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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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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