Mineralogy and Mineral Chemistry of the Luojiashan Gabbro in the Yingyangguan Area of Northeastern Guangxi and Its Tectonic Significance
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摘要: 对桂东北鹰扬关地区新发现的罗家山辉长岩开展年代学、矿物学和矿物化学研究，可进一步约束区域构造背景.罗家山辉长岩的主要矿物为单斜辉石（Cpx）和斜长石（Pl）.单斜辉石具有高铁铝、低钙钠钛的特征，其成分为Wo27~31En36~47Fs21~32，属于普通辉石；斜长石具有高硅铝钠、低钙钾的特点，其成分为An0~3Ab96~100Or0~2，属于钠长石.根据单斜辉石的化学成分判定罗家山辉长岩的母岩浆属于Si不饱和的亚碱性拉斑玄武岩系列.单斜辉石温压估算结果表明，罗家山辉长岩的形成温度介于1 282~1 292 ℃，平均值1 287 ℃；形成压力介于1.53~2.37 GPa，平均值2.02 GPa；对应深度介于50.49~78.21 km，平均值66.80 km. LA-ICP-MS锆石U-Pb年龄表明罗家山辉长岩形成于（768.9±6.8）Ma.单斜辉石的化学成分特征表明罗家山辉长岩属于典型的板内拉斑玄武岩.结合区域构造演化特征，推断罗家山辉长岩起源于地幔物质上涌、岩石圈减薄的伸展裂谷构造背景.Abstract: In this paper, the geochronology, mineralogy and mineral chemistry of Luojiashan gabbro in Yingyangguan area of northeastern Guangxi were studied, to constrain the regional tectonic background. The main mineral compositions of Luojiashan gabbro are clinopyroxene (Cpx) and plagioclase (Pl). The clinopyroxene of Luojiashan gabbro is characterized by high Fe, Al, and low Ca, Na, Ti, and its composition is Wo27-31En36-47Fs21-32, which belongs to augite. Plagioclase is characterized by high Si, Al, Na, and low Ca, K, and its composition is An0-3Ab96-100Or0-2, which belongs to albite. According to the chemical composition of clinopyroxene, the parental magma of the Luojiashan gabbro should belong to tholeiitic series. The crystallization temperature and pressure of clinopyroxene were estimated by the clinopyroxene-melt equilibrium and clinopyroxene isotherm, which yielded crystallization temperature of 1 282-1 292 ℃, with an average of 1 287 ℃. The pressures are 1.53-2.37 GPa, with an average of 2.02 GPa, and corresponding to a formation depth of 50.49-78.21 km, with an average of 66.80 km. The Luojiashan gabbro was formed at (768.9±6.8) Ma based on LA-ICP-MS zircon U-Pb dating. The chemical composition of clinopyroxene indicates that Luojiashan gabbro is a typical intraplate tholeiite. Combined with the characteristics of regional tectonic evolution, it is inferred that the Luojiashan gabbro in northeastern Guangxi originated from the extensional rift tectonic background of lithosphere thinning and mantle upwelling.
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图 1 研究区地质简图
a修改自周雪瑶等（2015）；b和c修改自广西壮族自治区区域地质调查研究院，2005，贺州幅1∶25万区域地质调查报告. 1.白垩系；2.泥盆系；3.寒武系；4.震旦系培地组；5.南华系正圆岭组；6.南华系天子地组；7.上元古界下龙组；8.上元古界鹰扬关组；9.侏罗纪二长花岗岩；10.侏罗纪花岗闪长岩；11.三叠纪花岗闪长岩；12.志留纪花岗闪长岩；13.志留纪二长花岗岩；14.镁铁质岩石；15.断层；16.不整合接触界线；17.地质界线；18.省界；19.采样位置；20.村镇
Fig. 1. Skecth map of research area
图 2 罗家山辉长岩的野外地质照片(a)、手标本照片(b)、显微照片(c~g)和背散射照片(h~i)
Pl.斜长石；Cpx.单斜辉石；Chl.绿泥石；Cb.碳酸盐矿物；Pt3y.鹰扬关组；Gabbro.罗家山辉长岩
Fig. 2. The field geological photo (a), hand specimen photo (b), photomicrograph (c‒g) and BSE images (h‒i) of Luojiashan gabbro
图 3 罗家山辉长岩单斜辉石Q-J图解（a）和分类图解（b）
Wo.硅灰石；En.顽火辉石；Fs.铁辉石；Di.透辉石；He.钙铁辉石；Au.普通辉石；Pi.易变辉石；ClEn.斜顽辉石；ClFs.斜铁辉石. 底图据Morimoto et al.（1988）
