Metamorphic P–T Conditions and In–situ Rb–Sr Geochronology of the Kuanping Group in the Laoyu Area of the Qinling Orogenic Belt
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摘要:
秦岭造山带涝峪地区发育宽坪岩群的典型剖面，是研究宽坪岩群变质变形、构造热历史的重要区域。然而，由于缺乏对该地区宽坪岩群变质温压条件和年代学的约束，导致区域变质与多期变形事件的关系及地质意义认识仍不清楚。笔者以该地区宽坪岩群SN向剖面中的二云母石英片岩、含石榴子石二云母石英片岩、绿片岩和大理岩为研究对象，开展了详细的岩相学研究。在此基础上，重点对二云母石英片岩和含石榴子石二云母石英片岩进行了黑云母Ti温度计、多硅白云母地质压力计、变质相平衡模拟和原位LA–ICP–MS黑云母和白云母Rb–Sr年代学研究，进而探讨了涝峪地区宽坪岩群经历多期构造热事件的意义。野外和岩相学观察发现二云母石英片岩和绿片岩发生了强烈的变形，金云母大理岩经历了强烈的糜棱岩化作用。黑云母Ti温度计和多硅白云母压力计限定得到二云母石英片岩样品KP-3和KP-4的变质温压条件为300～500 ℃、2.0～8.0 kbar，对应的平均值为440 ℃、4.0 kbar。黑云母Ti温度计限定得到含石榴子石二云母石英片岩样品KP2202的变质温度为652～683 ℃。变质相平衡模拟P–T视剖面图计算得到二云母石英片岩样品KP-3和KP-4的变质温压条件为400～480 ℃和2.0～10 kbar；而含石榴子石二云母石英片岩样品KP2202的变质温压条件为645～680 ℃、8.0～9.0 kbar。综合地质温压计和相平衡模拟的结果，可以确定二云母石英片岩为绿片岩相变质作用的产物，而含石榴子石二云母石英片岩经历了低角闪岩相变质作用。原位LA–ICP–MS黑云母和白云母Rb–Sr分析显示二云母石英片岩记录两期等时线年龄，分别为～290 Ma和～155 Ma，而含石榴子石二云母石英片岩记录的等时线年龄为～110 Ma。因此涝峪地区宽坪岩群中的二云母石英片岩记录了3期等时线年龄，分别为～290 Ma、～155 Ma和～110 Ma。结合前人的研究结果，3期等时线年龄均代表了后期构造热事件的时代，其中～290 Ma的等时线年龄与古特提斯洋向北俯冲作用相对应，而～155 Ma和～110 Ma的等时线年龄可能与中生代时期北秦岭构造带发生强烈的变形和花岗岩岩浆活动导致的热重置有关。
Abstract:The laoyu area of the Qinling orogenic belt has a typical section of the Kuanping group, which is important for studying the metamorphism, deformation, and tectonothermal history of the Kuanping group. However, the metamorphic P–T conditions and chronology of the Kuanping group in this region are still lacking, which hinders our understanding of the relationship between its regional metamorphism and later deformation events, as well as their geological significances. In this study, detailed petrographic studies were carried out on two–mica quartz schist, garnet–bearing two–mica quartz schist, greenschist, and marble in the north–south section of the Kuanping group in this area. Based on this, the geological significances of multiple tectonothermal events that the Kuanping group in the Laoyu region underwent were examined with a focus on two-mica quartz schist and garnet–bearing two–mica quartz schist using Ti–in–biotite thermometry, phengite geobarometry, phase equilibrium modelling, and in situ LA–ICP–MS biotite and muscovite Rb–Sr dating. According to field and petrographic observations, two–mica quartz schist and greenschist were both significantly deformed, and phlogopite marble suffered strong mylonitization. The Ti–in–biotite thermometer and phengite geobarometer yielded the metamorphic PT conditions of 300～500 ℃ and 2.0～8.0 kbar (average values are 440 ℃ and 4.0 kbar) for the two–mica quartz schist samples KP-3 and KP-4. The Ti–in–biotite thermometry constrained the metamorphic temperature of the garnet–bearing two–mica quartz schist sample KP2202 to be 652～683 ℃. According to the PT pseudosection modeling, the metamorphic PT conditions of the two–mica quartz schists and and the garnet–bearing two–mica quartz schists are 400～480 ℃ and 2.0～10 kbar, and 645～680 ℃ and 8.0～9.0 kbar, respectively. On the basis of the results from the geothermobarometry and phase equilibrium modelling, the two–mica quartz schist is the consequence of greenschist–facies metamorphism, whereas the garnet–bearing two–mica quartz schist formed by low–amphibolite facies metamorphism. In–situ LA–ICP–MS biotite and muscovite Rb–Sr dating shows that the two–mica quartz schist records two isochron ages of ～290 Ma and ～155 Ma, while the garnet–bearing two–mica quartz schist records an isochron age of ～110 Ma. Consequently, the two–mica quartz schists in the Kuanping group of the Laoyu region record three isochron ages, which are ～290 Ma, ～155 Ma, and ～110 Ma. Combined with the results of previous studies, all three isochron ages represent the timings of late tectonothermal events, where the isochron age of ～290 Ma corresponds to the northward subduction of the paleo–Tethys Oceanic crust, while the isochron ages of ～155 Ma and ～110 Ma may be related to the intense deformation and thermal resetting caused by granitic magmatism in the North Qinling tectonic belt during the Mesozoic.
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各玛龙银多金属矿位于青海省海西州都兰县境内，矿区中心点坐标为35°42′00″N，98°42′00″E，位于那更康切尔大型银矿以南10 km处。自2016年以来，矿区开展了银多金属矿找矿工作，共圈出了8条含矿蚀变带，27条银多金属矿体，成因为浅成低温热液型，但成矿物质和热液来源一直未查明（张先超等，2017；王婧等，2020）。以往通过1/1万地磁测量，在矿区东南角圈定一处正负相伴的椭圆状磁异常M1，含矿蚀变带围绕M1磁异常呈环状分布，但磁异常与成矿关系未查明（裴有生等，2021）。本文主要是结合地物化资料的综合分析，来分析M1磁异常起因及其找矿潜力。
