hornfels from the Jiama deposit have been identified in this study: 1) Tur−I, tourmaline occurring as cement in hydrothermal breccias; 2) Tur−II, quartz + tourmaline ± pyrite vein; 3) Tur−III, tourmaline ± pyrite ± chalcopyrite vein; 4) porphyritic tourmaline ± pyrite. Tourmaline with distinctive occurrences in hornfels, which belongs to alkali group and dravite−schorl solid solution series, has a wide range of Al2O3, Fe/(Fe+Mg) and Na/(Na+Ca). X□Al(NaMg)−1, Fe2+Mg−1 and Fe3+Al−1 exchange dominates the substitutions of Tur−I−IV.
ConclusionsTourmaline in hornfels with complicated zoning texture has a very variable compositions, indicating that the tourmaline is caused by different degrees of mixing of magmatic hydrothermal fluid and formation fluid, and the water−rock interaction between magmatic hydrothermal fluid and reduced hornfels may play an important role on the mineralization. The various textures and compositions of tourmaline with distinctive occurrences in hornfels from Jiama record some detailed information related to evolution of magmatic hydrothermal fluid, and can provides evidence for understanding the mineralization.
Highlights:The various textures and compositions of tourmaline trace evolution of magmatic hydrothermal fluid.
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1. 研究目的（Objective）
湘中坳陷作为南方复杂构造区页岩气勘探的热点地区之一，也是中国油气勘探久攻未克的地区。前期在湘中地区北部的涟源凹陷泥盆系和石炭系获得了页岩气突破和发现，证实了湘中地区上古生界页岩气资源丰富。但对湘中地区南部的邵阳凹陷调查程度较为薄弱，针对邵阳凹陷二叠系仅开展了少量基础地质调查工作，页岩气资源潜力评价方面的工作尤为欠缺。本次研究依托邵阳湘邵地1井（XSD1井）钻探工程建立了邵阳凹陷二叠系地层层序序列，揭示了主要含气页岩层系的分布特征，获取了含气性评价参数，对湘中地区二叠系页岩气勘探开发和重新评价湘中坳陷页岩气资源潜力具有重要的现实意义。
2. 研究方法（Methods）
中国地质调查局武汉地质调查中心在收集分析区域地质相关资料的基础上，结合邵阳凹陷短陂桥向斜的煤田浅钻、非震物探等资料开展页岩气地质综合评价，采用页岩埋深500~4500 m，页岩有机碳含量≥1.0%，页岩厚度≥15 m，页岩有机质热演化程度1.0%~3.5%的评价参数在短陂桥向斜区优选页岩气远景区，论证部署了1口小口径页岩气地质调查井—XSD1井，湖南煤田地质勘查有限公司组织实施钻探（图 1a）。该井采样全井段取心钻井工艺，测井选取PSJ-2数字测井系统，录井采用SK-2000G气测录井，钻获二叠系大隆组156.05 m（暗色硅质页岩、钙质泥岩94.48 m），龙潭组349.95 m（暗色泥岩216.93 m，粉砂质泥岩36.9 m），对这两套层系共采集暗色泥岩样品33件，进行解析气含量测定分析，落实了含气性评价参数。
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图 1 湘邵地1井构造位置图（a）、主要含气层段岩性和含气性参数柱状图（b）、以及富集模式图（c）Figure 1. Structural location of Xiangshaodi 1 well (a), lithology and gas-bearing parameters of main gas bearing zones (b), and enrichment mode (c)3. 结果（Results）
