Genesis and Metamorphic Evolution of Garnet Amphibolite Monzogneiss from Suichang-Dazhe Region in Southwestern Zhejiang Province
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摘要: 浙西南遂昌-大柘地区八都群中分布一套含石榴石、角闪石的二长片麻岩，发育典型石榴石"白眼圈"反应结构，但其成因及变质演化目前尚不明确.运用矿物X射线电子探针微区分析、LA-ICP-MS锆石U-Pb定年并结合全岩主微量元素进行了研究.识别出3个阶段的变质矿物共生组合：进变质阶段（M1）矿物组合为石榴石变斑晶内部的包裹体矿物石榴石+角闪石+斜长石+石英（Grt1+Amp1+Pl1+Q），变质峰期矿物组合（M2）为石榴子石变斑晶幔部和基质矿物钾长石+斜长石+黑云母+石英（Grt2+Kf2+Pl2+Bt2+Q），退变质阶段矿物组合（M3）为"白眼圈"后成合晶角闪石+斜长石+黑云母+钛铁矿（Amp3+Pl3+Bt3+Ilm）.矿物地质温压计和相平衡模拟估算的3阶段P-T条件分别为：进变质阶段为600~700 ℃/0.60~0.65 GPa，变质峰期为800~820 ℃/0.94~0.96 GPa，退变质阶段为550~700 ℃/0.56~0.71 GPa，变质程度达到麻粒岩相，变质作用PTt轨迹显示顺时针型式，具有近等温降压（ITD）特征，暗示其经历了地壳加厚和快速折返过程.岩石地球化学特征显示其原岩为准铝质A型花岗岩，含有少量幔源组分，形成于造山后的陆壳拉张环境；锆石U-Pb定年呈现二阶段年龄特征，成岩年龄为1.83~1.85 Ga，表明石榴角闪二长片麻岩的原岩形成于古元古代，变质年龄为220~230 Ma，显示了印支期变质作用对古元古代花岗岩的改造，是浙西南地区对印支期古太平洋板块向华南板块俯冲过程的响应，也为浙西南地区印支期造山作用提供了新的证据.Abstract: There is a set of garnet amphibolite monzogneiss which developed typical garnet "white eye socket" structure from the Badu Group in Suichang-Dazhe region, southwestern Zhejiang Province. However, its genesis and metamorphic evolution remain unclear. In this study, mineral X-ray microprobe microanalysis, LA-ICP-MS zircon U-Pb dating and whole-rock major and trace element analyses were carried out to address these questions. Three stages of mineral assemblages have been identified:the prograde metamorphic assemblages (M1) are mineral inclusions garnet+amphibole+plagioclase+quartz (Grt1+Amp1+Pl1+Q) preserved in the garnet porphyroblasts, the peak metamorphic assemblages (M2) are represented by the "garnet-mantles" and the matrix minerals garnet+K-feldspar+plagioclase+biotite+quartz (Grt2+Kf2+Pl2+Bt2+Q), whereas the retrograde assemblages (M3) are composed of amphibole+plagioclase+biotite+ilmenite (Amp3+Pl3+Bt3+Ilm) symplectites rimming the garnet porphyroblasts. Thermobarometric computation and phase equilibrium modeling show that the metamorphic conditions of the garnet amphibolite monzogneiss are 600-700℃/0.60-0.65 GPa for the M1 stage, 800-820℃/0.94-0.96 GPa for the metamorphic peak M2 stage, and 550-700℃/0.56-0.71 GPa for the retrograde M3 stage, respectively. Metamorphic grade reached granulite facies and metamorphism PTt paths are characterized by clockwise pattern involving the nearly isothermal decompression (ITD) segments, indicating crustal thickening and rapid exhumation process. Petrogeochemistry shows that the protolith of monzogneiss is metaluminous A-type granite with some mantle-derived components which formed in continental crust extensional environment during post orogeny. LA-ICP-MS zircon U-Pb dating indicates two-stage age characteristics, in which the diagenetic age of 1.83-1.85 Ga suggests the protolith of monzogneiss formed in the Paleoproterozoic and the metamorphic age of 220-230 Ma shows the reworking of Indosinian metamorphism to Paleoproterozoic granite. It is the response to the subduction of Indo Pacific plate into South China plate during Indosinian, which provides new evidence for Indosinian orogeny in the southwestern Zhejiang.