1. 矿区地质概况
各玛龙银多金属矿地处青海都兰县热水乡西南约120 km处，处于东昆仑成矿带的东段（图1，任家祺等，2019；薛长军等，2019）。区域上分布着那更康切尔大型银矿床、坑德弄舍大型多金属矿床、以及尕芝麻金矿点、叶陇沟金矿点等，成矿地质条件优越（杨涛等，2017；国显正等，2019；徐崇文等，2020；秦阳等，2020；谢升浪等，2020a, 2020b；谷子成等，2021）。
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图 1 各玛龙矿区大地构造位置图（薛长军等，2019）1.主缝合带；2.次缝合带；3.新元古代-早古生代缝合带俯冲方向，一侧有齿者为单向俯冲，两侧有齿者为双向俯冲；4.晚古生代-早古生代缝合带俯冲方向；5.A型俯冲带；6.构造单元界线；7.一级构造单元编号；8.二-三级构造单元编号；9.研究区；10.河流、湖泊Figure 1. Geotectonic location map of Gemalong mining area1.1 矿区地层、构造、岩浆岩
矿区出露地层较简单，主要为晚三叠统鄂拉山组（T3e）、第四系。鄂拉山组为一套陆相酸性火山碎屑岩建造夹少量正常沉积岩，为中酸性角砾熔岩、安山岩、英安岩、流纹岩、凝灰岩夹少量灰绿色、灰黄色细砂岩（图2、图3）。
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图 2 各玛龙矿区地质简图（裴有生等，2021）1.第四系；2.鄂拉山组砂岩；3.鄂拉山组英安岩；4.鄂拉山组流纹岩；5.鄂拉山组晶屑凝灰岩；6.鄂拉山组安山岩；7.鄂拉山组火山角砾岩；8.早三叠世二长花岗岩；9.早三叠世钾长花岗岩；10.早三叠世花岗闪长岩；11.早三叠世花岗斑岩；12.晚三叠世花岗闪长斑岩；13.矿（化）体类型及编号；14. 钻孔位置及编号；15.断层；16. 1∶1万地磁异常（M1）Figure 2. Geological sketch map of Gemalong mining area![]()
图 3 各玛龙矿区主要岩性显微镜下照片a.安山岩；b.晶屑凝灰岩；c.流纹岩；d.花岗斑岩；e.二长花岗岩；f.花岗闪长斑岩（1.斜长石；2.石英；3.角闪石）Figure 3. Micrograph of the main lithology in Gemalong mining area矿区主要发育近东西向、近南北向、北东向三组断裂构造，其中近南北向断裂为主要控矿和容矿构造。
矿区岩浆活动强烈，发育三叠世火山岩和侵入岩，其中火山岩分布在矿区南部和东部，岩性为安山岩、火山角砾岩、流纹岩、英安岩，从基性向中性演变。侵入岩分布在矿区北部，主要以早三叠世-晚三叠世侵入岩为主，为浅成-超浅成花岗闪长岩、二长花岗岩、钾长花岗岩、花岗斑岩、花岗闪长斑岩，一般呈岩株或岩脉状产出（张志颖，2019）。
2. 矿床特征
2.1 矿带及矿体特征
矿区已圈出8条含矿蚀变带，其中Ⅰ-Pb、Ⅱ-AgAuPb、Ⅲ-AgAuCuPbZn、Ⅳ-PbZn、Ⅵ-AgAu位于M1磁异常西侧，Ⅴ-PbAgAu、Ⅶ-Cu、Ⅷ-AuAg位于M1磁异常内，围绕M1磁异常由外至内存在低中温-中高温的成矿分带性，其中Ⅶ-Cu矿带位于M1磁异常中心位置，其含矿岩性为花岗闪长斑岩，圈出1条厚14.4 m的Cu矿化体，Cu平均品位为0.15%，最高品位为0.36%；Ⅲ-AgAuCuPbZn矿带为本区银金主矿带，控制长达1.5 km，控制斜深达600 m，厚60 m，含矿岩性为构造角砾岩，围岩为二长花岗岩和花岗斑岩。
矿区共圈出27条银多金属矿体，主要矿种为银，伴生矿种主要有金、铜、铅、锌。矿体呈脉状，长为68～
1050 m，厚为0.65～5.69 m，控制斜深120～600 m，Au品位为0.86×10−6～3.79 ×10−6，平均品位为0.86×10−6；Ag品位为45.3×10−6～1120 ×10−6，平均品位为326×10−6；Pb品位0.3%～3.52%，平均品位为0.42%；Zn品位为0.53%～2.86%，平均品位为0.65%；Cu品位为0.21%～1.72%，平均品位为0.37%。矿石结构主要为自形-半自形粒状结构、交代残留结构、乳滴状结构（图4），构造主要为细脉状构造，偶见稀疏浸染状构造。矿石矿物主要有黄铜矿、黄铁矿、方铅矿、闪锌矿、白铁矿、毒砂等，脉石矿物主要有石英、冰长石、方解石、绢云母、绿泥石、绿帘石等。
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图 4 各玛龙矿区主要矿石显微镜下照片a.黄铜矿呈团块状分布于毒砂间；b.方铅矿中呈乳滴状的辉银矿；c.黄铜矿与黄铁矿、白铁矿一起分布；d.方铅矿、黄铁矿、黄铜矿分布于石英颗粒间Figure 4. Microscopic photographs of the main ores in Gemalong mining area2.2 围岩蚀变
矿区发育一套斑岩型-浅成低温热液成矿系统的叠加热液蚀变，M1磁异常西侧的Ⅰ、Ⅱ、Ⅲ、Ⅳ、Ⅵ矿带发育以硅化、高岭土化、冰长石化、绿泥石化为主的典型低硫型浅成低温热液蚀变（图5a、图5b）；M1磁异常内的Ⅴ、Ⅶ、Ⅷ矿带地表发育面状的泥化，浅部钻孔内发育黄铁绢英岩化（图5c、图5d）。
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图 5 各玛龙矿区围岩蚀变照片a.Ⅲ矿带硅化、高岭土化；b.Ⅲ矿带围岩绿泥石、绿帘石化；c.Ⅴ矿带黄铁绢英岩化；d.M1磁异常地表泥化Figure 5. Photographs of wall rock alteration in Gemalong mining area2.3 矿床成因
经吉林大学孙丰月团队等学者对M1磁异常西侧Ⅲ-AgAuCuPbZn矿带分析研究，认为矿床成因为浅成低温热液型，矿床形成主要受近南北向构造控制，成矿以Ag、Au、Cu、Pb、Zn为主，主成矿温度分布在134.2～204.3 ℃，成矿深度为1.34～2.28 km，成矿热液以岩浆热液为主并伴随有大气降水的参与，其物质来源于晚三叠世陆相火山-岩浆作用（张先超等，2017；王婧等，2020）。
M1磁异常内的Ⅶ-Cu矿带与构造关系不大，含矿岩性为花岗闪长斑岩，黄铜矿、黄铁矿呈稀疏浸染状分布，与斑岩型铜矿特征类似。
3. M1磁异常特征
3.1 岩矿石磁物性特征
矿区的大部分岩石磁性都较弱，其中鄂拉山组的凝灰岩、流纹岩、安山岩、火山角砾岩和早三叠世的花岗岩、二长花岗岩、花岗岩闪长岩、闪长玢岩等岩体磁性整体不高，磁化率均值在11.54×10−6×4πSI～105.13×10−6×4πSI，最高值为
1127.13 ×10−6×4πSI，其剩余磁化强度在6.28×10−3～301.09×10−3A/m（表1）。但变化梯度大，推测与构造、热液等活动影响着磁性矿物的形成有关（孙忠实等，2005；冯军等，2022）。表 1 各玛龙地区磁性参数特征一览表Table 1. List of magnetic parameter characteristics in Gemalong mining area岩性 磁化率κ范围 （10−6×4π·SI） 磁化率κ平均值 （10−6×4π·SI） 剩磁范围Jr （10−3A/m） 剩磁Jr平均值 （10−3A/m） 英安岩 32.71～ 1061.65 261.48 5.85～350.42 85.2 安山岩 2.17～112.31 43.26 1.33～439.35 84.18 二长花岗岩 6.77～31.50 31.50 4.49～67.19 16.19 流纹岩 0.22～48.73 23.09 3.73～16.25 7.45 闪长岩 13.57～86.26 13.57 4.39～22.23 8.09 火山角砾岩（岩芯） 2.87～24.71 11.54 1.70～12.52 6.28 晶屑凝灰岩 13.03～81.39 39.21 3.53～16.95 9.35 花岗斑岩 5.2～41.19 22.01 4.88～12.09 8.90 银金矿石 0.12～33.76 18.69 4.43～15.55 9.56 花岗闪长斑岩 384.36～931.06 512.48 1.63～27.81 11.63 表 2 钻孔岩芯磁性参数特征一览表Table 2. List of magnetic parameter characteristics in Drill岩性 位置 标本数（块） 磁化率κ范围 （10−6×4π·SI） 最小值 最大值 平均值 黄铜矿化、磁黄铁矿化
花岗闪长斑岩QZ003钻孔34.35～96.3 m 11 302.39 1209.58 621.79 碎裂岩 QZ003钻孔96.3～103.65 m 7 177.46 651.74 322.4 晶屑凝灰岩 QZ003 11.74～14.45， 103.65～140 m 17 28.57 473.49 207.39 火山角砾岩 QZ002 20.35～80 m 32 177.46 651.74 322.4 3.2 M1磁异常特征
M1磁异常为一椭圆状磁异常，长轴轴向为近东西向，长约
1500 m，宽约1300 m。异常正值区基本上在南部，负值区在北部，ΔTmax为490 nT，ΔTmin为−275 nT（图6）。磁异常北部负值区地表岩性为鄂拉山组晶屑凝灰岩、二长花岗岩、黑云母花岗岩，正值区地表岩性为鄂拉山组安山岩、流纹岩，此两种岩性的磁性均较弱，均不足以引起如此规模异常，推测磁性体有一定的埋深和规模。![]()
图 6 各玛龙矿区M1磁异常ΔT等值线图Figure 6. The ΔT isogram of M1 Magnetic Anomaly in Gemalong mining area根据已知磁性参数数据，对CP01磁法剖面进行二度半人机交互反演圈出6个磁性体（图7）。通过对1号和4号磁性体工程验证，1号反应Ⅴ-PbAuAg矿带，在黄铁绢英岩化带内圈定一铅矿体，含矿岩性及围岩为火山角砾岩（图8）；4号反应Ⅶ-Cu矿带，在黄铁绢英岩化与泥化的混合带中圈定Cu矿化体，含矿岩性为花岗闪长斑岩，圈出5条铜（金）矿化体，总厚为14.4 m，Cu平均品位为0.15%，最高品位为0.36%（图9）。其余磁性体均未验证，其中2号磁性体规模、埋深较大，形态上呈一岩体状，截面积为