Fig. 3. Diagrams of Q-J series (a) and classification (b) for clinopyroxenes from Luojiashan gabbro
图 4 单斜辉石主要氧化物对Mg#值相关性图解
Fig. 4. Correlation diagrams between major oxides and Mg# in clinopyoxene
图 5 罗家山辉长岩斜长石An-Ab-Or分类图解
Fig. 5. Classification of feldspar from Luojiashan gabbro
图 6 罗家山辉长岩的锆石阴极发光图像（a）和U-Pb年龄谐和图解（b）
Fig. 6. The zircons CL images (a) and U-Pb age concordia diagram (b) for Luojiashan gabbro
图 8 单斜辉石的成分等温线图解（底图据Lindsley, 1983）
Fig. 8. The plot for pyroxene showing the equilibrium temperature (after Lindseley, 1983)
图 9 罗家山辉长岩单斜辉石F1-F2图解（a）和单斜辉石Ti-(Ca+Na)图解（b）
图a底图据Nisbet and Pearce（1977）；图b底图据Leterrier et al.（1982）. WPT.板内拉斑玄武岩；WPA.板内碱性玄武岩；VAB.火山弧玄武岩；OFB.洋底玄武岩；F1=‒0.012 0×SiO2‒0.080 7×TiO2+0.002 6×Al2O3‒0.001 2×FeOT‒0.002 6×MnO+0.008 7×MgO‒0.012 8×CaO‒0.041 9×Na2O；F2=‒0.046 9×SiO2‒0.081 8×TiO2‒0.021 2×Al2O3‒0.004 1×FeOT‒0.143 5×MnO‒0.002 9×MgO+0.008 5×CaO+0.016 0×Na2O
Fig. 9. F1-F2 diagram (a) and Ti-(Ca+Na) diagram (b) of clinopyroxene from Luojiashan gabbro
表 1 罗家山辉长岩中单斜辉石成分电子探针成分分析结果（%）
Table 1. Chemical composition (%) of clinopyroxene in the Luojiashan gabbro
Spot No. LJS-1 LJS-2 LJS-3 LJS-4 LJS-5 LJS-6 LJS-7 LJS-8 LJS-9 LJS-10 LJS-11 LJS-12 LJS-13 LJS-14 LJS-15 SiO2 52.50 53.21 53.16 53.15 51.32 49.91 49.87 50.31 49.74 48.14 48.46 49.34 49.65 49.02 51.34 TiO2 0.22 0.21 0.22 0.22 0.14 0.14 0.09 0.16 0.11 0.63 0.63 0.15 0.18 0.15 0.06 Al2O3 2.65 2.72 2.84 2.74 5.01 5.98 6.43 5.73 5.86 7.00 7.19 5.80 6.70 6.96 3.30 Cr2O3 0.05 0.00 0.00 0.00 0.02 0.00 0.00 0.01 0.00 0.02 0.05 0.05 0.00 0.01 0.20 FeO* 13.10 12.30 13.16 13.18 12.41 13.23 12.36 12.80 13.24 14.14 14.69 13.33 12.72 12.82 16.18 MnO 0.29 0.35 0.36 0.36 0.29 0.25 0.24 0.23 0.23 0.26 0.30 0.27 0.24 0.21 0.37 MgO 14.79 14.86 14.74 14.74 14.69 13.99 14.17 14.23 13.86 12.79 13.11 13.30 14.08 13.81 12.27 CaO 12.84 12.83 13.03 13.04 13.15 13.31 13.02 13.02 13.11 12.86 12.84 13.01 12.69 12.75 12.57 Na2O 0.24 0.37 0.37 0.35 0.64 0.80 0.89 0.72 0.76 0.74 0.83 0.67 0.85 0.99 0.35 K2O 0.05 0.04 0.02 0.02 0.06 0.09 0.09 0.09 0.09 0.12 0.11 0.08 0.10 0.11 0.10 P2O5 0.03 0.00 0.01 0.01 0.00 0.03 0.01 0.00 0.00 0.04 0.00 0.03 0.05 0.04 0.00 NiO 0.02 0.05 0.01 0.01 0.00 0.00 0.00 0.02 0.00 0.04 0.00 0.00 0.07 0.02 0.00 Total 96.76 96.95 97.93 97.82 97.74 97.74 97.17 97.31 97.00 96.78 98.21 96.04 97.32 96.91 96.75 Si 2.002 2.015 2.002 2.004 1.936 1.897 1.896 1.913 1.904 1.860 1.848 1.909 1.889 1.876 1.989 Al(ⅳ) 0.000 0.000 0.000 0.000 0.064 0.103 0.104 0.087 0.097 0.140 0.152 0.091 0.111 0.124 0.011 Al(ⅵ) 0.119 0.121 0.126 0.122 0.159 0.165 0.185 0.170 0.168 0.179 0.171 0.174 0.189 0.190 0.140 Ti 0.006 0.006 0.006 0.006 0.004 0.004 0.003 0.004 0.003 0.018 0.018 0.004 0.005 0.004 0.002 Cr 0.002 0.000 0.000 0.000 0.001 0.000 0.000 0.000 0.000 0.001 0.001 0.002 0.000 0.000 0.006 Fe3+ 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.015 0.000 0.000 0.006 0.000 Fe2+ 0.424 0.396 0.421 0.422 0.394 0.421 0.394 0.409 0.425 0.458 0.453 0.433 0.406 0.404 0.531 Mn 0.010 0.011 0.012 0.012 