本次样品分析工作由武汉地质调查中心古生物与生命-环境协同演化重点实验室完成，采用YSQ-IIIA岩石解析气测定仪（燃烧法）对含气段岩心共计33件样品进行分析。该井钻获二叠系大隆组厚度156.05 m，为一套硅质岩、硅质页岩、炭质钙质泥岩地层。其中在井深842~930.2 m硅质页岩、钙质泥岩段，气测全烃值从1.06%上升至16.54%，甲烷值从1.01%上升至14.04%，13件大隆组硅质页岩现场解析总含气量为1.29~9.97 m3/t，平均4.85 m3/t。实现了湘中坳陷二叠系页岩气新发现，有效拓展了华南地区大隆组勘探范围。
钻获龙潭组厚度349.95 m，上段为一套细砂岩、粉砂岩夹泥岩潮坪相沉积地层，下段为一套炭质泥岩、粉砂质泥岩夹薄层细砂岩泻湖相沉积地层。在井深1013.4~1048 m泥岩与粉砂岩互层段气测全烃值最高可达19.87%，甲烷值最高为16.94%，7件泥岩与粉砂岩样品现场解析总含气量0.57~3.42 m3/t，平均1.78 m3/t；井深1088.10~1199.75 m泥岩夹泥质粉砂岩含气层111.6 m，气测全烃值最高可达28.2%，甲烷值最高为23.6%，13件泥岩、粉砂质泥岩样品现场解析总含气量0.90~4.55 m3/t，平均2.01 m3/t（图 1b），首次查明了湘中坳陷二叠系龙潭组非常规油气分布特点。
通过区域地质背景分析，并结合煤田区域地质资料，本研究认为滑脱断裂（F9）上下盘具有不同的页岩气聚集条件。滑脱断裂之上由一系列的同向逆断层形成的逆冲推覆体，地层变形强烈，且裂缝发育，导致页岩气保存条件变差。滑脱断裂下盘是页岩气主要富集区，地层平缓，不发育次级通天断裂，与下盘地层形成反向遮挡，易形成封闭，保存条件良好（图 1c）。
4. 结论（Conclusions）
（1）二叠系大隆组岩性以硅质岩、硅质页岩为主，夹少量灰岩。主要含气段存在于上段硅质页岩段，厚88.2 m，含气量平均为4.85 m3/t，含气性优越，资源潜力大。
（2）二叠系龙潭组上段以致密砂岩气为主，含气量平均为1.78 m3/t；下段以页岩气为主，泥岩厚达177.47 m，含气量平均为2.01 m3/t，具有泥岩厚度大，含气性好等特征。
（3）保存条件是页岩气富集关键，构造改造弱的封闭演化环境有利于页岩气保存，研究区滑脱断裂下盘是页岩气主要富集区，易形成封闭，保存条件良好。
（4）湘邵地1井在二叠系大隆组和龙潭组获得良好的页岩气显示，证实了湘中地区二叠系具有良好的页岩气资源潜力，对湘中地区页岩气资源潜力评价具有重要意义。
5. 基金项目（Fund support）
本文为中国地质调查局项目“中扬子地区油气页岩气调查评价”（DD20221659）资助的成果。
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图 1 甲玛矿区大地构造位置简图（a）及地质图（b）（据唐菊兴等，2010修改）
1—第四系残坡积物；2—多底沟组大理岩、灰岩；3—林布宗组板岩、角岩；4—花岗闪长斑岩；5—花岗斑岩；6—石英闪长玢岩；7—煌斑岩；8—细晶岩；9—矽卡岩；10—矽卡岩矿体；11—钻孔及编号；12—滑覆构造；13—矿段；14—隐伏岩体范围；JSS—金沙江缝合带；BNSZ—班公湖—怒江缝合带；SNMZ—狮泉河—嘉黎蛇绿岩混杂岩带；LMF—洛巴堆—米拉山断裂带；IYS—印度—雅鲁藏布江缝合带；SL—南拉萨地体；CL—中拉萨地体；NL—北拉萨地体
Figure 1. Tectonic location (a) and geological map (b) of Jiama ore district (modified from Tang Juxing et al., 2010)
1−Quaternary; 2−Marble and limestone of Duodigou Formation; 3−Slatew and hoenfels of Linbuzong Formation; 4−Granodiorite porphyry; 5−Granite porphyry; 6−Quartz diorite porphyry; 7−Lamprophyre; 8−Aplite; 9−Skarn; 10−Skarn ore−body; 11−Drilling and number; 12−Slip fault; 13−Segment of mining; 14−Concealed intrusive outline; JSS−Jinsha suture zone; BNSZ−Bangong−Nujiang suture zone; SNMZ−Shiquan River−Nam Tso mélange zone; LMF−Luobadui−Milashan Fault; IYS−Indus−Yarlung Zangbo suture zone; SL−Southern Lhasa subterrane; CL−Centhern Lhasa subterrane; NL−Northern Lhasa subterrane