66185 m2，长度为400 m，体积为26474082 m3，埋深＞500 m，朝东陡倾，推测为隐伏岩体。![]()
图 7 CP01号磁测剖面拟合反演图1.流纹岩；2.晶屑凝灰岩；3.二长花岗岩；4.Pb矿化体；5.Cu矿化体；6.流纹质火山角砾岩；7.安山岩；8.磁异常；9.钻孔位置及编号Figure 7. Magnetic profile fitting inversion map of CP01.![]()
图 8 Ⅴ-Pb含矿蚀变带QZ002钻孔（a）和Ⅶ-Cu含矿蚀变带QZ003钻孔（b）剖面图1.第四系残坡积物；2.流纹质火山角砾岩；3.流纹岩；4.晶屑凝灰岩；5.安山岩；6.石英斑岩；7.花岗闪长斑岩；8.Pb矿（化）体；9.破碎蚀变带；10.Cu矿（化）体；11.Au矿（化）体；12.钻孔位置及编号；13.实测及推测地质界线；14.平均品位/厚度；15.样品及采样位置Figure 8. (a)The section of QZ002in the V-PbOre-bearing alteration zone and (b)the section of QZ003in the VII-Cu Ore-bearing alteration zone从激电异常看，M1磁异常区内1∶
5000 激电异常整体呈为低阻高极化的面状异常特征，东侧未封闭，电阻率平均500 Ω·m，极化率平均6.8%，激电异常规模、形态均与磁异常套合，推测激电异常是隐伏岩体浅部的黄铁矿绢英岩化带的反映（图9）。从测深异常看，M1磁异常区经测量两条激电、可控源大地音频电磁测深综合剖面（DPM-1、DPM-2），激电异常均显示为低阻高极化，电阻率平均为500 Ω·m，极化率平均为6.8%，最高为11.2%；可控源大地音频电磁测深反应，深部隐伏一长为600 m，宽为400 m，深
1000 ～1500 m的低阻体，形态上呈一岩体，现认为测深异常反应的是黄铁绢英岩化带，从低阻异常中心位置看，两条剖面低阻异常区对应较好，隐伏岩体向东埋深逐渐增大（图10）。![]()
图 10 DPM-1（a）、DPM-3地物（b）（激电中梯、可控源大地音频电磁测深）综合剖面图1.晶屑凝灰岩；2.流纹岩；3.安山岩；4.可控源大地音频电磁测深电阻率等值线图；5.激电中梯剖面视电阻率曲线；6.激电中梯剖面视极化率曲线；7.地磁剖面ΔT曲线Figure 10. (a) The Composite profile of DPM-1 and (b) DPM-3 (Ip intermediate gradient\Controlled source magnetotelluric sounding)从化探异常看，围绕M1磁异常1∶
10000 土壤剖面具分带性，具体为Cu、Sn、Bi等中高温元素异常集中分布于M1磁异常区，Ag、Au、Pb等中低温元素异常扩散范围较远，推测M1磁异常深部隐伏岩体为本区成矿物质和热液来源（图11）。从地质特征看，围绕M1磁异常自外而内类似斑岩型的青盘岩化、黄铁绢英岩化、泥化蚀变分带；垂向上M1磁异常区地表为面状泥化，再往下为黄铁绢英岩化，深部测深高阻与低阻过度带推测是钾化，也具斑岩型蚀变分带。平面上成矿元素从从Ⅰ含矿蚀变带Pb、Ⅲ含矿蚀变带AgAu、Ⅳ含矿蚀变带PbZn、Ⅴ含矿蚀变带AgAuPb，再到CuⅡ含矿蚀变带、AuⅠ含矿蚀变带，围绕磁异常自外而内具低温-中高温的元素组合分带性（图12a），通过综合分析建立了M1磁异常预测找矿模型（图12b），磁异常区发现的Ⅶ-Cu矿带含矿岩性为花岗闪长斑岩，黄铜矿化呈稀疏浸染状分布，与斑岩型铜矿特征类似，现认为Ⅶ-Cu矿带为M1磁异常深部隐伏岩体的一个小岩脉，推测隐伏岩体岩性为花岗闪长斑岩，M1磁异常具备寻找斑岩型铜矿的潜力（李保平等，2011）。因此，综上认为各玛龙银多金属矿床可能发育浅部浅成低温热液矿化-深部斑岩型矿化的这样一套成矿系统，与我国西藏多龙矿集区、紫金山矿田类似（唐菊兴等，2014，2016；张德全等，2003，2005；李斌等，2015）。
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图 12 矿区成矿元素及蚀变分带平面（a）和剖面（b）示意图1.晚三叠世鄂拉山组晶屑凝灰岩；2.晚三叠世鄂拉山组流纹岩；3.晚三叠世鄂拉山组火山角砾岩；4.晚三叠世鄂拉山组安山岩；5.早三叠世二长花岗岩；6.晚三叠世花岗闪长岩；7.青磐岩化；8.黄铁绢英岩化；9.钾化；10.泥化；11.矿（化）体类型及编号；12.化探元素异常组合及分布范围；13.M1磁异常位置Figure 12. （a）The plane and （b）sectionsketch map of Metallogenic elements and Alteration zoning in the mining area.3.3 找矿预测
根据综合分析，M1磁异常是由深部隐伏的花岗闪长斑岩体中发育磁黄铁矿化引起，地表面状的低阻高极化激电异常是浅部泥化带中发育黄铁矿化引起，测深异常是对深部黄铁绢英岩化带中发育金属硫化物的反应；再结合地表及浅部已经存在泥化、黄铁绢英岩化、钾化的面状蚀变分带，认为M1磁异常具备寻找斑岩型矿的较大潜力。经验证浅部已发现含铜花岗闪长斑岩脉，深部尚存在厚大的测深低阻体，认为是黄铁绢英岩化带中发育黄铜矿等金属硫化物的反应，存在较大的找矿潜力。
4. 结论
（1）根据矿区地物化资料综合推测M1磁异常为深部隐伏的花岗闪长斑岩体引起；M1磁异常区域的地质显示其与斑岩型矿床的成矿地质条件相近，具备寻找斑岩型矿的较大潜力。
（2）因为激电异常是隐伏岩体浅部的黄铁矿绢英岩化带的反映，测深异常反应的是黄铁绢英岩化带。下步应根据测深、磁法、激电综合异常，对M1磁异常应采用钻探工程进行深部验证，揭穿浅部的黄铁绢英岩化带，至深部钾化带附近寻找斑岩型矿。
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图 1 秦岭造山带地质简图（据Dong et al.，2011a修改）
LLWF.灵宝–鲁山–舞阳断裂；LLF.洛南–栾川断裂；N–SCB.华南板块北缘；1.华北板块南缘；2.宽坪岩群；3.秦岭杂岩；4.商丹缝合带；5.二郎坪群；6.南秦岭南部带；7.南秦岭北部带；8.MLSZ.勉略缝合带；9.大别地体
Figure 1. Simplified tectonic division of the Qinling orogenic belt
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图 2 涝峪地区地质图及采样位置（据陕西省地质局区测队，1966；陕西地质局13队，1972修改）
Figure 2. Simplified geological map of Laoyu area, showing the with sample location
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图 3 野外露头照片
a. 强烈褶皱变形的二云母石英片岩与绿片岩；b. 绿片岩；c、d. 二云母石英片岩；e、f. 糜棱岩化含金云母大理岩
Figure 3. Photographs of outcrop
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图 4 二云母石英片岩和含石榴子石二云母石英片岩显微照片
a.二云母石英片岩样品KP-3片理发生褶皱弯曲（单偏光）；b.二云母石英片岩样品KP-3部分区域TIMA扫描图显示褶皱变形；c.二云母石英片岩样品KP-3中的黑云母、白云母、石英和钠长石等矿物（正交偏光）；d.二云母石英片岩样品KP-4中黑云母、白云母和石英等矿物（单偏光）；e.二云母石英片岩样品KP-4中黑云母、白云母和石英等矿物以及明显的片理构造（正交偏光）；f.二云母石英片岩样品KP-4部分区域TIMA扫描图；g、h.含石榴子石二云母石英片岩样品KP2202石榴子石变斑晶和基质矿物黑云母，白云母，斜长石，和石英（单偏光）；i.含石榴子石二云母石英片岩样品KP2202中黑云母、白云母、石英、斜长石和钛铁矿等矿物（背散射照片）
Figure 4. Photomicrographs of the two-mica quartz schist and the garnet-berting two-mica quartz schist
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图 5 含石榴子石二云母石英片岩的黑云母Mg–Fe2+图（a）于长石分类图解（b）
Figure 5. (a) Biotite Mg–Fe2+ diagram, (b) plagioclase XOr–XAb–XAn diagram in the garnet-bearing two-mica quartz schist sample KP2202
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图 6 含石榴石的二云母石英片岩KP2202石榴子石变斑晶成分剖面
Figure 6. Compositional profiles of garnet porphyroblast from the garnet-bearing two-mica quartz schist sample KP2202
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图 7 绿片岩及糜棱岩化金云母大理岩显微照片与TIMA扫描图