0.009 0.008 0.008 0.007 0.008 0.009 0.010 0.009 0.008 0.007 0.012 Mg 0.841 0.839 0.828 0.829 0.826 0.793 0.803 0.806 0.791 0.736 0.745 0.767 0.799 0.788 0.709 Ca 0.525 0.521 0.526 0.527 0.532 0.542 0.530 0.530 0.538 0.532 0.524 0.540 0.517 0.523 0.522 Na 0.017 0.028 0.027 0.026 0.047 0.059 0.066 0.053 0.056 0.055 0.061 0.051 0.063 0.074 0.027 K 0.003 0.002 0.001 0.001 0.003 0.004 0.004 0.004 0.004 0.006 0.005 0.004 0.005 0.006 0.005 Wo 28.88 29.02 29.01 29.03 29.40 29.74 29.45 29.37 29.59 29.73 29.00 29.98 28.87 29.02 28.98 En 46.30 46.76 45.66 45.68 45.69 43.47 44.60 44.64 43.53 41.13 41.21 42.65 44.57 43.74 39.37 Fs 23.86 22.69 23.84 23.88 22.32 23.54 22.30 23.04 23.80 26.05 26.40 24.57 23.06 23.15 30.18 Ac 0.96 1.53 1.50 1.41 2.59 3.25 3.66 2.95 3.08 3.10 3.40 2.81 3.50 4.09 1.47 Mg# 66.48 67.93 66.31 66.28 67.69 65.30 67.10 66.36 65.05 61.66 62.22 63.91 66.32 66.12 57.16 Cr# 1.25 0.08 0.00 0.00 0.27 0.04 0.00 0.08 0.00 0.19 0.43 0.60 0.00 0.13 3.95 Spot No. LJS-16 LJS-17 LJS-18 LJS-19 LJS-20 LJS-21 LJS-22 LJS-23 LJS-24 LJS-25 LJS-26 LJS-27 LJS-28 LJS-29 LJS-30 SiO2 50.79 51.16 51.42 51.71 52.00 50.65 49.26 49.21 49.78 49.46 49.42 50.58 51.52 49.51 49.06 TiO2 0.15 0.14 0.08 0.03 0.05 0.67 0.10 0.12 0.16 0.50 0.47 0.12 0.05 0.13 0.10 Al2O3 5.56 4.22 3.73 3.67 2.84 4.40 6.67 6.83 6.57 5.76 4.90 4.31 3.46 5.31 5.55 Cr2O3 0.12 0.12 0.10 0.15 0.18 0.17 0.18 0.15 0.12 0.07 0.14 0.09 0.09 0.07 0.03 FeO* 12.97 13.20 16.19 16.67 15.78 14.96 12.51 12.51 11.59 12.52 13.79 16.89 16.07 16.62 16.57 MnO 0.33 0.33 0.35 0.32 0.33 0.30 0.24 0.29 0.27 0.29 0.29 0.38 0.29 0.32 0.35 MgO 14.12 15.11 12.30 12.65 12.90 12.79 14.12 13.94 14.59 14.81 13.28 11.85 12.58 11.59 11.28 CaO 12.96 12.48 12.93 12.61 12.83 12.95 13.06 13.02 12.98 13.14 13.02 12.37 13.15 12.62 12.84 Na2O 0.66 0.47 0.48 0.46 0.35 0.51 0.85 0.80 0.77 0.68 0.65 0.55 0.48 0.60 0.64 K2O 0.08 0.09 0.08 0.11 0.08 0.12 0.08 0.10 0.09 0.09 0.10 0.10 0.08 0.13 0.15 P2O5 0.00 0.00 0.00 0.01 0.02 0.02 0.02 0.00 0.01 0.00 0.01 0.00 0.05 0.01 0.00 NiO 0.07 0.00 0.02 0.04 0.08 0.02 0.07 0.03 0.02 0.04 0.03 0.00 0.04 0.02 0.02 Total 97.80 97.30 97.69 98.42 97.42 97.55 97.16 97.00 96.94 97.36 96.12 97.24 97.85 96.92 96.58 Si 1.922 1.945 1.975 1.973 1.998 1.941 1.879 1.879 1.891 1.884 1.918 1.957 1.977 1.925 1.917 Al(ⅳ) 0.078 0.055 0.025 0.027 0.002 0.059 0.121 0.121 0.109 0.116 0.082 0.043 0.023 0.075 0.083 Al(ⅵ) 0.170 0.134 0.144 0.138 0.127 0.140 0.179 0.187 0.186 0.142 0.142 0.154 0.133 0.168 0.173 Ti 0.004 0.004 0.002 0.001 0.001 0.019 0.003 0.004 0.006 0.014 0.014 0.004 0.001 0.004 0.003 Cr 0.004 0.004 0.003 0.005 0.005 0.005 0.006 0.005 0.004 0.002 0.004 0.003 0.003 0.002 0.001 Fe3+ 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Fe2+ 0.413 0.422 0.526 0.537 0.514 0.484 0.399 0.400 0.370 0.399 0.450 0.552 0.521 0.544 0.544 Mn 0.010 0.011 0.011 0.010 0.011 0.010 0.008 0.009 0.009 0.009 0.010 0.013 0.010 0.011 0.012 Mg 0.797 0.856 0.704 0.720 0.739 0.731 