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图 1 浙西南地区地质简图
据文献胡雄健等(1991)、甘晓春等(1993)、Yu et al.(2009)、Xia et al.(2012)、Zhao et al.(2014)修改
Fig. 1. Geological sketch of South China and southeastern Zhejiang region (SZR)
图 3 石榴角闪二长片麻岩野外照片
Fig. 3. Field photographs showing the occurrences of the garnet amphibole monzogneiss
图 4 石榴角闪二长片麻岩显微照片
a.石榴石“白眼圈结构”；b.石榴石具有角闪石、斜长石包裹体，角闪石发育钛铁矿后成合晶；c.石榴石发育宽大斜长石冠状边，斜长石显示成分环带；d.退变质晚期石榴石水化生成绿色角闪石；e.基质中钾长石发生熔融，定向分布；f.钛铁矿发育榍石退变反应边.矿物缩写：Grt.石榴子石；Amp.角闪石；Kf.钾长石；Pl.斜长石；Q.石英；Bt.黑云母；Ilm.钛铁矿；Sph.榍石
Fig. 4. Photomicrographs of garnet amphibole monzogneiss
图 5 石榴石变斑晶显微照片和探针测试点位置(a)，石榴石成分剖面(b)
Fig. 5. Photomicrographs and location of test point in garnet (a) and compositional profile of Garnet (b)
图 6 角闪石成分命名表(a)；角闪石Ti-Na+K、AlⅣ-Ti与变质相关系图解(b和c)
图a据Leake et al.(1997)；图b、c据靳是琴(1991)；图中坐标均为以23个氧原子为基础的角闪石分子式中的阳离子数
Fig. 6. Nomenclature diagrams of amphibole (a) and the diagram of relationship between Ti-Na+K、AlⅣ-Ti and metamorphic grade in amphiboles (b and c)
图 7 样品在MTNCKF MASH体系下的P-T视剖面
设石英过量，在视剖面上绘制石榴石的XMg、XCa和斜长石的An等值线.黑十字代表所测石榴石成分区域，白粗线和箭头代表石榴角闪二长片麻岩的P-T轨迹，灰线代表饱和水固相线.主要矿物缩写：Grt.石榴石；Amp.角闪石；Pl.斜长石；Hed.钙铁辉石；Bt.黑云母；Ilm.钛铁矿；Sph.榍石；Kf.钾长石；Fa.铁橄榄石；Mu.白云母；Ab.钠长石；Zo.黝帘石；San.透长石；Mic.微斜长石；Melt.熔体
Fig. 7. P-T pseudosection calculated in the system MTNCKF MASH with the excess of quartz
图 9 锆石U-Pb年龄谐和图和稀土元素球粒陨石标准化配分曲线
球粒陨石标准化数据来自Sun and McDonough(1989)
Fig. 9. Zircon U-Pb dating results and REE pattern of samples
图 10 石榴角闪二长片麻岩TAS图解分类(a)，样品的铝饱和度图解(b)，FeOT/(FeOT+MgO) vs SiO2图解(c)，K2O vs Na2O变化关系(d)
图a据Middlemost(1994)；图b、c据Frost et al.(2001)、Frost and Frost(2011)；图d据Turner et al.(1996).浙西南A型、S型花岗岩和华夏地区古元古代变质沉积岩、正变质岩及斜长角闪岩化学成分据胡雄健等(1991)、王一先等(1998)、李献华等(1999)、Li et al.(2000)、Yu et al.(2009)、Liu et al.(2009)、Xia et al.(2012)
Fig. 10. The total alkali vs silica (TAS) diagram (a), chemical compositions of samples in terms of aluminum saturation index (b), FeOT/(FeOT+MgO) vs SiO2 diagram for the monzogneiss (c), K2O vs Na2O relation (d)
图 11 石榴角闪二长片麻岩原岩及构造背景判别图解
图a、b据Sylvester(1998)；图c据Harris et al.(1986)；图d据Pearce et al.(1984)、Pearce(1996)；其他数据来源与图 10一致
Fig. 11. Source and tectonic setting discrimination diagrams of garnet amphibole mozogneiss
图 12 石榴角闪二长片麻岩微量元素蛛网图和稀土元素球粒陨石标准化配分图解
原始地幔成分据Taylor and McLennan(1985)；球粒陨石成分据McDonough and Sun(1995)；其他数据来源与图 10一致
Fig. 12. Primitive mantle-normalized multiple trace element diagrams and chondrite-normalized REE patterns of the monzogneiss
表 1 石榴角闪二长片麻岩主要矿物的代表性电子探针测试结果(%)
Table 1. Representaive microprobe analyses of minerals from garnet amphibole monzogneiss (%)
石榴石 边部 幔部 核部 幔部 边部 测试点号 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 SiO2 37.64 37.39 37.79 37.39 37.30 36.88 36.10 36.37 37.37 37.16 37.28 37.13 37.11 37.27 36.84 37.06 36.80 36.62 TiO2 0.03 0.10 0.06 0.08 0.08 0.02 0.08 0.00 0.07 0.01 0.00 0.05 0.02 0.00 0.11 0.05 0.05 0.06 Al2O3 20.67 20.98 20.78 20.94 20.60 20.82 20.54 20.41 20.73 20.61 20.65 20.65 20.61 21.07 20.60 20.78 20.51 20.26 Cr2O3 0.00 0.00 0.00 0.00 0.00 0.01 0.03 0.05 0.06 0.00 0.00 0.01 0.07 0.00 0.06 0.00 0.00 0.00 FeOT 29.70 29.54 28.52 28.55 28.35 29.19 29.80 31.14 29.90 29.56 29.01 28.84 28.85 28.62 28.71 28.75 29.43 29.30 MnO 