a. 绿片岩样品KP-2中绿泥石、绿帘石和阳起石等矿物（单偏光）；b. 绿片岩样品KP-5中定向分布的绿泥石、绿帘石和阳起石等矿物（正交偏光）；c. 糜棱岩化含金云母大理岩样品KP-1中的方解石碎斑与碎基以及金云母（正交偏光）；d. 糜棱岩化含金云母大理岩中经历变形的金云母（单偏光）；e. TIMA扫描图（与图7d具有相同视域）
Figure 7. Photo-micrographs of green schist and mylonitized phlogopite-bearing marble
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图 8 二云母石英片岩样品KP-3与KP-4的黑云母Ti温度计结果（a）与多硅白云母压力计计算结果（b）
Figure 8. The P-T conditions calculated by (a) Ti-in-biotite geothermometer and (b) phengite geobarometer
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图 9 二云母石英片岩样品KP-3的P–T视剖面图（a）、黑云母XTi（bt）和XFe（bt）等值线的P–T视剖面图（b）
Figure 9. (a) P–T pseudosection, (b) P–T pseudosection with isopleths of XTi(bt) and XFe(bt) for the two-mica quartz schist sample KP-3
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图 10 二云母石英片岩样品KP-4的P–T视剖面图（a）、黑云母XTi（bt）和XFe（bt）等值线的P–T视剖面图（b）
Figure 10. (a) P–T pseudosection, (b) P–T pseudosection with isopleths of XTi(bt) and XFe(bt) for the two-mica quartz schist sample KP-4
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图 11 含石榴子石二云母石英片岩样品KP2202的P–T视剖面图(a)、石榴子石XPy和XGrs等值线的P–T视剖面图（b）
Figure 11. (a) P–T pseudosection, (b) P–T pseudosection with isopleths of XPy and XGrs for the garnet-bearing two-mica quartz schist sample KP2202
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图 12 原位LA–ICP–MS黑云母和白云母Rb–Sr定年的部分分析点位
a.二云母石英片岩样品KP-3；b.二云母石英片岩样品KP-4；c、d.含石榴子石二云母石英片岩样品KP2202
Figure 12. Spot locations for in-situ LA-ICP-MS biotite and muscovite Rb–Sr analysis
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图 13 原位LA–ICP–MS黑云母和白云母Rb–Sr等时线年龄图
a.二云母石英片岩样品KP-3；b.二云母石英片岩样品KP-4；c.含石榴子石二云母石英片岩样品KP2202
Figure 13. In situ LA–ICP–MS biotite and muscovite Rb–Sr isochron diagrams
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图 14 宽坪岩群变质温压条件及P–T轨迹
轨迹1和2分别为桐柏地区宽坪岩群北部和南部构造单元变质P–T轨迹（Liu et al., 2011）；轨迹3为红土岭地区含石榴子石石英片岩变质P–T轨迹（王海杰等，2021）；区域4和5分别为涝峪地区宽坪岩群中二云母石英片岩和含石榴子石二云母石英片岩变质温压条件（本研究）
Figure 14. Summary of metamorphic P–T conditions and paths for the Kuanping Group
表 1 二云母石英片岩样品KP-3和KP-4中黑云母和白云母成分
Table 1 Mineral composition of biotite and muscovite in the two-mica quartz schist of sample KP-3 and KP-4
样品
矿物KP-3 Bt Ms SiO2 36.86 38.09 37.80 37.83 37.22 37.78 37.82 37.52 52.08 49.36 51.96 50.57 48.34 47.86 48.25 47.59 TiO2 1.02 0.96 1.11 0.89 0.83 1.11 0.97 1.13 0.12 0.11 0.19 0.19 0.12 0.11 0.12 0.20 Al2O3 18.09 18.02 17.74 16.90 17.33 17.52 17.45 17.36 27.74 29.36 28.04 29.78 33.02 33.08 32.75 32.79 FeO 20.10 19.12 19.74 19.25 20.17 19.42 20.42 20.14 2.39 2.13 2.56 2.29 2.16 1.98 2.12 2.22 MnO 0.18 0.14 0.16 0.04 0.00 0.09 0.12 0.09 0.00 0.04 0.01 0.04 0.00 0.01 0.02 0.05 MgO 8.79 9.19 9.24 9.53 9.49 9.62 9.22 9.74 2.84 2.40 2.74 2.36 1.31 1.29 1.36 1.23 CaO 0.01 0.00 0.11 0.03 0.02 0.04 0.00 0.04 0.00 0.02 0.01 0.01 0.00 0.00 0.00 0.00 Na2O 0.06 0.07 0.03 0.05 0.08 0.05 0.04 0.09 0.16 0.20 0.18 0.22 0.33 0.41 0.48 0.35 K2O 8.85 9.03 8.21 8.81 8.96 8.80 9.23 8.52 10.33 10.20 10.34 10.52 10.52 10.75 10.53 10.72 Totals 93.96 94.61 94.15 93.34 94.09 94.42 95.27 94.63 95.66 94.94 96.03 95.98 95.80 95.49 95.63 95.14 Oxygens 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 Si 2.84 2.89 2.88 2.91 2.86 2.88 2.87 2.86 3.44 3.31 3.43 3.34 3.20 3.19 3.21 3.19 Ti 0.06 0.06 0.06 0.05 0.05 0.06 0.06 0.07 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 Al 1.64 1.61 1.59 1.53 1.57 1.57 1.56 1.56 2.16 2.32 2.18 2.32 2.58 2.60 2.57 2.59 Fe3+ 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.06 0.00 0.00 0.00 0.00 0.00 0.00 Fe2+ 1.29 1.21 1.26 1.24 1.30 1.24 1.30 1.28 0.13 0.12 0.14 0.13 0.12 0.11 0.12 0.12 Mn 0.01 0.01 0.01 0.00 0.00 0.01 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Mg 1.01 1.04 1.05 1.09 1.09 1.09 1.04 1.11 0.28 0.24 0.27 0.23 0.13 0.13 0.14 0.12 Ca 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Na 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.02 0.03 0.02 0.03 0.04 0.05 0.06 0.05 K 0.87 0.87 0.80 0.87 0.88 0.85 0.89 0.83 0.87 0.87 0.87 0.89 0.89 0.91 0.89 0.92 Sum 7.73 7.70 7.66 7.71 7.75 7.71 7.74 7.72 6.92 6.95 6.92 6.95 6.97 6.99 6.98 6.99 Mg＃ 0.44 0.46 0.45 0.47 0.46 0.47 0.45 0.46 0.68 0.67 0.66 0.65 0.52 0.54 0.53 0.50 AlⅥ 0.47 0.50 0.47 0.44 0.43 0.45 0.44 0.42 1.67 1.61 1.66 1.78 1.78 1.77 1.77 1.55 XTi 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 XFe 0.46 0.43 0.44 0.44 0.45 0.44 0.46 0.45 0.07 0.06 0.07 0.06 0.06 0.05 0.06 0.06 XMg 0.36 0.37 0.37 0.39 0.38 0.38 0.37 0.39 0.14 0.12 0.13 0.11 0.06 0.06 0.07 0.06 T（℃）① 428 405 461 385 333 463 405 468 - - - - - - - - T（℃）② 491 482 495 464 455 488 476 485 - - - - - - - - 