0.803 0.793 0.826 0.841 0.768 0.684 0.719 0.672 0.657 Ca 0.526 0.508 0.532 0.516 0.528 0.532 0.534 0.533 0.528 0.536 0.542 0.513 0.541 0.526 0.537 Na 0.049 0.034 0.036 0.034 0.026 0.038 0.063 0.059 0.057 0.050 0.049 0.042 0.036 0.046 0.049 K 0.004 0.005 0.004 0.006 0.004 0.006 0.004 0.005 0.004 0.004 0.005 0.005 0.004 0.007 0.008 Wo 29.28 27.75 29.41 28.38 29.06 29.62 29.54 29.68 29.52 29.21 29.78 28.46 29.60 29.25 29.88 En 44.40 46.74 38.93 39.60 40.67 40.72 44.44 44.20 46.18 45.82 42.26 37.92 39.39 37.37 36.54 Fs 23.61 23.63 29.69 30.15 28.85 27.53 22.53 22.82 21.13 22.23 25.26 31.31 29.04 30.84 30.89 Ac 2.71 1.88 1.97 1.87 1.42 2.12 3.49 3.30 3.18 2.74 2.70 2.31 1.97 2.53 2.70 Mg# 65.85 66.97 57.26 57.25 59.00 60.14 66.79 66.47 69.10 67.84 63.08 55.33 58.01 55.27 54.71 Cr# 1.43 1.87 1.80 2.71 3.96 2.50 1.80 1.47 1.18 0.84 1.88 1.35 1.70 0.82 0.31 Spot No. LJS-31 LJS-32 LJS-33 LJS-34 LJS-35 LJS-36 LJS-37 LJS-38 LJS-39 LJS-40 LJS-41 LJS-42 LJS-43 LJS-44 LJS-45 SiO2 49.06 50.49 49.65 50.58 50.07 52.19 51.69 51.82 51.40 51.22 52.02 51.68 49.74 50.81 51.13 TiO2 0.12 0.10 0.12 0.13 0.07 0.09 0.02 0.04 0.08 0.43 0.09 0.09 0.14 0.05 0.06 Al2O3 5.47 4.68 5.77 4.96 4.04 3.48 3.60 3.57 3.47 3.17 3.59 3.94 5.34 3.82 3.83 Cr2O3 0.18 0.14 0.14 0.00 0.07 0.06 0.08 0.13 0.05 0.06 0.07 0.03 0.04 0.04 0.10 FeO* 17.01 15.33 15.97 12.85 16.79 15.18 15.69 15.02 15.46 15.28 15.05 15.43 13.92 15.54 15.96 MnO 0.30 0.32 0.31 0.23 0.35 0.28 0.35 0.33 0.27 0.29 0.29 0.34 0.30 0.28 0.35 MgO 11.64 12.68 12.34 14.15 11.95 13.54 12.91 13.17 13.02 12.96 13.07 12.88 13.26 12.65 12.47 CaO 12.66 12.85 12.97 12.99 12.66 12.93 13.19 13.02 12.86 13.29 12.89 12.79 13.07 13.10 12.72 Na2O 0.61 0.59 0.73 0.74 0.58 0.42 0.46 0.41 0.49 0.36 0.40 0.50 0.64 0.41 0.47 K2O 0.14 0.12 0.13 0.09 0.11 0.09 0.09 0.09 0.09 0.07 0.09 0.10 0.14 0.09 0.08 P2O5 0.00 0.00 0.00 0.00 0.02 0.02 0.00 0.01 0.00 0.00 0.04 0.02 0.02 0.01 0.00 NiO 0.00 0.09 0.02 0.01 0.00 0.00 0.00 0.03 0.06 0.05 0.08 0.01 0.02 0.00 0.06 Total 97.17 97.37 98.13 96.72 96.70 98.28 98.09 97.63 97.24 97.18 97.67 97.8 96.61 96.79 97.23 Si 1.908 1.942 1.903 1.935 1.953 1.980 1.973 1.980 1.977 1.973 1.986 1.973 1.919 1.966 1.972 Al(ⅳ) 0.092 0.058 0.097 0.065 0.047 0.020 0.027 0.020 0.023 0.027 0.014 0.027 0.081 0.034 0.028 Al(ⅵ) 0.159 0.154 0.164 0.159 0.139 0.135 0.135 0.141 0.135 0.117 0.147 0.151 0.162 0.140 0.146 Ti 0.003 0.003 0.003 0.004 0.002 0.003 0.001 0.001 0.002 0.013 0.003 0.003 0.004 0.001 0.002 Cr 0.006 0.004 0.004 0.000 0.002 0.002 0.002 0.004 0.001 0.002 0.002 0.001 0.001 0.001 0.003 Fe3+ 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 Fe2+ 0.555 0.497 0.513 0.413 0.551 0.487 0.506 0.486 0.502 0.498 0.487 0.498 0.451 0.508 0.520 Mn 0.010 0.010 0.010 0.008 0.012 0.009 0.011 0.011 0.009 0.010 0.009 0.011 0.010 0.009 0.012 Mg 0.675 0.727 0.705 0.807 0.695 0.766 0.735 0.750 0.746 0.745 0.744 0.733 0.763 0.730 0.717 Ca 0.528 0.530 0.533 0.532 0.529 0.526 0.540 