1.02 0.78 0.47 0.64 0.54 0.73 0.71 0.89 0.70 0.65 0.54 0.52 0.48 0.55 0.38 0.46 1.16 1.04 MgO 1.00 1.20 1.36 1.29 1.30 1.20 1.25 1.14 1.25 1.38 1.29 1.39 1.42 1.47 1.41 1.36 0.83 0.78 CaO 9.60 9.90 10.64 10.18 10.65 9.93 9.53 8.69 9.50 9.50 9.91 10.43 10.32 10.21 10.20 10.64 9.73 9.67 Na2O 0.04 0.04 0.03 0.02 0.04 0.04 0.01 0.05 0.01 0.00 0.02 0.01 0.01 0.02 0.00 0.02 0.04 0.02 K2O 0.01 0.01 0.02 0.00 0.00 0.00 0.02 0.00 0.00 0.02 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.02 totals 99.71 99.93 99.68 99.07 98.86 98.81 98.07 98.73 99.57 98.90 98.72 99.02 98.89 99.21 98.31 99.13 98.54 97.77 O 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 Si 3.02 2.99 3.02 3.01 3.01 2.98 2.95 2.96 3.00 3.00 3.01 2.99 2.99 2.99 2.99 2.98 2.99 3.00 Ti 0.00 0.01 0.00 0.01 0.01 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.00 Al 1.96 1.98 1.96 1.99 1.96 1.98 1.98 1.96 1.96 1.96 1.97 1.96 1.96 1.99 1.97 1.97 1.97 1.96 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 0.00 0.00 Fe3+ 0.00 0.04 0.00 0.00 0.03 0.06 0.13 0.13 0.02 0.03 0.01 0.06 0.05 0.03 0.04 0.07 0.05 0.03 Fe2+ 1.99 1.94 1.91 1.92 1.89 1.92 1.91 1.99 1.99 1.97 1.95 1.89 1.90 1.89 1.91 1.87 1.96 1.98 Mn 0.07 0.05 0.03 0.04 0.04 0.05 0.05 0.06 0.05 0.04 0.04 0.04 0.03 0.04 0.03 0.03 0.08 0.07 Mg 0.12 0.14 0.16 0.16 0.16 0.15 0.15 0.14 0.15 0.17 0.16 0.17 0.17 0.18 0.17 0.16 0.10 0.10 Ca 0.83 0.85 0.91 0.88 0.92 0.86 0.83 0.76 0.82 0.82 0.86 0.90 0.89 0.88 0.89 0.92 0.85 0.85 Na 0.01 0.01 0.01 0.00 0.01 0.01 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 k 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 0.00 0.00 totals 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 Py 3.98 4.73 5.38 5.15 5.16 4.77 4.97 4.50 4.93 5.49 5.17 5.50 5.63 5.82 5.64 5.34 3.31 3.15 Alm 66.27 65.43 63.30 64.11 63.20 65.17 66.28 68.89 66.45 65.90 65.11 63.79 63.98 63.79 64.24 63.52 66.07 66.38 Gro 27.45 28.09 30.26 29.28 30.42 28.40 27.16 24.63 27.04 27.14 28.50 29.56 29.32 29.15 29.25 30.10 27.97 28.08 Sp 2.30 1.74 1.06 1.45 1.21 1.66 1.59 1.99 1.58 1.46 1.22 1.16 1.08 1.25 0.87 1.04 2.64 2.39 进变质阶段矿物组合 峰期变质阶段矿物组合 Amp Amp Amp Pl Pl Pl Amp Amp Amp Bt Bt Bt Pl Pl Pl Kf Kf Kf SiO2 38.61 39.80 39.39 57.18 56.49 57.18 37.92 38.64 38.50 34.56 34.15 34.74 58.51 58.63 58.00 63.93 64.68 64.06 TiO2 1.42 1.27 1.37 0.05 0.00 0.05 2.05 1.77 1.87 5.41 5.10 5.31 0.00 0.03 0.00 0.00 0.00 0.02 Al2O3 12.12 13.07 12.82 27.03 26.76 27.03 11.78 11.91 11.84 13.55 13.40 13.63 25.59 27.16 25.79 18.39 18.93 18.61 Cr2O3 0.02 0.00 0.00 0.00 0.00 0.00 0.04 0.08 0.06 0.02 0.08 0.00 0.09 0.01 0.00 0.06 0.00 0.00 FeOT 27.35 24.23 24.61 0.28 0.55 0.28 26.79 27.01 27.11 26.93 27.38 27.12 0.25 0.10 0.28 0.00 0.00 0.02 MnO 0.35 0.14 0.03 0.00 0.03 0.00 0.20 0.22 0.22 0.06 0.03 0.10 0.02 0.00 0.00 0.00 0.00 0.00 MgO 2.66 4.27 4.09 0.00 0.00 0.00 2.71 2.67 2.74 4.58 4.66 5.10 0.03 0.00 0.02 0.00 0.00 0.00 CaO 11.41 11.04 10.78 8.69 9.04 8.69 11.14 10.53 10.35 0.00 0.01 0.00 6.17 7.92 7.85 0.13 0.08 0.02 Na2O 1.31 1.55 1.54 6.87 6.39 6.87 1.43 1.31 1.36 0.11 0.10 0.05 7.63 6.62 6.90 1.86 1.94 1.53 K2O 2.07 1.53 1.52 0.21 0.14 0.21 2.07 1.99 2.13 9.85 9.56 9.76 0.95 0.25 0.33 14.89 14.29 15.39 