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续表1 样品
矿物KP-4 Bt Ms SiO2 39.47 39.17 38.65 38.87 37.79 37.96 37.32 37.30 49.08 49.20 51.91 50.22 48.64 49.35 48.80 48.45 TiO2 0.83 0.83 0.93 0.76 0.84 0.79 0.98 0.96 0.23 0.09 0.20 0.09 0.05 0.23 0.11 0.05 Al2O3 17.77 18.12 17.97 18.22 18.05 17.53 17.42 17.19 34.04 35.13 30.48 33.82 33.17 32.12 32.23 32.49 FeO 16.53 16.74 16.65 16.10 17.53 17.59 18.11 17.90 0.64 0.57 1.09 0.57 1.92 2.37 1.89 2.01 MnO 0.04 0.12 0.11 0.11 0.13 0.07 0.07 0.14 0.00 0.01 0.00 0.15 0.00 0.03 0.00 0.00 MgO 10.91 11.11 10.94 10.96 10.53 10.48 10.70 10.86 1.57 1.46 2.53 1.81 1.51 1.77 1.71 1.43 CaO 0.14 0.12 0.11 0.12 0.03 0.05 0.09 0.05 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 Na2O 0.04 0.05 0.01 0.09 0.09 0.09 0.03 0.01 0.35 0.37 0.10 0.26 0.31 0.32 0.32 0.28 K2O 7.97 8.14 8.00 8.20 8.99 8.92 8.49 8.61 9.68 9.82 9.31 9.71 10.59 10.74 10.61 10.76 Totals 93.71 94.38 93.35 93.41 93.97 93.49 93.21 93.02 97.03 98.12 96.68 98.09 96.18 96.92 95.67 95.47 Oxygens 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 11 Si 2.95 2.92 2.91 2.92 2.87 2.89 2.86 2.86 3.18 3.15 3.36 3.22 3.21 3.24 3.24 3.22 Ti 0.05 0.05 0.05 0.04 0.05 0.05 0.06 0.06 0.01 0.00 0.01 0.00 0.00 0.01 0.01 0.00 Al 1.57 1.59 1.60 1.61 1.61 1.58 1.57 1.56 2.60 2.66 2.33 2.55 2.58 2.49 2.52 2.55 Fe3+ 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.07 0.07 0.05 0.07 0.00 0.00 0.00 0.00 Fe2+ 1.04 1.04 1.05 1.01 1.11 1.12 1.16 1.15 0.04 0.03 0.06 0.03 0.11 0.13 0.10 0.11 Mn 0.00 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 Mg 1.22 1.23 1.23 1.23 1.19 1.19 1.22 1.24 0.15 0.14 0.24 0.17 0.15 0.17 0.17 0.14 Ca 0.01 0.01 0.01 0.01 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Na 0.01 0.01 0.00 0.01 0.01 0.01 0.00 0.00 0.04 0.05 0.01 0.03 0.04 0.04 0.04 0.04 K 0.76 0.77 0.77 0.79 0.87 0.87 0.83 0.84 0.80 0.80 0.77 0.79 0.89 0.90 0.90 0.91 Sum 7.60 7.63 7.62 7.63 7.72 7.72 7.72 7.73 6.89 6.90 6.83 6.88 6.97 6.98 6.97 6.98 Mg＃ 0.54 0.54 0.54 0.55 0.52 0.51 0.51 0.52 0.81 0.82 0.81 0.85 0.58 0.57 0.62 0.56 AlⅥ 0.52 0.51 0.51 0.53 0.48 0.47 0.43 0.42 1.84 1.87 1.73 1.82 1.78 1.72 1.75 1.77 X（Ti） 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.01 0.00 0.00 0.00 0.00 0.01 0.00 0.00 X（Fe） 0.37 0.37 0.37 0.36 0.39 0.40 0.40 0.40 0.02 0.02 0.03 0.02 0.05 0.06 0.05 0.06 X（Mg） 0.43 0.44 0.43 0.44 0.42 0.42 0.43 0.43 0.08 0.07 0.12 0.09 0.07 0.09 0.08 0.07 T（℃）① 381 382 433 341 378 346 442 440 - - - - - - - - T（℃）② 455 452 465 447 454 446 463 458 - - - - - - - - 注：Mg#=Mg/（Mg+Fe2+），XTi=Ti/（Ti+Fe2++Mg+AlVI），XFe=Fe/（Ti+Fe2++Mg+AlVI），XMg=Mg/（Ti+Fe2++Mg+AlVI）；①为Henry等（2005）计算的黑云母Ti温度计结果；②为Wu等（2015）计算的黑云母Ti温度计结果。
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表 2 含石榴子石二云母石英片岩样品KP2202中黑云母、白云母、斜长石和石榴子石成分
Table 2 Mineral compositions of biotite, muscovite, plagioclase and garnet in the garnet-bearing two-mica quartz schist sample KP2202
样品 KP2202 位置 接触 基质 矿物 Bt Bt SiO2 34.34 33.63 34.90 34.56 34.02 34.09 34.27 35.23 34.54 34.79 33.95 34.59 34.34 34.55 34.55 34.41 TiO2 2.82 2.87 3.08 3.23 3.13 3.08 3.21 2.95 3.06 3.30 3.15 3.37 3.42 3.39 3.08 3.30 Al2O3 17.78 18.10 18.31 18.33 17.94 18.11 17.61 18.47 18.73 17.94 17.86 18.26 18.42 18.32 18.68 18.09 Cr2O3 0.08 0.08 0.03 0.05 0.03 0.07 0.12 0.05 0.03 0.01 0.01 0.02 0.02 0.10 0.02 0.00 FeO 23.43 22.76 23.32 23.57 23.76 23.44 22.97 22.73 22.26 21.81 21.73 22.11 22.36 22.02 21.00 22.34 MnO 0.43 0.32 0.53 0.54 0.48 0.52 0.39 0.31 0.29 0.29 0.27 0.24 0.25 0.24 0.19 0.30 MgO 5.51 6.19 5.30 5.15 4.95 5.73 5.78 6.22 5.99 6.17 6.17 6.23 6.08 6.34 6.58 6.36 CaO 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Na2O 0.14 0.13 0.14 0.12 0.10 0.09 0.06 0.13 0.17 0.12 0.08 0.05 0.10 0.17 0.10 0.08 K2O 10.01 9.41 10.12 9.99 9.90 9.99 9.91 10.22 10.27 9.99 10.35 9.75 10.21 9.91 10.01 10.00 SrO 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 NiO 0.01 0.00 0.01 0.02 0.00 0.05 0.04 0.00 0.01 0.00 0.01 0.04 0.03 0.07 0.00 0.03 Totals 94.56 93.49 95.75 95.56 94.31 95.16 94.34 96.30 95.36 94.42 93.59 94.66 95.23 95.11 94.22 94.91 Oxygens 11.00 11.00 11.00 11.00 11.00 11.00 11.00 11.00 11.00 11.00 11.00 11.00 11.00 11.00 11.00 11.00 Si 2.71 2.67 2.72 2.70 