0.533 0.530 0.549 0.527 0.523 0.540 0.543 0.526 Na 0.046 0.044 0.054 0.055 0.044 0.031 0.034 0.031 0.036 0.027 0.030 0.037 0.048 0.031 0.035 K 0.007 0.006 0.006 0.004 0.005 0.004 0.005 0.004 0.004 0.003 0.004 0.005 0.007 0.004 0.004 Wo 29.11 29.30 29.35 29.33 28.90 28.92 29.56 29.46 29.06 30.02 29.34 29.02 29.82 29.85 29.05 En 37.21 40.22 38.86 44.45 37.97 42.12 40.25 41.44 40.93 40.74 41.38 40.67 42.10 40.08 39.62 Fs 31.17 28.05 28.82 23.18 30.73 27.26 28.32 27.42 28.02 27.76 27.62 28.25 25.45 28.39 29.39 Ac 2.52 2.44 2.97 3.04 2.40 1.70 1.87 1.69 1.98 1.48 1.66 2.05 2.62 1.68 1.94 Mg# 54.85 59.41 57.89 66.13 55.78 61.14 59.23 60.70 59.78 59.93 60.43 59.54 62.83 58.96 57.95 Cr# 2.15 1.99 1.59 0.00 1.12 1.08 1.46 2.31 0.88 1.17 1.28 0.50 0.53 0.68 1.75 注：阳离子数的计算以6个氧原子数为基准；Mg#=100×Mg/(Mg+Fe2+)，Cr#=100×Cr/(Cr+Al)，Wo=100×Ca/(Ca+Mg+Fe2+)，En=100×Mg/(Ca+Mg+Fe2+)，Fs=100×Fe2+/(Ca+Mg+Fe2+). 
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表 2 罗家山辉长岩中斜长石电子探针成分分析结果（%）
Table 2. Chemical composition (%) of plagioclase in the Luojiashan gabbro
Spot No. LJS-1 LJS-2 LJS-3 LJS-4 LJS-5 LJS-6 LJS-7 LJS-8 LJS-9 LJS-10 LJS-11 LJS-12 LJS-13 LJS-14 LJS-15 LJS-16 SiO2 67.84 67.74 67.89 69.40 67.39 68.24 68.59 67.87 68.87 67.88 68.11 68.81 68.39 67.82 67.30 67.62 TiO2 0.00 0.03 0.00 0.00 0.00 0.04 0.00 0.00 0.02 0.00 0.02 0.00 0.00 0.00 0.00 0.01 Al2O3 19.37 19.74 19.36 20.29 19.53 19.64 19.61 19.25 20.24 19.40 19.26 20.18 19.85 18.79 18.96 19.60 Cr2O3 0.00 0.00 0.00 0.03 0.01 0.01 0.02 0.00 0.00 0.01 0.03 0.01 0.00 0.00 0.00 0.00 FeO* 0.06 0.04 0.00 0.07 0.08 0.00 0.01 0.09 0.07 0.05 0.02 0.06 0.10 0.03 0.09 0.06 MnO 0.01 0.02 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.04 0.00 0.00 0.01 0.00 MgO 0.00 0.00 0.00 0.00 0.03 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.02 0.00 0.01 0.01 CaO 0.13 0.07 0.19 0.07 0.11 0.07 0.10 0.12 0.08 0.14 0.14 0.19 0.08 0.13 0.11 0.23 Na2O 12.53 12.60 12.50 12.81 12.23 12.31 12.54 12.25 12.21 12.12 12.50 12.26 12.69 12.32 12.37 12.33 K2O 0.05 0.05 0.07 0.05 0.15 0.04 0.07 0.05 0.05 0.07 0.04 0.07 0.06 0.06 0.05 0.06 P2O5 0.00 0.00 0.03 0.00 0.03 0.00 0.00 0.06 0.00 0.01 0.00 0.00 0.01 0.00 0.01 0.00 NiO 0.00 0.00 0.00 0.00 0.03 0.00 0.00 0.02 0.01 0.04 0.02 0.00 0.00 0.00 0.00 0.03 Total 99.99 100.28 100.04 102.73 99.58 100.35 100.94 99.74 101.56 99.72 100.16 101.62 101.20 99.16 98.90 99.95 Si 2.978 2.966 2.978 2.966 2.973 2.979 2.979 2.986 2.970 2.984 2.985 2.969 2.969 2.998 2.987 2.970 Al 1.002 1.019 1.001 1.022 1.015 1.011 1.004 0.998 1.029 1.005 0.995 1.026 1.015 0.979 0.992 1.015 Ca 0.006 0.003 0.009 0.003 0.005 0.003 0.005 0.006 0.004 0.007 0.007 0.009 0.004 0.006 0.005 0.011 Na 1.066 1.070 1.063 1.062 1.046 1.042 1.056 1.045 1.021 1.033 1.062 1.025 1.068 1.056 1.064 1.050 K 0.003 0.003 0.004 0.003 0.009 0.002 0.004 0.003 0.003 0.004 0.002 0.004 0.003 0.003 0.003 0.003 An 0.58 0.31 0.83 0.30 0.47 0.32 0.45 0.55 0.37 0.63 0.62 0.83 0.35 0.59 0.48 1.02 Ab 99.16 