Totals 97.32 96.89 96.16 100.30 99.40 100.30 96.12 96.13 96.18 95.06 94.47 95.80 99.22 100.71 99.17 99.25 99.92 99.64 O 23 23 23 8 8 8 23 23 23 11 11 11 8 8 8 8 8 8 Si 6.19 6.26 6.25 2.56 2.55 2.56 6.17 6.24 6.22 2.77 2.77 2.77 2.65 2.62 2.62 2.98 2.98 2.97 Ti 0.17 0.15 0.16 0.00 0.00 0.00 0.25 0.22 0.23 0.33 0.31 0.32 0.00 0.00 0.00 0.00 0.00 0.00 Al 2.29 2.42 2.40 1.43 1.46 1.43 2.26 2.27 2.26 1.28 1.28 1.28 1.35 1.40 1.37 1.01 1.03 1.02 Cr 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.01 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Fe3+ 0.25 0.16 0.20 0.00 0.02 0.01 0.10 0.21 0.24 0.00 0.00 0.00 0.01 0.00 0.01 0.00 0.00 0.00 Fe2+ 3.41 3.03 3.07 0.00 0.00 0.00 3.54 3.44 3.42 1.81 1.86 1.81 0.00 0.00 0.00 0.00 0.00 0.00 Mn 0.05 0.02 0.00 0.01 0.00 0.00 0.03 0.03 0.03 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 Mg 0.64 1.00 0.97 0.00 0.00 0.00 0.66 0.64 0.66 0.55 0.56 0.61 0.00 0.00 0.00 0.00 0.00 0.00 Ca 1.96 1.86 1.83 0.42 0.44 0.42 1.94 1.82 1.79 0.00 0.00 0.00 0.30 0.37 0.38 0.01 0.00 0.00 Na 0.41 0.47 0.47 0.60 0.56 0.60 0.45 0.41 0.43 0.02 0.00 0.01 0.66 0.56 0.60 0.17 0.17 0.14 K 0.42 0.31 0.31 0.01 0.01 0.01 0.43 0.41 0.44 1.01 0.99 0.99 0.05 0.01 0.02 0.89 0.84 0.91 Totals 15.79 15.69 15.67 5.03 5.01 5.02 15.84 15.71 15.73 7.77 7.78 7.78 5.02 4.97 5.00 5.05 5.02 5.04 XFe/An 0.85 0.76 0.77 40.66 43.52 40.66 0.85 0.85 0.85 0.77 0.77 0.75 29.21 39.20 37.87 XMg 0.15 0.24 0.23 0.15 0.15 0.15 0.23 0.23 0.25 Na+K 0.83 0.78 0.79 0.87 0.81 0.86 AlⅣ 1.81 1.74 1.75 1.83 1.76 1.78 退变质阶段矿物组合 Amp Amp Amp Bt Bt Bt Pl Pl Pl Ilm Ilm Ilm Sph Sph Sph SiO2 39.41 39.46 39.39 34.76 34.98 34.63 54.68 53.74 53.49 0.00 0.00 0.05 30.26 29.95 29.66 TiO2 1.16 1.14 1.37 4.57 4.59 4.96 0.02 0.00 0.00 53.17 53.75 53.90 33.23 34.05 31.93 Al2O3 12.79 13.09 12.82 13.93 13.83 13.43 28.54 29.42 29.61 0.00 0.02 0.00 4.27 3.60 4.46 Cr2O3 0.00 0.04 0.00 0.04 0.00 0.00 0.05 0.02 0.00 0.01 0.02 0.00 0.00 0.00 0.00 FeOT 24.87 25.26 24.61 27.40 26.51 26.78 0.22 0.12 0.19 46.66 43.89 45.98 0.87 1.14 3.55 MnO 0.19 0.21 0.03 0.05 0.11 0.11 0.00 0.01 0.00 0.57 0.43 0.68 0.01 0.06 0.07 MgO 3.70 3.81 4.09 5.10 5.03 5.14 0.00 0.02 0.00 0.00 0.05 0.02 0.04 0.03 0.47 CaO 10.81 11.25 10.78 0.00 0.00 0.00 10.14 11.64 11.59 0.00 0.00 0.00 27.15 26.63 26.18 Na2O 1.39 1.39 1.54 9.72 0.00 9.83 5.47 4.87 5.04 0.06 0.11 0.00 0.01 0.07 0.01 K2O 2.05 1.96 1.52 0.07 9.56 0.09 0.28 0.10 0.05 0.03 0.05 0.02 0.00 0.00 0.06 totals 96.36 97.61 96.16 95.64 94.61 94.97 99.39 99.94 99.96 100.51 98.33 100.65 95.83 95.54 96.39 O 23 23 23 11 11 11 8 8 8 6 6 6 23 23 23 Si 6.28 6.25 6.25 2.77 2.81 2.78 2.48 2.43 2.42 0.00 0.00 0.00 4.85 4.80 4.76 Ti 0.14 0.14 0.16 0.27 0.28 0.30 0.00 0.00 0.00 2.01 2.05 2.02 4.01 4.11 3.85 Al 2.40 2.41 2.40 1.31 1.31 1.27 1.53 1.57 1.58 0.00 0.00 0.00 0.81 0.68 0.84 Cr 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 Fe3+ 0.14 0.18 0.20 0.00 0.00 0.00 0.01 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 Fe2+ 3.17 3.15 3.07 1.83 1.78 1.80 0.00 0.00 0.00 1.96 1.87 1.92 0.12 0.15 0.48 Mn 0.03 0.03 0.00 0.00 0.01 0.01 0.00 0.00 0.00 0.02 0.02 0.03 0.00 0.01 0.01 Mg 0.88 0.89 0.97 0.61 0.60 0.62 