2.70 2.68 2.71 2.71 2.69 2.73 2.70 2.70 2.68 2.69 2.70 2.69 Ti 0.17 0.17 0.18 0.19 0.19 0.18 0.19 0.17 0.18 0.19 0.19 0.20 0.20 0.20 0.18 0.19 Al 1.66 1.70 1.68 1.69 1.68 1.68 1.64 1.68 1.72 1.66 1.67 1.68 1.69 1.68 1.72 1.67 Cr 0.01 0.01 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 Fe3+ 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Fe2+ 1.55 1.51 1.52 1.54 1.58 1.54 1.52 1.46 1.45 1.43 1.44 1.45 1.46 1.43 1.37 1.46 Mn 0.03 0.02 0.04 0.04 0.03 0.04 0.03 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.01 0.02 Mg 0.65 0.73 0.62 0.60 0.59 0.67 0.68 0.71 0.70 0.72 0.73 0.73 0.71 0.74 0.77 0.74 Ca 0.00 0.00 0.00 0.00 0.00 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 0.02 0.02 0.02 0.01 0.01 0.02 0.03 0.02 0.01 0.01 0.02 0.03 0.02 0.01 K 1.01 0.96 1.01 1.00 1.00 1.00 1.00 1.00 1.02 1.00 1.05 0.97 1.02 0.98 1.00 1.00 Sum 7.80 7.79 7.78 7.77 7.78 7.81 7.78 7.79 7.80 7.76 7.81 7.75 7.79 7.77 7.77 7.79 Mg# 0.30 0.33 0.29 0.28 0.27 0.30 0.31 0.33 0.32 0.34 0.34 0.33 0.33 0.34 0.36 0.34 T（℃） 651.93 658.34 662.65 670.67 667.59 665.50 673.55 657.52 664.55 678.05 673.30 681.07 682.69 682.28 669.56 678.18 XAn - - - - - - - - - - - - - - - - XAb - - - - - - - - - - - - - - - - XOr - - - - - - - - - - - - - - - - XAlm - - - - - - - - - - - - - - - - XSps - - - - - - - - - - - - - - - - Xpy - - - - - - - - - - - - - - - - XGrs - - - - - - - - - - - - - - - -
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续表2 样品 KP2202 位置 - 边部 核部 矿物 Ms Pl Grt Grt SiO2 45.44 45.36 45.60 45.33 45.76 45.74 61.80 62.30 61.47 36.66 36.54 37.05 36.37 36.23 36.94 36.56 TiO2 1.09 1.14 0.62 0.71 0.62 0.65 0.00 0.05 0.02 0.06 0.08 0.10 0.06 0.03 0.00 0.08 Al2O3 35.01 34.91 35.29 35.11 35.43 34.84 24.06 23.28 24.25 20.64 21.19 21.14 21.02 20.84 20.98 20.83 Cr2O3 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.03 0.00 0.02 0.00 0.04 0.00 0.00 0.00 0.00 FeO 1.50 1.52 1.68 1.67 1.54 1.65 0.15 0.18 0.08 29.03 28.37 30.50 33.61 33.81 33.93 33.70 MnO 0.00 0.01 0.09 0.02 0.06 0.01 0.00 0.00 0.04 8.10 6.34 5.91 5.62 5.64 5.58 5.37 MgO 0.54 0.60 0.57 0.54 0.52 0.62 0.00 0.01 0.01 1.36 1.25 1.36 1.51 1.55 1.61 1.63 CaO 0.02 0.00 0.06 0.00 0.08 0.00 5.94 5.71 6.28 3.45 5.26 3.41 1.27 1.05 1.02 0.97 Na2O 0.36 0.40 0.50 0.34 0.40 0.33 8.33 8.48 8.36 0.00 0.00 0.00 0.01 0.03 0.02 0.02 K2O 11.28 11.44 11.12 10.89 11.26 11.03 0.19 0.18 0.22 0.00 0.02 0.00 0.00 0.00 0.00 0.03 SrO 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.16 0.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 NiO 0.00 0.02 0.04 0.01 0.00 0.02 0.00 0.03 0.01 0.01 0.00 0.00 0.01 0.00 0.02 0.02 Totals 95.24 95.39 95.57 94.63 95.68 94.90 100.53 100.41 100.82 99.34 99.04 99.51 99.48 99.19 100.09 99.22 Oxygens 11.00 11.00 11.00 11.00 11.00 11.00 8.00 8.00 8.00 12.00 12.00 12.00 12.00 12.00 12.00 12.00 Si 3.05 3.04 3.05 3.05 3.05 3.07 2.73 2.76 2.72 3.00 2.98 3.01 2.98 2.98 3.00 3.00 Ti 0.06 0.06 0.03 0.04 0.03 0.03 0.00 0.00 0.00 0.00 0.01 0.01 0.00 0.00 0.00 0.01 Al 2.77 2.76 2.78 2.79 2.79 2.76 1.25 1.22 1.26 1.99 2.04 2.02 2.03 2.02 2.01 2.01 Cr 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Fe3+ 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.00 0.01 0.00 0.00 0.01 0.03 0.00 0.00 Fe2+ 0.08 0.09 0.09 0.09 0.09 0.09 0.00 0.00 0.00 1.97 1.93 2.07 2.29 2.29 2.31 2.31 Mn 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.56 0.44 0.41 0.39 0.39 0.38 0.37 Mg 0.05 0.06 0.06 0.05 0.05 0.06 0.00 0.00 0.00 0.17 0.15 0.16 0.18 0.19 0.20 0.20 Ca 0.00 0.00 0.00 0.00 0.01 0.00 0.28 0.27 0.30 0.30 0.46 0.30 0.11 0.09 0.09 0.09 Na 0.05 0.05 0.07 0.04 0.05 0.04 0.71 0.73 0.72 0.00 0.00 0.00 0.00 0.01 0.00 0.00 K 0.97 0.98 0.95 0.94 0.96 0.95 0.01 0.01 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Sum 7.02 7.04 7.04 7.01 7.03 7.01 5.00 5.00 5.01 8.00 8.00 7.98 8.00 8.00 7.99 7.99 Mg# 0.39 0.41 0.38 0.36 0.38 0.40 - - - - - - - - - - T（°C） - - - - - - - - - - - - - - - - XAn - - - - - - 0.28 0.27 0.29 - - - - - - - XAb - - - - - - 0.71 0.72 0.70 - - - - - - - XOr - - - - - - 0.01 0.01 0.01 - - - - - - - XAlm - - - - - - - - - 0.66 0.65 0.70 0.77 0.77 0.78 0.78 XSps - - - - - - - - - 0.19 0.15 0.14 0.13 0.13 0.13 0.13 Xpy - - - - - - - - - 0.06 0.05 0.06 0.06 0.06 0.07 0.07 XGrs - - - - - - - - - 0.10 0.15 0.10 0.04 0.03 0.03 0.03 注：Mg#=Mg/（Mg+Fe2+）, XAn = Ca/（Ca+Na+K）, XAb = Na/（Ca+Na+K）, XOr = K/（Ca+Na+K）; XAlm = Fe2+/（Fe2++ Mn + Mg + Ca）, XSps = Mn/