99.43 98.81 99.44 98.73 99.48 99.16 99.19 99.38 99.01 99.18 98.80 99.34 99.12 99.27 98.66 Or 0.26 0.26 0.36 0.27 0.80 0.21 0.39 0.26 0.25 0.37 0.19 0.37 0.30 0.29 0.25 0.32 Spot No. LJS-17 LJS-18 LJS-19 LJS-20 LJS-21 LJS-22 LJS-23 LJS-24 LJS-25 LJS-26 LJS-27 LJS-28 LJS-29 LJS-30 LJS-31 LJS-32 SiO2 66.84 66.06 68.26 67.56 67.89 67.94 67.43 68 70.38 65.93 68.15 68 67.92 67.08 68.01 67.84 TiO2 0.00 0.00 0.00 0.00 0.06 0.00 0.02 0.02 0.02 0.00 0.01 0.00 0.04 0.00 0.01 0.52 Al2O3 19.16 18.68 19.65 19.07 19.83 20.17 19.77 19.47 20.67 19.35 19.99 19.98 19.86 19.58 19.69 19.83 Cr2O3 0.00 0.00 0.00 0.00 0.02 0.00 0.00 0.00 0.02 0.00 0.00 0.00 0.02 0.00 0.00 0.00 FeO* 0.09 0.09 0.06 0.09 0.03 0.08 0.07 0.01 0.12 0.68 0.06 0.10 0.01 0.02 0.09 0.16 MnO 0.00 0.00 0.00 0.00 0.00 0.01 0.01 0.02 0.00 0.02 0.00 0.00 0.01 0.00 0.00 0.00 MgO 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 0.46 0.00 0.01 0.00 0.02 0.04 0.04 CaO 0.13 0.22 0.05 0.19 0.07 0.26 0.17 0.07 0.22 0.19 0.22 0.17 0.20 0.30 0.14 0.53 Na2O 12.21 11.62 12.28 12.43 12.45 11.71 12.29 12.51 7.34 11.35 11.09 12.40 12.14 11.48 12.34 12.40 K2O 0.12 0.13 0.08 0.06 0.09 0.09 0.09 0.09 0.06 0.07 0.10 0.08 0.07 0.13 0.07 0.06 P2O5 0.01 0.03 0.00 0.00 0.04 0.00 0.00 0.00 0.00 0.03 0.00 0.01 0.01 0.00 0.00 0.02 NiO 0.00 0.02 0.00 0.04 0.00 0.04 0.02 0.00 0.03 0.01 0.02 0.00 0.04 0.00 0.00 0.02 Total 98.58 96.83 100.39 99.45 100.48 100.29 99.88 100.19 98.87 98.08 99.63 100.76 100.30 98.61 100.4 101.42 Si 2.977 2.990 2.980 2.984 2.967 2.966 2.965 2.978 3.048 2.975 2.984 2.963 2.970 2.976 2.973 2.960 Al 1.006 0.997 1.011 0.992 1.021 1.038 1.024 1.005 1.055 1.029 1.032 1.026 1.023 1.024 1.014 1.020 Ca 0.006 0.011 0.003 0.009 0.003 0.012 0.008 0.004 0.010 0.009 0.011 0.008 0.009 0.014 0.007 0.025 Na 1.055 1.019 1.039 1.065 1.055 0.991 1.048 1.062 0.616 0.993 0.942 1.048 1.029 0.988 1.046 1.049 K 0.007 0.007 0.005 0.003 0.005 0.005 0.005 0.005 0.003 0.004 0.005 0.004 0.004 0.007 0.004 0.003 An 0.60 1.03 0.24 0.83 0.32 1.20 0.73 0.32 1.64 0.93 1.08 0.75 0.89 1.41 0.62 2.29 Ab 98.76 98.26 99.33 98.87 99.19 98.32 98.81 99.23 97.81 98.67 98.35 98.84 98.75 97.88 98.99 97.41 Or 0.64 0.71 0.43 0.30 0.49 0.48 0.46 0.44 0.54 0.39 0.57 0.41 0.36 0.71 0.39 0.30 Spot No. LJS-33 LJS-34 LJS-35 LJS-36 LJS-37 LJS-38 LJS-39 LJS-40 LJS-41 LJS-42 LJS-43 LJS-44 LJS-45 LJS-46 LJS-47 LJS-48 SiO2 67.90 66.02 67.10 67.82 66.69 65.28 67.85 68.15 67.42 68.37 68.50 64.41 65.13 66.85 66.59 67.12 TiO2 0.00 0.04 0.01 0.00 0.02 0.00 0.00 0.01 0.01 0.02 0.00 0.04 0.01 0.00 0.00 0.00 Al2O3 19.50 19.10 19.89 19.7 19.70 19.67 19.72 19.82 19.41 20.85 21.16 18.67 19.19 20.23 20.63 20.67 Cr2O3 0.00 0.00 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.01 0.00 0.03 0.01 0.01 0.01 0.00 FeO 0.09 0.12 0.42 0.16 0.55 1.11 0.04 0.13 0.05 0.49 0.37 0.15 0.12 0.32 0.51 0.40 MnO 0.00 0.02 0.00 0.00 0.05 0.03 0.03 0.00 0.01 0.01 0.02 0.00 0.00 0.00 0.01 0.00 MgO 0.01 0.00 0.51 0.06 0.45 0.87 0.00 