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.11 Ca 1.85 1.90 1.83 0.00 0.00 0.00 0.49 0.56 0.56 0.00 0.00 0.00 4.67 4.58 4.50 Na 0.43 0.42 0.47 0.01 0.00 0.01 0.48 0.43 0.44 0.00 0.00 0.00 0.00 0.02 0.00 k 0.42 0.39 0.31 0.99 0.98 1.01 0.02 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 totals 15.73 15.75 15.67 7.80 7.75 7.80 5.00 5.00 5.01 3.99 3.94 3.98 14.47 14.36 14.57 XFe/An 0.79 0.79 0.77 0.75 0.75 0.75 49.76 56.60 55.82 XMg 0.21 0.21 0.23 0.25 0.25 0.25 Na+K 0.85 0.85 0.78 AlⅣ 1.72 1.75 1.75 注：XFe=Fe2+/(Fe2++Mg)；XMg=Mg/(Fe2++Mg)，AlⅣ=8-Si. 
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表 2 石榴角闪二长片麻岩代表性锆石的U-Th-Pb同位素数据
Table 2. U-Th-Pb isotope data for representative zircons from garnet amphibole monzogneiss
测试点 U(10-6) Th(10-6) Th/U 206Pbc(%) 同位素比值 年龄(Ma) 206Pb*/238U ±σ 207Pb*/235U ±σ 207Pb*/206Pb* ±σ 206Pb/238U ±σ 207Pb/206Pb ±σ SC76-1-01 473.312 403.837 0.853 0.051 0.286 0.003 4.447 0.114 0.112 0.003 1 621.016 16.753 1 829.320 47.535 SC76-1-02 1 851.269 32.822 0.018 0.032 0.039 0.000 0.260 0.010 0.048 0.002 247.473 2.784 100.090 87.030 SC76-1-03 1 737.446 1 843.054 1.061 0.050 0.301 0.003 4.717 0.095 0.113 0.002 1 698.593 14.316 1 842.905 37.808 SC76-1-04 242.928 157.350 0.648 0.173 0.240 0.005 4.034 0.212 0.124 0.007 1 385.060 26.239 2 013.885 97.995 SC76-1-05 798.194 12.916 0.016 0.117 0.035 0.001 0.292 0.041 0.060 0.017 222.082 7.595 590.770 526.820 SC76-1-06 439.899 333.362 0.758 0.030 0.260 0.002 3.983 0.089 0.111 0.002 1 488.406 12.106 1 809.260 40.745 SC76-1-07 349.908 7.371 0.021 0.034 0.038 0.001 0.299 0.024 0.058 0.005 240.310 4.218 546.330 185.163 SC76-1-08 1 260.405 848.918 0.674 0.031 0.281 0.003 4.345 0.100 0.111 0.002 1 598.832 14.147 1 820.370 39.505 SC76-1-09 2 322.051 1 635.419 0.704 0.044 0.253 0.003 3.883 0.085 0.111 0.002 1 455.002 13.272 1 810.800 38.890 SC76-1-10 493.559 381.843 0.774 0.048 0.260 0.004 4.025 0.129 0.113 0.004 1 491.123 21.062 1 840.430 59.260 SC76-1-11 202.768 191.003 0.942 0.033 0.311 0.004 4.822 0.143 0.113 0.003 1 746.062 20.492 1 847.840 55.248 SC76-1-12 721.156 656.131 0.910 0.056 0.285 0.005 4.387 0.134 0.115 0.005 1 614.749 23.652 1 887.040 80.868 SC76-1-13 1 649.093 94.415 0.057 0.024 0.061 0.001 0.656 0.023 0.077 0.003 383.173 6.932 1 132.415 64.815 SC76-1-14 269.236 191.885 0.713 0.029 0.279 0.004 4.312 0.121 0.113 0.003 1 585.673 21.786 1 855.560 52.470 SC76-1-15 218.551 170.054 0.778 0.043 0.203 0.004 3.022 0.124 0.108 0.004 1 192.806 21.813 1 769.440 72.530 SC76-1-16 805.486 50.572 0.063 0.030 0.053 0.002 0.530 0.041 0.067 0.004 331.141 12.659 842.590 112.958 SC76-1-17 252.379 176.705 0.700 0.048 0.291 0.008 4.491 0.134 0.113 0.003 1 646.371 37.914 1 847.840 50.000 SC76-1-18 1 931.157 66.691 0.035 0.032 0.038 0.001 0.260 0.010 0.050 0.002 241.432 4.822 176.010 88.875 SC76-1-19 594.382 735.103 1.237 0.029 0.314 0.008 4.861 0.174 0.111 0.003 1 760.150 41.509 1 821.910 48.918 SC76-1-20 899.293 44.608 0.050 0.030 0.037 0.001 0.309 0.018 0.061 0.004 233.458 5.930 653.720 134.240 SC76-1-21 1 713.825 1 017.399 0.594 0.039 0.271 0.005 4.238 0.116 0.113 0.003 1 547.696 24.439 1 842.595 46.760 SC76-1-22 942.858 709.120 0.752 0.038 0.184 0.004 2.692 0.078 0.105 