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图 2 甲玛矿区0号勘探线地质剖面图
Figure 2. Geological cross section along No.0 prospecting line of Jiama ore district
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图 3 甲玛矿区不同产状电气石手标本照片
a~b—热液角砾岩胶结物中电气石（Tur−I）；c—石英+电气石脉（Tur−II），切穿早期的石英+黑云母+黄铜矿脉；d—石英+电气石脉（Tur−II），切穿早期的石英+辉钼矿脉；e—石英+电气石+黄铁矿脉（Tur−II）；f—石英+电气石+黄铁矿脉（Tur−II）和电气石+黄铁矿脉（Tur−III）；g—电气石脉（Tur−III），被后期的黄铁矿脉切穿；d—电气石脉（Tur−III），被后期的无矿石英脉切穿；i—团斑状电气石+黄铁矿（Tur−IV）；Tur—电气石；Py—黄铁矿；Cp—黄铜矿；Q—石英；Bt—黑云母；Mol—辉钼矿
Figure 3. Hand specimens of tourmalines with different occurrences of Jiama deposit
a−b−Tourmaline occurring as cement in hydrothermal breccias (Tur−I); c−Quartz + tourmaline vein (Tur−II) cutting quartz + biotite + chalcopyrite vein; d−Quartz + tourmaline vein (Tur−II) cutting quartz + molybdenite vein; e−Quartz + tourmaline + pyrite vein (Tur−II); f−Quartz + tourmaline + pyrite vein (Tur−II) and tourmaline + pyrite vein (Tur−III); g−Tourmaline vein (Tur−III) cut by pyrite vein; h−Tourmaline vein (Tur−III) cut by quartz vein; i−Porphyritic tourmaline + pyrite (Tur−IV); Tur−Tourmaline; Py−Pyrite; Cp−Chalcopyrite; Q−Quartz; Bt−Biotite; Mol−Molybdenite
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图 4 甲玛矿区不同产状电气石镜下照片
a—热液隐爆角砾岩胶结物中放射状电气石；b—石英+电气石脉，电气石半自形—自形，具有环带结构；c—电气石脉；d—电气石+黄铁矿脉，电气石半自形—自形，具有环带结构；e—电气石脉，电气石呈放射状；f—电气石+黄铁矿脉，电气石呈他形—半自形；g—团斑状电气石+黄铁矿，电气石呈他形；h~i—团斑状电气石+黄铁矿，电气石呈半自形—自形
Figure 4. Microphotos of tourmalines with different occurrences of Jiama deposit
a−Tur−I with radial texture; b−Euhedral to subhedral Tur−II shows distinct zoning texture; c−Fine−grained Tur−III; d−Euhedral to subhedral Tur−III shows distinct zoning texture and coexist with pyrite; e−Tur−III with radial texture; f−Fine−grained, subhedral and anhedral Tur−III coexist with pyrite; g−Anhedral Tur−IV coexist with pyrite; h−i−Subhedral and anhedral Tur−IV coexist with pyrite
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图 5 甲玛矿区不同产状电气石分类图解
a—Ca−X□−(Na+K)三元图解（底图据Henry et al., 2011）；b—Al−Fe−Mg图解（底图据Henry and Guidotti, 1985），图中1、2区分别代表富Li和贫Li花岗岩和伟晶岩、细晶岩，3区为富Fe3+的石英−电气石岩（热液蚀变花岗岩），4、5区分别代表含Al饱和矿物相和不含Al饱和矿物相的变泥质岩和变砂屑岩，6区代表富Fe3+的石英−电气石岩、钙质硅酸岩和变泥质岩，7区代表贫Ca变质超镁铁岩和富Cr、V的变质沉积岩，8区代表变质碳酸盐和变质辉石；c—Fe/(Fe+Mg)−X□/(Na+K+ X□)图解（底图据Henry et al., 2011）；d—Fe/(Fe+Mg)−Na/(Na+Ca)图解（底图据Henry et al., 2011）