0.00 0.00 0.33 0.23 0.01 0.03 0.12 0.25 0.27 CaO 0.07 0.08 0.29 0.22 0.28 0.35 0.41 0.27 0.17 0.25 0.29 0.23 0.10 0.31 0.22 0.27 Na2O 12.26 11.87 11.85 12.30 12.01 11.23 12.34 12.28 12.27 7.22 6.79 12.14 12.18 12.07 11.00 8.20 K2O 0.07 0.17 0.08 0.09 0.07 0.09 0.11 0.09 0.09 0.09 0.08 0.11 0.22 0.08 0.09 0.09 P2O5 0.02 0.01 0.12 0.00 0.00 0.01 0.00 0.03 0.01 0.00 0.02 0.07 0.04 0.03 0.00 0.00 NiO 0.00 0.02 0.00 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.08 0.02 0.03 0.01 0.00 0.00 Total 99.92 97.43 100.25 100.36 99.81 98.64 100.51 100.77 99.45 97.64 97.54 95.87 97.04 100.01 99.31 97.01 Si 2.980 2.976 2.962 2.970 2.961 2.956 2.966 2.970 2.975 3.023 3.022 2.963 2.956 2.946 2.949 2.999 Al 1.009 1.014 1.035 1.017 1.031 1.050 1.016 1.018 1.010 1.087 1.100 1.012 1.027 1.051 1.077 1.088 Ca 0.003 0.004 0.014 0.010 0.013 0.017 0.019 0.013 0.008 0.012 0.014 0.011 0.005 0.014 0.011 0.013 Na 1.043 1.037 1.014 1.044 1.034 0.986 1.046 1.037 1.050 0.619 0.581 1.083 1.072 1.031 0.945 0.710 K 0.004 0.010 0.005 0.005 0.004 0.005 0.006 0.005 0.005 0.005 0.005 0.006 0.013 0.005 0.005 0.005 An 0.31 0.34 1.31 0.96 1.28 1.69 1.78 1.19 0.77 1.86 2.30 1.03 0.43 1.38 1.11 1.79 Ab 99.31 98.74 98.23 98.57 98.37 97.8 97.63 98.32 98.75 97.30 96.94 98.39 98.40 98.17 98.35 97.51 Or 0.37 0.91 0.45 0.47 0.35 0.50 0.58 0.49 0.48 0.83 0.76 0.58 1.17 0.45 0.54 0.70
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表 3 罗家山辉长岩的LA⁃ICP⁃MS锆石U⁃Pb测年数据
Table 3. The datas of LA⁃ICP⁃MS zircon U⁃Pb dating for Luojiashan gabbro
点号 (10‒6) Th/U 比值 年龄(Ma) Th U 207Pb/206Pb ±1σ 207Pb/235U ±1σ 206Pb/238U ±1σ 207Pb/206Pb ±1σ 207Pb/235U ±1σ 206Pb/238U ±1σ 20020-01 332.10 427.71 0.78 0.073 00 0.000 97 1.762 89 0.026 97 0.174 92 0.001 48 1 014 18 1 032 10 1 039 8 20020-02 1 213.61 964.01 1.26 0.065 39 0.001 02 1.143 21 0.022 26 0.126 58 0.001 17 787 25 774 11 768 7 20020-03 1 098.56 2 087.20 0.53 0.073 64 0.000 69 1.820 21 0.042 39 0.178 20 0.003 26 1 032 22 1 053 15 1 057 18 20020-04 258.06 2 279.32 0.11 0.071 61 0.000 65 1.620 16 0.023 20 0.163 78 0.001 49 975 15 978 9 978 8 20020-05 265.15 335.47 0.79 0.114 19 0.001 15 5.375 51 0.076 13 0.341 20 0.003 06 1 867 13 1 881 12 1 892 15 20020-06 2 526.81 3 793.33 0.67 0.076 60 0.000 88 1.336 90 0.024 20 0.126 47 0.001 78 1 111 17 862 11 768 10 20020-07 1 921.89 4 594.95 0.42 0.071 41 0.000 70 1.249 55 0.033 06 0.126 52 0.002 97 969 24 823 15 768 17 20020-08 990.66 1 309.82 0.76 0.157 49 0.001 83 9.887 60 0.130 64 0.454 90 0.003 70 2 429 12 2 424 12 2 417 16 20020-09 3 274.53 3 856.46 0.85 0.075 21 0.000 75 1.773 08 0.022 63 0.171 03 0.001 32 1 074 14 1 036 8 1 018 7 20020-10 281.17 291.25 0.97 0.069 47 0.002 05 1.209 18 0.035 65 0.126 66 0.001 51 913 41 805 16 769 9 20020-11 236.87 494.63 0.48 0.194 32 0.001 66 14.210 64 0.193 05 0.531 46 0.005 06 2 779 11 2 764 13 2 748 21 20020-12 559.39 987.38 0.57 0.156 83 0.001 95 9.461 85 0.120 01 0.438 92 0.004 89 2 422 10 2 384 12 2 346 22 20020-13 2 