0.003 1 088.436 19.881 1 721.910 47.533 SC76-1-23 284.842 230.108 0.808 0.026 0.299 0.006 4.573 0.142 0.112 0.004 1 684.452 30.826 1 838.890 54.630 SC76-1-24 970.858 1 025.078 1.056 0.026 0.264 0.005 4.053 0.109 0.111 0.002 1 510.828 26.165 1 809.260 39.663 SC76-1-25 1 172.066 35.266 0.030 0.027 0.052 0.001 1.907 0.071 0.262 0.008 329.712 8.280 3260.180 47.223 SC76-1-26 1 409.326 1 041.667 0.739 0.031 0.179 0.004 2.618 0.098 0.106 0.004 1 062.835 19.496 1 736.105 70.838 SC76-1-27 816.858 73.975 0.091 0.022 0.056 0.002 0.554 0.027 0.072 0.003 349.868 11.308 975.930 76.855 SC76-1-28 596.782 446.082 0.747 0.021 0.252 0.005 3.804 0.119 0.109 0.003 1 448.885 27.012 1 790.740 50.773 SC76-1-29 807.796 600.751 0.744 0.023 0.257 0.006 3.920 0.182 0.113 0.006 1 474.269 28.878 1 840.430 100.930 SC76-1-30 557.360 529.190 0.949 0.021 0.297 0.006 4.615 0.276 0.110 0.004 1 673.965 32.084 1 805.555 97.073 SC76-1-31 1 154.345 27.785 0.024 0.022 0.036 0.001 0.273 0.014 0.055 0.003 230.246 4.868 394.495 112.950 SC76-1-32 217.659 163.175 0.750 0.031 0.305 0.007 4.709 0.205 0.112 0.005 1 715.879 34.471 1 828.085 72.995 SC76-1-33 1 082.946 486.786 0.450 0.025 0.234 0.004 3.545 0.118 0.108 0.003 1 355.946 22.127 1 771.915 44.598 SC76-1-34 800.298 568.000 0.710 0.023 0.223 0.005 3.377 0.142 0.108 0.003 1 297.568 24.196 1 768.515 53.550 SC76-1-35 512.429 430.956 0.841 0.014 0.266 0.005 4.077 0.115 0.111 0.003 1 520.178 23.766 1 812.960 43.368 SC76-1-36 1 123.849 582.947 0.519 0.021 0.262 0.005 3.975 0.176 0.109 0.004 1 500.747 24.084 1 784.260 63.735 SC76-1-37 0.854 0.690 0.809 0.751 7.556 2.434 1 021.600 324.296 1.071 0.121 13 838.277 1 834.106 Error error SC76-1-38 1.021 0.496 0.486 0.727 6.053 1.776 480.403 115.580 1.111 0.122 12 592.804 1 623.237 Error error SC76-1-39 1 447.338 926.434 0.640 0.020 0.292 0.005 4.480 0.148 0.113 0.005 1 649.197 25.274 1 854.020 72.223 SC76-1-40 277.872 351.607 1.265 0.018 0.313 0.005 4.853 0.197 0.112 0.005 1 756.825 23.346 1 828.700 74.075 SC76-9-01 678.191 657.752 0.970 0.040 0.279 0.004 4.232 0.108 0.110 0.003 1 586.023 20.034 1 792.280 42.598 SC76-9-02 280.751 191.093 0.681 0.028 0.261 0.004 3.971 0.115 0.110 0.003 1 495.126 19.654 1 811.110 49.850 SC76-9-03 1 008.627 719.871 0.714 0.019 0.294 0.003 4.524 0.100 0.111 0.002 1 663.436 13.455 1 816.665 38.735 SC76-9-04 1 530.015 1 501.375 0.981 0.033 0.312 0.003 4.791 0.087 0.111 0.002 1 752.059 13.814 1 812.960 27.315 SC76-9-05 3 202.009 53.641 0.017 0.023 0.037 0.000 0.269 0.008 0.052 0.002 234.610 2.567 305.615 66.660 SC76-9-06 1 493.557 565.136 0.378 0.020 0.250 0.002 3.750 0.067 0.108 0.002 1 439.517 12.528 1 772.225 33.335 SC76-9-07 836.748 689.979 0.825 0.018 0.265 0.003 4.073 0.082 0.111 0.002 1 516.370 15.749 1 816.665 35.188 SC76-9-08 397.371 344.021 0.866 0.016 0.303 0.003 4.708 0.113 0.112 0.003 1 708.173 16.692 1 831.485 40.740 SC76-9-09 1 599.721 1 126.241 0.704 0.017 0.278 0.003 4.261 0.088 0.111 0.002 1 582.277 14.018 1 809.260 41.668 SC76-9-10 314.060 249.115 0.793 0.019 0.296 0.007 4.572 0.184 0.112 0.004 1 670.568 37.219 1835.190 61.573 SC76-9-11 1 203.673 23.955 0.020 0.020 0.038 0.000 0.307 0.012 0.058 0.002 241.688 2.867 538.925 83.320 