（Fe2+ + Mn + Mg + Ca）, XPy = Mg/（Fe2+ + Mn + Mg + Ca）, XGrs = Ca/（Fe2+ + Mn + Mg + Ca）。
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表 3 糜棱岩化含金云母大理岩样品KP-1中金云母成分
Table 3 Mineral compositions of phlogopite in the mylonitizd phlogopite-bearing marble sample KP-1
样品 KP-1 矿物 Phl SiO2 42.92 43.62 43.77 43.51 42.62 43.51 42.03 43.87 43.86 44.71 43.33 41.89 42.29 43.08 TiO2 0.60 0.82 0.55 0.39 0.55 0.73 0.78 0.46 0.41 0.39 0.49 0.53 0.57 0.62 Al2O3 16.35 15.69 15.68 16.11 16.33 16.48 16.59 15.23 15.02 15.02 15.95 17.42 17.57 17.54 FeO 1.45 1.62 1.23 1.91 1.35 1.48 1.70 1.57 1.48 1.55 2.02 1.71 1.87 1.82 MnO 0.02 0.00 0.03 0.00 0.01 0.03 0.00 0.06 0.00 0.00 0.00 0.00 0.00 0.00 MgO 22.49 22.69 22.96 22.92 22.37 22.06 22.36 23.16 22.77 23.38 22.63 22.06 21.88 21.84 CaO 0.02 0.02 0.05 0.02 0.06 0.04 0.00 0.11 0.05 0.02 0.02 0.08 0.07 0.09 Na2O 0.09 0.00 0.08 0.05 0.03 0.05 0.08 0.03 0.03 0.02 0.00 0.11 0.09 0.04 K2O 10.34 10.31 10.22 9.94 10.51 10.45 10.61 10.29 10.39 10.40 10.41 10.60 10.69 10.78 Totals 94.27 94.75 94.56 94.86 93.83 94.82 94.15 94.78 94.01 95.49 94.85 94.41 95.03 95.79 Oxygens 11 11 11 11 11 11 11 11 11 11 11 11 11 11 Si 3.01 3.04 3.05 3.02 3.00 3.03 2.96 3.06 3.08 3.09 3.02 2.94 2.95 2.98 Ti 0.03 0.04 0.03 0.02 0.03 0.04 0.04 0.02 0.02 0.02 0.03 0.03 0.03 0.03 Al 1.35 1.29 1.29 1.32 1.36 1.35 1.38 1.25 1.24 1.22 1.31 1.44 1.45 1.43 Fe3+ 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Fe2+ 0.09 0.09 0.07 0.11 0.08 0.09 0.10 0.09 0.09 0.09 0.12 0.10 0.11 0.11 Mn 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Mg 2.35 2.36 2.38 2.37 2.35 2.29 2.35 2.40 2.38 2.41 2.35 2.31 2.28 2.25 Ca 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.01 0.00 0.00 0.00 0.01 0.01 0.01 Na 0.01 0.00 0.01 0.01 0.00 0.01 0.01 0.00 0.00 0.00 0.00 0.02 0.01 0.01 K 0.92 0.92 0.91 0.88 0.94 0.93 0.95 0.91 0.93 0.92 0.93 0.95 0.95 0.95 Sum 7.76 7.74 7.74 7.74 7.77 7.73 7.79 7.76 7.75 7.74 7.76 7.79 7.78 7.76 Mg＃ 0.97 0.96 0.97 0.96 0.97 0.96 0.96 0.96 0.96 0.96 0.95 0.96 0.95 0.96 注：Mg#=Mg/（Mg+Fe2+）。
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表 4 用于变质相平衡模拟计算的全岩主量元素成分
Table 4 Whole-rock compositions used for phase equilibrium modelling
样品号 全岩成分 （%） SiO2 TiO2 Al2O3 Fe2O3 FeO MnO MgO CaO Na2O K2O P2O5 LOI Total KP-3 71.24 0.65 12.38 2.27 3.22 0.04 2.28 0.15 1.41 3.33 0.07 2.37 99.41 KP-4 79.14 0.52 9.34 1.78 1.88 0.03 1.84 0.11 0.11 2.76 0.05 2.22 99.78 KP2202 67.62 0.83 15.35 1.14 4.56 0.12 1.54 0.94 1.14 4.30 0.06 1.67 99.27 样品号 相平衡模拟中的各组分含量（mol%） SiO2 Al2O3 CaO MgO FeO K2O Na2O TiO2 O* KP-3 71.790 7.351 0.162 3.425 4.436 2.140 1.377 0.493 0.861 图9a、图9b KP-4 78.552 5.463 0.117 2.723 2.890 1.747 0.106 0.388 0.665 图10a、图10b KP2202 71.096 9.510 1.059 2.414 4.913 2.883 1.162 0.656 0.452 图11a、图11b
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表 5 二云母石英片岩样品KP-3的原位LA–ICP–MS黑云母和白云母Rb–Sr同位素数据
Table 5 In-situ LA–ICP–MS biotite and muscovite Rb–Sr isotopic data for two-mica quartz schist sample KP-3
点位 87Rb/86Sr ±1σ 87Sr/86Sr ±1σ KP-3-1 18.0166 0.5389 0.7905 0.0054 KP-3-2 29.3416 0.7385 0.8532 0.006 KP-3-3 16.2009 0.2907 0.8181 0.0062 KP-3-4 11.5061 0.3663 0.7899 0.0087 KP-3-5 18.3369 0.634 0.7584 0.0045 KP-3-6 12.2389 0.2162 0.8048 0.0076 KP-3-7 9.3939 0.2595 0.7795 0.0064 KP-3-8 7.7139 0.1553 0.7546 0.0055 KP-3-9 21.9059 1.0708 0.792 0.0062 KP-3-10 25.4976 1.1164 0.8426 0.0173 KP-3-11 14.0422 0.6728 0.7924 0.0106 KP-3-12 5.4361 0.1816 0.7467 0.0082 KP-3-13 25.5866 1.2185 0.8107 0.0158 KP-3-14 13.3642 0.3398 0.7751 0.0106 KP-3-15 23.5856 0.3439 0.8086 0.0043 KP-3-16 22.733 0.6971 0.7778 0.0089 KP-3-17 9.3486 0.2784 0.7632 0.0067 KP-3-18 13.6249 0.4057 0.7588 0.0059 KP-3-19 14.5342 0.3112 0.804 0.0065 KP-3-20 8.2599 0.2115 0.7797 0.006 KP-3-21 12.2192 0.2215 0.8111 0.0043 KP-3-22 7.9982 0.1289 0.7937 0.0036 KP-3-23 12.193 0.2094 0.7927 0.0043 KP-3-24 19.7496 0.2937 0.795 0.005 KP-3-25 15.4003 0.207 0.7731 0.0056 KP-3-26 9.3778 0.2017 0.7779 0.0034 KP-3-27 24.297 1.0354 0.8161 0.0112 KP-3-28 12.085 0.3581 0.7911 0.0082 KP-3-29 33.6078 0.9551 0.8365 0.0091 KP-3-30 7.9611 0.246 0.7531 0.0046 KP-3-31 49.9564 4.4104 0.8407 0.0177 KP-3-32 4.1449 0.1021 0.7694 0.0053 KP-3-33 7.4286 0.1467 0.7646 0.0044 KP-3-34 20.7555 0.8895 0.8076 0.0073 KP-3-35 27.518 0.5935 0.8106 0.0049 KP-3-36 1.5058 0.1521 0.8035 0.0167 KP-3-37 1.2356 0.2309 0.8377 0.051 KP-3-38 0.2741 0.0215 0.7836 0.0107 KP-3-39 0.1349 0.0185 0.6885 0.0255 KP-3-40 0.3264 0.0426 0.7562 0.0312