Figure 5. Tourmaline discrimination diagrams with different occurrences of Jiama deposit
a−Ca−X□−(Na+K) diagram for tourmaline discrimination (after Henry et al., 2011); b−Plot Al−Fe−Mg for tourmaline from various rock types (after Henry and Guidotti, 1985), 1−Li−rich granitoid pegmatites and aplites; 2−Li−poor granitoid rocks and associated pegmatites and aplites, 3−Fe3+−rich quartz–tourmaline rocks (hydrothermally altered granites); 4−Metapelites and metapsammites coexisting with an Alsaturating phase; 5−Metapelites and metapsammites not coexisting with an Al−saturating phase; 6−Fe3+−rich quartz–tourmaline rocks, calcsilicate rocks, and metapelites; 7−Low−Ca metaultramafic rocks and Cr, V−rich metasediments; 8−Metacarbonates and meta−pyroxenites; c−Fe/(Fe+Mg)−X□/(Na+K+ X□) diagram for tourmaline discrimination (after Henry et al., 2011); d−Fe/(Fe+Mg)−Na/(Na+Ca) diagram for tourmaline discrimination (after Henry et al., 2011)
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图 6 甲玛不同产状电气石中阳离子占位及元素置换趋势图解
a—Al−Fe图解；b—Y位置Mg−Fe置换图解；c—Al−Na图解
Figure 6. Binary plot cation occupancies and exchange vectors in different types of tourmaline in Jiama deposit
a−Plot of Fe vs. Al; b−Plot of Fe vs. Mg in Y−site; c−Plot of Na vs. Al
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图 7 甲玛电气石环带成分趋势图及对应的背散射电子照片
Figure 7. Compositional profiles and the backscattered electronic images of tourmaline zones in Jiama deposit
表 1 甲玛矿区不同产状电气石电子探针分析结果（%）
Table 1 Compositions of tourmalines (%) with different occurrences of Jiama deposit
编号 JM-
233-1JM-
233-2028-
330-
1A028-
330-
1B028-
330-
1C028-
357-
1028-
357-
1A028-
357-
11A028-
357-
11B028-
357-
11C028-
357-
2028-
357-
3JM-
155-
1AJM-
155-
1BJM-
155-
2AJM-
155-
2BJM-
275-
1AJM-
275-
1BJM-
275-
1CJM-
275-