SC76-9-12 447.084 302.004 0.675 0.018 0.283 0.004 4.329 0.115 0.111 0.003 1 605.316 18.452 1 809.260 45.683 SC76-9-13 297.405 269.165 0.905 0.014 0.304 0.004 4.686 0.116 0.112 0.003 1 710.898 19.809 1 824.380 40.898 SC76-9-14 1 079.730 10.544 0.010 0.016 0.038 0.000 0.293 0.011 0.056 0.002 242.038 2.698 442.640 92.585 SC76-9-15 424.658 358.546 0.844 0.012 0.281 0.003 4.313 0.110 0.110 0.003 1 597.390 13.558 1 807.100 44.138 SC76-9-16 390.938 332.540 0.851 0.015 0.278 0.004 4.294 0.113 0.112 0.003 1 581.822 21.281 1 827.775 43.055 SC76-9-17 1 076.808 30.633 0.028 0.012 0.038 0.000 0.293 0.012 0.056 0.002 241.787 3.006 455.600 90.733 SC76-9-18 495.090 443.073 0.895 0.017 0.308 0.003 4.730 0.116 0.111 0.003 1 731.131 15.235 1 821.910 78.703 SC76-9-19 934.909 51.948 0.056 0.018 0.037 0.001 0.327 0.021 0.062 0.004 236.442 3.213 687.050 319.428 SC76-9-20 428.248 321.582 0.751 0.028 0.291 0.003 4.465 0.135 0.111 0.003 1 645.001 17.040 1 820.370 53.860 SC76-9-21 1 309.637 590.346 0.451 0.013 0.233 0.003 3.504 0.094 0.109 0.003 1 351.364 13.442 1781.170 50.003 SC76-9-22 710.966 554.426 0.780 0.035 0.289 0.003 4.391 0.122 0.110 0.003 1 634.736 15.338 1 795.990 47.538 SC76-9-23 1 600.779 605.577 0.378 0.020 0.250 0.003 3.733 0.092 0.108 0.003 1 436.333 15.758 1 768.825 44.600 SC76-9-24 211.872 208.217 0.983 0.027 0.310 0.003 4.792 0.136 0.112 0.003 1 741.915 17.087 1 828.085 52.005 SC76-9-25 1 134.168 713.456 0.629 0.019 0.297 0.003 4.599 0.093 0.112 0.002 1 678.898 13.886 1 828.700 37.040 SC76-9-26 870.659 57.315 0.066 0.025 0.040 0.001 0.553 0.030 0.098 0.005 255.772 4.208 1 590.740 86.725 SC76-9-27 770.265 37.977 0.049 0.018 0.037 0.001 0.302 0.016 0.059 0.003 235.965 3.358 568.550 114.798 SC76-9-28 483.755 436.609 0.903 0.014 0.307 0.004 5.510 0.130 0.130 0.003 1 726.777 17.542 2 094.140 73.150 SC76-9-29 1 852.307 1 364.434 0.737 0.018 0.273 0.003 4.188 0.089 0.110 0.002 1 557.117 13.051 1 807.100 37.658 SC76-9-30 604.883 622.934 1.030 0.027 0.284 0.004 4.315 0.125 0.110 0.003 1 612.337 18.463 1 811.110 53.555 SC76-9-31 708.739 106.819 0.151 0.011 0.091 0.004 1.158 0.071 0.089 0.003 558.571 24.599 1 403.390 98.308 SC76-9-32 920.112 495.731 0.539 0.022 0.195 0.003 2.858 0.094 0.107 0.003 1 148.839 17.465 1 742.590 65.585 SC76-9-33 491.475 427.660 0.870 0.033 0.302 0.005 4.626 0.192 0.111 0.004 1 700.525 23.988 1 812.650 67.750 SC76-9-34 525.503 676.186 1.287 0.022 0.322 0.005 4.924 0.125 0.110 0.002 1 800.423 26.543 1 806.480 41.053 SC76-9-35 566.144 550.858 0.973 0.030 0.288 0.005 4.395 0.126 0.111 0.003 1 631.174 23.033 1 816.665 54.475 SC76-9-36 1 431.119 495.411 0.346 0.017 0.260 0.004 3.951 0.092 0.109 0.002 1 492.293 19.608 1 787.040 42.753 SC76-9-37 682.463 623.460 0.914 0.019 0.251 0.005 3.757 0.106 0.109 0.003 1 441.177 27.506 1 775.930 43.365 SC76-9-38 303.307 230.601 0.760 0.015 0.296 0.005 4.527 0.131 0.110 0.003 1 670.064 24.609 1 809.260 49.850 SC76-9-39 803.601 912.716 1.136 0.026 0.299 0.006 4.583 0.158 0.112 0.004 1 684.912 27.831 1 832.410 70.370 SC76-9-40 1 807.060 22.178 0.012 0.011 0.037 0.001 0.264 0.011 0.052 0.002 234.997 5.203 305.615 103.688 注：实验在吉林大学东北亚矿产资源评价国土资源部重点实验室完成，对锆石同时进行了U-Pb年龄和微量元素测试.