313.97 981.55 2.36 0.076 00 0.000 78 1.910 09 0.025 36 0.182 96 0.001 38 1 095 15 1 085 9 1 083 8 20020-14 1 013.84 516.34 1.96 0.071 84 0.001 14 1.642 52 0.030 27 0.166 45 0.002 00 981 19 987 12 993 11 20020-15 821.93 2 067.25 0.40 0.083 36 0.000 85 2.327 43 0.031 82 0.203 62 0.001 87 1 278 13 1 221 10 1 195 10 20020-16 481.61 1 346.66 0.36 0.073 34 0.001 31 1.671 15 0.022 82 0.161 44 0.001 25 1 023 16 998 9 965 7 20020-17 4 601.43 3 687.12 1.25 0.080 90 0.000 69 1.853 19 0.023 11 0.166 46 0.001 27 1 219 13 1 065 8 993 7 20020-18 1 274.70 2 095.80 0.61 0.074 00 0.000 68 1.534 40 0.022 77 0.150 53 0.001 55 1 041 15 944 9 904 9 20020-19 381.27 398.60 0.96 0.077 33 0.001 06 2.041 26 0.033 45 0.191 72 0.001 55 1 130 20 1 129 11 1 131 8 20020-20 387.97 300.11 1.29 0.078 03 0.001 30 1.729 86 0.034 04 0.160 73 0.001 58 1 148 24 1 020 13 961 9 20020-21 6 175.99 3 514.19 1.76 0.074 97 0.000 92 1.310 99 0.020 51 0.126 85 0.001 46 1 068 15 851 9 770 8 20020-22 140.41 275.20 0.51 0.082 14 0.001 40 2.494 45 0.053 64 0.220 68 0.002 96 1 249 22 1 270 16 1 285 16 20020-23 336.39 612.38 0.55 0.066 54 0.001 00 1.543 99 0.024 78 0.168 83 0.001 60 824 18 948 10 1 006 9 20020-24 619.07 2 432.08 0.25 0.083 32 0.000 90 2.436 07 0.057 46 0.211 39 0.003 57 1 277 22 1 253 17 1 236 19 20020-25 2 434.84 6 471.75 0.38 0.072 91 0.001 26 1.269 53 0.028 60 0.126 75 0.001 56 1 011 26 832 13 769 9 20020-26 3 481.25 7 347.11 0.47 0.060 37 0.000 70 1.051 34 0.020 61 0.126 82 0.001 74 617 21 730 10 770 10 20020-27 159.94 238.88 0.67 0.069 04 0.003 19 2.107 38 0.062 80 0.195 08 0.004 82 900 28 1 151 21 1 149 26
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表 4 罗家山辉长岩的单斜辉石‒熔体平衡温度、压力和深度
Table 4. Clinopyroxene-melt equilibrium temperatures, pressures and depth of Luojiashan gabbro
Spot No. T(℃) P(GPa) D(km) Spot No. T(℃) P(GPa) D(km) LJS-1 1 284 1.53 50.49 LJS-24 1 291 2.22 73.26 LJS-2 1 286 1.78 58.74 LJS-25 1 286 2.13 70.29 LJS-3 1 285 1.77 58.41 LJS-26 1 286 2.11 69.63 LJS-4 1 285 1.74 57.42 LJS-27 1 289 2.03 66.99 LJS-5 1 288 2.10 69.3 LJS-28 1 284 1.93 63.69 LJS-6 1 288 2.23 73.59 LJS-29 1 289 2.08 68.64 LJS-7 1 291 2.30 75.90 LJS-30 1 288 2.12 69.96 LJS-8 1 289 2.17 71.61 LJS-31 1 288 2.09 68.97 LJS-9 1 288 2.21 72.93 LJS-32 1 287 2.06 67.98 LJS-10 1 289 2.20 72.60 LJS-33 1 288 2.18 71.94 LJS-11 1 290 2.26 74.58 LJS-34 1 288 2.19 72.27 LJS-12 1 288 2.14 70.62 LJS-35 1 286 2.05 67.65 LJS-13 1 292 2.28 75.24 LJS-36 1 286 1.85 61.05 LJS-14 1 292 2.37 78.21 LJS-37 1 285 1.90 62.70 LJS-15 1 287 1.76 58.08 LJS-38 1 286 1.84 60.72 LJS-16 1 289 2.12 69.96 LJS-39 1 285 1.95 64.35 LJS-17 1 287 1.92 63.36 LJS-40 1 282 1.76 58.08 LJS-18 1 286 1.94 64.02 LJS-41 1 286 1.83 60.39 LJS-19 1 287 1.91 63.03 LJS-42 1 287 1.96 64.68 LJS-20 1 285 1.75 57.75 LJS-43 1 287 2.11 69.63 LJS-21 1 286 1.97 65.01 LJS-44 1 285 1.84 60.72 LJS-22 1 290 2.27 74.91 LJS-45 1 287 1.93 63.69 注：1 GPa对应按33 km计算.
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