2A产状 Tur−I Tur−II 点位 核部 幔部 边部 核部 边部 核部 边部 核部 边部 核部 幔部 边部 核部 SiO2 30.29 30.3 36.03 33.38 35.52 35.76 33.43 32.84 33.4 36.64 34.9 34 36.09 35.89 35.84 35.14 34.53 31.35 33.1 34.87 TiO2 0.9 0.56 0.25 1.49 0.38 0.05 0.29 0.23 0.41 0.27 0.75 0.15 0.7 0.56 0.62 1.2 1.85 1.29 1.57 2.05 Al2O3 24.37 24.88 34.87 32.52 33.31 31.26 25.07 22.95 23.89 34.69 33.36 31.41 33.11 37.61 32.77 32.7 22.14 32.04 27.08 25.84 FeO 17.23 16.81 6.98 5.79 6.38 16.91 21.78 15.68 20.62 6.72 9.62 17.68 13.12 3.19 13.17 9.94 13.64 3.06 10.31 12.52 MgO 5.1 5.14 6.43 9.71 6.95 2.88 2.51 5 2.53 8.3 6.25 2.53 3.7 8.51 2.05 5.21 8.46 9.53 8.21 8.61 CaO 1.05 0.97 0.71 1.05 0.67 0.44 0.88 0.4 1.04 0.3 0.82 0.97 0.04 0.47 0.09 0.33 0.92 1.2 1.1 1.05 MnO 0 0 0 0 0.02 0.05 0.05 0 0.03 0.02 0 0.08 0.03 0 0 0 0 0 0 0 Na2O 2.32 2.42 2.33 2.47 2.33 2.58 2.49 2.71 2.22 2.58 2.24 2.35 2.41 2.52 2.2 2.5 2.53 2.16 2.4 2.4 K2O 0.03 0.06 0.01 0.02 0.04 0.03 0.04 0.09 0.03 0.03 0.03 0.05 0.03 0.01 0.04 0.04 0.03 0.02 0.03 0.06 F 0.16 0.04 0.18 0.17 0 0 0.01 0.05 0.02 0 0 0.09 0.09 0.22 0.02 0 0 0.08 0.08 0 Cl 0 0 0 0 0 0 0.01 0 0.01 0 0.01 0 0 0 0 0 0 0 0 0.02 H2O* 3.11 3.18 3.66 3.58 3.66 3.63 3.35 3.25 3.27 3.82 3.68 3.52 3.65 3.76 3.6 3.65 3.39 3.42 3.41 3.55 B2O3* 9.25 9.26 10.85 10.6 10.62 10.52 9.72 9.47 9.51 11.06 10.67 10.34 10.69 11.19 10.47 10.58 9.82 10.03 10 10.31 O=F 0.07 0.01 0.07 0.07 0 0 0 0.02 0.01 0 0 0.04 0.04 0.09 0.01 0 0 0.03 0.03 0 Total* 93.74 93.61 102.38 100.71 100.15 104.12 99.68 95.37 96.98 104.44 102.38 103.15 103.66 103.98 101.25 101.46 97.38 94.2 97.33 101.39 根据31 个阴离子（O, OH, F）计算 T: Si 5.69 5.69 5.77 5.48 5.81 5.91 5.98 6.03 6.11 5.76 5.68 5.72 5.87 5.58 5.95 5.77 6.11 5.43 5.76 5.88 Al 0.31 0.31 0.23 0.52 0.19 0.09 0.02 0 0 0.24 0.32 0.28 0.13 0.42 0.05 0.23 0 0.57 0.24 0.12 B 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 Z: Al 5.09 5.19 6 5.76 6 5.99 5.26 4.96 5.15 6 6 5.94 6 6 6 6 4.62 5.97 5.31 5.01 Mg 0.91 0.81 0 0.24 0 0.01 0.67 1.04 0.69 0 0 0.06 0 0 0 0 1.38 0.03 0.69 0.99 Fe3+ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Y: Al 0 0 0.35 0 0.24 0 0 0 0 0.18 0.09 0 0.21 0.46 0.36 0.11 0 0 0 0 Ti 0.13 0.08 0.03 0.18 0.05 0.01 0.04 0.03 0.06 0.03 0.09 0.02 0.09 0.07 0.08 0.15 0.25 0.17 0.21 0.26 Fe3+ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Mg 0.51 0.62 1.54 2.14 1.7 0.7 0 0.33 0 1.94 1.52 0.57 0.9 1.97 0.51 1.28 0.85 2.43 1.43 1.17 Mn 0 0 0 0 0 0.01 0.01 0 0.01 0 0 0.01 0 0 0 0 0 0 0 0 Fe2+ 2.71 2.64 0.93 0.79 0.87 2.34 3.26 2.41 3.15 0.88 1.31 2.49 1.78 0.41 1.83 1.37 