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表 3 石榴角闪二长片麻岩主量元素(%)和微量元素(10-6)组成
Table 3. Major (%) and trace element (10-6) compositions of garnet amphibole monzo gneiss
样品号 SC76-1 SC76-3 SC76-6 SC76-8 SC76-9 主量元素(%) SiO2 63.26 64.25 57.37 63.25 65.00 TiO2 1.37 1.16 2.46 1.27 1.05 Al2O3 13.49 13.64 12.04 13.33 13.67 FeOT 8.79 7.57 14.62 8.11 7.17 MnO 0.11 0.09 0.17 0.09 0.09 MgO 0.80 0.75 1.41 0.76 0.59 CaO 3.86 3.57 6.35 3.56 3.60 Na2O 1.68 1.83 1.13 1.80 1.76 K2O 4.81 5.39 2.98 5.08 5.74 P2O5 0.45 0.40 0.79 0.42 0.35 H2O+ 1.48 1.20 1.02 1.70 0.96 CO2 0.00 0.00 0.00 0.42 0.10 Total 100.12 99.85 100.35 99.78 100.08 FeOT/(FeOT+Mg) 0.92 0.91 0.91 0.91 0.92 A/CNK 0.91 0.90 0.73 0.90 0.88 A/NK 1.71 1.56 2.40 1.59 1.52 微量元素(10-6) Rb 171.00 144.20 163.10 174.70 166.00 Ba 1126.26 1101.41 650.84 1064.22 1276.89 Th 30.08 26.33 34.57 35.19 22.87 U 4.79 4.32 5.34 4.91 3.64 Ta 4.33 3.69 7.24 3.58 3.41 Nb 63.90 53.36 109.60 51.92 49.49 Ga 27.85 27.58 28.67 27.67 24.33 La 146.92 98.40 357.87 162.52 123.72 Ce 324.93 220.50 524.51 362.78 278.62 Sr 221.30 234.90 102.00 193.30 296.20 Nd 146.90 112.40 285.20 137.80 107.60 P 4547.62 4049.60 7868.27 4169.26 3470.20 Zr 634.91 575.58 924.17 615.26 657.00 Hf 12.74 12.13 18.65 12.50 13.33 Y 98.37 64.33 159.88 84.43 83.17 La 146.92 98.40 357.87 162.52 123.72 Ce 324.93 220.50 524.51 362.78 278.62 Pr 30.55 26.61 69.12 26.56 33.31 Nd 146.06 96.77 272.40 144.09 120.94 Sm 28.75 19.76 49.42 27.78 23.91 Eu 3.50 2.58 3.95 3.39 3.32 Gd 27.94 19.14 47.98 26.48 23.43 Tb 4.17 2.68 6.79 3.80 3.46 Dy 23.19 15.57 36.64 20.89 19.50 Ho 4.46 2.94 7.20 3.92 3.72 Er 12.93 8.72 20.71 10.98 10.83 Tm 1.81 1.22 2.91 1.58 1.57 Yb 11.71 7.66 18.59 10.33 9.84 Lu 1.75 1.15 2.70 1.42 1.48 Y 98.37 64.33 159.88 84.43 83.17 LaN/YbN 9.00 9.21 13.81 11.29 9.01 δEu 0.37 0.40 0.25 0.38 0.42 δCe 1.13 1.04 0.77 1.23 1.04 104 Ga/Al 3.90 3.82 4.50 3.92 3.36 Zr+Nb+Ce+Y 1122.12 913.77 1718.16 1114.39 1068.28 ∑REE 768.65 523.69 1420.79 806.52 657.66 注：A/CNK=Al2O3/(CaO+Na2O+K2O)，A/NK=Al2O3/(Na2O+K2O)，分子比；∑REE为稀土元素总量.
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