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表 6 二云母石英片岩样品KP-4原位LA–ICP–MS黑云母和白云母Rb–Sr同位素数据
Table 6 In-situ LA–ICP–MS biotite and muscovite Rb–Sr isotopic data for two-mica quartz schist sample KP-4
点位 87Rb/86Sr ±1σ 87Sr/86Sr ±1σ KP-4-1 25.4466 0.454 0.8146 0.01 KP-4-2 41.2259 0.8178 0.8114 0.0079 KP-4-3 50.6532 1.1725 0.7922 0.0087 KP-4-4 26.9311 0.438 0.8014 0.0064 KP-4-5 29.0531 0.6666 0.8158 0.0067 KP-4-8 33.0924 1.6649 0.7448 0.0052 KP-4-9 16.6476 0.937 0.7454 0.0037 KP-4-10 41.2109 0.9943 0.8229 0.0076 KP-4-11 52.4346 0.8291 0.8285 0.0066 KP-4-12 2.8604 0.0843 0.7251 0.0041 KP-4-15 26.8263 1.3235 0.8287 0.0105 KP-4-16 34.8779 2.2549 0.8122 0.0077 KP-4-17 17.2552 0.4462 0.7808 0.0089 KP-4-18 23.5465 0.563 0.8049 0.007 KP-4-19 50.8047 1.5759 0.8137 0.0101 KP-4-20 97.7716 2.5025 0.936 0.0087 KP-4-21 18.9715 0.5902 0.7807 0.0095 KP-4-22 41.6778 2.2637 0.8275 0.0074 KP-4-23 20.7999 1.0744 0.8215 0.0108 KP-4-25 41.9771 0.9381 0.7939 0.0067 KP-4-26 22.8923 0.7196 0.829 0.0054 KP-4-27 31.4178 1.6919 0.7813 0.0101 KP-4-28 75.0006 1.6558 0.9076 0.0148 KP-4-29 39.9303 0.4539 0.8809 0.0064 KP-4-30 32.9889 0.4273 0.8558 0.0057 KP-4-31 23.0713 0.4501 0.8065 0.007 KP-4-32 25.7233 0.2788 0.8232 0.0048 KP-4-33 22.6323 0.6414 0.7783 0.0051 KP-4-34 28.391 0.3844 0.8181 0.0062 KP-4-35 22.4479 0.319 0.814 0.0049 KP-4-36 2.8775 0.0568 0.7304 0.0022 KP-4-37 3.76 0.1344 0.7325 0.0032 KP-4-38 2.9363 0.067 0.7258 0.0018 KP-4-39 1.4073 0.0335 0.7136 0.0018 KP-4-40 1.6294 0.0683 0.7213 0.0016
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表 7 含石榴子石二云母石英片岩样品KP2202原位LA–ICP–MS黑云母和白云母Rb–Sr同位素数据
Table 7 In-situ LA–ICP–MS biotite and muscovite Rb–Sr isotopic data for garnet-bearing two-mica quartz schist sample KP2202
点位 87Rb/86Sr ±1σ 87Sr/86Sr ±1σ 备注 KP2202-1 21.3446 0.3768 0.9061 0.0048 Ms type-1 KP2202-2 19.0802 0.3769 0.8668 0.0042 Ms type-1 KP2202-3 16.1607 0.2511 0.8231 0.0034 Ms type-1 KP2202-4 16.9611 0.2304 0.8289 0.0036 Ms type-1 KP2202-5 18.6972 0.2885 0.8846 0.0048 Ms type-1 KP2202-6 17.0929 0.2986 0.8348 0.0044 Ms type-1 KP2202-7 18.5684 0.3145 0.8665 0.0049 Ms type-1 KP2202-30 16.5679 0.2640 0.8370 0.0051 Ms type-1 KP2202-31 17.7241 0.3035 0.8377 0.0039 Ms type-1 KP2202-32 18.4186 0.3005 0.8608 0.0037 Ms type-1 KP2202-40 17.4755 0.2839 0.8292 0.0035 Ms type-1 KP2202-41 17.9974 0.4653 0.8317 0.0037 Ms type-1 KP2202-42 17.6600 0.2556 0.8307 0.0043 Ms type-1 KP2202-43 16.9642 0.2634 0.7930 0.0043 Ms type-1 KP2202-44 16.5281 0.2798 0.7920 0.0034 Ms type-1 KP2202-45 16.7014 0.3672 0.8173 0.0042 Ms type-1 KP2202-46 16.5453 0.3081 0.8112 0.0036 Ms type-1 KP2202-11 16.9159 0.2898 0.7945 0.0044 Ms type-2 KP2202-12 18.1469 0.3106 0.8010 0.0036 Ms type-2 KP2202-13 17.9112 0.3321 0.7941 0.0043 Ms type-2 KP2202-14 19.9469 0.3315 0.7963 0.0041 Ms type-2 KP2202-22 18.9035 0.3015 0.8021 0.0043 Ms type-2 KP2202-23 19.8987 0.3443 0.8003 0.0038 Ms type-2 KP2202-24 16.6555 0.3950 0.7835 0.0034 Ms type-2 KP2202-25 19.9471 0.3723 0.7958 0.0044 Ms type-2 KP2202-26 18.9892 0.3332 0.7960 0.0048 Ms type-2 KP2202-27 13.2982 0.4708 0.7900 0.0042 Ms type-2 KP2202-28 21.1990 0.5195 0.7927 0.0044 Ms type-2 KP2202-29 18.4951 0.4068 0.7961 0.0044 Ms type-2 KP2202-33 12.7696 1.1655 0.7887 0.0030 Ms type-2 KP2202-34 20.1844 0.5434 0.8058 0.0044 Ms type-2 KP2202-35 20.0061 0.3414 0.7961 0.0042 Ms type-2 KP2202-36 20.5787 0.3102 0.7904 0.0041 Ms type-2 KP2202-8 160.8024 8.5605 1.0268 0.0116 Bt KP2202-9 144.9303 10.2530 1.0157 0.0092 Bt KP2202-10 213.5181 8.7199 1.0947 0.0099 Bt KP2202-15 94.4528 9.3357 0.9103 0.0055 Bt KP2202-16 159.5003 4.9954 1.0145 0.0085 Bt KP2202-17 13.2294 1.5834 0.7817 0.0039 Bt KP2202-18 167.0161 7.1487 1.0332 0.0092 Bt KP2202-19 356.2216 22.0736 1.3801 0.0217 Bt KP2202-20 298.3693 22.7725 1.1905 0.0173 Bt KP2202-21 88.7981 7.0720 0.9202 0.0058 Bt KP2202-37 105.1556 9.6343 0.8970 0.0079 Bt KP2202-38 65.7936 2.7566 0.8580 0.0062 Bt KP2202-39 125.3506 3.5819 0.9300 0.0086 Bt KP2202-47 219.2769 13.2706 1.0912 0.0131 Bt KP2202-48 19.1462 1.1634 0.7931 0.0047 Bt KP2202-49 174.1023 10.2901 1.0229 0.0126 Bt KP2202-50 27.7117 1.1152 0.7805 0.0040 Bt
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