2.02 0.44 1.5 1.76 ΣY 3.35 3.34 3 3.12 3 3.05 3.31 3.16 3.22 3.05 3.02 3.09 3 3 3 3 3.11 3.04 3.15 3.2 X: Ca 0.21 0.19 0.12 0.18 0.12 0.08 0.17 0.08 0.2 0.05 0.14 0.17 0.01 0.08 0.02 0.06 0.17 0.22 0.21 0.19 Na 0.84 0.88 0.72 0.79 0.74 0.83 0.86 0.96 0.79 0.79 0.71 0.77 0.76 0.76 0.71 0.79 0.87 0.73 0.81 0.79 K 0.01 0.01 0 0 0.01 0.01 0.01 0.02 0.01 0.01 0.01 0.01 0.01 0 0.01 0.01 0.01 0 0.01 0.01 X□ 0 0 0.15 0.03 0.13 0.09 0 0 0 0.16 0.14 0.05 0.23 0.16 0.27 0.14 0 0.05 0 0.01 OH 3.9 3.98 3.91 3.91 4 4 3.99 3.97 3.98 4 4 3.95 3.96 3.89 3.99 4 4 3.96 3.96 3.99 F 0.1 0.02 0.09 0.09 0 0 0.01 0.03 0.01 0 0 0.05 0.04 0.11 0.01 0 0 0.04 0.04 0 Cl 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.01 Fe/(Mg+Fe) 0.65 0.65 0.38 0.25 0.34 0.77 0.83 0.64 0.82 0.31 0.46 0.8 0.67 0.17 0.78 0.52 0.47 0.15 0.41 0.45 X□ /(X□+Na+K） 0 0 0.17 0.03 0.15 0.1 0 0 0.01 0.17 0.17 0.06 0.23 0.17 0.27 0.15 0 0.06 0 0.01 编号 JM-
275-
2BJM-
275-
2CJM-
415-
2AJM-
415-
2B035-
848-
1035-
848-
2A035-
848-
2B035-
848-
2C035-
848-
2D035-
848-
2E035-
767-
1035-
767-
2035-
803-
1039-
1112-
1039-
1112-
2039-
1112-
21JM-
415-
3JM-
415-
1AJM-
415-
1B产状 Tur−III Tur−IV 点位 幔部 边部 核部 核部 幔部 幔部 边部 边部 核部 边部 SiO2 33.86 33.87 32.15 26.34 37.19 37.71 36.97 36.54 36.66 36.53 37.05 36.7 36.76 36.16 36.32 36.77 34.42 35.37 29.33 TiO2 1.03 1.46 2.89 0.55 0.52 0.59 0.42 0.61 0.58 0.61 0.41 0.44 0.43 0.44 0.36 0.29 0.58 0.47 0.61 Al2O3 31.66 24.39 18.88 33.04 32.71 35.79 38.5 33.22 35.23 31.17 37.19 31.71 34.36 31.14 28.21 27.9 30.71 31.48 34.93 FeO 3.15 11.28 19.64 10.15 6.77 4.94 6.02 9.05 8.92 8.12 4.1 6.97 6.93 7.84 10.03 8.1 10.27 9.13 12.17 MgO 10.47 8.32 6.69 4.99 8.26 8.72 7.48 6.83 6.85 8.01 8.06 7.99 7.92 7.29 6.26 7.5 4.34 7.35 4.59 CaO 0.48 1.07 0.83 1.44 0.2 0.2 0.33 0.56 0.38 0.32 0.08 0.19 0.16 0.05 0.14 0.04 1 0.88 1.38 MnO 0.02 0.02 0 0 0 0.04 0.06 0 0 0.03 0 0 0.01 0 0.03 0.02 0 0 0 Na2O 2.2 2.43 2.71 1.86 2.52 2.33 2.42 2.31 2.5 2.66 2.71 2.61 2.3 2.44 2.5 2.44 2.15 2.59 2.02 K2O 0.02 0.02 0.07 0.03 0.03 0.02 0.03 0.03 0.02 0.03 0.03 0.03 0.02 0.03 0.03 0.04 0.03 0.03 0.05 F 0 0.16 0 0 0 0.1 0.03 0 0 0.2 0.03 0.18 0 0.01 0 0.1 0.16 0 0 Cl 0 0 0.01 0 0 0 0 0.01 0 0 0 0 0 0 0.01 0 0.01 0 0 H2O* 3.58 3.31 3.23 3.21 3.76 3.85 3.94 3.75 3.84 3.6 3.88 3.61 3.79 3.61 3.53 3.5 3.42 3.65 3.47 B2O3* 10.37 9.82 9.36 9.31 10.9 11.3 11.46 10.88 11.14 10.7 11.28 10.7 10.99 10.49 10.23 10.27 10.14 10.58 10.06 O=F 0 0.07 0 0 0 0.04 0.01 0 0 0.08 0.01 0.07 0 0.01 0 0.04 0.07 0 0 Total* 96.82 96.14 96.47 90.97 102.84 105.59 107.68 103.81 106.16 101.89 104.99 101.17 103.7 99.57 98.12 97.49 97.49 101.53 98.6 根据31 个阴离子（O, OH, F）计算 T: Si 5.68 5.99 5.97 4.92 5.93 5.8 5.6 5.84 5.72 5.94 5.71 5.96 5.81 5.99 6.17 6.22 5.9 5.81 5.07 Al 0.32 0.01 0.03 1.08 0.07 0.2 0.4 0.16 0.28 0.06 0.29 0.04 0.19 0.01 0 0 0.1 0.19 0.93 B 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 Z: Al 5.93 5.08 4.1 6 6 6 6 6 6 5.91 6 6 6 6 5.65 5.56 6 5.9 6 Mg 0.07 0.92 1.85 0 0 0 0 0 0 0.09 0 0 0 0 0.35 0.44 0 0.1 0 Fe3+ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Y: Al 0 0 0 0.18 0.08 0.29 0.48 0.09 0.2 0 0.46 0.04 0.21 0.07 0 0 0.1 0 0.18 Ti 0.13 0.19 0.4 0.08 0.06 0.07 0.05 0.07 0.07 0.07 0.05 0.05 0.05 0.06 0.05 0.04 0.07 0.06 0.08 Fe3+ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Mg 2.55 1.27 0 1.39 1.96 2 1.69 1.63 1.59 1.84 1.85 1.93 1.87 1.8 1.23 1.46 1.11 1.7 1.18 Mn 0 0 0 0 0 0 0.01 0 0 0 0 0 0 0 0 0 0 0 0 Fe2+ 0.44 1.67 3.05 1.58 0.9 0.64 0.76 1.21 1.16 1.1 0.53 0.95 0.92 1.09 1.42 1.15 1.47 1.25 1.76 ΣY 3.12 3.15 3.45 3.24 3.01 3 3 3 3.03 3.03 3 3 3.05 3.01 3 3 3 3.02 3.2 X: Ca 0.09 0.2 0.16 0.29 0.03 0.03 0.05 0.1 0.06 0.06 0.01 0.03 0.03 0.01 0.03 0.01 0.18 0.16 0.25 Na 0.71 0.83 0.97 0.67 0.78 0.7 0.71 0.71 0.76 0.84 0.81 0.82 0.71 0.78 0.82 0.8 0.72 0.82 0.68 K 0 0 0.02 0.01 0.01 0 0.01 0.01 0 0.01 0.01 0.01 0 0.01 0.01 0.01 0.01 0.01 0.01 X□ 0.19 0 0 0.03 0.18 0.27 0.23 0.18 0.17 0.1 0.17 0.14 0.26 0.2 0.14 0.19 0.1 0.01 0.06 OH 4 3.91 4 4 4 3.95 3.99 4 4 3.9 3.99 3.91 4 3.99 4 3.95 3.91 4 4 F 0 0.09 0 0 0 0.05 0.01 0 0 0.1 0.01 0.09 0 0.01 0 0.05 0.09 0 0 Cl 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Fe/(Mg+Fe) 0.14 0.43 0.62 0.53 0.31 0.24 0.31 0.43 0.42 0.36 0.22 0.33 0.33 0.38 0.47 0.38 0.57 0.41 0.6 X□ /(X□+Na+K） 0.21 0 0 0.05 0.19 0.28 0.24 0.2 0.19 0.11 0.17 0.14 0.27 0.2 0.15 0.19 0.12 0.02 0.08 
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